Xfa Spec 2 6
Xfa Spec 2 6
Xfa Spec 2 6
NOTICE: All information contained herein is the property of Adobe Systems Incorporated. Any references to company names in the specifications are for demonstration purposes only and are not intended to refer to any actual organization. Adobe is a registered trademark of Adobe Systems Incorporated in the United States and/or other countries. Microsoft, Windows, and ActiveX are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. Mac OS is a trademark of Apple Computer, Inc., registered in the United States and other countries. JavaScript is a registered trademark of Netscape Communications Corporation. Unicode is a registered trademark of Unicode, Inc. SAP is the trademark or registered trademark of SAP AG in Germany and in several other countries. ZPL II and ZPL are registered trademarks of ZIH Corp. All other trademarks are the property of their respective owners. This publication and the information herein are furnished AS IS, are furnished for informational use only, are subject to change without notice, and should not be construed as a commitment byAdobe Systems Incorporated. Adobe Systems Incorporated assumes no responsibility or liability for any errors or inaccuracies that may appear in the informational content contained in this guide, makes no warranty of any kind (express, implied, or statutory) with respect to this publication, and expressly disclaims any and all warranties of merchantability, fitness for particular purposes, and noninfringement of third-party rights. This limited right of use does not include the right to copy other copyrighted material from Adobe, or the software in any of Adobes products that use the Portable Document Format, in whole or in part, nor does it include the right to use any Adobe patents, except as may be permitted by an official Adobe Patent Clarification Notice (see [Adobe-Patent-Notice]in the Bibliography). Adobe Systems Incorporated, 345 Park Avenue, San Jose, California 95110, USA. Notice to U.S. Government End Users. The Software and Documentation are Commercial Items, as that term is defined at 48 C.F.R. 2.101, consisting of Commercial Computer Software and Commercial Computer Software Documentation, as such terms are used in 48 C.F.R. 12.212 or 48 C.F.R. 227.7202, as applicable. Consistent with 48 C.F.R. 12.212 or 48 C.F.R. 227.7202-1 through 227.7202-4, as applicable, the Commercial Computer Software and Commercial Computer Software Documentation are being licensed to U.S. Government end users (a) only as Commercial Items and (b) with only those rights as are granted to all other end users pursuant to the terms and conditions herein. Unpublished-rights reserved under the copyright laws of the United States. Adobe Systems Incorporated, 345 Park Avenue, San Jose, CA 95110-2704, USA. For U.S. Government End Users, Adobe agrees to comply with all applicable equal opportunity laws including, if appropriate, the provisions of Executive Order 11246, as amended, Section 402 of the Vietnam Era Veterans Readjustment Assistance Act of 1974 (38 USC 4212), and Section 503 of the Rehabilitation Act of 1973, as amended, and the regulations at 41 CFR Parts 60-1 through 60-60, 60-250, and 60-741. The affirmative action clause and regulations contained in the preceding sentence shall be incorporated by reference.
Contents
Preface ....................................................................................................................................... viii
Intellectual Property................................................................................................................................................................... viii Document Contents..................................................................................................................................................................... ix Intended Audience ....................................................................................................................................................................... ix Perspective Used in Describing Processing Guidelines................................................................................................... ix Associated Schemas.......................................................................................................................................................................x Related Documentation................................................................................................................................................................x Whats New........................................................................................................................................................................................x Conventions ......................................................................................................................................................................................x
Part 1:
1
Exchanging Data Between an External Application and a Basic XFA Form ........................109
Creating, Updating, and Unloading a Basic XFA Data DOM...................................................................................... 109 Localization and Canonicalization ...................................................................................................................................... 139 Loading a Template to Produce the XFA Template DOM .......................................................................................... 158 Basic Data Binding to Produce the XFA Form DOM ..................................................................................................... 159 Form Processing ........................................................................................................................................................................ 191 Data Output................................................................................................................................................................................. 191
Representation of Rich Text Across XML and XFA DOMs ........................................................................................... 193 Rich Text That Contains External Objects......................................................................................................................... 197 Displaying and Printing Rich Text ....................................................................................................................................... 198
11 Scripting ...................................................................................................................................358
Purpose of Scripting................................................................................................................................................................. 358 Specifying Where to Execute a Script ................................................................................................................................ 359 Selecting a Script Language .................................................................................................................................................. 359 Setting Up a Scripting Environment................................................................................................................................... 361 The Relationship Between Scripts and Form Objects .................................................................................................. 362 Exception Handling ................................................................................................................................................................. 363 Picture Clauses and Localization ......................................................................................................................................... 363 Unicode Support ....................................................................................................................................................................... 364
Invoking ADO APIs Through the Source Set DOM ....................................................................................................... 408 Submitting Data and Other Form Content via E-mail.................................................................................................. 414 Null handling .............................................................................................................................................................................. 416
Part 2:
Part 3:
25 FormCalc Specification............................................................................................................902
Grammar and Syntax ............................................................................................................................................................... 902 FormCalc Support for Locale................................................................................................................................................. 929 Arithmetic Built-in Functions ................................................................................................................................................ 933 Date And Time Built-in Functions ....................................................................................................................................... 943 Financial Built-in Functions ................................................................................................................................................... 957 Logical Built-in Functions....................................................................................................................................................... 967 String Built-in Functions ......................................................................................................................................................... 972 URL Built-in Functions ............................................................................................................................................................. 995 Miscellaneous Built-in Functions......................................................................................................................................... 999
Part 4:
Adobe Implementation
28 Adobe Implementation.........................................................................................................1059
Non-conformance...................................................................................................................................................................1060 Implementation-specific behavior....................................................................................................................................1062 Processing instruction for backward compatability...................................................................................................1071
Part 5:
A B C
Algorithms for Determining Coordinates Relative to the Page.........................................1188 Layout Objects .......................................................................................................................1189 AXTE Line Positioning ...........................................................................................................1199
Introduction ..............................................................................................................................................................................1199 Discussion ..................................................................................................................................................................................1204 Detailed Algorithms ...............................................................................................................................................................1208
Schemas..................................................................................................................................1228
About the Schemas ................................................................................................................................................................1228
Bibliography ..........................................................................................................................1231
General References.................................................................................................................................................................1231 Fonts and Character Encoding References....................................................................................................................1236 Barcode References ................................................................................................................................................................1237
Glossary ..................................................................................................................................1240
Preface
This specification is a reference for XML Forms Architecture (XFA). It is intended for use in developing applications that create XFA templates (which represent forms awaiting fill-in) and applications that process XFA forms. Such XFA processing applications may be simple stand-alone form-fill in applications, or they may be a set of client-server applications that work together to fill-in and process a form.
Intellectual Property
The general idea of using templates and processing rules to build interactive forms is in the public domain. Anyone is free to devise templates using unique structures and apply customized processing rules to them. However, Adobe Systems Incorporated owns the copyright for the particular template-based grammar and processing rules constituting the XFA Specification, the written specification for the Adobe XML Architecture. Thus, these elements of the XFA Specification and Adobe XML Architecture may not be copied without Adobe's permission. Adobe will enforce its copyrights. Adobes intention is to maintain the integrity of the Adobe XML Architecture standard. This enables the public to distinguish between the Adobe XML Architecture and other interchange formats for electronic documents, transactions and information. However, Adobe desires to promote the use of the Adobe XML Architecture for form-related interactions among diverse products and applications. Accordingly, Adobe gives anyone copyright permission to use the Adobe XML Architecture, subject to the conditions stated below, to:
Prepare files whose content conforms to the Adobe XML Architecture Write drivers and applications that produce output represented in the Adobe XML Architecture Write software that accepts input in the form of the Adobe XML Architecture specifications and displays, prints, or otherwise interprets the contents Copy Adobes copyrighted grammar, as well as the example code to the extent necessary to use the Adobe XML Architecture for the purposes above
Anyone who uses the copyrighted grammar, as stated above, must include the appropriate copyright notice.
This limited right to use the example code in this document does not include the right to use other intellectual property from Adobe, or the software in any of Adobes products that use the Adobe XML Architecture, in whole or in part, nor does it include the right to use any Adobe patents, except as may be permitted by an official Adobe Patent Clarification Notice (see [Adobe-Patent-Notice] in the Bibliography). Adobe, the Adobe logo, Acrobat, LiveCycle, LiveCycle Designer and PostScript are either trademarks or registered trademarks of Adobe Systems Incorporated in the United States and/or other countries. Nothing in this document is intended to grant you any right to use these trademarks for any purpose.
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Document Contents
This reference is a complete guide to XFA. It describes the various XML grammars that comprise XFA and it explains the rules for processing those grammars in conjunction with data supplied from sources outside the XFA form. This reference is presented in the following major parts:
Part 1: XFA Processing Guidelines. This part contains narrative chapters that introduce XFA and provide rules for processing XFA in conjunction with data received from an outside source. These rules provide a standard interpretation of XFA expressions and data, which helps to ensure that XFA-related behavior in XFA processing applications is equivalent. More importantly it helps to ensure that XFA processing applications that contribute to sequential processing of XFA documents do not have mis-matched expectations. Part 2: XFA Grammar Specifications. This part provides a set of references that describe the elements and attributes of each of the grammars that comprise XFA. Each chapter describes one of these grammars. Part 3: Other XFA-Related References. Each chapter in this part contains reference material for non-XML expressions used with XFA. Although the standards described in these chapters are an important part of XFA processing, they are not considered XFA grammars. Part 5: Appendices, Bibliography, Glossary and Index. This part contains appendices that provide adjunct information referenced by the narrative chapters in Part 1. It also contains a bibliography, a glossary and an index.
Intended Audience
You should read this specification if you are developing a template designing application or if you are developing an XFA processing application. This is especially true if either type of application is intended to work with the Adobe XFA-compatible products, such as Acrobat and LiveCycle Designer. Non-technical readers may benefit from reading the chapter, Introduction to XML Forms Architecture (XFA) on page 15.
Associated Schemas
Many of the XFA grammars described in this specification are contained in an attachment carried within this PDF file. See Schemas on page 1228 for instructions concerning how to extract and use those schemas. Although these schemas can be used to validate the XML syntax of XFA documents, such validation is not normally part of XFA form processing. Most people filling out a form cannot resolve errors detected during such validation. It is expected that XFA documents will be generated by software and will be correct by design. Hence, these schemas are more likely to be used in development. XML validation differs from XFA form validation, which validates the content entered into the form. XFA form validation is described in Validations on page 334. XFA also supports the use of XML data documents which are or may be separate from the form itself. A simple schema language based on annotated sample data is defined for this purpose in Data Description Specification on page 845. This facility is not used for validation as such; data which does not conform to the data description is simply ignored. However the data description does control the merging of data into the form and the subsequent generation of a new XML data document. See Exchanging Data Between an External Application and a Basic XFA Form on page 109.
Related Documentation
This document replaces the previous version of this specification. This version and previous versions back to 2.0 are available at http://adobe.com/go/xfa_specifications.
Whats New
A complete list of enhancements in XFA versions 2.0 through 2.6, labelled by version, is given in the appendix History of Changes in This Specification on page 1211. Caution: In XFA 2.6 some previously endorsed syntax is still legal, but deprecated. It will be removed in a future version of the specification. See Deprecated XFA Features on page 1226.
Conventions
This document uses notational and graphical conventions as a shorthand for conveying more complex information.
Notational Conventions
This document uses typefaces and character sequences to indicate the roles and connotations of expressions.
Typefaces
The following table describes typeface usage in this document:
Typeface
monospaced
Named XML and XFA objects that appear in a paragraph: A pageSet element represents an ordered set of display surfaces. Note: Named XFA objects in a paragraph are frequently not tagged with the monospaced typeface because their identity as such is assumed to be understood. italics Definition of a term: Fixed data (boilerplate) includes any text, lines, that remain unchanged throughout the life of the form. Document title: PDF Reference Hypertext link Hypertext links to other parts of this document: , as described in Conventions on page x. Hypertext links to references in the Bibliography on page 1231: , as described in the PDF Reference [PDF]. Hypertext links to element descriptions that appear in one of this documents references: For more information see the field syntax description. Hypertext links to URLs: Those notations are available at http://www.unicode.org/uni2book/Preface.pdf.
where node-type represents the general type of the node and name represents the value of the name property of the node.
If the node has a value property and the value is of interest, it is shown as:
[node-type (name) = "node-value"]
where node-value represents the value of the value property. If properties other than name and value are of interest, they are expressed in the following form:
[node-type (name) property-name="property-value"]
where property-name represents the name of any one of the node's properties, and property-value represents the value of the corresponding property. Indenting is used to show descent of one node from another, representing containment of the object represented by the child node within the object represented by the parent node. For example, the following shows the representation within a DOM of a subform named Cover enclosing a field named FaxNo. The field has interesting properties value, w, and h.
[subform (Cover)] [field (FaxNo) = "555-1212" w="1.5in" h="0.17in"]
Tree Notation on page 117 illustrates how this notation is used to describe XFA Data DOM.
Optional Terms
Within syntax definitions square brackets surround optional terms. Nesting of square brackets represents a term (inside the inner brackets) that is allowed only if another term (inside the outer brackets) is present. For example, consider the following:
HH[:MM[:SS[.FFF]]][z]
This syntax definition states that the HH term is mandatory. The :MM term is optional and does not require the presence of any other term. The :SS term is optional but may only be included if the :MM term is included. Similarly the .FFF term is optional but may only be included if the :SS term is included. Finally, the z term is optional and does not require the presence of any other term. The meaning of the individual terms varies from context to context and is explained in the text where the syntax definition appears. Caution: Square brackets only have this meaning in syntax definitions. When they appear inside a scripting example or an XFA-SOM expression they represent literal square-bracket characters in the script or XFA-SOM expression. Other types of brackets or braces including ( and ), { and }, always represent literally the character which they depict.
Graphical Conventions
Layout Drawing Conventions
Some drawings in this specification portray displayable objects, such as blocks of text, positioned upon a page. Such drawings use certain conventions which are illustrated at right. Each such drawing represents a page or a portion of a page resulting from a layout operation. Objects shown in 40% gray in the drawing would be actually visible on the page when it was rendered. Objects shown in black in the drawing give additional information that would not be visible. In addition to the color difference, visible text is shown in a serif typeface, whereas other text is shown in a san-serif typeface. Object boundaries are shown with dashed or solid black rectangles. Dashed lines show the boundaries of predefined physical layout regions on the page. Solid lines show the boundaries of the nominal extent for content that is displayed upon the page. Neither of these boundaries would be visible on the page. Some objects may optionally have visible borders. The borders of an object may coincide with the boundaries of the objects nominal extent, but they are not required to. To avoid confusion borders are not shown unless relevant, and where they are shown they are in 40% gray and offset from the objects boundaries.
label for contentArea This is displayable text. boundaries of layout-content
boundary of a contentArea
dimension line
Some drawings show an object with a solid outline and a dot-dashed line just inside, and parallel to, the solid outline. This represents a place where a single original object has been split into two or more fragments during the layout process. Dot-dashed lines are also used for arbitrary lines that have a meaning specific to the drawing. Dimension lines and extension lines are solid.
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Key Features
XFA forms provide a wide range of capabilities.
Workflow: Data presentation, data capture and data editing, application front-end, printing. Dynamic interactions: From interactive, human edited forms with dynamic calculations, validations and other events to server-generated machine-filled forms. Dynamic layout: Forms can automatically rearrange themselves to accommodate the data supplied by a user or by an external data source, such as a database server. Scalability: Single-page static forms, dynamic document assemblies based on data content, large production runs containing hundreds of thousands of transactions.
XFA is similar to PDF interactive forms introduced in PDF 1.2, which is also known as AcroForm, with the following differences:
XFA can be used in XML-based workflows. XFA separates data from the XFA template, which allows greater flexibility in the structure of the data supported and which allows data to be packaged separately from the form. XFA can specify dynamically-growing forms. XFA can specify Web interactions, such as HTTP and Web Services (WSDL). Such interactions can be used to submit data to a server or to request a server perform a calculation and return the result. XFA works with other XML grammars.
Appearance of the form, including fields, layout and graphics Default data to be used for fields Types of data expected, including checks on the validity of provided data Scripts associated with specific events, such as the user clicking a particular field
15
XFA Specification Chapter 1, Introduction to XML Forms Architecture (XFA) Scenarios for Using a Form Described by XFA 16
Form Appearance
After opening a template, a user sees an interactive form that represents the layout, graphics, and fields defined in the XFA template. The interactive form presents data associated with fields. Initially, the only data in the form are default values defined in the template. As the user provides data in fields, the default values are replaced with user-provided values. Date, time, and numeric values are displayed in a manner appropriate for the users locale. The user interacts with the form, supplying values and selecting options. The users input and selections are reflected in the form. As the user enters data, parts of the form or fields may automatically grow to accommodate data entered by the user or a machine-generated source.
Calculations. Entering data into a field may cause the values of other fields to be recalculated. Data checks. Entering data into a field may initiate a series of validity checks on the entered value. Web Services (WSDL) interactions. Submission of data to a server.
Visual clues. Fields may display default values that provide hints about the desired input values. In addition to fields, XFA template may aid the user, by providing radio buttons, check boxes, and choice lists. Accelerator keys. An XFA template may include accelerator keys that allow users to move from field to field, by typing in a control sequence in combination with a field-specific character. Traversal order. An XFA template may be defined with a traversal order, which allows the user to tab from one field to the next. Speech. An XFA template supports speech enunciation, by allowing a form to specify the order in which text descriptions associated with a field should be spoken. Visual aids. XFA template may specify text displayed when the tooltip hovers over a field or a subform.
XFA Specification Chapter 1, Introduction to XML Forms Architecture (XFA) Family of XFA Grammars 17
Printing Forms
An XFA processing application can be requested to print a blank form or one that is filled out. The data for the filled-out form can come from a database, from an XML data file generated by an application, or from a previous interactive session or sessions in which data was manually entered. During this process, the form may be printed with print view which differs from the view seen by users in interactive sessions. For example the print view might have the following differences:
Signature fields appear as underlines for hand-signing rather than as widgets for digital signing. Some of the data on the form is printed as barcodes rather than text. Summary data is computed and printed on the first page of the form.
In addition there may be different print views for duplex (two-sided) and simplex (one-sided) printers. XFA can operate with a wide variety of printers including label printers as well as ordinary sheet printers.
dataDescription
XFA Specification Chapter 1, Introduction to XML Forms Architecture (XFA) Family of XFA Grammars 18
Description Other datasets are defined as needed for special purposes. For example when a partially-filled form is saved a special dataset may be created to hold information indicating that calculations have been manually overridden in certain fields. Controls the appearance and behavior of the form. Page background and certification information described by a PDF object. Although PDF is not an XML format, it is represented as a stream within an XML object. If such a form is displayed or printed, the template objects are drawn on top of the PDF content. The XFA grammar defines other grammars to define such information as Web connections and localization information. Application-defined information may be included along with the XFA-defined information. This can be expressed as any valid XML as long as the outermost element does not use an XFA namespace.
template PDF
XFA
datasets
template
XML
data
XFA Specification Chapter 1, Introduction to XML Forms Architecture (XFA) Family of XFA Grammars 19
Instead of XFA containing PDF, PDF may contain XFA. The PDF content includes dictionary entries that signify the presence of XFA and identify which version of this specification it adheres to. Note: When Acrobat opens such a document, it invokes the XFA plug-in, which supports XFA grammars.
Content
XFA
datasets
template
XML
data
XFA Specification Major Components of an XFA Form: XFA Template and Data
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PDF Document
An XDP may be included as an object in a PDF document, mirroring the structure illustrated on page 19. Any of the form packets may be included within the XDP. The XFA and PDF standards are related. The ISO/DIS 32000 standard [ISO-32000-1] is an ISO-approved subset of the PDF 1.7 syntax [PDF]. XFA 2.6 is not part of ISO/DIS 32000. Instead it is part of a vendor-specific extension called Adobe Extensions Level 1. Adobe recommends marking the Adobe Extensions Level in the PDF using the syntax described in Marking the Adobe Extensions Level in PDF (proposed) on page 1063.
XFA Specification Major Components of an XFA Form: XFA Template and Data
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XFA distinguishes between template and data. The template defines presentation, calculations and interaction rules. Data is customer's application data plus whatever other data sets may be carried with the form. Though they are often packaged together, template and data are separate entities.
XFA Template
XFA template is the XFA subelement that describes the appearance and interactive characteristics of an interactive form. It was designed from the ground up to be an XML-based template language. XFA follows a declarative model in which elements in an XFA template describe the components of the form. That is, an XFA template does not need to include any procedures. However scripts may be included to provide enhanced or custom functionality.
Form what a person filling out a form works with, which is given life by an XFA processing application such as Acrobat. Template what the form designer creates, which represents the potential for a form. A template is a collection of related subforms and processing rules.
XFA Specification Major Components of an XFA Form: XFA Template and Data
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This is an example of a form. To an end user (form consumer), it represents something to be filled out, by entering data into the white spaces. This user makes little or no distinction between a blank form and a filled one, other than the presence of data. In fact, the absence of data in a particular data entry element can be as meaningful as the presence of data. In contrast, a form designer views it as a vehicle for capturing, rendering and manipulating data. As such, the designer is concerned with issues of layout, interaction and processing. A template is a specification of capture, rendering and manipulation rules that will apply to all form instances created from that template. When selecting a form to be filled interactively, the user perceives that s/he is selecting a blank form. The user is performing an operation similar to starting a new document in a word processor, by first selecting a template. The user directs an XFA processing application to use this template to construct a form, which at first appears blank. As the data is entered the association between the template and the entered data is captured in an entity known as the Form DOM. Suppose the user chooses to break off filling the form before it is complete. The complete state of the form is saved by the XFA processing application as a local file containing an XDP. This state includes the template, the Form DOM, data entered so far and a record of calculations that the user has chosen to override. When the user restarts the XFA processing application it reloads the complete form state and the user is able to resume just where he or she left off. When the user has finished filling out the form he or she clicks on a submit button. The submit button is defined within the template and its characteristics were determined by the form creator. The submit button may cause the data to be submitted to a server on the web via HTTP or SOAP, or to a local database. Whichever of these submission methods is used, usually only the user data is submitted. However the form creator may direct the application to submit the the whole form or some subset of it.
XFA Specification Major Components of an XFA Form: XFA Template and Data
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exclusion group: Container of multiple fields. Exclusion groups represent a radio-button grouping. subform: Container of other containers. The subforms that appear in a form may be pre-determined (as in a static form) or may expand to accommodate the data bound to it (as in a dynamic form). page area or area: An abstract representation of the physical page or other area in which other containers are placed. The area does not change in size, but if its capacity is exceeded, a new area is created.
Laying Out the Containers (and Their Data) to Create the Forms Appearance
Each subform and area is a little document in and of itself. Subforms are assembled together in order to create the final document. Subforms also support repeating, optional and conditional data groups. These allow the construction of a form which responds to structure in the bound data. For example the form can automatically add more pages to accomodate all of the supplied data records. When the XFA processing application creates the interactive form, it reconciles the template and the data by adding enough copies of the appropriate subform to accommodate the data. Allowing the data to drive the number of subforms used in a form has several advantages. It is less error-prone than predefining multiple instances of the subform, and the template designer need not guess at a maximum possible number to handle all anticipated cases. In addition, because XFA Template is a declarative language, there is no need to write script to create such instances when the content is bound. An important feature of XFA is that a template can stand alone. It doesn't need data to bring it to life. A template without data is the equivalent of a blank form, ready for filling.
If the instances of those field names are in other subforms When there are multiple instances of those field names in the same subform
XFA Specification Data Binding: Making the Connection Between XFA Template and Data
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Because of the declarative nature of XFA Template, the largest use of scripting is for field calculations. A field with such a script typically is protected against data entry, and instead gets its value from an expression involving other fields. A field's calculation automatically fires whenever any field on which it depends changes (those fields may, in turn, also have calculated values dependent on other fields, and so on). Similar to calculation, a field can have a validation script applied that validates the field's value, possibly against built-in rules, other field values or database look-ups. Validations typically fire before significant user-initiated events, such as saving the data. Finally, scripts can be assigned to user actions, for example, such as when the user enters data and when the user clicks on a field. Scripts can also be activated by events that occur behind the scenes, such as assembling data to send to a web service.
Data
Typically, XFA variable content is the customer's XML data, matching the customer's schema. Data could also come from a database, an HTTP POST response, a web service interaction, default data supplied by the template or other source. Often, form data elements are plain text, but may also include rich text and graphics. XFA defines a data value to be an XFA name/value pair, where the value is plain or rich text, or a graphic. Data values may contain nested data values. An XFA name is a string suitable for identifying an object. A valid XFA name must be a valid XML name, as defined in [XML], with the additional restriction that it must not contain a colon ( : ) character. XFA also defines a data group: the provider of structure in the data. Data groups may contain data values and other data groups. As stated above, the data is typically structured according to the customer's schema; data values and data groups are represented as abstract structures, inferred from the customer's data. The abstract structure helps the XFA processing application create an XFA form that reflects the structure and content of the data. This process (called data binding) is described in the next section. It is important to note that XFA doesn't have to treat the data as a read-only source of variable content. Many forms-based workflows involve round-tripping: load the data into the template, edit or augment it, and save out the modified data. XFA can be instructed to remain true to the data's original structure when saving. When data values and groups are logically moved to match the structure of the template, the form designer has an option as to whether saving the data will or will not reflect those moves. While data is often authored via legacy applications or database queries, it can also be authored through an interactive form filling applications, such as Acrobat version 6 and greater.
Data Binding: Making the Connection Between XFA Template and Data
When an XFA processing application introduces data to an XFA form, it associates each piece of information to a container, such as a field or a subform. This process is called data binding. Generally, XFA data binding attempts to map like-named data values to template fields and data groups to template subforms. Data and template structures often don't match. XFA processing defines default binding rules to handle such mismatches. Alternatively, the template designer may choose to provide data binding rules in the template definition. If those alternative do not provide desired results, the template designer may change the structure and/or content of the XML data, by specifying XSLT scripts the XFA
XFA Specification Chapter 1, Introduction to XML Forms Architecture (XFA) Lifecycle of an XFA Form 25
processing application uses to pre-process and post-process data. See also Basic Data Binding to Produce the XFA Form DOM on page 159 and Dealing with Data in Different XML Formats on page 434. Data binding alters neither the template nor the data. That is, data binding is internal to the XFA processing application. Unbound data values and groups (those that don't have matches in the template structure) are preserved and won't be lost or moved if the data is saved. The binding operation can create forms with repeated subforms, in which multiple run-time instances of the subform are created to accommodate the multiple instances present in the data. A form with such a capability is called a dynamic form. A form without such a capability (that is, with the capability switched off ) is called a static form. When using the XFAF architecture, in which fixed content is expressed as PDF, the form must be static. In addition, XFA data binding is designed to handle like-named data values, as well as like-named data groups. It is common in forms processing for there to be multiple data values present with the same name. For example, invoice data generated from a database query could easily have multiple item, description, unit price and quantity fields in a relatively flat structure. In addition, there may be repeating data groups. XFA defines default binding rules to ensure that these map intuitively to like-named fields or subforms in the template. The basic rules for dealing with multiple instances of the same name are:
The relative order of sibling items that have different names is not important, may be ignored and does not need to be maintained; and The relative order of sibling items that have the same name is important, must be respected and maintained
For more information, see Basic Data Binding to Produce the XFA Form DOM on page 159.
Using a graphical layout tool, such as Adobe LiveCycle Designer Automatically by software, a capability provided by SAP Smart Forms conversion Hand-edit XFA Template files
In a template designing application with a graphic interface, a template designer can start with a blank canvas and place objects, or the author can start with a schema, for example, XML-Schema [XML-Schema], data source or data file. When starting with a schema, the designer can select portions or all of the schema tree and place them on the template canvas, and the design tool will create subform/field structure, with properly-typed fields, template-defined bindings. layout constraints, and processing rules.
XFA Specification Chapter 1, Introduction to XML Forms Architecture (XFA) Lifecycle of an XFA Form 26
Committing a Form
After completing a form, the user is ready to submit the form. That is, the user has supplied all information required by the form and repaired any errors reported by the form. The form is ready to be released for further processing. XFA forms may use digital signatures. The user typically clicks a button to sign the form. The digital signature may include only data, in which case it provides non-repudiable proof that the user did enter that data. Alternately the signature may be applied to other parts of the document to prove that they have not been tampered with since the signature was applied.
XFA Specification Chapter 1, Introduction to XML Forms Architecture (XFA) Static versus Dynamic Forms 27
Typically, the template supplies the form with a submit button. The button has properties which control the submit operation. In addition the button may specify a validation test and/or a script that must be run before the data is submitted. Typically, if the validation or script fails, the user is asked to make corrections and resubmit the form. Once the data has passed all required validation it is submitted across the network. When the processing application has successfully submitted the form content, the form is said to be committed. That is, the form has entered the next stage of processing. For example when a customer of an online store commits the purchase form, the store then charges the purchase to the customer's credit card and ships the merchandise. XFA also supports sending the filled form as an e-mail attachment or via physical conveyance of a printed copy. These methods do not require a submit button. Typically the filled form can be saved as a file or sent to a printer via the user interface of the XFA processing application.
XFA Specification Chapter 1, Introduction to XML Forms Architecture (XFA) Static versus Dynamic Forms 28
rendering does not have the exquisite control over appearance that PDF yields, for example it does not support kerning. Furthermore it uses more CPU time than a static XFAF form. The next few chapters discuss matters that apply to all XFA forms whether they are static or dynamic. Template Features for Designing Static Forms on page 30 discusses the subset of template features used by XFAF forms. These core features are also fundamental to dynamic forms. Object Models in XFA on page 63 discusses the ways in which the template, data, and other objects are represented inside an XFA processor and the ways in which they interact. Exchanging Data Between an External Application and a Basic XFA Form on page 109 discusses the way in which data in an external document is parsed and loaded into a static form and how it is written out. Representing and Processing Rich Text on page 192 describes the syntax used for rich text. Often forms have repeated sections or repeated components, for example the same logo may appear on multiple pages of a form. In addition different forms may have sections or components in common. Template Features for Designing Forms with Repeating Sections on page 199 describes template features which can be used to reuse declarations within a form or across forms. The next set of chapters discuss matters that apply only to dynamic forms. Template Features for Designing Dynamic Forms on page 221 describes additional template features needed by dynamic forms. Forms may be designed with containers that stretch or shrink to accomodate varying amounts of data within individual fields. Containers of this sort are called growable containers. Layout for Growable Objects on page 242explains how the content of forms with a fixed data structure but with growable containers is laid out. Forms may also adjust themselves to data which varies in structure. Dynamic Forms on page 291 describes the operation of data-driven forms in which subforms are included or excluded depending upon the data. Layout for Dynamic Forms on page 315 describes the differences between layout for forms with growable containers but fixed data structure and layout for forms with variable data structure. The remaining chapters in Part 1discuss specialized features of XFA. These can be used in both static and dynamic forms. Automation Objects on page 327 describes the ways in which calculations, validations, and a variety of events are linked into other objects on the form and how they interact. Scripting on page 358 describes the scripting facilites. Forms That Initiate Interactions with Servers on page 386 describes the ways in which forms can interact with servers across the network via either HTTP or WSDL/SOAP. User Experience on page 417 describes the assumptions that XFA makes about the functioning of the user interface and documents the facilities for enhanced accessibility. XFA forms can deal directly with almost all XML data, but occasionally it is desireable for the form to see a reorganized view of the data. Dealing with Data in Different XML Formats on page 434 describes the facilites built into XFA for reorganizing data while loading it, and in most cases transforming it back to the original organization when it is written out.
XFA Specification Chapter 1, Introduction to XML Forms Architecture (XFA) Static versus Dynamic Forms 29
Security and Reliability on page 471 deals with issues of authentication, trust, and non-repudiability as well as protection against attack.
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XFA Specification Chapter 2, Template Features for Designing Static Forms Form Structural Building Blocks 31
Container
Container
Container
UI
Caption
Content element is a type of XFA template element that houses datatyped pcdata (text) or images. Such pcdata or graphic elements may be defined as default data in the content element. See Content Elements on page 33. UI element is a type of XFA template element that describes how data should be presented to a form user. See User Interface on page 34. Caption element provides static text that labels a container.
Note: This specification allows for captions on many different containers, but the Acrobat implementation of XFAF only supports the visual presentation of captions on button and barcode fields. However captions can still be used to supply text for an assist element. Also, this limitation does not apply to dynamic forms or old-style non-XFAF static forms.
Container Elements
The term container element refers to an element that houses content and the form-related aspects of dealing with its content, such as the following:
Variable content or the potential for variable content. Variable content includes text and images. Caption for the container. Formatting and appearance such as a border around the container, text formatting and localization, and barcode formatting. Accessibility, such as traversal order between containers and speech order for the text associated with a container. User interaction, as described in User Interface. Calculations that consider the content of this and other containers. Validations used to qualify data associated with the content element. Other interactions, such as form or keyboard events and web service interactions.
XFA Specification Chapter 2, Template Features for Designing Static Forms Form Structural Building Blocks 32
Interface on page 34) and support for a broad variety of content data-typing (Content Types on page 37). The following is an example of a field element that produces a data-entry region capable of accepting textual input. The field is positioned at an (x,y) coordinate of (0,0) and has a width of 1 inch and a height of 12 points.
Example 2.1
For more information, please see the syntax description of the field element.
Exclusion Group
An exclusion group is a non-geographical grouping of fields, where one of the fields provides the value for the exclusion group. The fields in an exclusion group exhibit mutual exclusivity commonly associated within radio-buttons or ballot/check-boxes, as shown at right. Only one of the objects may have a value or be selected by the user. The value of an exclusion group is the value of the selected or on field. (Example 2.2) The fields contained in exclusion groups should be restricted to those containing checkButton widgets. The behavior of exclusion groups containing other types of fields is undefined. Exclusion groups may be defined with or without a default value. The default value for an exclusion group is the default value provided by one of the fields in the group. An error exists if more than one field within an exclusion group provides a default value.
Example 2.2
<exclGroup > <field > <ui> <checkButton shape="round" /> </ui> <items> <integer>1</integer> </items> <value> <text>1</text> </value> </field> <field > <ui> <checkButton shape="round" /> </ui> <items> <integer>2</integer> </items> </field> </exclGroup>
For more information, please see the syntax description of the exclGroup element.
XFA Specification Chapter 2, Template Features for Designing Static Forms Form Structural Building Blocks 33
Example 2.3
<template xmlns="http://www.xfa.org/schema/xfa-template/2.6/"> <subform name="Device" x="2" y="3"> <field name="ModelNo" x="0" y="0" w="1in" h="12pt"/> <field name="SerialNo" x="0" y="16pt" w="1in" h="12pt"/> </subform> </template>
Subform
Common paper forms often contain sections and subsections that are easily distinguished from one another. For example, there are three distinct sections for header, detail and summary information in the diagram A simple XFA form on page 21. The form is really a collection of these sections and subsections, each of which XFA refers to as a subform. Some of the features offered by subform elements include:
Management of scope of element names in scripting operations, as described in Scripting Object Model on page 74 Validation of the content of the subform as a whole, as described in Validations on page 334 Hierarchical data binding, as described in Basic Data Binding to Produce the XFA Form DOM on page 159
The subform element provides the level of granularity that a form object library would use. A form object library is a tool used by form designers to store commonly used groupings of form container objects, for example, company letterhead. The following is an example of a subform element that encloses two text fields:
Example 2.4
<subform name="Device"> <field name="ModelNo" x="0" y="0" w="1in" h="12pt"/> <field name="SerialNo" x="0" y="16pt" w="1in" h="12pt"/> </subform>
For more information, please see the syntax description of the subform element.
Exclusion Group
See Exclusion Group on page 32.
Content Elements
A content element is a type of XFA template element that houses datatyped pcdata (text) or images. Such pcdata or graphic elements may be defined as default data in the content element.
XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Composition 34
Most containers have a notion of a value. This value can be used in calculations and may be persisted when the form's variable content is saved. For field and exclGroup containers, the value is the container's content, available through the value subelement. The following diagram illustrates the relationship between elements in a content element.
Content element A value element represent references a datatype element and specifies whether the data may be overridden by the form user or by some other source. A content type element defines the type of the data. It may also include default data, which is used when the form is displayed. Examples of such datatype elements are date, decimal, and image. Content types are later described in Content Types on page 37. value
content type
default data
User Interface
The XFA architecture makes a clear distinction between the content of a container and the user interface (UI) required to render that content and provide interaction. While there often is a relationship between content and UI (e.g., date content would normally be captured with a date-oriented UI), the separation allows both the application and the form designer some degree of flexibility in choosing the right UI. This separation allows the form designer to exert some control over the user interface, selecting the widget most appropriate for each instance of a given type of content. Each container may have a ui subelement for specifying user interface for the container. That element, in turn, may contain an optional child element, specifying a possible user interface for the container. If the UI element contains no children or is not present, the application chooses a default user interface for the container, based on the type of the container's content. The chapter User Experience on page 417 provides more information on the user interface described by XFA templates.
Basic Composition
This section describes the basic aspects of creating a template. Such issues include measurements and positioning graphic elements within a parent container. Basic Layout on page 46 describes how container elements are placed on a page.
Measurements
All measurements are comprised of two components:
The quantity or value of the measurement The (optional) unit of the measurement
XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Composition 35
The following is an example of fields containing different font elements with the equivalent field and font size expressed in a variety of different measurements.
Example 2.5
<field name="f1" y="1in" h="72pt" w="4in"> <font typeface="Helvetica" size="72pt"/> </field> <field name="f2" y="2in" h="1in" w="4in"> <font typeface="Helvetica" size="1in"/> </field> <field name="f3" y="3in" h="1" w="4in"> <font typeface="Helvetica" size="1"/> </field>
Values
All measurements have a quantity or value, which is expressed in a particular unit that may either be explicitly stated or implied. Common uses of measurements include the description of a length or width of an element, the position of an element, or an offset from a coordinate. The format of a measurement is a value, consisting of the following parts:
An optional sign character one of "+" (the default) or "-" A number a number with optional fractional digits An optional unit identifier
1in one inch -5.5cm minus five and a half centimeters 30pt thirty points 0 a measurement of zero with the unit omitted
Units
All measurements are expressed in a particular unit which may be specified as a suffix to the value. The unit is known by a short textual identifier, such as "in" for inches. The default unit is assumed to be inches. In other words, the following are equivalent:
3.5in 3.5
The following list is the set of allowable units and the corresponding identifiers:
cm centimeters in inches (This specification considers one inch to be exactly 2.54 centimeters.) mm millimeters pt points (This specification considers a point to be exactly 1/72 of an inch.)
Note that a unit specification is not required or implied when the measurement value is zero. Not all elements may support all possible types of units, as described in Restrictions (below).
XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Composition 36
Angles
Certain measurements requires the specification of an angle. Angles are always specified in degrees and are measured counterclockwise from a line parallel to the X axis.
Restrictions
Individual elements may place restrictions on measurements; in these cases the corresponding specification of the element will clearly describe the restrictions if no restriction is noted, then the element does not exhibit any restrictions on measurements. For instance, the specification for an element may:
Restrict the use of the sign character, limiting the measurement to either a positive or negative value Restrict the value, limiting the measurement to whole numbers
Border Formatting
A UI element may describe formatting characteristics for a border around the widget.
Borders
A border is a rectangle around a widget. Independent control over the appearance of sides and corners of the rectangle is provided. The border has its own margins, independent of the widget's margins. It is possible for the widget to overlap the border. However the widget always draws on top of the border. A border is comprised of one or more optional:
Edges the sides of the box, described by edge elements Corners the intersections of the edges, described by corner elements
The border is rendered starting at the top-left corner and proceeding clockwise, using up edge and corner elements in the order of rendering. Thus the first edge element represents the top edge, the next represents the right edge, then the bottom, then the left. Similarly the corner elements are in the order top-left, top-right, bottom-right and then bottom-left. If fewer than four edge or corner elements are supplied the last element is reused for the remaining edges or corners. If no corner element is supplied at all then default properties are used for all corners. However if no edge element at all is supplied, not even an empty element, then the border is not rendered. However such a border may still be filled as described below. Note: Prior to version 2.6 this specification did not specify the behavior when there were fewer than four edge or corner elements. The behavior specified here matches that exhibited by Acrobat. The border can also include a fill specification, indicating that the area enclosed by the border is to be filled with some sort of pattern or other shading. As with the edges of the border, the widget always draws on top of the fill.
XFA Specification Chapter 2, Template Features for Designing Static Forms Content Types 37
Thickness
Borders have outlines that are rendered according to one or more pen-strokes. The edge and corner elements within a border represent pen-strokes. Each of these elements possesses an attribute which determines the thickness of the stroke, and as the thickness increases the stroke appears to become wider and spread further toward the inside of the border. This growth toward the inside ensures that the graphical representation of the border fits within the nominal extent of the border.
Fill
The fill element indicates how the region enclosed by the border is to be filled. Types of fill include:
None Solid Hatching and crosshatching Stippling of two colors Gradient fills:
Linear Radial
The fill element has a child color element. One can think of this as specifying the background color for the fill. The fill element also has a child element specifying the type of fill, such as solid, pattern, and stipple. This child, in turn, has its own child color element. This second color can be thought of as the foreground color. For example, the following would create a fill of horizontal black lines on a gray background.
Example 2.6
Note: If the fill element is omitted or empty the result is a solid white fill.
Content Types
Within a template default data is represented within value elements, as shown in the following examples. The content types are identified in bold.
Example 2.7
XFA Specification Chapter 2, Template Features for Designing Static Forms Content Types 38
Example 2.8
<field y="10mm" x="10mm" w="40mm" h="10mm"> <value> <text>Hello, world.</text> </value> </field>
Text
The text content type element enclose text data, as shown in Example 2.8. Text is any sequence of Unicode characters. Alphabetic text includes any Unicode character classified as a letter in the Basic Multilingual Plane (BMP), described in [Unicode-3.2]. An alphanumeric character is any Unicode character classified as either a letter or digit in the BMP.
In most cases, people filling out a form will supply date, time and dateTime data in a format specific for the locale. As described in Localization and Canonicalization on page 139, such localized forms are converted to a canonical format before being represented as data in the form. Similarly, canonical data is converted into a localized form before being present to the user.
XFA Specification Chapter 2, Template Features for Designing Static Forms Content Types 39
Description The content of a boolean element must be one of the following: Digit 0 (U+0030) 1 (U+0031) Meaning Logical value of false Logical value of true
integer
An optional leading sign (either a plus or minus, Unicode character U+002B or U+002D respectively), followed by a sequence of decimal digits (Unicode characters U+0030 U+0039). There is no support for the expression of an exponent. Examples of canonical integer content are shown below:
12 -3
decimal
A sequence of decimal digits (Unicode characters U+0030 - U+0039) separated by a single period (Unicode character U+002E) as a decimal indicator. Examples of canonical decimal content are shown below:
+12. 1.234 .12 -123.1
In decimal content types, the number of leading digits and fractional digits may be retained. Note: If a person filling out a form supplies non-conforming data for a decimal content type, the XFA processing application may chose to automatically convert the data into the decimal equivalent. float An optional leading sign (either a plus or minus, Unicode character U+002B or U+002D respectively), followed by a sequence of decimal digits (Unicode characters U+0030 U+0039) separated by a single period (Unicode character U+002E) as a decimal indicator. Examples of canonical float content are shown below:
1.33E-4 .4E3 3e4
Note: If a person filling out a form supplies non-conforming data as the value of a decimal content type, the XFA processing application may chose to automatically convert the data into the float equivalent.
Absent Content
When no content is present, the content shall be interpreted as representing a null value, irrespective of properties that specify null characteristics (bind.nullType).
XFA Specification Chapter 2, Template Features for Designing Static Forms Content Types 40
Images
The image content type element may enclose an image. XFA fields may accept images as data from a user or from an external source. Note: The image formats supported by an XFA processing is application dependent.
Example 2.9
<field name="ImageField1" w="80.44mm" h="28.84mm"> <ui> <imageEdit data="embed"/> </ui> <value> <image contentType="image/jpg">/9j/4AAQSkZJRgABAQEASA wcUUUVzm5//Z</image> </value> </field>
Image Data on page 133 describes processing guidelines for including in the XFA Data DOM image href references that appear in data.
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External Data
The exData content type may enclose foreign data, which is PCDATA that represents the actual data content of the specified content type. The actual data is encoded as specified by exData. When no data content is provided, the data content may be interpreted as representing a null value. This behavior is dependent upon the context of where the data content is used. For instance, a field may interpret empty data content as null based upon its bind.nullType property.
Layout Strategies
There are two layout strategies for a layout container, positioned layout and flowing layout. In positioned layout, each layout object is placed at a fixed position relative to its container. In flowing layout, objects are placed one after the other in sequence, and the position of each object is determined by all the previous objects to be placed in the same container. Most layout containers can use either positioned or flowing layout. However blocks of text always use flowing layout internally. The words and embedded objects within a block of text flow from left to right and/or right to left in lines and the lines stack from top to bottom. A pageArea object, which represents a physical display surface, has the opposite limitation; it can only use positioned layout. In XFAF forms top-to-bottom layout is used by the outer subform to represent the flow of pages. All other layout objects use positioned layout, except for the words and embedded objects within blocks of text.
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External Application and a Basic XFA Form on page 109. Each record consists of a stream of characters. In the case of rich text, each record may also include formatting markup and embedded objects.
This is an example of some textual data content that has a 'Left' horizontal alignment and a 'Top' vertical alignment.
This is an example of some textual data content that has a 'Center' horizontal alignment and a 'Top' vertical alignment.
This is an example of some textual data content that has a 'Right' horizontal alignment and a 'Top' vertical alignment.
This is an example of some textual data content that has a 'Left' horizontal alignment and a 'Middle' vertical alignment.
This is an example of some textual data content that has a 'Center' horizontal alignment and a 'Middle' vertical alignment.
This is an example of some textual data content that has a 'Right' horizontal alignment and a 'Middle' vertical alignment.
This is an example of some textual data content that has a 'Left' horizontal alignment and a 'Bottom' vertical alignment.
This is an example of some textual data content that has a 'Center' horizontal alignment and a 'Bottom' vertical alignment.
This is an example of some textual data content that has a 'Right' horizontal alignment and a 'Bottom' vertical alignment.
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Text data that uses a radix separator (usually a floating point number) may be horizontally aligned around the radix separator, with the radix being a set distance from the right, as shown at right. A field element with such alignment is shown in the following example.
5.1
Flowing Text Within a Container on page 53 describes text placement and justification in more detail.
Line Height
To flow text and other flowed objects, the application may have to choose break points for wrapping. The result is that the flowed content is rendered as a series of one or more lines. The height of each line is known as the line height. If line height is not specified in a para element, it is typically determined from the current font element. If multiple fonts are used in a line, the processing application must use the maximum line height asserted by any of the fonts in the line.
Other Formatting
In addition to alignment, justification and line height, the para element may specify left and right margins, radix offset, spacing above and below the paragraph, tab stops and tab indenting. In addition to line height, the font element may specify baseline shift, strike-through characteristics, overline, underline, angle, size, typeface, and weight.
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In general, GUI-based template design applications and XFA processing applications provide formatting buttons that allow users to apply styling characteristics to text. For example, the UI in such applications may provide a Bold button the user applies to selected text. In response, the application converts the entire body of in-focus text into a rich text representation and encapsulates the selected text within a <b> element, as shown in the example in the following example. In the following example, the markup instructions specify the font family should be Courier Std and specify that the words "second" and "fourth" should be bold, as illustrated below. Also notice the appearance of the attribute allowRichText="1", which tells an XFA processing application that its UI must support entry of rich text values for the field.
Produces:
The second and fourth words are bold.
The chapter Representing and Processing Rich Text on page 192 provides more detailed information on rich text.
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XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Layout 46
Assume that the field InventoryNumber contains the default text. When printed the field appears as follows (actual size):
1234567890
In the example, the field elements width (w) and height (h) attributes control the width and height of the barcode, hence the dimensions and spacing of the individual bars. In addition the field font, specified by the font element, controls the font used for the human-readable text embedded inside the barcode. The type attribute of the barcode element determines what type of barcode is printed. The example uses a 3-of-9 barcode. 3-of-9 barcodes are very common but not tightly specified so there are many parameters controlling the appearance of the barcode. Other attributes of the barcode element determine how many characters are in the barcode (dataLength), whether there is human-readable text and where it is located (textLocation), and the ratio of the width of wide bars to narrow bars (wideNarrowRatio). There are other applicable parameters which are defaulted in the example. Barcode readers are used only with printed forms; therefore, although a field may be designated as a barcode field it need not appear as a barcode in an interactive context. When the field has input focus some sort of text widget must be presented so that the user can edit the data. When the field does not have input focus the appearance is application-defined. For more information about using barcodes in XFA see Using Barcodes on page 365.
Basic Layout
This section describes the most common aspects of how widgets are arranged and presented on the presentation medium. It explains how the objects that appear on a page are positioned relative to the page and to one another. This section also describes text flow and justification.
Box Model
In order to understand the ways in which relative positions are calculated it is necessary to understand the box model. Layout employs a box model in which model objects (both containers and displayable entities) are represented by simple rectangles called nominal extents. Each nominal extent is aligned with the X and Y axes and represents the amount of physical space on the page that is reserved for a particular object. Some nominal extents are calculated at run time, for example the extents for blocks of variable text in fields. Other nominal extents are presupplied. Fields in XFAF forms have nominal extents supplied explicitly via the w (width) and h (height) attributes. Each of these attributes is set to a measurement. The field's margins, if any, and its caption, if any, lie inside the nominal extent. Fields may have borders. In XFAF forms the borders always lie inside the nominal extent of the field. Fields are containers with box models, but the content of the field may have its own box model. For example a field may contain an image which has its own box model. Hence the box model is recursive; box models may contain box models.
XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Layout 47
The relationship between the nominal extent, borders, margins, captions, and content is shown at right.The Nominal Content Region is the rectangular area left over after container's margins have been applied to its nominal extent. This is the space normally reserved for display of and interaction with the container object's content. Note that the caption may occupy part of the nominal content region. The rules governing width and height for each type of layout object are given below:
border inset
right margin
border inset
content
bottom margin
caption region
Relationship between nominal extent and borders, margins, captions, and content
Barcode
There are two types of barcodes, one-dimensional and two-dimensional. For some one-dimensional barcodes the width is fixed by the barcode standard. For others the width varies with the number of symbols in the data and the presence or absence of check symbol(s). In addition for some one-dimensional barcodes the width of a symbol is adjustable. For some one-dimensional barcodes the height is fixed by the standard. For others the height is adjustable. For two-dimensional barcodes the width varies with the number of columns and the cell size. The height varies with the number of symbols in the data, the presence or absence of check symbol(s), and the cell size. Note that barcode standards often dictate a margin around the barcode as well. The barcode size as computed by the layout processor does not include any such mandated margin. It is up the creator of the template to set the appropriate margin in the container. Hence the form creator can cheat as desired.
Captions
Captions may have explicit heights or widths supplied by a reserve attribute. The reserve is a height if the caption is placed at the top or bottom of its container, but a width if the caption is placed at the left or right of its container. When the reserve attribute is not supplied or has a value of zero, the layout
border inset
top margin
XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Layout 48
processor calculates the minimum width or height to hold the text content of the caption. This calculation is described in Text on page 38.
Fields
Fields may have explicit widths supplied by w attributes and/or explicit heights supplied by h attributes. When either of these attributes is not supplied, the layout processor must calculate it. The first step is to compute the size of the field content. If the field contains text the width and/or height of the text content is first calculated as described in Text on page 38. If the field contains an image the height and/or width of the image content is calculated as described in Images on page 40. After this, if there is a caption, the layout processor adjusts the height and/or width to account for the caption. When the caption is on the left or right, the width is adjusted by adding the caption width plus the caption left and right margins. When the caption is above or below, the height is adjusted by adding the caption height plus the caption top and bottom margins.
Images
Depending upon the value of the aspect property an image may keep its original dimensions, it may grow or shrink in both dimensions while retaining its original aspect ratio, or it may grow or shrink independently in each dimension to fill the container. In all but the last case it may display outside the nominal extent. Some image formats do not specify a physical size, only horizontal and vertical pixel counts; in such cases the application assumes a pixel size to arrive at a natural width and height. The assumed pixel size is application-dependent and may vary with the graphic file type and/or display or print device. The following figure shows an example of resizing an image in a container using different aspect settings.
XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Layout 49
aspect="actual"
aspect="none"
aspect="height"
aspect="width"
aspect="fit"
Subform
The subform element describes a logical grouping of its child elements. In XFAF forms subforms have no visible appearance, hence no box model.
Text
The height calculation for each line must take into account the height of each character (which depends on the type face and size), the positioning of characters above the baseline (superscript) and below the baseline (subscript), and underlining. The overall height is the sum of the individual line heights, plus the sum of the leading between lines. The width calculation for each line must take into account the width of each character, including white space characters, and for the first line the text indent. The overall width is the largest of the line widths. The following figure shows these quantities.
XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Layout 50
top margin
is the question. Whether 'tis nobler in the mind to bear the slings and arrows of outrageous fortune, or take
bottom margin
line height
left margin
right margin
Size
Most widgets do not have explicit size attributes. All widgets can resize themselves to fit the containing field; if the field containing the widget has a specified size then the widget's extent grows or shrinks to fit the imposed size. If no size is imposed on the widget it expresses its natural size. The natural size of a widget and the factors that control it vary with the widget type. A widget may temporarily grow to occupy a larger area of the screen while the widget has focus (like a drop-down list). However as soon as focus is lost the widget goes back to its normal size. The table below lists sizes for widgets when they do not have focus and also when forms including images of a widgets are printed to hard copy. The size of a widget while it has focus is up to the implementation.
Has no natural size (or a natural size of zero) because it does not display any content. A field containing a button displays only the field caption and field borders, but with their appearance changed to indicate clickability. The size property plus left and right margins. Defaults to 10 points and no margins. The size property plus top and bottom margins. Defaults to 10 points and no margins.
line height
leading
XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Layout 51
May be displayed temporarily by the application during data entry while the field has focus. When the field loses focus it reverts to the same display rules as a text edit. Same as text edit. Same as a text edit. Same as text edit. Same as text edit.
Same as a text edit, except each character of content is replaced with an asterisk (*) character. Implementation-defined. The width of the text block plus the left and right margins. Defaults to no margins. The height of the text block plus the top and bottom margins. Defaults to no margins.
Clipping
When the content does not fit into the container the excess content may either extend beyond the region of the container or be clipped. The permissible range of actions varies according to the type of container and the context (interactive or non-interactive). When the container is a field and the context is interactive, the content of the field may be clipped. However some means must be provided to access the entire content. For example, the XFA application might arrange that when a field gains focus a widget pops up. The widget could be dynamically sized or it could support scrolling. When the container is a field and the context is non-interactive (for example printing to paper) the content must not be clipped. The content may be allowed to extend beyond the field or it may be shrunk to fit the field.
XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Layout 52
When the container is a caption the behavior is implementation-defined. It is the responsibility of the form creator to ensure that the region is big enough to hold the content.
Rotating Containers
Container elements may be rotated about their anchor point. Rotation is in degrees counter-clockwise with respect to the default position. Angles are supplied as non-negative multiples of 90. In the following example, the field is rotated counter-clockwise 90 degrees.
Transformations
Presenting the form to the user, or printing it to paper, requires that the many objects inside the template be assembled by the processing software. During this assembly, many geometric transformations must
XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Layout 53
take place. A container object must position or flow its enclosed objects within its nominal content region, using its own coordinate space. If a container holds other containers as its content, those child containers in turn position or flow their content within their own coordinate spaces. It is not the responsibility of this document to mandate the actual implementation of transformations. However, by describing one possible implementation, transformation calculations become more obvious. This particular implementation is provided to be illustrative of transformations. In this implementation, there is a clear separation between what the enclosed object knows and what the enclosing container knows. Regardless of margins and the internal coordinate origin, the enclosed object adjusts the coordinates that it makes available to the container so that (0,0) is the top-left corner of the contained object's nominal extent. We refer to these as common coordinates, which are coordinates the parent can easily transform into its own coordinate space. See Algorithms for Determining Coordinates Relative to the Page on page 1188.
When placing text into a fixed-width region the text records are interpreted as paragraphs. The layout processor starts each new paragraph on a new line. Within each paragraph the layout processor treats the text as a string of text layout units. A text layout unit may be an embedded non-text object or it may be a word. The boundaries of layout units may be delimited by the edges of embedded non-text objects or by white space characters. In many languages text layout units are words, separated by white space. However not all languages use white space to delimit words. Therefore, the parsing of words is language-dependant. Which languages are supported is implementation-dependant, but all implementations should support some locale that uses the Unicode Basic Latin and Latin-1 Supplement character codes (U0021 through U007E inclusive). The complete rules for parsing words are given in Unicode Standard Annex 14 [UAX-14]. Note that these rules were first adopted in XFA 2.2. The initial flow direction depends on the locale. However a single paragraph of text can contain text from different languages that flows in different directions. For example, the language of the locale is Arabic so the initial flow direction is right to left. However the text contains a phrase in English that flows from left to
XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Layout 54
right. The flow direction of the English phrase may be explicitly indicated by codes reserved for this purpose in Unicode, or the text engine can infer it from the use of English letters in the phrase. The whole complicated set of rules is specified in Unicode Annex 9 [UAX-9]. By applying these rules the text layout engine divides the paragraph into segments, such that within each segment the flow is all in one direction. Note: Unicode Annex 9 has been widely embraced and incorporated into many other standards. However Microsoft has its own way of doing things which is close to, but not quite in accordance with, the Unicode standard. Do not expect XFA flow direction to exactly match the behavior of non-conformant software. If the container has fixed dimensions and the flowed text exceeds the boundaries of the container, the view of the text must be adjusted as described in Clipping on page 51.
XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Layout 55
Description If hAlign is set to left the line is positioned so that its left-most text layout unit abuts the left edge of the region. If hAlign is set to right the line is positioned so that the right-most text layout unit abuts the right edge of the region. If hAlign is set to center the line is positioned so that the middle of the line is at the middle of the region. The figure at right shows an example of justification with the hAlign attribute set to left. For these values the effect is the same regardless of the flow direction.
Illustrated Effect
To be, or not to be: that is the question: Whether 'tis nobler in the mind to suffer The slings and arrows of outrageous fortune, Or to take arms against a sea of troubles, And by opposing end them? contentArea
draw
justifyAll For each line, instead of incorporating the supplied white space characters, blank regions are inserted between layout units, one per breaking whitespace character in the original text, sized, until the line fills the region from left to right. The effect is the same regardless of the flow direction.
draw There are 4 spaces after this only 2 after this contentArea word but word.
XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Layout 56
Description All lines are justified except the last one in the paragraph. The last line is left aligned if the initial flow direction is left to right and right aligned if the initial flow direction is right to left. If hAlign is set to radix, then the text is treated as a column of numbers, one per line. In this case the radixOffset property supplies the position of the radix character (. or , depending upon the locale). Each line is positioned so that the left edge of the radix character's layout extent is at the radixOffset distance from the right edge of the region. If the line of text does not contain a radix character the right edge of the line's layout extent is positioned at the same point, so that the line is treated as an integer and aligned with the place where it's radix point would have been. If a line contains more than one radix character the first one (in character order) is the one used for alignment. Radix alignment can only be used with place-value numbering systems. The same algorithm works for all known place-value numbering systems, because they all flow left to right from the most significant to the least significant digit. This is a consequence of the historical spread of place-value notation from India to Arabia and thence to Europe..
Illustrated Effect
radix
Concealing Containers
A container may be hidden from view by setting its presence attribute to hidden or invisible. A value of hidden prevents the container and its content from being displayed on the form. A value of
XFA Specification Chapter 2, Template Features for Designing Static Forms Basic Layout 57
invisible also prevents the container and its content from being displayed, however they still take up space on the form. In static forms the space taken by a field is fixed however the location of the associated caption may shift if the field is hidden.
When an outer container contains inner containers, and the outer container has a presence of hidden or invisible, the inner containers inherit the outer containers hidden or invisible behavior regardless of their own presence attribute values. Even when hidden or invisible a container is still present in the form and takes part in normal non-interactive activities. For example a hidden or invisible field may be used to calculate a value and hold the result of the calculation. Alternatively it may hold data that is loaded from an external file or database so that the data can be used in other calculations.
If the template element specifies a relevant value that includes a viewname that is not preceded by "-" and is not specified in the configuration, the element is excluded. If the template element specifies a relevant value that includes a viewname that is preceded by "-" and is specified in the configuration, the element is excluded.
XFA Specification Chapter 2, Template Features for Designing Static Forms Appearance Order (Z-Order) 58
The following table provides examples of the inclusion or exclusion of container elements based on the template and config relevant values.
Inclusion/exclusion of container elements based on correlation between "relevant" value in template container element and config
Config relevant element Template relevant attribute
print manager -print -manager print -manager -print manager -print -manager "" (null) print manager manager print summary "" (null)
XFA Specification Chapter 2, Template Features for Designing Static Forms Extending XFA Templates 59
GUI-based template design applications may provide the ability to move an object in front of or behind another object. Such movement is accomplished by changing the order in which the objects appear in the document. In the following example, TextField2 obscures TextField1. TextField1 could be placed on top of TextField2 by simply reversing the order in which they appear in the document.
Note: XFA processors are not expected to do anything to prevent fields and their associated widgets on the same page from overlapping. It is up to the creator of the form to ensure that the extents assigned to the fields do not overlap, if that is what is desired.
XFA Specification Chapter 2, Template Features for Designing Static Forms Connecting the PDF to the XFA Template 60
Flags
The PDF specification [PDF] defines a NeedsRendering flag in the the catalog dictionary (document catalog) which controls whether PDF viewers attempt to regenerate the page content when the document is opened. Only dynamic templates contain the information required to regenerate the full page content including the boilerplate. XFAF templates do not contain this information so for XFAF forms the flag must be false.
Resources
An XFAF form may be contained in an XDP document. The XDP may be a standalone document which also contains the associated PDF. However it is more common for the XFAF form to be embedded inside a PDF file. When the PDF contains the XFAF form, the XFA template and other XFA packets are contained in an entry in the interactive form dictionary with the key XFA. The interactive form dictionary is referenced from the AcroForm entry in the document catalog. The presence of these entries tells the PDF processor that the form is an XFAF form. For more information see the PDF specification [PDF].
Field Names
PDF has long included support for interactive fields. Each interactive field has a partial name, as described in the PDF specification [PDF]. When the interactive field is global (i. e. not inside another field) its partial name is also its fully qualified name. In an XFAF form each PDF field is global and its name is an expression which points to the corresponding field element in the XFA template.
XFA Specification Chapter 2, Template Features for Designing Static Forms Connecting the PDF to the XFA Template 61
The expressions used to link PDF fields to XFA fields employ a grammar known as the XFA Scripting Object Model (XFA-SOM). This grammar is used throughout XFA and is described in the chapter Object Models in XFA on page 63. The grammar is non-trivial, but fortunately the whole grammar is not required for this particular purpose. For this purpose it is enough to know that the expression consists of form followed by the names of the objects (starting with the outermost subform) that must be entered in turn to reach the field. The names are separated by dot (.) (U+002E) characters. Usually XFAF forms have a subform per page plus a root subform holding all of the page subforms, so this works out to form.rootname.pagename.fieldname. Note: For normal AcroForm fields the partial field name is not allowed to contain the dot character. This restriction does not apply to fields which are simply pointing to an XFA field.
In this example the PDF field linked to the first field in the template would be named form.PurchaseOrder.CustomerID.FirstName. The PDF field linked to the second field would be named form.PurchaseOrder.CustomerID.LastName. It is also possible for there to be multiple subforms and/or multiple fields with the same name and the same enclosing element. These are distinguished using a numeric index, with 0 as the index of the first same-named element.
Example 2.19 PDF field names for an XFAF form with duplicate names
<template ...> <subform name="PurchaseOrder" ...> <subform name="Items" ...> <!-- The first row in a table --> <field name="PartNo" ...> ... </field> <field name="Description" ...> ... </field> <field name="Quantity" ...> ... </field> <field name="UnitPrice" ...> ... </field> <field name="Price" ...> ... </field> <!-- The second row in the table --> <field name="PartNo" ...> ... </field> <field name="Description" ...> ... </field> <field name="Quantity" ...> ... </field> <field name="UnitPrice" ...> ... </field> <field name="Price" ...> ... </field> <!-- The third row in the table --> <field name="PartNo" ...> ... </field> <field name="Description" ...> ... </field> <field name="Quantity" ...> ... </field>
XFA Specification Chapter 2, Template Features for Designing Static Forms Connecting the PDF to the XFA Template 62
<field name="UnitPrice" ...> ... </field> <field name="Price" ...> ... </field> <!-- More rows in the table --> ... </subform> </subform> </template>
In this example the PDF field linked to the part number field in the first row of the table would be named form.PurchaseOrder.Items.PartNo[0]. The PDF field linked to the part number field in the second row would be named form.PurchaseOrder.Items.PartNo[1], and so on.
Field location
Each XFA field corresponds to a PDF interactive field (AcroForm field) as described in Field Names on page 60. The PDF field name locates its corresponding XFA field element on the particular page of the PDF that contains the PDF field. However the field elements own x and y attributes determine its location on the page, regardless of the position of the PDF field on the page.
XFA Names explains the syntax of names that can be assigned to individual template elements. Such names are important in the subsequent sections in this chapter. Document Object Models introduces the various Document Object Models (DOMs) used in XFA and discusses the general rules governing their relationship to XML. Then, it gives an overview of how the various DOMs interact with each other and with XFA processors. Scripting Object Model introduces the expression syntax used to refer to objects in the DOMs. This expression syntax is known as the XFA Scripting Object Model (XFA-SOM).
XFA Names
An XFA name is a valid XML name, as defined in the XML specification version 1.0 [XML], with the additional restriction that it must not contain a colon ( : ) character. XFA element names are used in the following ways:
Explicitly identifying an object in an XFA DOM, using the XFA Scripting Object Model syntax (Scripting Object Model on page 74) Associating data with template fields, as part of data binding
The XML Specification version 1.0 defines name as follows: Name is a token beginning with a letter or one of a few punctuation characters, and continuing with letters, digits, hyphens, underscores, colons, or full stops, together known as name characters. Names beginning with the string "xml", or with any string which would match (('X'|'x') ('M'|'m') ('L'|'l')), are reserved for standardization in this or future versions of this specification. Note: The Namespaces in XML Recommendation [XMLNAMES] assigns a meaning to names containing colon characters. Therefore, authors should not use the colon in XML names except for namespace purposes, but XML processors must accept the colon as a name character. An Nmtoken (name token) is any mixture of name characters.
NameChar ::= Letter | Digit | '.' | '-' | '_' | ':' | CombiningChar | Extender
63
They are strictly tree-structured. A node may have mandatory children. In such cases the mandatory child nodes are created at the same time as their parent. The non-mandatory children of each node in the tree are ordered by age. That is, the DOM is aware of the order in which the non-mandatory child nodes were added.
There are many DOMs in XFA. The large number arises because XFA exposes almost all processing. For each step in processing there is a DOM holding the data structures for that stage. Scripts can examine and modify each DOM. DOMs are responsible for maintaining internal consistency but not external consistency. For instance, when a script turns on a radio button by assigning to the corresponding field, all the other buttons coupled to that one are automatically turned off. This is a matter of internal consistency so it is managed by the Form DOM itself. By contrast the XFA Data DOM does nothing to prevent a script violating the rules of XML, for instance by giving an element two attributes with the same name. This is a matter of external consistency so it is the responsibility of the script author, not the DOM.
Hierarchy of DOMs
The XFA DOM encapsulates all the DOMs which are directly manipulated by XFA processors. The root nodes of most of the other DOMs are children of the root node of the XFA DOM. All but one of the remaining root nodes are grandchildren of the root node of the XFA DOM. Note: If an application has more than one form open simultaneously, each open form has its own separate XFA DOM. There is no way for an expression or script in one form to refer to another form. XFA processors also make use of non-XFA DOMs to represent parsed XML documents. These XML DOMs stand between one or more XFA DOMs and the physical XML document. For example when an XFA processor reads an XML data document, it first builds the XML Data DOM representing the parsed XML data document, then builds the XFA Data DOM derived from the XML Data DOM.
This encapsulation is convenient for scripting. Scripts refer to nodes in the XFA DOM using XFA Scripting Object Model (XFA-SOM) expressions. All of the DOMs contained within the XFA DOM can be referenced using a uniform syntax. The XML DOMs, because they are not inside the XFA DOM, are not directly accessible to scripts. However the XFA DOM is tightly coupled to the XML DOMs and exposes some content of the XML DOMs to scripts. At the same time the XML DOMs preserve information that is omitted from the XFA DOMs, such as processing instructions. When the XFA processor writes out an XML document it reinserts the information that is missing from the XFA DOM but preserved in the documents XML DOM. An XFA form can also carry with it custom, that is to say non-XFA, packets. Each custom packet is represented in the XFA DOM by a placeholder node which is the child of the root node. The name of this node is taken from the XML tag that encloses the custom packet. The placeholder node does not have any children, nor any useful methods or properties. The following illustration shows the hierarchy of the principal DOMs in XFA.
config
Config DOM
Data DOM
layout
Layout DOM
XFA DOM
template
Template DOM
Properties
Properties are nodes that are automatically present in the DOM even if they are missing from the XML. For example, a subform node in the Template DOM always has beneath it a bind property node, whether or not the XML from which it was loaded included a bind element. If there is no bind element in the XML then at load time the bind property node is created with default values. Some properties are represented by elements, others by attributes. Property attributes are restricted by the rules of XML to be singly-occurring and placed within their respective start tags. Property elements can physically occur more than once per parent, but in every case the number of occurrences is restricted by the DOM. For example, there can only be one bind property node per subform parent node, hence only one bind element per enclosing subform element. Most properties are restricted to a single occurrence. In addition, properties represented by elements may themselves have subproperties. For example the bind property has match, and ref subproperties. However there is no logical distinction between element and attribute properties at the DOM level. The order of occurrence of different properties within the same enclosing element is not significant. For those few properties that are multiply-occurring, the order of occurrence with respect to each other is significant, but not the order of occurrence with respect to other properties. In the terminology used by the RELAX schema language [RELAX-NG], properties can interleave. The following example shows a fragment from the XML representation of an XFA template.
Example 3.1
When the fragment is loaded into the Template DOM the result is as follows:
eld
name "author"
margin
leftInset "3mm"
rightInset "0"
topInset "2mm"
bottomInset "0"
Properties in a DOM
Note that this does not show all of the properties of a field. There are many. The following XML fragment produces exactly the same logical result as the previous example.
Example 3.2
In this fragment the order of the topInset and leftInset properties has been changed but this is not significant and is not necessarily reflected in the DOM.
Children
Children are nodes that can occur any number of times (including zero). When expressed in XML child elements can freely interleave with property elements and such interleaving has no significance. However the order of child nodes with respect to each other is significant. When a DOM is expressed in XML document order corresponds to a depth-first traversal of the tree. For child nodes document order corresponds to oldest-to-youngest. By convention oldest-to-youngest is also referred to as left-to-right. For example, consider the following fragment of XML, again representing part of a template.
Example 3.3
<subform name="book"> <field name="title" > </field> <field name="author" > </field> <field name="publisher" > </field> <field name="ISBN" > </field> </subform>
When the fragment is loaded into the Template DOM the result is as follows:
name book
field
field
field
field
name author
name publisher
name ISBN
Children in a DOM
The subform object has five nodes below it, one property node and four child nodes. Each of the child nodes is a field object. There are exactly as many child nodes as are present in the XML. The document order of the children is exactly as presented in the XML. Note that a similar hierarchy is used in XDP documents to represent a collection of DOMs in a single document. However an XDP may contain subtrees that are not represented by a DOM (for example application-specific data). At the same time some DOMs (such as the Form and Layout DOMs) are never represented in an XDP. For this reason in an XDP the outermost element tag is xdp rather than xfa.
data values that are not bound to any field. the fact that the user has overridden the calculation of a field, so it should not be calculated upon reloading. modifications made to the Form DOM by scripts, for example changing the border color of a field.
This specification does not define a syntax for saving the Form DOM in XML. One could save it using the same schema used for XML representations of the Template DOM, however this would unnecessarily duplicate a lot of information from the Template DOM. The Form DOM is the natural territory of scripts because it is where logical entities assume values. For example, when the user tabs into a field, the resulting field enter event is associated with a field object in the Form DOM, not the Template DOM. When the script runs, the "$" or this variable points to the field object in the Form DOM.
There are property nodes in the XFA Data DOM. However usually these do not represent elements or attributes in the XML data document. Rather they hold properties associated with an element or attribute. For example, each node has a name property which holds the start tag of the element or the name of the attribute. Similarly there is namespace property which holds the full namespace of the element or attribute, regardless of whether it was inherited or declared explicitly. Sometimes a property node does correspond to a particular attribute but in such cases the attribute is in a reserved namespace and is treated as out-of-band information. For example, the xsi:nil attribute defined by [XML-Schema] in the namespace http://www.w3.org/2001/XMLSchema-instance is not represented in the XFA Data DOM as a data value node. Instead it modifies the isNull property of the data value node corresponding to the element which holds it. There are a large number of options available to transform the data on its way in from the XML Data DOM to the XFA Data DOM. In most cases the reverse transform is applied on the way out. Hence scripts which operate on the XFA Data DOM can be isolated from details of the XML representation. For example, it is possible to rename particular elements or attributes on the way in. When the data is subsequently written out to a new XML document the original element tags appear in the new document. The XFA Data DOM is not directly loaded from or written to XML. However its content is echoed in the XML Data DOM which is always loaded from and/or written to XML. Unlike most other DOMs, the XFA Data DOM may operate in record mode. In this mode only global data plus a window of record data is resident in memory at any moment. Note: Throughout this specification when the term Data DOM is used without specifying the XML Data DOM or the XFA Data DOM, the XFA Data DOM is implied.
Data Document
XSLT Engine
data
Config Document
Legend
Template Document to all DOMS
objects, methods, & properties events
Config DOM
options & URIs
XSLT Engine
template
to all processes
Script Engine
scripts
Template DOM
containers & content
Form DOM
containers & content layout objects
Data Bind
Events
events
layout containers
Layout DOM
Layout
layout objects
content
connection parameters
data
For static forms, similar to a traditional pre-printed paper form, the structure is entirely supplied by the Template DOM. In this case the Form DOM is a duplicate of the subtree under the root subform in the Template DOM, except that some objects in the Form DOM are bound to nodes in the Data DOM. For dynamic forms the form structure varies in response to the data. For example a subform and its fields can be copied into the Form DOM once for each record of data. In this case the objects in the Form DOM are still copied from the Template DOM but the number of copies and/or the arrangement of objects is dictated by the data. The degree and nature of dynamisms is controlled at the level of individual objects in the Template DOM. Hence a form can be partly static and partly dynamic. For example, a subform may be included in the Form DOM conditionally upon the presence of a particular data item, yet the conditional subform may itself have a fixed appearance and content. Data binding is controlled by properties of the objects in the Template DOM and by the names and hierarchy of the objects in both the Template DOM and the XFA Data DOM. The process of binding data to logical structure is described in Basic Data Binding to Produce the XFA Form DOM on page 159.
Example 3.4
<?xml version="1.0" encoding="UTF-8" ?> <Receipt> <Detail> <Description>Giant Slingshot</Description> <Units>1</Units> <Unit_Price>250.00</Unit_Price> <Total_Price>250.00</Total_Price> </Detail> <Detail> <Description>Road Runner Bait, large bag</Description> <Units>5</Units> <Unit_Price>12.00</Unit_Price> <Total_Price>60.00</Total_Price> </Detail> <Sub_Total>310.00</Sub_Total> <Tax>24.80</Tax> <Total_Price>334.80</Total_Price> </Receipt>
The following diagram shows the tree for the receipt data as it is stored in the XFA Data DOM. Although the distinction is not important here, data group nodes are shown in blue while data value nodes are shown in green.
Receipt
Detail
Detail
Sub_Total
Tax
Total_Price
Description
Description
Units
Units
Unit_Price
Unit_Price
Total_Price
Total_Price
Example 3.5
<xdp:xdp xmlns:xdp="http://ns.adobe.com/xdp/"> <template xmlns="http://www.xfa.org/schema/xfa-template/2.6/"> <subform name="Receipt" > <pageSet name="ReceiptPageSet" > </pageSet> <subform name="Detail" > <field name="Description" > </field> <field name="Units" > </field> <field name="Unit_Price" > </field> <field name="Total_Price" > </field> </subform> <subform name="Detail" > <field name="Description" > </field> <field name="Units" > </field> <field name="Unit_Price" > </field> <field name="Total_Price" > </field> </subform> <field name="Sub_Total" > </field> <field name="Tax" > </field> <field name="Total_Price" > </field> </subform> </template> </xdp:xdp>
SOM Conventions
One use for XFA SOM expressions is to specify an explicit binding between a field in the template and a node in the Data DOM.
Example 3.6
The expression $data.Receipt.Total_Price refers to a single node by naming the nodes which must be traversed from the root of the Data DOM down to the desired node. Hence it refers to the Total_Price node which corresponds to the last Total_Price element in the receipt document. (This is the node containing the value 334.80.) The result of this data reference is to force the XFA application to associate the template field named Final_Price with that particular data node, even though the template and data nodes have different names. XFA SOM expressions may also be used in scripting to reference nodes in an XFA-DOM. For example, this FormCalc expression contains an XFA SOM expression (highlighted in bold):
Sum(Detail[*].Total_Price)
This expression takes advantage of "[*]" notation, which is described below under Selecting All Child Nodes on page 88, and scoping, which is described in Relative References. For now it is sufficient to understand that the expression Detail[*].Total_Price resolves as a list of all of the Total_Price data within Detail data groups. With the data given above this becomes 250.00 60.00. The FormCalc function sum() simply adds the list of numbers passed to it, yielding in this case 310.00. This expression would be embedded in the template of an intelligent form that added up the totals and taxes automatically, rather than relying on the data file to supply them pre-calculated. For the receipt example, the data file would be as follows.
Example 3.7
<?xml version="1.0" encoding="UTF-8" ?> <Receipt> <Detail> <Description>Giant Slingshot</Description> <Units>1</Units> <Unit_Price>250.00</Unit_Price> </Detail> <Detail> <Description>Road Runner Bait, large bag</Description> <Units>5</Units> <Unit_Price>12.00</Unit_Price> </Detail> </Receipt>
The following template uses XFA SOM expressions to perform the calculations automatically. XFA SOM expressions embedded in the template are highlighted in bold.
Example 3.8
<xdp:xdp > <template > <subform name="Receipt" > <pageSet name="ReceiptPageSet" > </pageSet> <subform name="Detail" > <field name="Description" > </field> <field name="Units" > </field> <field name="Unit_Price" > </field>
<field name="Total_Price" > <calculate> <script>Units * Unit_Price</script> </calculate> </field> </subform> <subform name="Detail" > <field name="Description" > </field> <field name="Units" > </field> <field name="Unit_Price" > </field> <field name="Total_Price" > <calculate> <script>Units * Unit_Price</script> </calculate> </field> </subform> <field name="Sub_Total" > <calculate> <script>Sum(Detail[*].Total_Price)</script> </calculate> </field> <field name="Tax" > <calculate> <script>Sub_Total * .08</script> </calculate> </field> <field name="Total_Price" > <calculate> <script>Sub_Total + Tax</script> </calculate> </field> </subform> </template> </xdp:xdp>
The template is placed in the hierarchy under the node xfa.template. For example, in the receipt template the Tax field is identified in SOM expressions as:
xfa.template.Receipt.Tax
The data that fills the form is placed in the hierarchy under the node xfa.datasets.data. For example, using the receipt example, the node corresponding to the sub-total is identified in SOM as:
xfa.datasets.data.Receipt.Sub_Total
While the node corresponding to the grand total at the end of the document is identified as:
xfa.datasets.data.Receipt.Total_Price
Note: As usual when data is expressed in XML, case is significant. The following expressions do not match the sub-total node in the receipt example, because the bold letters are in the wrong case:
xfa.datasets.data.receipt.sub_total Xfa.datasets.Data.Receipt.Sub_Total xfa.datasets.data.Receipt.Sub_total
Shortcuts
It would be tedious typing in xfa.datasets.data over and over again. For convenience a set of predefined shortcuts is available. The complete list is described in the following table:
:
Example 3.9
Comments Data that fills the form (Data DOM) Template for the form (Template DOM) Schema(s) or interfaces to host(s) (Connection Set DOM) Joined template and data after a merge operation (Form DOM) Methods and properties belonging to the layout process (pseudo-DOM) Methods and properties that do not belong anywhere else (pseudo-DOM) Current data record (subtree within the Data DOM) Object controlling loading and unloading of data records (pseudo-DOM) Properties of the current event (pseudo-DOM)
$data.Receipt.Tax $template.Receipt.layout $connectionSet.ShoppingCart. soapAction $form.Receipt.Tax $layout.ready $host.setFocus(TaxNode) $record.Tax $dataWindow.isRecordGroup( ref(xfa.datasets.data))
$event xfa.event
$event.name
Example 3.9
Comments Does not require a "." before the next name in the expression Not really shorter but provided for symmetry
!data.Receipt.Tax $xfa.resolveNode("Tax")
Record processing enabled. If record processing is enabled, only a portion of the data is loaded into memory at any one time. This portion is a window containing several consecutive records. Each record is a subtree of the data corresponding to one element and its contents. In this mode of operation $record points to the node representing the outer element for the current record. In the receipt example $record would initially be set to point to the node representing the first Detail element. After some processing $record would advance to the node representing the next Detail element. The receipt example contains only two records, but large documents may contain thousands or millions of records. Record processing not enabled. In non-record mode $record points to the node representing the outermost element of the data document, that is the node which is the only child of $data. In the receipt example $record would be set to $data.Receipt. Hence in non-record mode the entire document is treated as one big record.
See the Creating, Updating, and Unloading a Basic XFA Data DOM on page 109 for more information on record processing.
Repeated Elements
When multiple nodes with the same name occur as children of the same parent node, a reference to the shared name is taken to refer to the first matching child, in document order. (In tree diagrams, document order corresponds to starting at the root node and making a depth-first left-to-right traversal of the tree.) The receipt example includes two sets of data describing purchased items, each in a Detail element. The following expression refers only to the node representing the first Detail element in document order (that is, the one for a giant sling shot):
$data.Receipt.Detail
To access the other Detail nodes, given that they have the same name, it is necessary to use an array-subscript notation. The syntax [nnn], where nnn represents a number, is used to select one particular element out of a group of siblings with the same names. The number zero represents the first sibling. Hence the following two expressions are equivalent:
$data.Receipt.Detail $data.Receipt.Detail[0]
Note: It would not make any difference if there had been other nodes in between, as long as they were not named Detail. For example, the data document could be changed as follows.
<Receipt> <Page>1</Page> <Detail> <Description>Giant Slingshot</Description> <Units>1</Units> <Unit_Price>250.00</Unit_Price> <Total_Price>250.00</Total_Price> </Detail> <Page>2</Page> <Detail> <Description>Road Runner Bait, large bag</Description> <Units>5</Units> <Unit_Price>12.00</Unit_Price> <Total_Price>60.00</Total_Price> </Detail> <Sub_Total>310.00</Sub_Total> <Tax>24.80</Tax> <Total_Price>334.80</Total_Price> </Receipt>
Even with this change to the data document, no change is required to the SOM expression referencing either Detail node. This is an important feature of SOM expressions; they are not invalidated by the insertion or removal of other nodes with different names and hence presumably containing unrelated information. Readers familiar with the RELAX NG schema language will recognize this as equivalent to saying that XFA SOM supports interleaved elements. XFA does not impose any built-in limit to how many sibling nodes can share the same name.
Objects are either nameable or not nameable. For nameable objects, the name specified by the name attribute is the only name for the object. If the name attribute is omitted the object has no name.
The most common reason for XFA objects being nameable, as for the wsdlConnection elements here, is to make it easier to pick a particular item out of a list of items. Naming also enhances modularity by separating the SOM expression that refers to an object from the type of the object. Here, if the xmlConnection is changed to an xsdConnection (because a schema has been published for it), it can still be referenced using the name TsAndCs. Most nameable objects are not required to have unique names. The children of a connectionSet are exceptions in that they are required to have unique names. Consult the individual syntax reference for the DOM to determine whether or not names are required to be unique. Though it is not shown in these examples, the template element can take a name attribute. Despite this the template element is not nameable, because it is a top-level packet wrapper. The name attribute in this one case only merely holds a human-readable description of the template. The template object must always be referenced using xfa.template or $template.
Transparent Nodes
When an explicitly nameable object is left unnamed, it is invisible to the normal SOM syntax. Such unnamed objects are called transparent. In the following example, the receipt template is changed to omit the name attribute from the detail subforms.
In the above example, the Description field for the first detail subform is referenced in the Form DOM as:
$form.Receipt.Description[0]
while the Description field in the second detail subform is referenced as:
$form.Receipt.Description[1]
and
$template.Receipt.Description[1]
It is as though the nameless subform was removed and its children adopted by the nameless subform's parent. This has the side-effect of making fields into siblings that would not otherwise be siblings. For the Total_Price fields all three become siblings for purposes of SOM expressions even though they are physically at different levels in the tree. Nameless template and form objects cannot partake in the full set of functions that named objects partake in. Rather, nameless subforms are usually inserted simply to wrap around another object in order to lend the subform's richer capabilities to the enclosed object. For example, fields do not have occur properties but subforms do. As a result, it is normal to wrap a field inside a nameless subform in order to place the field under the influence of an occur property. Similarly, nameless exclusion groups are mere wrappers around sets of fields; the actual data values belong to the fields, not to the nameless exclusion group. In the same way, all nameless template and form objects are second-class objects, of interest to the form creator but not corresponding to data or to anything visible. The SOM expression resolver makes them transparent because it is convenient to be able to insert or remove such second-class objects without being forced to modify scripts.
Within a SOM expression the document variable CompanyName is referred to using the SOM expression:
$template.Receipt.CompanyName
The transparency of the variables object makes document variables easy to refer to within scripts when using a more advanced type of SOM expression, as explained below in Relative References on page 95
Reference by Class
There is a special syntax which can be used to reference all objects, whether they are transparent or not. The syntax is "#class", where class is the name of the object class. In most cases for objects which can be expressed in XML the name of the object class is the same as the tag for the associated element. For example, the second detail subform object in the template on page 82 can be referenced as
$template.Receipt.#subform[1]
Note: When an index is used with the "#class" syntax, the index refers to all occurrences of true siblings of that class, whether they are transparent or not. Explicit naming is available as an option in the Data DOM. However, in the Data DOM, the element tag is taken as the name by default, but may be overridden by the content of an attribute. Thus, nodes in the Data DOM always have names, one way or the other. See the XFA Names on page 63 for a description of the explicit naming option and how to invoke it. Consequently the "#" syntax is not usually needed for nodes in the Data DOM. One case in which it is needed is when the element tag contains characters that are not allowed in the names of objects by the scripting language. For example, FormCalc does not support object names containing a minus ("-") character. If such an element is loaded into the Data DOM without mapping the name to something else (another load option), the resulting dataGroup or dataValue object cannot be referenced using the usual syntax. In such a case, it is necessary to use #dataGroup or #dataValue, respectively. The "#class" syntax can also be used for objects that cannot be explicitly named, although it is redundant. For example, consider the following configuration information.
Attributes
Attributes are accessed using the same syntax as elements. Instead of the element tag/object class use the attribute name.
In the example the dataDescription attribute of the wsdlConnection named ShoppingCart can be referenced using the SOM expression:
$connectionSet.ShoppingCart.dataDescription
XML forbids more than one occurrence of a particular attribute per element, so it is never necessary to use array-subscripting when referring to attributes. The Data DOM does not by default load attributes, but there is an option to load attributes. See Creating, Updating, and Unloading a Basic XFA Data DOM on page 109 for more information about loading attributes into the Data DOM. Using the same syntax for child references and attributes raises the spectre of name clashes. See Name clashes on page 86 for more information.
<field name="Sub_Total" > <event action="click"> <script> if ($event.shift) then $host.setFocus(xfa.resolveNode("$form.Receipt.Tax")) endif </script> </event> </field> </field>
Some nodes have properties that may or may not correspond to an XML element or attribute. For example, every subform and field has a locale property. When expressed in XML the corresponding element may not have a locale declaration because it may inherit the locale of its parent subform. It is expected that when an XFA application writes out data as XML it will eliminate redundant locale declarations where possible. Nonetheless, to make scripting easier, every node in the Data DOM presents a locale property. Hence the locale for the Tax element in the receipt example can be referenced as:
$form.Receipt.Tax.locale
It is beyond the scope of this specification to describe the properties possessed by different nodes in different DOMs. For that information consult the scripting reference and the individual reference for each DOM.
Name clashes
Name clashes can occur between names explicitly assigned via a name attribute and names automatically generated from element tags, attributes, or internal properties. The ".#" syntax can be used to resolve such name clashes. This example contains name clashes between two attribute names and the names explicitly assigned to child elements.
The expression
$template.Detail.x
returns the attribute x on Detail, which has a value of 7.76mm. In the next example, the subform has a name attribute which is set to Detail. However it also contains a field element which is explicitly named name.
returns the value of the field named name, which is Ernest, because XFA SOM resolves the name clash in favor of the explicit naming of the field, rather than the automatic naming of the subform's attribute. To access the name attribute of Detail, use ".#name".For example,
$template.Detail.#name
returns the value of the property name on the Detail subform which is the string Detail. More usefully, the same trick works with an object pointer. Suppose the script contains a variable mycontainer which points a container in the Form DOM. The value of the containers name property can reliably be determined using the SOM expression
mycontainer.#name
could return a pointer to a node which is a child of mycontainer and itself has a name property of name. Note that there is no way to disambiguate clashes between attribute names and child element tags or internal properties. XFA schemas, such as the template schema, are constructed in such a way as to prevent such clashes. User data cannot be so constrained. Instead, in the Data DOM the situation is handled by treating attribute values as just another type of content, so that array-subscripting can be used to select the desired node. For example, assume attributes are being loaded into the Data DOM and the data is as follows.
In the Data DOM this is handled by creating three separate nodes which are siblings. The first node (eldest sibling) represents the Detail attribute with the value Acme. The second node (middle sibling) represents the first Detail element. The third node (youngest sibling) represents the second Detail element. Hence either of the expressions
$data.Receipt.Detail $data.Receipt.Detail[0]
resolves to the node representing the first of the two Detail elements, and the expression
$data.Receipt.Detail[2]
resolves to the node representing the second Detail element. This behavior is unique to the Data DOM. For more information, see Exchanging Data Between an External Application and a Basic XFA Form on page 109.
When the above data (Example 3.21) is loaded into the Data DOM, the expression
$data.Receipt.*
by default yields seven nodes corresponding to all of the elements which are direct children of the Receipt element. With the same data, the expression
$data.Receipt.*.Total_Price
yields two nodes corresponding to the Total_Price elements contained within Detail elements. The Total_Price element that is a direct child of Receipt is excluded because it there is no node in between it and Receipt, hence nothing that matches ".*". Again with the same data, the expression
$data.Receipt.Detail[0].*
by default yields four nodes corresponding the elements enclosed within the first Detail element. The default behavior is that attributes are not loaded into the Data DOM. However if attributes had been loaded there would have been an additional node, representing the PartNo attributes on the Detail
element, included in the set. See Basic Data Binding to Produce the XFA Form DOM on page 159 for more information about loading of attributes into the Data DOM.
yields the two Detail nodes which are children of the Receipt node. The set does not include their sibling Page, Sub_Total, Tax, and Total_Price nodes.
yields the the single Detail node which its the Total_Price property set to 250.00. An exactly equivalent SOM expression can be written using FormCalc syntax:
$data.Receipt.Detail.[Total_Price > 200]
By contrast either
$data.Receipt.Detail.(Total_Price.rawValue < 200)
or
$data.Receipt.Detail.[Total_Price < 200]
yields the single Detail node which has its Total_Price property set to 60.00. Finally, either
$data.Receipt.Detail.(Total_Price.rawValue < 1000)
or
$data.Receipt.Detail.[Total_Price < 1000]
yields both Detail nodes. If an error is encountered while evaluating the expression the error condition is processed immediately without evaluating the expression against any more siblings. Predicates are often used in the ref subproperty of a fields bind property. This makes it possible to make a field bind to data conditionally upon the value of the data. Note, however, that once the binding has been made the predicate is no longer consulted. Hence this is not suitable for interactive applications, where the user may change the value, unless a validation script is also provided to force the data to remain within the predicate range. Of course this is not a problem in non-interactive applications such as report generation. For example, the receipt form could be modified to generate a report that differentiates between items above a certain price (which require a managers approval) and items at or below that price (which are discretionary). The predicate for items below the threshold price includes a < character, which is written < in accordance with the rules of XML.
You cannot use a predicate directly in the body of a script as part of a normal object reference. Instead you must pass the complete SOM expression as a string to either a resolveNode() or resolveNodes() method. For example, a script could calculate the sum of items above a certain price as follows.
</calculate> </field>
Caution: Attempting to use a predicate as part of a normal object reference will result in a syntax error. As a rule of thumb, SOM expressions containing predicates must always be within quotation marks.
is equivalent to
$data.Receipt.Tax
This facility works in any DOM but is much more useful when used with unqualified references in the Form DOM. The xfa object also has a parent property, but its value is null.
$data..Total_Price $data..Total_Price[0]
resolve to $data.Receipt.Detail[0].Total_Price, the first matching node in document order. The value of this node is 250.00. Note that once this first match is found, the SOM expression resolver does not look at any other branches of the SOM. In particular, the expression $data..Total_Price[1] does not match any node, because there is no node corresponding to $data.Receipt.Detail[0].Total_Price[1].
SOM only
A SOM-only expression is used as the argument for the resolveNode() function or method or as the value of the ref property of a bind element.
Dash. The dash character is interpreted as part of the field name, rather than as an operator. This is true for both FormCalc and JavaScript.
Period. One or more escape characters must be used to distinguish a period used in a name from a period used as an object separator.
or
JavaScript strips one of the escape characters before passing the remaining string to the SOM resolver, but FormCalc does not. Without the rawValue property in the JavaScript expression, the object My.childs-toy would be returned rather than the value of the object, as explained in Using SOM Expressions in JavaScript on page 94
yields not the Units node but rather its value, which is 5. Similarly the expression
sum($data.Receipt.Detail.Total_Price[*])
specifies a list of field nodes, but when the sum() function processes each node in the list it looks up the value property of the node and adds together these numbers.
$xfa.resolveNode(My_String)
There is also a resolveNodes() method that returns a list of zero or more object references. For example:
sum($xfa.resolveNodes(My_String))
All nodes in all XFA DOMs have resolveNode() and resolveNodes() methods. Furthermore, for the types of SOM expressions described under Basic Object References on page 78, the resolveNode() or resolveNodes() method of any node can be used. However for the advanced expressions described in Relative References on page 95 you must use the methods of the $xfa object or the "$" object.
Within an XFA processor the same field content may be represented in several different formats. The above expression using rawValue returns the field content in canonical format. This is the format that is suitable for calculations. The same data may be presented to the user differently through the lens of a picture clause and/or localization. For more information about the different representations of the data see Localization and Canonicalization on page 139. The above example can be modified to return the formatted value, which is the format seen by the user, as follows:
$form.Receipt.Detail.Tax.formattedValue
In contrast, when FormCalc evaluates the expression $data.Receipt.Detail.Tax it returns the data in canonical form without having to be told to. Note: Versions of this specification prior to version 2.5 erroneously stated that the value property was equivalent to the rawValue property. In fact the value property corresponds to the value element which is a child of field and in JavaScript a SOM expression using this name evaluates to a node.
To address this limitation, JavaScript scripts must pass such SOM expressions as strings to a resolveNode() method. resolveNode() returns the object specified in the SOM expression. Every node in any of the XFA DOMs has a resolveNode() method. Furthermore, for the types of SOM expressions described under Basic Object References on page 78, the resolveNode() method of any node can be used. However for the advanced expressions described in Relative References on page 95 you must use the methods of the $xfa object or the current container (which is accessible as the this object). For example, the following line of code is valid:
$data.Receipt.Tax.rawValue = 11.34; // this is valid JavaScript
Whereas the following line of code is not valid because the square brackets are not allowed:
$data.Receipt.Detail[1].Units.rawValue = 3; // this is NOT valid JavaScript
Sometimes an operation expects or requires a list of objects, rather than a single object. For these cases the script must use the resolveNodes() method instead of the resolveNode() method. The resolveNodes() method returns a list of zero or more objects,sorted in document order. For example, the following expression creates a variable containing a list of zero or more dataValues corresponding to Units elements of receipt detail records.
// A valid JavaScript expression var aList = $xfa.resolveNodes("$data.Receipt.Detail[*].Units");
As with the resolveNode() method, there is a resolveNodes() method on every node in any XFA SOM, but only the methods on $xfa and the current container handle relative SOM expressions.
Relative References
Whenever a script is activated it resides somewhere in the Form DOM. It originated in the Template DOM, from which it was copied, but the copy in the Template DOM is never activated. Scripts do not reside in any other DOMs. The node containing the script provides a context for the script. Scripts can employ SOM expressions that reference nodes in the Form DOM relative to the node which contains the script. This facility is extended with scoping rules which allow the relative reference to succeed even if it does not exactly match the hierarchy of nodes in the Form DOM. When data is merged with a template to create the Form DOM, some parts of the Template DOM (including scripts) may be replicated more than once in the Form DOM. This allows a template to dynamically adapt to the number and arrangement of records in the data. But this imposes upon scripting
the requirement that a script be able to work unchanged even when it is not in the same position in the Form DOM that it was originally in the Template DOM. In other words, it must be possible to write scripts that are relocatable. This can be accomplished using relative references and scoping.
In XFA SOM, the default current object for a script is the container that is the most immediate ancestor of the script element. Most often such containers are field objects. In addition exclGroup, subform, and subformSet objects can be the current object for scripts. The other containers cannot contain scripts except inside contained field, exclGroup, subform, or subformSet objects. When a SOM expression contains a predicate, the predicate is effectively a small script. Within this script the current container is the node selected by the part of the SOM expression to the left of the predicate. The current object can be explicitly referenced using the dollar sign, "$". This serves the same purpose as this in JavaScript or Me in VBScript. In the following example of an XFA SOM expression embedded in a script, the current object is the Receipt subform, the most immediate ancestor that is a container. This script performs a subform-level validation when the user tabs out of the Receipt subform. The validation script uses "$" to make a relative reference to the value of the Tax field, highlighted in bold.
In the example above, the full name of the referenced object is $form.Receipt.Tax (the root subform is transparent because it is nameless).
For scripts written in JavaScript, the name of the current container is this in native JavaScript expressions but "$" in SOM expressions. The following shows the same validation as Example 3.29, modified to use JavaScript.
In the example the script uses this inside a native JavaScript expression to refer to the current container. Instead of this it could have named the current container explicitly, but it must name the correct container! For example, the example could have used the expression:
$form.Receipt.Tax.rawValue >= 0 // JavaScript
Or, the script could have used the resolveNode() method on the current container or on the $xfa object. Note: The resolveNode() method always uses "$", not this, regardless of the scripting language. Hence if this example is changed to use resolveNode() on $xfa it employs the following syntax:
$xfa.resolveNode("$.Tax").rawValue >= 0 // JavaScript
All nodes in all XFA DOMs have resolveNode() and resolveNodes() methods. Furthermore, for the types of SOM expressions described under Basic Object References on page 78, the resolveNode() or resolveNodes() method of any node can be used. However for relative expressions you must use the methods of either the $xfa object or of the scripts current container.
The SOM expression Tax does not start with "xfa" or any of the shortcut strings so it is taken to be the name of a child of the current object. The full name of the referenced object is $form.Receipt.Tax. In the example above, the following SOM expressions are equivalent:
Tax $.Tax $form.Receipt.Tax $xfa.resolveNode("Tax") $xfa.resolveNode("$.Tax")
The ability to refer to siblings with unqualified SOM expressions makes it possible to write relocatable SOM expressions. In the following example the same script is used for calculations in both of the Detail subforms.
This in turn makes it possible to eliminate the redundant subform declaration in the template. The two subforms can be coalesced into a single subform with an occurrence number of 2. The resulting template is as follows.
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<subform name="Receipt" layout="tb" > <subform name="Detail" > <occur min="2" max="2" /> <field name="Description" > </field> <field name="Units" > </field> <field name="Unit_Price" > </field> <field name="Sub_Total" > <calculate> <script>Units * Unit_Price</script> </calculate> </field> </subform> </subform> </template> </xdp:xdp>
When data is merged into the form, the XFA application automatically incorporates two copies of the Detail subform into the Form DOM. See Dynamic Forms on page 291 for more information about templates for dynamic forms, and Basic Data Binding to Produce the XFA Form DOM on page 159 for more information about how occurrence numbers affect the merge process. The Receipt subform uses a top-to-bottom flowing layout strategy so that successive instances of the Detail subform are placed into successive content regions. See Layout for Growable Objects on page 242 for more information about the layout process for dynamic forms.
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The same script still works because Units and Unit_Price are both siblings of New_Subform, which is an ancestor of Sub_Total, which is the container for the script. Note that this does not work in the other direction. Ancestors can be referred to directly but not descendants beyond immediate children. Starting again with the template from Example 3.33, if a new subform is wrapped around Units and Unit_Price, it is necessary to modify the script that calculates Sub_Total as follows.
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script container. Thus it escapes scope-matching without giving up relocation. For example, consider the following template.
the expression $.Total_Price resolves unambiguously to $form.Receipt.Detail.Total_Price. Scope-matching does not apply hence the expression does not resolve to the same-named field $form.Receipt.Total_Price.
"$" can also be used for expressions pointing to nodes that are higher up in the hierarchy than the script's container. Use "$.parent", "$.parent.parent", and so on to climb levels in the tree. It is possible to climb all the way to the root. The equivalent syntax for native JavaScript expressions is "this.parent", "this.parent.parent", and so on.
Inferred Index
The previous sections have used as examples a template that is divided up into individual subforms for each detail record. Conceptually such a template is arranged in a tree structure. However it is also possible to create templates that are notionally arranged in a matrix, like a spreadsheet. For example, consider the following receipt template with room for multiple items.
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<field name="Units" > </field> <field name="Unit_Price" > </field> <field name="Total_Price" > </field> <field name="Description" > </field> <field name="Units" > </field> <field name="Unit_Price" > </field> <field name="Total_Price" > </field> </subform> </template> </xdp:xdp>
Instead of grouping the fields by subform, this static template simply repeats each of the Description, Units, Unit_Price, and Total_Price fields five times. Most likely these are arranged on the page as a matrix four fields wide and five lines high, in imitation of a traditional pre-printed paper form. SOM expressions provide a mechanism to deal conveniently with such arrangements. When scope-matching, if an unqualified reference is made without specifying an index, the index of the container is also used for the unqualified reference. For example, the above template can be modified by adding scripts as follows.
When each script is activated, the index used for Units and for Unit_Price are inferred from the Total_Price that contains the script. Therefore Total_Price[0] is calculated as Units[0] * Unit_Price[0], Total_Price[1] is calculated as Units[1] * Unit_Prices[1], and so on. This way the same script can be replicated in different cells without having to edit it for each cell. To take advantage of inferred indexing in JavaScript you must use the resolveNodes() method. The equivalent of the above scripts in JavaScript is:
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It is possible to design a form where the size of the array of referencing fields is not the same as the size of the array of referenced fields. In such a case matching is still attempted by index number. So, if the reference falls within the range of referenced fields, a match is found. If it falls outside, it is an error. For example, if three of the Units fields were deleted from the above example, so that it had five Total_Price fields but only two Units fields, the calculations for Total_Price[2], Total_Price[3], and Total_Price[4] would fail. The same calculations fail regardless of which three of the Units fields were deleted, because SOM expression indexes refer to occurrence count rather than position on the page. It is generally not a good idea to use this sort of construction unless the fields, subforms, and/or exclusion groups involved form congruent arrays. There is one exception to this rule. If a script in a container with multiple same-named siblings makes reference to a singly-occurring node with no explicit occurrence indication, that single occurrence is always found. For example, all instances of the Total_Price field here refer to a singly-occurring Discount field.
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shows estimated travel times between the same cities in hours. The content of each cell in the second table is calculated based upon the corresponding cell in the first table. The template is as follows.
/ Speed</script>
/ Speed</script>
/ Speed</script>
/ Speed</script>
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Each cell in the Timetable looks up the corresponding distance in the Distance table using the SOM expression Distance.Distances.Cell. Consider the case of the calculate script for the field $template.Trip.Time.Times[3].Cell[2]. The expression Distance.Distances.Cell is resolved as follows: 1. The current container is a field named Cell, specifically $template.Trip.Time.Times[3].Cell[2]. The Cell field does not have a property or child named Distance. 2. The Cell field's parent is a subform called Times, specifically $template.Trip.Time.Times[3]. The Times subform is not named Distance nor does it have a sibling named Distance. 3. The parent of Times is a subform called Time, specifically $template.Trip.Time. Time has a sibling called Distance. Hence Distance is resolved to $template.Trip.Distance. 4. $template.Grid.Distance has multiple children called Distances. The SOM expression does not supply an index. Hence an index must be inferred. Inferring is possible because the corresponding node on the way up the tree, $template.Trip.Times.Times[3], has an index. Its index is borrowed and $template.Trip.Distance.Distances[3] is selected. 5. $template.Trip.Distance.Distances[3] has multiple children called Cell. The SOM expression does not supply an index. Hence, an index must be inferred. Inferring is possible because the corresponding node on the way up the tree, $template.Trip.Times.Times[3].Cell[2], has an index. Its index is borrowed and $template.Trip.Distance.Distances[3].Cell[2] is selected. 6. Because the script language is FormCalc, and a string is required by the context, and $template.Trip.Distance.Distances[3].Cell[2] has an associated value, the expression is resolved to $template.Trip.Distance.Distances[3].Cell[2].rawValue. Note that when it comes to inferring an index it makes no difference whether or not a particular node on the way up has the same name as the corresponding node on the way down. Hence the tables do not have to match by name, they only have to be congruent (i.e. have the same dimensions). The SOM expression Speed is easier to resolve because it does not need an index. 7. By the usual scoping logic Speed is resolved to the field $template.Trip.Speed. Because that field has no siblings with the same name, no index is required. 8. Because the script language is FormCalc, and a string is required by the context, and $template.Trip.Speed has an associated value, this expression is further resolved to $template.Trip.Distance.Distances[3].Cell[2].rawValue. Finally the calculation can be done. 9. The number in $template.Trip.Distance.Distances[3].Cell[2].rawValue is divided by the number in $template.Trip.Speed.rawValue and the quotient assigned to $template.Trip.Time.Times[3].Cell[2].rawValue. It is possible for the SOM expression to reach down to a lower level than the level of the script's container. In that case, when the SOM expression does not specify an index and an index is required, [0] is assumed. The same thing happens when the script's container does not have siblings of the same name. In short, when an index is needed but none is supplied and there is no way to infer an index,[0] is used.
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Index inferral must not be combined with the use of ".parent" in the same SOM expression. The SOM expression resolver is not required to correctly handle the inferral when the SOM expression contains ".parent". Index inferral may be used with references by class. For example consider the following template.
the expression B.#subform.Y resolves to $form.root.B.#subform[1].Y, which is to say the field named Y within the second child of subform B. The index "[1]" is copied from the corresponding level in the current object's full name, which is expressed as $form.root.A.#subform[1].X. Note that the current subform and/or the referenced subform may be named, as shown, but even when they are the names have no effect on the resolution of the expression.
Relative Index
Sometimes it is necessary for a script associated with one cell in an array to refer to another cell on another line above or below. A special syntax is provided for this. Within an unqualified reference an index of the form "[-nnn]" is interpreted as the current container's index minus nnn, while an index of the form "[+nnn]" is interpreted as the current container's index plus nnn. For example, in the following example an item number field has been added to each detail record. This example is based upon the spreadsheet-style template of Example 3.38 so all of the Item_No fields are siblings. The first Item_No field defaults to 1. Each remaining Item_No field automatically calculates its value as one more than the previous Item_No field. Furthermore, if the user manually enters a value into the first Item_No field all subsequent item numbers are automatically updated.
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<value> <integer>1</integer> </value> </field> <field name="Description" > </field> <field name="Units" > </field> <field name="Unit_Price" > </field> <field name="Total_Price" > </field> <field name="Item_No" > <calculate> <script>Item_No[-1] + 1</script> </calculate> </field> <field name="Description" > </field> <field name="Units" > </field> <field name="Unit_Price" > </field> <field name="Total_Price" > </field> </subform> </template> </xdp:xdp>
Relative indexing can also be used with inferred indexes. Relative indexes are defined as relative to the unadorned reference. Hence the full meaning of "[-nnn]" is "indexed by nnn less than what it would have been if [-nnn] had not been specified". Similarly the full meaning of "[+nnn]" is "indexed by nnn more than it would have been if [+nnn] had not been specified". Relative indexing cannot be used in fully-qualified SOM expressions because such expressions cannot infer indexes.
Creating, Updating, and Unloading a Basic XFA Data DOM explains how mapping rules influence where data in the XML Data DOM is placed in an XFA Data DOM, how the XML Data DOM is updated when data in the XFA Data DOM changes, and how data in the XML Data DOM is unloaded. Localization and Canonicalization explains the role locale plays when data is being loaded into or out of an XFA Data DOM or Form DOM. Basic Data Binding to Produce the XFA Form DOM explains how containers in the Form DOM are bound with data in the XFA Data DOM.
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representation of data. Data expressed in XML can be manipulated via off-the-shelf, and often freely available, processing tools; in the worst case the data can be manipulated using a common text editor. Hence, it would be contrary to this inherent property of XML to require that data conform to a specific grammar or schema before it can be used within an XFA processing application.
How data is represented in an XFA data document object model (DOM), how the tree structure of such a DOM aids data organization, how data within the Data DOM is identified Relationship between the XFA Data DOM and the XML Data DOM, and how this can simplify your implementation Notation used to represent data
XML DOM
Data DOM
The XFA Data DOM provides a set of software interfaces to the data mapped from an XML data document. In principle, the same model could also be used to represent data from non-XML sources such as a database or other data formats such as comma-separated values. The XFA Data DOM provides interfaces that are simpler than a generic XML Document Object Model [XMLDOM2]. There are fewer interfaces in the XFA Data DOM as compared to the XML DOM, and many of the physical structures of XML are abstracted away. Notwithstanding the wider applicability of the XFA Data DOM, this specification assumes that the XML data document is first loaded into an XML Data DOM and from there into the XFA Data DOM. The XFA Data DOM encloses a tree structure in which each node is either a dataValue object or a dataGroup object. In most cases nodes correspond to individual XML elements and are peered with individual nodes in the XML Data DOM. Parent-child relationships correspond to element nesting relationships, that is, the element corresponding to the parent of any given node contains the element corresponding to the given node. In addition the children of any node are ordered by age, that is the first child acquired by the node is the eldest, the next child acquired is the second-eldest and so on. In XFA
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specifications when a tree is drawn pictorially sibling nodes are shown in order by age, with the oldest at the left and the youngest at the right. In the case of the XFA Data DOM the result of this ordering is that a tree walk that goes in depth-first order, and left-to-right at any level, traverses the data in the same order as it was present in the original XML data document. The objects in the XFA Data DOM and their properties are exposed via the XFA Data DOM interfaces. Every object in the XFA Data DOM has the following exposed property: Property
name
Description A string of any length (including zero-length, that is empty) which is a non-unique identifier for the object. This corresponds to the local part of either the element type or the attribute name in the XML data document.
In addition, each object created by the data loader has an internal pointer to the node in the XML Data DOM with which it is peered. Furthermore, some objects have additional properties appropriate to their object types, as described below. For example, consider the following fragment of XML.
Example 4.1
<abc:tree xmlns:abc="http://www.example.org/orchard/">apple</abc:tree>
When loaded into the XFA Data DOM using default mapping rules, the dataValue node representing this data has a property called name with a value of tree. After the XFA Data DOM has been loaded the XFA application may update it. Updates may include adding, deleting, moving, and changing the properties of nodes. These changes are passed through to the XML Data DOM by the XFA Data DOM so that the two data DOMs stay synchronized. When the data unloader runs it creates the new XML data document based upon the contents of the XML Data DOM, as updated by the application. Note that the exposed properties may be set by an XFA application to any Unicode string, including the empty string "". This allows XFA applications to construct arbitrary data structures. However the XML 1.0 Specification [XML] imposes additional restrictions upon element types, namespace prefixes, and URIs. Hence when the XFA Data DOM is unloaded to an XML data document the result may be malformed XML. It is up to the application to ensure, if desired, that the restrictions of XML with regard to element types, namespace prefixes and URIs are respected. The XFA Data DOM is part of a larger tree that holds all exposed XFA nodes. The single large tree makes it possible to refer to XFA nodes using a unified format known as a Scripting Object Model (SOM) expression. The grammar of SOM expressions is described in Scripting Object Model on page 74. Briefly, an expression consists of a sequence of node names separated by periods ("." characters). Starting from some point in the XFA tree, each name identifies which child of the current node to descend to. The Data DOM descends from a node named data which is a child of datasets, which is a child of xfa, which is the root. The XML data document does not supply the xfa, datasets, or data nodes; instead the data loader creates them automatically and makes the node mapped to the outermost element of the data the child of data. Consider the following XML data document.
Example 4.2
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When loaded into the XFA Data DOM, the node representing the book element would be referenced by the SOM expression "xfa.datasets.data.book". The ISBN element would be referenced by "xfa.datasets.data.book.ISBN" and the title element by "xfa.datasets.data.book.title". Also, SOM expressions recognize the short-form "!" as equivalent to "xfa.datasets." and "$data" as equivalent to "xfa.datasets.data". Thus for example the title element above could also be referenced as either "!data.book.title" or "$data.book.title".
dataValue Nodes
A dataValue node is an object in the XFA Data DOM that corresponds to an element holding character data (and possibly other elements) in an XML data document. Within the XFA Data DOM leaf nodes are usually dataValue nodes. A dataValue node can have other dataValue nodes descended from it but it can not have any dataGroup nodes descended from it.
dataValue nodes have the following properties:
Property
contains contentType
Description A string identifying the source of the data. The string is set to metadata if the value property originated from an XML attribute, but to data if it did not. A string identifying the type of the data. By default this is set to the empty string (""). The empty string is interpreted as equivalent to text/plain. Note however that the treatment of text/plain in XFA is more relaxed than that specified in [RFC2046] for the MIMEtype text/plain. The difference is that in XFA the data loader may recognize a line break signified by a newline character (U000A) without an accompanying carriage-return character (U000D). A Boolean flag which is true if and only if the value of the data is null. Note that there is no simple way to detect null values other than by inspecting the isNull property, because the syntax defined by [XML Schema] allows an element to be explicitly declared null using the xsi:nil attribute even though the element contains data. Hence, a data node may contain data yet isNull may be 1. When this occurs the correct behavior is to treat the value of the data node as null, on the grounds that explicit markup should override an implicit property. However when such a data node is unloaded to a new XML data document the value should be written out along with the xsi:nil attribute so that round-tripping preserves the original document as far as possible. A string of Unicode characters holding the data associated with the node. The string may be of any length (including zero-length, that is empty). The string must not include the character code NUL (U0000). Hence, NUL may be used as the string terminator by XFA applications.
isNull
value
A dataValue node has the standard properties such as name plus the properties listed in the above table. These properties are exposed to scripts and SOM expressions. In addition, for illustrative purposes in this chapter, we will think of a dataValue object as having a fictional property called nullType. This fictional property records the manner in which a null value was
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represented in the XML data document from which it was loaded, and controls how it will be represented in the new XML data document when it is unloaded. This property takes one of three values. The value xsi means that a null value is represented by an xsi:nil attribute as defined in [XML Schema]. The value empty means that an empty value is represented by an empty element. The value exclude means that an empty value is represented by a missing element or attribute. Note that the first two values (xsi and empty) are only available for data nodes representing elements. For data nodes representing attributes the value of this property is always exclude. In the following fragment of XML, the elements ISBN, title, desc and keyword all represent data values.
Example 4.3
In the above example, the element ISBN is represented by a dataValue node with a name property of ISBN, a value property of "15536455", and a contains property of data. The element title is represented by a dataValue node with a name property of title, a value property of "Introduction to XML", and a contains property of data. When loading the value property, the data loader removes XML escaping, so that for example if the XML data contains the XML entity < this is represented in the value string as "<" rather than by the XML entity. The XML data document must not contain character data containing either a NUL character (U0000) or any escape sequence that evaluates to zero, for example "�".
dataValue nodes are permitted to be descended from other dataValue nodes in order to represent XML mixed content. The following example shows mixed content.
Example 4.4
The element keyword in the above example is represented in the XFA Data DOM by a dataValue node which is the child of the dataValue node representing the element desc. Note that the value of a dataValue node is the concatenation of the values of its child dataValue nodes. For instance, in the case of the desc data value above, the value is "Basic primer on XML technology."; the XML portion of the value is contributed by the keyword data value to its parent desc data value. The resulting data values have the properties: Name
ISBN title desc keyword
Value
"15536455" "Introduction to XML" "Basic primer on XML technology." "XML"
Contains
data data data data
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This process of the parent incorporating the childs value is recursive to any number of levels. When a lower-level value changes all of the higher-level values incorporating it automatically change as well. XML attributes are also by default treated as data values. Those dataValue nodes that result from mapping of XML attributes are marked as a different flavor of dataValue node. Such nodes resulting from attributes for the purpose of this specification are said to represent metadata. One benefit of this approach is the potential to place the values of these nodes back into attributes when unloading the XFA Data DOM into an XML data document. Attributes may be prevented from loading by a configuration option as described in "The attributes Element on page 438".
dataValue nodes that are considered to contain metadata are excluded from the value of any ancestor dataValue node. Consider the following XML data fragment that extends the previous example with the addition of a language attribute on the desc element.
Example 4.5
<book> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <desc language="english" >Basic primer on <keyword>XML</keyword> technology.</desc> </book>
In the above example the value property of the desc dataValue node is "Basic primer on XML technology." regardless of the presence of the language attribute and its corresponding dataValue node. The content of the data value element keyword contributes to the value of desc, but the content of the attribute language does not contribute. Hence the dataValue nodes resulting from this example have the properties listed in the following table. The only difference from the preceding example is the addition of a new dataValue node representing the attribute: Name
ISBN title desc keyword language
Value
"15536455" "Introduction to XML" "Basic primer on XML technology." "XML" "english"
Contains
data data data data metadata
In many cases it is useful to distinguish between a data value which is empty (zero-length) and a data value which was never entered. For example, suppose a form has ten fields into which the user may enter numbers. The form is required to calculate and display the average of the numbers in the fields. However, the user enters only six numbers, leaving four fields null. If the calculation simply adds all ten fields together and divides the result by ten, it will treat the four null fields as zeroes and get the wrong answer. Instead it needs to count and sum just the non-null fields. The easiest way to do this is to use the isNull property of the dataValue node associated with each field.
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dataGroup Nodes
A dataGroup node is an object in the XFA Data DOM that corresponds to an element holding other elements (as opposed to character data) in an XML data document. Within the XFA Data DOM interior nodes are usually dataGroup nodes. A dataGroup node may have other dataGroup nodes and/or dataValue nodes descended from it. Note however that while a dataValue node can descend from a dataGroup node, a dataGroup node can never descend from a dataValue node. Some XML data documents enclose repeating sets of data, with the same or similar structure but with different content. This specification refers to these repeating sets of data as records. The outermost element of a record must map to a dataGroup node.
dataGroup objects have the common properties such as name. These properties are exposed to scripts and SOM expressions. In addition, for illustrative purposes in this chapter, we will pretend that they have some fictional properties.
A dataGroup object can be thought of as possessing a fictional property called nullType. This fictional property controls the manner in which null values are represented in XML representations for data value nodes descended from this node. dataGroup nodes themselves do not have any value, null or non-null, so this property has no effect on the dataGroup node itself. This property is present purely so it can be inherited by the nullType properties of those dataValue nodes which are children of the dataGroup node. One can also think of a dataGroup object as possessing a fictional property called isRecord. In reality scripts determine whether a dataGroup is or is not a record by calling the isRecordGroup(NODE) method of the $dataWindow object. The isRecord fictional property represents the value that would be returned by this method if passed this dataGroup. In the following fragment of XML the element book represents a data group containing data values ISBN, title, desc, and keyword.
Example 4.6
In the above example the element book is represented in the XFA Data DOM by a dataGroup node with a name property of book. The dataGroup node may be a record or not depending on the context within the XML data document and depending on the configuration option described in The record Element on page 456. If the above text was the entire XML data document and default mapping rules were used, it would be a record. As described in dataValue Nodes on page 112 the ISBN, title and desc elements are represented by dataValue nodes in the Data DOM. Those nodes are all children of the dataGroup node representing the book element. The keyword element is also represented by a dataValue node but it is a child of the dataValue representing the desc element, hence a grandchild of the dataGroup node.
Relationship Between the XFA Data DOM and the XML Data DOM
After the XFA Data DOM has been loaded the XFA application may update it. Updates may include adding, deleting, moving, and changing the properties of nodes. These changes are passed through to the XML
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Data DOM by the XFA Data DOM so that the two data DOMs stay synchronized. When the data unloader runs it creates the new XML data document based upon the contents of the XML Data DOM, as updated by the application. Note that the exposed properties may be set by an XFA application to any Unicode string, including the empty string "". This allows XFA applications to construct arbitrary data structures. However the XML 1.0 Specification [XML] imposes additional restrictions upon element types, namespace prefixes, and URIs. Hence when the XFA Data DOM is unloaded to an XML data document the result may be malformed XML. It is up to the application to ensure, if desired, that the restrictions of XML with regard to element types, namespace prefixes and URIs are respected. Some data loader options cause the data loader to load only a subset of data from the XML Data DOM into the XFA Data DOM. The result is that the ignored data is still in the XML Data DOM but is not accessible through the XFA Data DOM. Consequently the XFA application is unable to alter the ignored data. When the data unloader writes out a new XML data document, since the ignored data has been kept untouched in the XML Data DOM, it is written out in the new document without significant1 changes. This applies to data which is always excluded from the document range as described in Document Range on page 118. It applies to data which is excluded using the extended mapping rules described in The excludeNS Element on page 439, The startNode Element on page 463, and The range Element on page 455. Finally, it applies to all extended mapping rules invoked by the ignore keyword, as described in The attributes Element on page 438, The ifEmpty Element on page 447, and The presence Element on page 453. The name property of a node in the XFA Data DOM may be altered by the application or by the data loader, but doing so does not affect the name property of the peered node in the XML Data DOM. Consequently the node in the XFA Data DOM is accessible to scripts under its new name, but when the peered node is written out from the XML Data DOM to a new XML data document it retains its original name. This applies to nodes renamed via the data-loading options described in The nameAttr Element on page 451 and The rename Element on page 462. On the other hand when the application creates a new node in the XFA Data DOM, there is no existing peer in the XML Data DOM, so one is created and given the same name property. The remaining data loader options cause the data loader to alter the content of the XML Data DOM along with the XFA Data DOM. When the data is unloaded the alteration is reflected in the new XML data document. This applies to extended mapping rules described in XSLT Preprocessing on page 469, The whitespace Element on page 465 and XSLT Postprocessing on page 469. It also applies to the rules invoked via the remove, dissolve or dissolveStructure keywords as described inThe presence Element on page 453, and The ifEmpty Element on page 447. Other updates by the XFA application carry through to the XML Data DOM. When updating any property other than name, and when deleting, inserting, or moving a node in response to a request from the XFA application, the XFA Data DOM propagates the update to the XML Data DOM. Moving a node can cause a name conflict if, for example, a data value containing an attribute (contains set to metadata) is moved to a location where there is already a peer representing an attribute with the same name. A similar situation can arise from a request to create a new node. Carrying out such a request would result in a structure that violates the linkage rules of the XML Data DOM. The XML Data DOM refuses to carry out such a request and the XFA Data DOM in response returns an error code to the XFA application and leaves the XFA Data DOM in a state consistent with the XML Data DOM.
1. The XML standard [XML1.0] defines some contexts in which certain content is not significant, for example whitespace preceding the closing ">" of a tag.
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Tree Notation
This specification illustrates the contents of an XFA Data DOM, using the DOM notation described Document Object Model Notation on page xi. This section provides examples that apply this convention to the XFA Data DOM. Data groups are expressed in the following form:
[dataGroup (name)]
where name represents the name property of the data group. Data values are expressed in the following form:
[dataValue (name) = "value"]
where name represents the name property of the data value, and value represents the value property. The contains property of a data value has a value of data unless some other value is explicitly shown. That is, it will only be expressed in this notation when it has a value of metadata, as described by the following two examples:
[dataValue (ISBN) = "15536455"]
In the above example the data value ISBN has a value property of "15536455" and, although it isn't explicitly stated by the notation, it also has a contains property of data.
[dataValue (status) = "stocked" contains="metadata"]
In the above example, the data value status has a value property of "stocked" and a contains property of metadata. Similarly, within this specification the contentType property of a data value has a value of the empty string ("") when not explicitly shown. Likewise the isRecord property of a data group has a value of false when not explicitly shown. Indenting is used to show parent-child relationships between nodes. In the following example a data group named book is the parent of a data value named ISBN:
[dataGroup (book)] [dataValue (ISBN) = "15536455"]
Within a group of sibling nodes, the age relationship is shown by the vertical ordering. The eldest child is at the top, the youngest at the bottom. In the following example ISBN is the eldest child of book, title is the middle child, and author is the youngest. Between the children of author, firstname is the older and lastname the younger.
[dataGroup (book)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"] [dataGroup (author)] [dataValue (firstname) = "Charles"] [dataValue (lastname) = "Porter"]
In some complex XML data documents the elements that correspond to data groups or data values may be annotated with an XML namespace [XMLNAMES]. In these cases, the namespace and, if present, the namespace prefix are shown in the notation used here even though they are not present in the XFA Data DOM itself. The notation is as follows:
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In order to not clutter each example with namespace information, only examples that depend upon namespace information will include this form of the notation. The prefix refers to a namespace prefix as described by [XMLNAMES]. The uri refers to the corresponding Uniform Resource Identifier as described by RFC2396: Uniform Resource Identifiers (URI): Generic Syntax [URI]. The isNull property and the fictional nullType property are not illustrated in the above examples. To avoid clutter they are only shown if the value of isNull is true. The value 1 is used to represent true. Similarly the fictional isRecord property is only illustrated where it is of interest and true. Again the value 1 is used to represent true. It is worth repeating that the above notation is provided only as means within this specification to depict the structure and content within an XFA Data DOM.
Document Range
The term document range refers to the portion of the XML data document that is processed by the data loader, such as the whole XML data document or a fragment. Assuming the XML data document starts as a file containing serialized XML, the first step in processing is to load the entire content of the XML data document into an XML Data DOM. The portion of the XML data document corresponding to the document range is then loaded into and accessible from the XFA Data DOM, and any portions of the data that are outside of the document range are not accessible via the XFA Data DOM. When the data unloader creates a new XML data document it stitches together the data within the XFA Data DOM and the data excluded from the XFA Data DOM (but still in the XML Data DOM) to create a new serialized XML file. The document range can be influenced via the use of a number of extended mapping rules, however there is a by default document range which is described in more detail in the following subsections. The document range is the portion of content corresponding to the intersecting result of applying the rules described by the following sections, in order. In other words, the mechanisms described by this section (and in the corresponding sections within the "Extended Mapping Rules on page 434") each excludes more content from the document range. The order that the data loader applies the rules is as follows: 1. XML Logical Structures: Constrain the document range to a limited set of XML logical structures. 2. Start Element: Additionally constrain the document range to the document content within a specified element.
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3. Namespaces: Additionally constrain the document range to a set of content belonging to a set of XML namespaces. 4. Record Elements: Partition the document range into records enclosed within specified elements.
elements with character data elements with element content elements with mixed content empty elements attributes
This means that XML processing instructions, for example, are not included in the document range.
Start Element
The notion of a start element represents the element where the XFA data handling processing begins, and consequently the end of the element determines where processing ends; the start element is a way to specify that a particular element within the XML data document actually represents the root of the document. By default the start element corresponds to the root element (also known as the document element) of the XML data document (see section 2.1 "Well-Formed XML Documents" of the XML specification [XML] for more information about the root element). Therefore, the data loader by default maps the content of the document beginning with the root element inclusively. The document range is constrained to a range of document content not greater than that specified by the start element. Consider the following XML data document, which holds data pertaining to a single order from a book store.
Example 4.7
<?xml version="1.0" contentType="UTF-8"?> <order> <number>1</number> <shipto> <reference><customer>c001</customer></reference> </shipto> <contact>Tim Bell</contact> <date><day>14</day><month>11</month><year>1998</year></date> <item> <book> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <author> <firstname>Charles</firstname>
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<lastname>Porter</lastname> </author> <quantity>1</quantity> <unitprice>25.00</unitprice> <discount>.40</discount> </book> </item> <item> <book> <ISBN>15536456</ISBN> <title>XML Power</title> <author> <firstname>John</firstname> <lastname>Smith</lastname> </author> <quantity>2</quantity> <unitprice>30.00</unitprice> <discount>.40</discount> </book> </item> <notes>You owe $85.00, please pay up!</notes> </order>
By default, the start element corresponds to the root element, which in the above example is the order element. The data loader by default maps the entire document, which results in the following mapping:
[dataGroup (order) isRecord="true"] [dataValue (number) = "1"] [dataGroup (shipTo)] [dataGroup (reference)] [dataValue (customer) = "c001"] [dataValue (contact) = "Tim Bell"] [dataGroup (date)] [dataValue (day) = "14"] [dataValue (month) = "11"] [dataValue (year) = "1998"] [dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"] [dataGroup (author)] [dataValue (firstname) = "Charles"] [dataValue (lastname) = "Porter"] [dataValue (quantity) = "1"] [dataValue (unitprice) = "25.00"] [dataValue (discount) = ".40"] [dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = "15536456"] [dataValue (title) = "XML Power"] [dataGroup (author)] [dataValue (firstname) = "John"] [dataValue (lastname) = "Smith"] [dataValue (quantity) = "2"] [dataValue (unitprice) = "30.00"] [dataValue (discount) = ".40"]
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In the above example the document range is the range of document content enclosed by the order data group element.
Namespaces
It is common for XML data documents to be comprised of content belonging to more than one namespace. The formal specification of XML namespaces is provided by the "Namespaces for XML" [XMLNAMES] specification. Namespace inheritance is described fully in the [XMLNAMES] specification. Briefly, each element or attribute that does not explicitly declare a namespace inherits the namespace declared by its enclosing element. A namespace is declared using a namespace prefix. The namespace prefix must be associated with a URI either in the element using the namespace prefix or in an enclosing element. The same rules apply to the XFA Data DOM except for namespaces that are reserved for XFA directives, as described below. The following example illustrates an XML document containing information about a purchase from a bookstore. The information is partitioned into two namespaces. The default namespace represents the order information needed by the bookstore for inventory and shipping purposes. The other namespace represents accounting information pertaining to the e-commerce transaction.
Example 4.8
<?xml version="1.0" encoding="UTF-8"?> <invoice xmlns:trn="http://www.example.com/transaction/"> <item> <book> <ISBN>15536455</ISBN> <title xml:lang="en">Introduction to XML</title> <quantity>1</quantity> <unitprice currency="us">25.00</unitprice> <discount>.40</discount> <trn:identifier>27342712</trn:identifier> </book> </item> </invoice>
The use of namespaces within an XML data document assists in the determination of data values and data groups, and can also exclude document content from data loader processing. The by default handling of namespaces is described in this section, and additional control over namespace processing is described in the section The excludeNS Element on page 439. The document range always excludes any document content as follows:
content belonging to the namespace "http://www.xfa.com/schema/xfa-package/" content belonging to the namespace "http://www.xfa.org/schema/xfa-package/"
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The data loader may have additional namespaces that it considers to be excluded from the document range: this behavior is implementation-defined. Note that some attributes, although excluded from processing as ordinary metadata, are nonetheless processed separately. Each data value node has an isNull property determining whether it holds a null value, which can be thought of as out-of-band processing of nil attributes in the "http://www.w3.org/2001/XMLSchema-instance" namespace. Furthermore, attributes belonging to the "http://www.xfa.org/schema/xfa-data/1.0/" namespace may affect processing by the data loader at load time but, in accordance with the rule above, are not included as metadata in the XFA Data DOM. Consider again the preceding example, Example 4.8. There is an invoice element that belongs to the default namespace and also includes an identifier element that belongs to the namespace "http://www.example.com/transaction/". The invoice element has an attribute which makes the "trn" prefix a synonym for the "http://www.example.com/transaction/" namespace. This declaration uses an attribute named "xmlns:trn", which according to the rule above is excluded from the document range. Although the declaration has its intended effect (associating subsequent data with the appropriate namespace) it is itself excluded from the document range. Similarly the xml:lang attribute of the title element is excluded by another of the rules above. To illustrate this, the following is the same example with the document range represented in bold type.
Example 4.9
<?xml version="1.0" encoding="UTF-8"?> <invoice xmlns:trn="http://www.example.com/transaction/"> <item> <book> <ISBN>15536455</ISBN> <title xml:lang="en">Introduction to XML</title> <quantity>1</quantity> <unitprice currency="us">25.00</unitprice> <discount>.40</discount> <trn:identifier>27342712</trn:identifier> </book> </item> </invoice>
The first element is also excluded from the document range, not on the basis of namespace but because it is an XML processing instruction, as described above in XML Logical Structures on page 119. The result of mapping this XML data document using the default mapping is as follows:
[dataGroup (invoice) isRecord="true"] [dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"] [dataValue (quantity) = "1"] [dataValue (unitprice) = "25.00"] [dataValue (currency) = "us" content="metadata"] [dataValue (discount) = ".40"] [dataValue (trn:identifier) = "27342712" xlmns="http://www.example.com/transaction/"]
The above example demonstrates the automatic exclusion of attributes having the xmlns prefix and of attributes having the xml namespace prefix.
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Record Elements
Some XML data documents enclose repeating groups of data, each with different content. This specification refers to these repeating groups of data as records. Typically a record holds the data from a single form instance. By default, the data loader considers the document range to enclose one record of data represented by the first (outermost) data group within the document range. Consider once again the book order shown in Example 4.7. The result of mapping this XML data document with default mapping rules is as follows:
[dataGroup (order) isRecord="true"] [dataValue (number) = "1"] [dataGroup (shipTo)] [dataGroup (reference)] [dataValue (customer) = "c001"] [dataValue (contact) = "Tim Bell"] [dataGroup (date)] [dataValue (day) = "14"] [dataValue (month) = "11"] [dataValue (year) = "1998"] [dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"] [dataGroup (author)] [dataValue (firstname) = "Charles"] [dataValue (lastname) = "Porter"] [dataValue (quantity) = "1"] [dataValue (unitprice) = "25.00"] [dataValue (discount) = ".40"] [dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = "15536456"] [dataValue (title) = "XML Power"] [dataGroup (author)] [dataValue (firstname) = "John"] [dataValue (lastname) = "Smith"] [dataValue (quantity) = "2"] [dataValue (unitprice) = "30.00"] [dataValue (discount) = ".40"] [dataValue (notes) = "You owe $85.00, please pay up!"]
In the above example the document range is the range of document content enclosed by the order data group element, and by default, is partitioned into a single record.
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</book>
In the above example the elements ISBN and title enclose character data. All such elements within the document range map to dataValue nodes with a name property corresponding to the local part of the element type (the name given in the element's start and end tags), and a rawValue property corresponding to the element content. The result of the mapping is as follows:
[dataGroup (book)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"]
The rules for mapping content of the XML data document into dataValue nodes are defined in the following sections.
the name property of the dataValue node is set to the local part of the element type (tag name) of the element the value property of the dataValue node is set to the character data of the element the contains property of the dataValue node is set to data the isNull property of the dataValue node is set to 0
the name property of the dataValue node is set to the local part of the element type (tag name) of the element the value property of the dataValue node is set to the ordered concatenation of all of its child dataValue node's value properties, excluding children that contain metadata (see Attributes on page 129 for more information about the contains property) the isNull property of the dataValue node is set to 0
In addition, each enclosed unit of character data within the element maps to a dataValue node with a name property of an empty string, a value property corresponding to the unit of character data, a contains property of data, and an isNull property of 0. dataValue nodes created according to this rule are the children of the dataValue node mapped from the enclosing element. The child dataValue nodes are ordered in document order. Consider the following example where the element desc has mixed content, repeating Example 4.4.
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[dataGroup (book)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"] [dataValue (desc) = "Basic primer on XML technology."] [dataValue () = "Basic primer on "] [dataValue (keyword) = "XML"] [dataValue () = " technology."]
In the above example the element desc maps to a dataValue node where
"Basic primer on " is an enclosed unit of character data so it maps to a dataValue node named "" "XML" is the content of an enclosed element with the element tag keyword so it maps to a dataValue node named "keyword" " technology." is another enclosed unit of character data so it maps to another dataValue node named ""
each of these three dataValue nodes is a child of the desc dataValue node the children of desc are in the same order that they occur in the XML data document the value of desc is formed by concatenating "Basic primer on ", "XML", and " technology" in that order
the name property of the dataValue node is set to the local part of the element type (tag name) of the element the value property of the dataValue node is set to an empty string the contains property of the dataValue node is set to data the isNull property of the dataValue node is set to 1 the nullType property of the dataValue node is set to empty
This specification provides an extended mapping rule described in section The presence Element on page 453 for overriding this by default behavior by explicitly forcing an empty element to be mapped to a data group. In addition, a data description may be used to specify a different type of null data handling for the element as described in dd:nullType Attribute on page 852. Consider the following example where the element desc is empty.
As defined by the [XML] specification, the empty element can be expressed in a more compact format as follows.
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Whichever way the empty element is expressed, the result of the mapping is as follows:
[dataGroup (book)] [dataValue (ISBN) [dataValue (title) [dataValue (desc) = "15536455"] = "Introduction to XML"] = "" isNull="1" nullType="empty"]
The default treatment of null values can be modified by a data description. A data description is a separate XML document that carries information about the schema of the data, as described in Data Description Specification on page 845. The data description may supply a non-default value for the nullType property of a particular element. The following table shows how loading is affected by nullType for various combinations of nullType value and context. Example 4.14 How loading is affected by nullType
value in the XFA Data DOM isNull
"A Book" 0
Input XML
<title>A Book</title>
nullType
empty exclude xsi empty exclude xsi empty exclude xsi empty exclude xsi
1 0 0
""
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Input XML
<title xsi:nil="true">A Book</title>
nullType
empty exclude xsi empty exclude xsi
""
"" 1 The data description indicates that the element is required empty but the element is not present in the XML data document. a.INote that prior to version 2.5 of this specification this table did not distinguish which value was being shown, the value in the XFA Data DOM or the value in the XML Data DOM. In this case the XFA Data DOM contains a null value, however the original value ("A Book") is preserved in the XML Data DOM. In effect the value is excluded from the document range. As with other excluded material, it is written to the output XML data document when the data is unloaded.
Note that the correct behavior is only defined for xsi:nil attributes with a value of true or false. The data document must not contain xsi:nil attributes with other values. By default the XFA processor loads metadata (attribute values) into the Data DOM. However there is an option to exclude them as described in The attributes Element on page 438. When attributes are loaded they may also be represented by dataValue nodes containing null values. As with elements, the data description may specify nullType for an attribute. However the value of nullType can not be xsi for metadata. It must be one of empty or exclude. The following table shows how loading of metadata is affected by nullType for various values of nullType and contexts.
nullType
empty exclude empty exclude empty
value
"A Book" "" "" ""
isNull
0 1 0 1
The data description indicates that the attribute is required but the attribute is not present in the XML data document.
Although XFA is tolerant of null values, external constraints may bar them in particular contexts. For example, within rich text (which is expressed as a fragment of XHTML) empty elements are legal but not null values. XHTML, as defined in [XHTML], does not comprehend null values. It is important to understand that null values are in almost all ways treated the same as non-null values. For example, suppose that as a result of data binding a field in the Form DOM is bound to a node representing a null value in the Data DOM. This binding has the same effect as a binding to a non-null value. If a value is assigned to the field, that value propagates to the bound node in the Data DOM, and as a result the node in the Data DOM is no longer marked as null. Or if a value is assigned to the node in the Data DOM, that value propagates to the bound field in the Form DOM.
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Example 4.16 Null data in a data value enclosed by another data value
<book xmlns:xsi="http://www.w3.org/2000/10/XMLSchema-instance"> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <desc>Primer on <keyword xsi:nil="true"></keyword>XML technology.</desc> </book>
the name property of the data group is set to the local part of the element type (tag name) of the element the value property of the dataValue node is set to the ordered concatenation of all of its child dataValue node's value properties, excluding children that contain metadata (see Attributes on page 129 for more information about the contains property) the isNull property of the dataValue node is set to 0 (even if all of its children have isNull set to 1)
Example 4.17 A dataValue contains an element that would otherwise map to a dataGroup
<book> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <stamp >Ordered on <date><yr>2000</yr><mo>06</mo><day>23</day></date></stamp> </book>
In the above example the element date encloses purely element content and would be mapped to a data group based upon the rules for data groups (described in the next section); however, the enclosing element stamp maps to a dataValue node and therefore the data loader maps the element date to a dataValue node so that the stamp dataValue node does not become the ancestor to a data group. The result of mapping this XML data document is as follows:
[dataGroup (book)]
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[dataValue (ISBN) [dataValue (title) [dataValue (stamp) [dataValue () [dataValue (date) [dataValue (yr) [dataValue (MO) [dataValue (day)
= "15536455"] = "Introduction to XML"] = "Ordered on 20000623"] = "Ordered on "] = "20000623"] = "2000"] = "06"] = "23"]
the name property of the dataGroup node is set to the local part of the element type (tag name) of the element
As specified above, an element is not a candidate for mapping to a dataGroup node if it is enclosed within an element mapped to a dataValue node; this because dataValue nodes can not be ancestors to dataGroup nodes. An example illustrating this case is presented in Data Values Containing Element Content on page 128.
Attributes
The data loader by default loads attributes into the XFA Data DOM. This applies to attributes of elements associated with both data values and data groups. Each attribute is represented by a dataValue node with a contains property of metadata. The data loader processes attributes of an element prior to processing any content of the element. The effect is that any dataValue nodes resulting from attributes appear as children of the parent node before (left of ) any children resulting from processing content of the element. This is in keeping with the general
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structure of the XFA Data DOM as described in About the XFA Data DOM on page 110, whereby a top-down left-to-right traversal reproduces document order. The set of dataValue nodes resulting from processing attributes are ordered in an implementation-defined order. The XML specification [XML] states that by definition the order of attributes is not meaningful. Hence there is no justification for imposing any attribute ordering restriction upon the data unloader. On the other hand applications using the XFA Data DOM, if they are truly compliant to the XML specification, do not rely on any particular ordering of attributes apart from the previously stated condition that attribute nodes precede content nodes. Consider the following XML data document.
In the above example the XML element book maps to a data group and has a status attribute with a value of stocked. The XML element title maps to a data value and has two attributes, a language attribute with a value of en and an alternate attribute with a value of "XML in Six Lessons". By default the mapping is as follows.
[dataGroup (book)] [dataValue (status) = "stocked" contains="metadata"] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"] [dataValue (language) = "en" contains="metadata"] [dataValue (alternate) = "XML in Six Lessons" contains="metadata"]
Note that in the above mapping the dataValue node called title has two dataValue children, yet its value does not include the values of either of those children. This is because mapped attributes are labelled as metadata, and only dataValue nodes that contain data are included in the value of a parent dataValue node. This is described in Data Values Containing Mixed Content on page 124. When the data is written out to a new XML data document the order of attributes on the title element may change as follows.
The same rules apply to attributes of elements containing mixed content. Consider the following XML data document:
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Attributes of empty data value elements are processed via the same rules as other elements. Consider the following XML data document.
In the above example the empty desc element maps to a dataValue node and has a language attribute. Assume the XFA Configuration DOM has an attribute element containing preserve. Given that empty elements map to dataValue nodes, as described in section Data Values Containing Empty Elements on page 125, the result of the mapping is as follows:
[dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML" [dataValue (unitprice) = "25.00"] [dataValue (currency) = "USD" contains="metadata"] [dataValue (desc) = ""] [dataValue (language) = "en-US" contains="metadata"]
Assume there is a data description which assigns the property dd:nullType="xsi" to the desc field. The xsi:nil markup would normally cause the empty desc element to be loaded as a null value, as
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described in Data Values Representing Null Data on page 126. However the value node possesses a child node (the metadata node) so it cannot be null. The result of the mapping is:
[dataGroup (item)] [dataGroup (book)] [dataValue (desc) = "" isNull="0"] [dataValue (language) = "en-US" contains="metadata"]
space U+0020 tab U+0009 carriage return U+000D line feed U+000A
Note that the [XML] specification allows for white space to be contained within the definition of an element known to enclose only element content, and that such white space is considered insignificant. Distinguishing between significant and insignificant white space within an XML data document depends upon rules described in the following sections, and is dependent upon whether the white space is contained within a data group or a data value.
Example 4.24 White space inside an element that maps to a dataGroup object
<book> <ISBN>15536455</ISBN> <title>Introduction to XML</title> </book>
Note the additional newlines before and after the data values and the spaces inserted to indent the data values from the data group to improve legibility. The additional newlines and other white space within the book data group element are considered insignificant. The data loader produces the same result from the above example as it would from the following.
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Example 4.26 White space inside elements that map to dataValue objects
<book> <ISBN> 15536455 </ISBN> <title> Introduction to XML </title> </book>
Note the additional newlines before and after the data values and the spaces inserted to indent the data values from the data group to improve legibility. As described in White Space in Data Groups on page 132, the additional newlines and other white space within book data group element is considered insignificant. However, the data value element ISBN contains additional leading and trailing space around the text "15536455"; this white space is considered significant. In addition, the data value element title contains leading and trailing newlines and white space; this white space is also considered significant. The data loader produces the same result from the above example as from the following.
Rich Text
Some content may represent rich text, which is text with markup representing formatting information such as underlining. A subset of HTML and CSS markup is supported in XFA, as described in Rich Text Reference on page 1039. The markup within rich text data is not represented by nodes in the XFA Data DOM. Rather, it is stripped of markup and represented in the XFA Data DOM as plain text, as described in the chapter Representing and Processing Rich Text on page 192.
Image Data
XML data documents may include image data, either in-line or by reference. To be recognized as enclosing image data an element must have a contentType attribute in the XFA data namespace (http://www.xfa.org/schema/xfa-data/1.0/). The value of this attribute must be a MIME-type
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identifying an image type. During loading the XFA processor copies this value into the contentType property of the corresponding dataValue node in the XFA Data DOM. However, after inspecting the image data, the XFA processor may decide that the image is in a different format and update the value of the property in the XFA Data DOM. Any such inspection, if and when it is done, is done on a best-effort basis. In addition, if the image is included in-line, there may be a transferEncoding attribute, also in the XFA data namespace. The value of this attribute indicates the manner in which the image data is encoded. There are two supported values for xfa:transferEncoding. An xfa:transferEncoding value of base64 means the data is encoded using the base 64 method described in [RFC2045]. This encoding method packs only six data bits into each character, but the resulting character are all legal element content. This is the default encoding method assumed when there is no xfa:transferEncoding attribute. For example, the following fragment of a data file contains image data.
In the above example the image is a raster scan of a black circle within a square black frame, encoded as a BMP. The content of the BMP file was then coded as base 64. Finally the base 64 encoded data was formatted by inserting line breaks and white space. This is acceptable because base 64 decoders are required to ignore line breaks and white space. An xfa:transferEncoding value of cdata means the image data encoded according to the rules for XML, with each byte of data represented by a character or a single-character XML entity. For example, an image might be encoded as follows (only part of the data is shown).
In this case, the image data can not include line break or white space characters except as a literal part of the image data. The data shown does not correspond to any particular image. The ellipsis (...) represents additional data which, for even a very small image, would not fit on the page. Caution: XML 1.0 restricts characters to the following production:
Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]
This restriction applies even to characters expressed as numeric entities, according to "Well-formedness constraint: Legal Character" in [XML1.0]. Hence an image encoded this way must not include bytes with the values #x0 through #x8, #xB, #xC, #xE, or #xF.
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XML 1.1 [XML1.1] removes this restriction, but XML 1.1 is not widely used and XFA processors are not required to support it. (Acrobat does not.) In addition, XFA expressly forbids the use of character code zero (#x0), as described on page 113. If the image is included by reference, there must be an href attribute. Note that the href attribute, unlike the transferEncoding attribute, must be in the default namespace. It must not have a namespace prefix. The assumption is that the external reference is already there in the data for some other purpose. The value of the href must be a URI.
In the above example the XML data document happens to be an HTML page. The href attribute is intended for use by a browser, which understands the img tag. However, XFA does not understand this tag. Adding the xfa:contentType attribute informs the XFA processor that the reference is to an image. The form of the URI #Logo.bmp indicates it is a relative URI, that is, it points to another element in the same XML data document. Within the XFA Data DOM the element representing the image is represented by a dataValue node. The dataValue node is normal except that its contentType property is set to an image MIME type. The value property of the dataValue node is the text, if any, that appears inside the element in the XML data document. For example, for an image included by value and encoded in base 64, as in the first example above, the value is the base 64 encoded string. For an image included by reference the element must be empty and is treated according to the rules for empty-element processing as described in Data Values Containing Empty Elements on page 125. The contentType property is initially set to the MIME type supplied by the contentType attribute. However the XFA application may at any time update the contentType property to some other image type. This could happen, for example, if it examines the image data and discovers that it corresponds to some other image type. The XFA application is not required to perform this analysis. For an image included by reference the href attribute is treated as a normal attribute. That is, it is loaded by default but may be excluded along with other attributes. If loading of attributes is enabled, it is represented in the XFA Data DOM in the same way as any other attribute, by a dataValue node with its contains property set to metadata. To preserve security of local data, when an XFA processor encounters an image referenced by URI, the XFA processor verifies that the referenced location is inside the current package, i.e. inside the XDP or PDF that supplied the template. If it is not inside the current package, the reference is blocked.
Updating the XML Data DOM for Changes Made to the XFA Data DOM
The XFA application may make edits to the XFA Data DOM during processing. These edits may include insertions and deletions of nodes, moving nodes, and updating the content of nodes. The XFA Data DOM is responsible for ensuring that all such edits are propagated to the XML Data DOM to ensure the XFA Data DOM and the XML Data DOM stay synchronized. The XFA Data DOM detects and refuse to carry out edits that would lead to the production of invalid XML during data unloading. For example, if the XFA application attempts to create a data value with the same name as a sibling and both siblings have their
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contains properties set to metadata, the XFA Data DOM refuses to create the new data value on the grounds that attributes of the same element must have unique names.
Updating the XFA Data DOM for Changes Made to the XML Data DOM (Append Loading)
The XFA Data DOM provides a facility for loading data from an XML data document into an XFA Data DOM that already contains nodes. This specification refers to such a load as an append-load. Append-loads are not used in normal processing but may be employed by scripts. When carrying out an append-load the data loader follows the same rules described elsewhere in this specification, except that:
The start element for the load is determined at invocation time, without regard to startNode option of the XFA Configuration DOM. The new data is appended as a subtree, the root of which is the child of an existing node. The node to which the new subtree is appended must be determined at invocation time.
The XFA Data DOM is responsible for propagating nullType properties into the XFA Form DOM. When the the XFA Data DOM is asked to provide node information, it consults the nodes data description to determine whether it provides null type information. If the node provides such information, the XFA Data DOM provides it as the new data value nodes nullType property. Otherwise the nullType property is inherited from the nodes parent. The highest-level data group cannot inherit, so if its nullType is not specified, it defaults to the value empty.
Unload Processing
The data unloader provides a facility for creating or updating an XML data document that represents the XML Data DOM. When invoked, the data unloader produces an XML data document which reflects the contents of the XML Data DOM, as of the moment at which the data unloader was invoked. When unloading the XML Data DOM, the XML data document produced by the data unloader is such that insofar as possible the data can make a round-trip back to the XFA Data DOM. Round-tripping means that when the new document is subsequently loaded into an empty XFA Data DOM using all the same data loader configuration options, the resulting XFA Data DOM is indistinguishable from the original XFA Data DOM at the moment the data unloader was invoked. When the default data mapping rules described in this chapter are used round-tripping is always supported. Round-tripping is also supported for most, but not all, extended data mapping rules. The data unloader encodes characters using XML character references when necessary to conform to XML. In lieu of character references it may use the special strings defined by the XML Specification [XML] which includes "<" for "<" (less-than sign), ">" for ">" (greater-than sign), and "&" for "&" (ampersand). Inside attribute values it may also use """ for """ (quotation mark) and "'" for "'" (apostrophe) as defined by the XML specification [XML]. The data unloader may insert XML-style comment(s) into the output document. It should insert a comment near the beginning identifying itself and its version number.
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When loaded into the XFA Data DOM using default mapping rules the result is:
[dataGroup (author)] [dataValue (firstname) = "Charles"] [dataValue (lastname) = "Porter"]
Suppose that during processing the firstname and lastname dataValue nodes are deleted. The result is that the XFA Data DOM contains:
[dataGroup (author)]
By default empty elements are loaded as data values. To prevent this, the data unloader writes out the author element with an attribute that marks it as a dataGroup.
Similarly if the configuration options are such that an empty element would be loaded as a dataGroup, but the element is being written to represent the content of a dataValue, the data unloader writes out the element with an xfa:dataNode attribute having a value of dataValue. For example, suppose default mapping rules are in force and the XML Data DOM (after some processing) contains:
[dataValue (foo) = "xyz"] [dataValue (bar) = "xyz"]
The node foo corresponds to an element containing nothing but another element, but such elements are normally loaded as data groups. Yet foo is a data value. When the new XML data document is created the data unloader adds an attribute to mark foo as a data value.
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the XFA processor with respect to null data while unloading is summarized by the following tables. Each of the tables assumes that the name property of the data value node is set to title. When nullType is empty the following table applies: nullType
empty empty empty
isNull
0 0 1
value
"A Book" "" "A Book"
contains
data data data
Output XML
<title>A Book</title> <title xsi:nil="false" />
Cannot occur. If a script sets isNull to 1, the value property is automatically set to the null string, and if a script sets value to something other than the null string, isNull is automatically set to 0.
<title /> title="A Book" title=""
1 0 0 1
Cannot occur. If a script sets isNull to 1, the value property is automatically set to the null string, and if a script sets value to something other than the null string, isNull is automatically set to 0.
title=""
empty
""
metadata
isNull
0 0 1 1 0 0 1 1
value
"A Book" "" "A Book" "" "A Book" "" "A Book" ""
contains
data data data data metadata metadata metadata metadata
Output XML
<title>A Book</title> <title />
No output for this data node or its children. The node is marked transient and is excluded from the output document.
title="A Book" title=""
No output for this data node. The node is marked transient and is excluded from the output document.
isNull
0 0
value
"A Book" ""
contains
data data
Output XML
<title>A Book</title> <title />
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nullType
xsi xsi
isNull
1 1
value
"A Book" ""
contains
data data
Output XML
<title xsi:nil="true">A Book</title> <title xsi:nil="true" />
Note that nullType cannot have the value xsi when contains is set to metadata.
Logical Equivalence
The rules stated above ensure that every implementation produces logically equivalent output given the same inputs. Logical equivalence includes exact character-for-character reproduction of the content of elements that map (or would map, if they were within the document range) to data values, including attribute values. However it does not include white space within the character data of elements that map (or would map) to data groups. Hence, the data unloader may insert white space characters and newlines within elements representing data groups. This is useful for improving readability. When the output XML data document is loaded into a new XML Data DOM the new XML Data DOM does not necessarily have the same content as the original XML Data DOM, however the XFA Data DOM that derives from it has the same content as the original XFA Data DOM.
Input parsing. Data to be loaded into the XFA Data DOM or provided by a user may be formatted in a style unique to the locale (a locale-dependent format) or in canonical format. Before data is loaded into the XFA Data DOM, the XFA processing application converts the data into canonical format, a process called canonicalization. Output formatting. After data is in the XFA Data DOM, there is eventually a need to display, save or print the canonical data in a locale-specific format. The process of converting the canonical data into a locale-specific form is called localization.
Chapter 4, Exchanging Data Between an External Application and a Basic XFA Form
Internationalized applications take into consideration varying user expectations regarding dates, times, numbers, and currencies. Such applications present and accept information in a locale-specific format that uses familiar characters or ideographs.
An XFA processing application determines the locale to localize/canonicalize a specific field (called the prevailing locale) by examining the following sources, in order: 1. Explicit declaration in the picture clause, for example date(fr){DD MMMM, YYYY}.
Chapter 4, Exchanging Data Between an External Application and a Basic XFA Form
2. Template field or subform declarations, using the locale property. 3. Default locale specified in the Configuration DOM. 4. Ambient locale. Ambient locale is the system locale declared by the application or in effect at the time the XFA processing application is started. In the event the application is operating on a system or within an environment where a locale is not present, the ambient locale defaults to English United States (en_US).
Picture Clause
D. MMMM YYYY D MMMM YYYY MMMM D, YYYY
The Configuration DOM can also declare a URI pointing to an external document containing a locale set. Some XFA processors ignore this setting for security reasons. When it is honoured (for example by LiveCycle), the order of precedence is: 1. the forms localeSet packet, 2. the locale set pointed to by xfa.config.agent.common.localeSet, 3. the XFA processors default locale set. XFA processors that ignore the external locale set, such as Acrobat, exhibit the following order of precedence: 1. the forms localeSet packet, 2. the XFA processors default locale set.
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XFA processors also implement an inheritance mechanism for locale properties. When a property is not supplied for a particular locale the processor adopts the property specified by its parent locale. For example if the locale fr_BE (French Belgium) has some properties unspecified the processor copies those properties from the locale fr (French). If a property is also unspecified in fr then the processor copies it from the root locale, which is always fully specified and is equivalent to en_US.
where
LL signifies a two-letter language code, SSSS signifies a four-letter script code, TT signifies a two-letter territory code, and V signifies a variant code which may be one or more characters.
All characters in a locale name must be printable ASCII. It is recommended that the language, script, territory, and variant codes be alphanumeric. Locale names are case-insensitive but it is recommended to follow the case conventions described in [UTS35]. The following table presents examples of locale identifier strings. Such designators can change, reflecting the dynamic geopolitical world.
Description Arabic specific for Saudi Arabia. Azerbaijani for Azerbaijan using the Cyrillic script. English. English specific for Canada. English specific for the United Kingdom. English specific for the United Kingdom, using the Euro as the default currency.
Chapter 4, Exchanging Data Between an External Application and a Basic XFA Form
Description English using the Latin alphabet for the United States of America and employing ASCII characters with no thousands separator. French. French specific for Canada. Korean specific for the Republic of Korea. The default ideograph script for this designator is Hangul. Korean specific for the Republic of Korea. The ideograph script for this designator is Hanja. Traditional Thai with Thai digits. Chinese specific for China. Chinese specific for Hong Kong.
Note: The full locale identifier strings (language_country) should be used for currency numeric values because currencies differ from country-to-country. For example, the currency representations for the en_GB (English for the United Kingdom) and en_CA (English for Canada) locales are quite different, even though some of their date representations are identical. It is also permitted (and very common) to supply a Unix-style locale name to an XFA processor by omitting the script as follows:
LL_TT[_V]
When the script is omitted the XFA processor infers the fully-specified name using its knowledge of the language and/or territory.
Fully-Specified Locale
en_Latn_GB en_Latn_US ru_Cyri_RU
About the Canonical Format Used in the Data and Form DOMs
Inside the Data and Form DOMs, data is always stored in a canonical format, in which date, time, date-time, and numbers are represented in a standard (canonical) format (Canonical Format Reference on page 898). For example, the canonical format for dates are as follows:
YYYY[MM[DD]] YYYY[-MM[-DD]]
In the above examples, letters represent the numeric values described below, square brackets delineate optional parts, and dashes (-) represent literals.
Chapter 4, Exchanging Data Between an External Application and a Basic XFA Form
Symbol YYYY MM DD
Meaning Zero-padded 4-digit year. Zero-padded 2 digit (01-12) month of the year. Zero-padded 2 digit (01-31) day of the month.
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A more fundamental limitation applies to currencies, namely that there is no way to automate conversions between currencies. Currency exchange rates are constantly fluctuating and in any case the appropriate rate varies depending on circumstances (a retail banking customer can't get the same conversion rate as a financial institution can). Hence currency conversions should not and can not be done automatically. Therefore locale can be used for simple currency formatting and parsing but it entirely is up to the creator of the form and designer of the web service or data file to arrange for monetary amounts to be computed in the appropriate currency.
Defining Locales
An XFA form may carry with it a set of locale definitions. These are carried in the localeSet packet. See The localeSet Element on page 154 for more information about the localeSet packet. It is not necessary to include a definition for en_US (United States of America English) because it is the default for XML and consequently is available and thoroughly tested on all platforms. On the other hand including a locale definition this way makes the definition accessible to scripts for reading via SOM expressions. Built-in locale definitions are not accessible this way, although of course the locales they define can still be used. Caution: Scripts within the form must not alter locale definitions. The result of any such attempt by a script is undefined.
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This facility is intended for use on servers in automatic workflows, not in forms distributed widely for interactive use, and is restricted accordingly. XFA forms may be packaged inside XDP or PDF files. However when an XFA form is packaged inside a PDF file the form must not refer to an external locale database. Instead locale definitions that are used by the form must be fully resolved and the resolved locale database must be included in the PDF file. This preserves the portability and permanence of the PDF file and closes a security hole. Without this an attacker could use a network redirection attack (such as DNS spoofing) to substitute a modified locale dictionary, changing the currency symbol so that the amount indicated would be different from the amount approved. For additional information see Structuring Forms for Portability and Archivability on page 491. Note: Acrobat by design ignores the locale property in the common portion of the Acrobat section of the Config DOM. It makes no sense for the server to override the clients locale. It is not practical to include all locales ever defined because the definitions take about 3 kilobytes apiece and there are a great many of them. It is more efficient to include only those that might be used. The following example shows an external locale database that defines only those properties which it needs to override. For German-language locales it replaces month and day names with uppercase and lowercase Roman numerals. For English-US locales it changes the default format for dates.
Assume that the above document is available at the URI http://example.com/myproject/locale.xdp. The configuration document enables the use of this locale database for an agent named payroll as follows.
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Chapter 4, Exchanging Data Between an External Application and a Basic XFA Form
XML DOM
XFA app writes out data, possibly in response to the user directing the app to save the data bind/picture XFA app reads in data
Data DOM
(all data in canonical form)
format/picture User activates an event that has a print action
Display
bind/picture connect/picture Web service interactions Web service interactions User activates an event that has a submit action
Printer
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Picture clauses and their role in output formatting (localization) and input parsing (canonicalization)
Picture clause parent element
Role of picture clause User modification of a data value. For output formatting (localization), the picture clause specifies the format used when the container comes into focus (is selected). For input parsing (canonicalization), the picture clause specifies the format expected from the user.
<field name="field1" > <ui> <picture> </picture> </ui> </field>
(edit pattern)
format
(output pattern)
Display or print of data. In the case of display, this form prevails only if the field is not currently in focus (selected).
<field name="field1" > <format> <picture> </picture> </format> </field>
connect
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Picture clauses and their role in output formatting (localization) and input parsing (canonicalization)
Picture clause parent element
Role of picture clause Specifies a test applied to data in the Form DOM, where the test verifies the data complies with the given picture clause. Generally, the validation picture clause reflects canonical format and is locale-agnostic because all data in the Form DOM is represented in canonical format. The validation test must succeed before the XFA processing application updates the Data DOM with the value from the Form DOM.
<field name="field1" > <validate> <picture> </picture> </validate> </field>
The validate picture clause is used for testing, not for conversion.
bind
Rule 1, Non-Localizable Data Rule 2, Input Parsing a Data Value Using a Picture Clause Rule 2A, Input Parsing a Without a Picture Clause May Use Default Picture Clauses for Current Locale Rule 3, Output Formatting Rule 4, Output Formatting When Output Picture Clause Omitted Rule 4A, Output Formatting a Null Value Rule 5, FormCalc Scripts May Localize/Canonicalize Data in the XFA Data DOM
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Non-textual data (such as values defined with the arc, image, or rectangle elements) is not localizable. For example, the image defined in the following fragment cannot be localized.
Text entered into a field with an bind, ui, or connect picture clause is canonicalized per the picture clause, provided it matches the picture clause. If any of the following conditions are true, the text is assumed to have been entered in canonical format:
Supplied data does not match the picture clause Picture clause omitted Picture clause is defective
For example, assume a field has an input picture clause and a textEdit widget, as follows.
Regardless of the widget type, canonicalization on input is controlled solely by the picture clause. Assume that the locale is fr_FR and the input text is "1.234,56". This matches the picture clause, so the data is canonicalized into "1234.56" and goes into the XFA Data DOM this way. On the other hand, had the input text been "nicht", it would not have matched the picture clause, so it would have been copied literally into the DOM as "nicht". A special case of this occurs if the input text is "1234.56", that is, if it is already canonical. Because this does not match the picture clause (which expects the text to be localized), the already-canonical data is copied directly into the DOM. The following field accepts a date.
If our French user enters, for example, "12-janvier-2004", the data is canonicalized to "20040112".
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A picture clause may contain multiple pictures. In the following example two different date formats are recognized and canonicalized automatically.
If the user enters either "12-janvier-2004" or "12-01-2004" the result is the same. The input text matches the first or second picture, respectively, and either way is canonicalized to "20040112".
Rule 2A, Input Parsing a Without a Picture Clause May Use Default Picture Clauses for Current
Locale
If the field omits a picture clause but describes data that is traditionally localized, the data is input parsed using default picture clauses for the locale. For example, if the user provides a date value for the field in the following example and the current locale is fr_FR, the data is input parsed against the default date picture clause for French speakers in France. The locale-dependent picture clauses are specified in the locale set grammar, Locale Set Specification on page 806. For example, if the default date picture clause for France is D-MMMM-YYYY and the user enters either "12-janvier-2004", the data is canonicalized to "20040112".
Text in a field with an output picture clause is formatted for display per the picture clause when the field is redrawn (including when the user tabs out of the field). This does not affect the content in the DOM. For example, assume a field has a format picture clause as follows.
Assume further that the locale is fr_FR and the content of the field in the DOM is "1234.56". When the user tabs out of the field, the field is re-displayed as "1.234,56". The following field contains a date.
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If the content of the field "20040112", the data is displayed or printed as "12-janvier-2004". If the picture clause contains more than one picture, the first picture is used and the others ignored.
Rule 4, Output Formatting When Output Picture Clause Omitted
The following table describes how an XFA processing application localizes data whose container omits the picture clause for a particular type of output. Type of picture clause
connect bind ui and format
How unpictured data is formatted Canonical format. Canonical format. Formatted as follows: Content element name
date
Formatted with Default date picture clause for the locale (usually the medium date), as described in The localeSet Element on page 154 Default time picture clause for the locale (usually the medium time), as described in The localeSet Element on page 154 Default date picture clause and default time picture, separated with a T. Default decimal radix (decimal point) for the locale, as described in The localeSet Element on page 154. Separators are not inserted.
time
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If the float element had contained a value, it would have been the default value for the field. When empty as in this case, there is no default value; however, the type declaration still applies. Thus, the field qualifies for automatic localization.
Rule 5, FormCalc Scripts May Localize/Canonicalize Data in the XFA Data DOM
Scripts written in FormCalc can call functions to localize or canonicalize specific data in the XFA Data DOM, as discussed in FormCalc Specification on page 902. JavaScript does not have corresponding methods.
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<day>dimanche</day> <day>lundi</day> <day>mardi</day> <day>mercredi</day> <day>jeudi</day> <day>vendredi</day> <day>samedi</day> </dayNames> <dayNames abbr="1"> <day>dim.</day> <day>lun.</day> <day>mar.</day> <day>mer.</day> <day>jeu.</day> <day>ven.</day> <day>sam.</day> </dayNames> <meridiemNames> <meridiem>AM</meridiem> <meridiem>PM</meridiem> </meridiemNames> <eraNames> <era>av. J.-C.</era> <era>ap. J.-C.</era> </eraNames> </calendarSymbols> <datePatterns> <datePattern name="full">EEEE D MMMM YYYY</datePattern> <datePattern name="long">D MMMM YYYY</datePattern> <datePattern name="med">D MMM YYYY</datePattern> <datePattern name="short">DD/MM/YY</datePattern> </datePatterns> <timePatterns> <timePattern name="full">HH' h 'MM Z</timePattern> <timePattern name="long">HH:MM:SS Z</timePattern> <timePattern name="med">HH:MM:SS</timePattern> <timePattern name="short">HH:MM</timePattern> </timePatterns> <dateTimeSymbols>GaMjkHmsSEDFwWxhKzZ</dateTimeSymbols> <numberPatterns> <numberPattern name="numeric">z,zz9.zzz</numberPattern> <numberPattern name="currency">z,zz9.99 $</numberPattern> <numberPattern name="percent">z,zz9%</numberPattern> </numberPatterns> <numberSymbols> <numberSymbol name="decimal">,</numberSymbol> <numberSymbol name="grouping"></numberSymbol> <numberSymbol name="percent">%</numberSymbol> <numberSymbol name="minus">-</numberSymbol> <numberSymbol name="zero">0</numberSymbol> </numberSymbols> <currencySymbols> <currencySymbol name="symbol"></currencySymbol> <currencySymbol name="isoname">EUR</currencySymbol> <currencySymbol name="decimal">,</currencySymbol>
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</currencySymbols> </locale> <!-- Start of a locale definition. --> <locale name="en_GB" desc="English (United Kingdom)"> </locale> </localeSet> </xdp>
The numeric grouping character for fr_FR is a non-breaking space, depicted here as "". In the actual XML file all characters are encoded using Unicode code points and UTF-8 encoding as specified by [XML 1.0]. Note: The localeSet element and all of its contents reside in the namespace http://www.xfa.org/schema/xfa-locale-set/2.6/. The order in which the locales appear is not significant. The information for each locale consists of several sections, which may be present in any order. If any of the sections is omitted, or an element or attribute omitted from within a section, the effect is to select the corresponding default value.
Calendar symbols
This section supplies the names for months of the year and days of the week (both the full names and the abbreviated names). It also supplies the names for modifiers equivalent to A.D. and B.C., A.M. and P.M. The placement of these names and modifiers is determined by the date, time, or date-time picture clause in use.
Date patterns
This section supplies picture clauses for four standard date formats. The formats are distinguished by verbosity ranging from full to short.
Time patterns
This section supplies picture clauses for four standard time formats. The formats are distinguished by verbosity ranging from full to short.
Currency symbols
This section supplies the characters to be used for the currency symbol and the currency radix. It also supplies the string to be used for the ISO currency name. The placement of these symbols within currency amounts is determined by the numeric picture clause in use.
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Number patterns
This section supplies picture clauses for four standard number formats. There are only three picture clauses because two number formats (decimal and integer) use the same numeric picture clause; the integer format uses only the integer part of the numeric clause whereas decimal uses the whole thing.
Number symbols
This section supplies the characters to be used for the non-currency decimal radix, grouping separator, percentage sign, and minus sign. The placement of these characters within numbers is determined by the numeric picture clause in use.
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XFA Specification Loading a Template to Produce the XFA Template DOM 158
XML DOM
Data DOM
elements and attributes which are not in the XFA template namespace; elements and attributes which are not recognized by the XFA processor as part of the template schema; elements which do not belong in the current view, for example an element that is marked as relevant only to printing but the current application is interactive.
It is an error for the XML Template DOM to contain elements or attributes in the XFA template namespace that are not part of the template schema, but it is not a fatal error. A warning message may be generated but processing continues. It is not an error for the other types of excluded content to be present. The nodes of the XFA Template DOM are peered to the nodes of the XML Template DOM to allow the XFA processor to make changes to the XFA Template DOM and then save the modifed template as a new XML Form Template. After this the XFA processor resolves prototypes. For each prototype reference it copies content from the referenced prototype into the XFA Template DOM. Some prototypes may be in external XML Form Templates, so resolving prototypes may involve creating and loading additional transient XML Template DOMs and corresponding transient XFA Template DOMs. The transient DOMs are retained during subsequent prototype processing so that subsequent references to the same document can be processed without reloading. (This is not only for performance reasons. It also protects against loss of internal consistency should the external document be modified during processing.) Once all prototypes have been resolved, including nested prototype references, the transient DOMs are deleted.
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XFA Specification Basic Data Binding to Produce the XFA Form DOM 159
Overall principles of XFA processing of user data, as described in Creating, Updating, and Unloading a Basic XFA Data DOM on page 109 Structure of an XFA form template, as described in Template Features for Designing Static Forms on page 30 SOM expressions (including scope matching), as described in Scripting Object Model on page 74
XML DOM
Form DOM
Data DOM
Binding the Data DOM to the Template to produce the Form DOM
However under some circumstances a node is created in the Form DOM which does not match any existing note in the Data DOM. When this happens, if there is a data description, the data description is consulted to determine what structure the data would have had if it had been there. Then processing proceeds as though all that structure was present in the Data DOM, except of course that the node(s)
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XFA Specification Basic Data Binding to Produce the XFA Form DOM 160
being added to the Form DOM are not associated with any nodes in the Data DOM. By contrast if there is no data description then the new structure in the Form DOM is based purely on the Template DOM. Note: The presence of a data description does not by itself guarantee that the Data DOM will conform to the data description at the end of the data binding process. To ensure conformance after binding, the data must start off conforming to, or being a subset of, the data description. In addition the structure of merge-able nodes in the template must correspond to the data description or to a super set of it. However these restrictions are not imposed or enforced by the data binding process. It does not check for conformance and has no problem dealing with non-conforming data or indeed with the absence of a data description. Optionally, after all other processing on a record is complete, the data binding process may adjust the Data DOM to make it exactly parallel the structure of the Form DOM. This forces the data into a shape imposed by the template and the data description. Use of this option precludes round-tripping. Data binding is also known as merging because it can be thought of as merging the data (and possibly data description) with the template. A variant known as an empty merge does not use data from the Data DOM. In this case, the Form DOM is created based on the template and the data description. Optionally, default data matching the Form DOM may be inserted into the Data DOM.
Conventions
Many drawings in this section depict relationships between nodes in tree graphs. Nodes are depicted using different shapes and shadings, as shown in the following figure.
nam e
non-transparent subform
transparent subform
nam e
subform set
nam e
instance manager
Data DOM
nam e
data group
nam e va lu e
data value
nam e va lu e nam e va lu e
exclusion group
field
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XFA Specification Basic Data Binding to Produce the XFA Form DOM 161
The relationships between nodes can be of several types. The following diagram shows the depiction of different types of relationships. A node can have multiple children. The ordering of the children is significant. The children are in order of decreasing age (that is, from the first child added to the last child added) from left-to-right and top-to-bottom. As with English text, top-to-bottom has a higher priority than left-to-right. In the same way, the words on a line of text precede the words on the next line of text, even if the words on the next line are to the left of the words on the first line.
Template DOM
A
Form DOM
A
Data DOM
A Binding resulting from a simple match Parent node
Parent-child link C xyz C xyz Child node Binding resulting from a scope match
Data binding fills the Form DOM by copying individual nodes from the corresponding prototype nodes in the Template DOM. In diagrams this relationship is shown by the dashed lines between the prototype nodes in the Template DOM and the corresponding nodes in the Form DOM. Often nodes in the Form DOM are bound to nodes in the Data DOM. When this happens diagrams show the value in the data node duplicated in the form node. In addition the binding is shown with either a dashed line or a dot-dashed line. The two types of line represent bindings that occur for different reasons. The different types of binding correspond to the different types of matches to SOM expressions, dashed lines to direct matches
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XFA Specification Basic Data Binding to Produce the XFA Form DOM 162
and dot-dashed lines to either indirect or scope matches. The types of matches are explained in Scripting Object Model on page 74.
Explicit bind targets defined in the template take precedence over automatic bindings. For automatic bindings the relative order of same-named data values or groups is significant. For automatic bindings the relative order of uniquely-named data values or groups is not significant. For automatic bindings the hierarchy of structure described by data values or groups is significant.
The rules for automatic bindings are equivalent to the ones used for resolving SOM expressions. Indeed one way of describing the matching process is that the data binding process attempts to find a data node such that, when the path from the root of the Data DOM to the data node is written as an unqualified SOM expression, the resulting SOM expression matches the form node as seen from the root of the Form DOM. This is explained in more detail later. The data binding process sometimes adds data nodes but it never deletes any data nodes. In addition it reads but does not modify the Template DOM. On the other hand it populates the Form DOM.
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XFA Specification Basic Data Binding to Produce the XFA Form DOM 163
sub-properties controlling the object's behavior during data binding and afterward. The sub-properties are match, picture, and ref.
The node representing the parent object will bind to a node in the XFA Data DOM in accordance with the standard matching rules. This is the default value.
none
The node representing the parent object will not bind to any node in the XFA Data DOM. This is normally used for nodes that are transient, that is, that will not be written out if the DOM is saved to a file.
global
This is only allowed if the parent object is a field. It signifies that field is capable of binding to global data. If the normal matching rules fail to provide a match for it, the data-binding process will look outside the current record for global data to bind to the field. Note that, whereas a regular data value node can only bind to one field, a single global data value node can bind to many fields. The current record is always a subtree within the Data DOM. Global data is any data value that is not inside any record but that is at least as high in the hierarchy as a record. See Creating, Updating, and Unloading a Basic XFA Data DOM on page 109 for more information.
dataRef
The parent object will bind to the node in the XFA Data DOM specified by the accompanying ref property.
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XFA Specification Basic Data Binding to Produce the XFA Form DOM 164
Data DOM
registration
first Jack last Spratt apt street 99 Candlestick Lane city London country UK postalcode SW1
When the registration data is loaded into the Data DOM the result is as shown (right).
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XFA Specification Basic Data Binding to Produce the XFA Form DOM 165
The template was created with field names that match the data elements one-for-one. A highly simplified skeleton of the template follows.
Template DOM
registration
first
Note that the field names match the data element names in letter-case. This is required because when the data-binding process matches data values with fields it uses a case-sensitive name comparison. When the template is loaded into the Template DOM the result is as shown (right).
last
apt
street
city
country
postalcode
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XFA Specification Basic Data Binding to Produce the XFA Form DOM 166
The Form DOM resulting from this operation represents the binding between data and template. The relationship between the three DOMs is shown below.
Template DOM
registration
Form DOM
registration
Data DOM
registration
first
first Jack last Spratt apt street 99 Candlestick Lane city London country UK postalcode SW1
first Jack last Spratt apt street 99 Candlestick Lane city London country UK postalcode SW1
last
apt
street
city
country
postalcode
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XFA Specification Basic Data Binding to Produce the XFA Form DOM 167
4. Re-normalize (adjust the Data DOM to mirror the Form DOM) (Re-Normalization (Step 4) on page 182). 5. Perform calculations and validations (Calculations and Validations (Step 6) on page 190). 6. Issue the form ready event (Form Ready Event (Step 7) on page 190). 7. If scripts modify the Data DOM after the Form DOM has been created, it may be necessary to wholly or partially repeat the data binding process (Remerge and Incremental Merge (Step 8) on page 191). The following subsections expand on some of the steps above.
Create Form Nodes and Match with Data Nodes (Steps 1 and 2)
Continuing the example from the previous section, Step 1in the data-binding process is simple. Each node in the Template DOM is copied into the Form DOM. Some nodes are not merge-able; for example, draws can not match up with user data, nor do they contain other elements that can, so they are not merge-able. As each node is copied into the Form DOM, if it is merge-able, it is matched with the same-named data element. (Only merge-able nodes have been shown in the accompanying illustrations.) These are so-called direct matches in which, not only do the node names match, but the names of all their merge-able ancestors match in sequence. This corresponds to the logic of SOM expressions; if a data node and a form node directly match, they are both named by the same SOM expression relative to the current record and the top-level subform, respectively. For example, the city field in the Template DOM could be expressed by the SOM expression registration.city relative to the root of the Template DOM. At the same time the city node in the Data DOM could be expressed by the SOM expression registration.city relative to the root of the Data DOM. Hence the two nodes match and the data binding process binds them together. It is important to note that for a data node and a form node to bind together they must be compatible types. A subform can bind to a data group but not a data value. A field can bind to a data value but not a data group. The highest-level subform and the data node representing the current record are special; they are always bound even if their names don't match. In fact it is common for the highest-level subform in a template to be unnamed, that is to not have a name attribute. In the example assume that the data holds just one record (the registration data group and its content). This is a common arrangement. In this case, the registration data node is the one representing the current record. If the data was missing some elements, all fields would still be placed into the Form DOM but some field nodes would remain unbound. This corresponds to a paper form that has not been completely filled in. However the template may specify a default values for any field, thereby forcing the field to be initialized with the default value whenever the data does not fill it. Furthermore if a data description is present it may force additional structure to be included. However for this example assume that the data description is not supplied or simply mirrors the structure of the example data. If the data had extra elements whose names differed from anything in the template, those extra data nodes would simply be left unbound. This is true regardless of the contents of the data description. The resulting Form DOM would in effect represent a subset of the data. Applications can therefore use multiple templates with different template objects to present different views of the same data. In addition many types of template nodes have a relevant property which gives a different kind of control. The relevant property affects what portions of the template are loaded into the Template DOM by particular applications. For example, a particular element might be marked relevant only to printing. An interactive
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client would ignore that element when loading the Template DOM. In this way the same template can present different views in different contexts. Now suppose that the form designer decides to separate part of the registration subform into a separate address subform. This might be done in order to make it easier to reuse the address subform in other templates. The resulting template has the following skeletal structure.
Despite this change to the template, the same data will still bind correctly to the template. Consider the same example data as in Example 4.50, repeated here for convenience.
Example 4.53 The same data works with the modified template
<?xml version="1.0"?> <registration> <first>Jack</first> <last>Spratt</last> <apt></apt> <street>99 Candlestick Lane</street> <city>London</city> <country>UK</country> <postalcode>SW1</postalcode> </registration>
The registration subform still matches the registration data group so they are bound as before. Similarly the data values first and last still match their respective fields within the registration subform. However when the data-binding process reaches the apt data value, it finds that there is no direct match. In the absence of a direct match, the data binding process looks for a scope match. A scope match occurs when the data node in question is the sibling of a node which has an ancestor bound to an ancestor of a node with the same name as the data node. In this case, it finds that the apt data value is a sibling of the first data value, which has an ancestor (the registration data group) bound to the registration subform, which in turn contains a field named apt. Hence the apt data value scope matches the apt field. (The same thing can be expressed in terms of parallel SOM expressions thus: The SOM expression for the apt field is $form.registration.address.apt. When applied to the root of the data record this would directly match $record.registration.address.apt, but there is no such node. Instead, there is a $data.registration.apt which when mapped to $form.registration.apt scope-matches $form.registration.address.apt.) Therefore the data-binding process copies the address subform into the Form DOM, followed by the apt field, and binds the field and data value nodes together. By the same logic the street, city, country and
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postalcode data values are bound to the fields which they scope match in the address subform. The result is shown in the following diagram.
Template DOM
registration
Form DOM
registration
Data DOM
registration
first
last
address
address
apt
street
city
country
postalcode
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Template DOM
registration
Form DOM
registration
Data DOM
registration
address
address
street
Ancestor match
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The following figure shows a sibling match. In this case, the data has the address information contained within an address data group, but in the template the country field is still at a higher level. (Perhaps because the country information is often used as a sort key separately from the rest of the address information.) The country field is the sibling of the address subform, and the address subform is bound to the address data group. Therefore the country data value scope-matches to the country field.
Template DOM
registration
Form DOM
registration
Data DOM
registration
address
address
address
country
country
country UK
Sibling match
These matching rules ensure that once a data group and a subform are bound, descendants of the data group are never bound to form nodes which are not descendants of the subform. This does not apply in the reverse direction, that is, descendants of the subform may be bound to nodes that are not descendants of the data group because of scope matching. The hierarchy of matches is not important when every field on a form has a unique name. It becomes important when fields in different data groups share the same name, although they are logically distinct. Depending on the exact structure of the form, data values sharing the name may be able to scope-match to each other's fields. For example, consider the following fragment from a passport application.
Note that there are two fields called lastname, and one subform containing a lastname field is descended from another subform containing a lastname field. This template is merged with the following data.
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The hypothetical result, if there was no matching hierarchy, is shown in the following figure.
Template DOM
application
Form DOM
application
Data DOM
application
lastname Abbot
sponsor
sponsor
sponsor
lastname
lastname Abbot
lastname Costello
lastname
lastname
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Template DOM
application
Form DOM
application
Data DOM
application
lastname Abbot
sponsor
sponsor
sponsor
lastname
lastname Costello
lastname Costello
lastname
lastname Abbot
Example 4.56 Modified passport template with no way to deduce proper binding
<template> <subform name="application"> <subform name="sponsor"> <field name="lastname"> </field> <!-- sponsor's last name --> <field name="lastname"> </field> <!-- applicant's last name --> </subform> </subform> </template>
This template does not bind correctly to the data. The data binding process has no way to know which field should bind to which data value. With nothing else to go by it binds them in document order, which in this case is incorrect. The form creator has two remedies. One remedy is to change a field name so that all field names are unique, but this requires either changing the data or modifying it on the way into the Data DOM using a configuration option as described in Creating, Updating, and Unloading a Basic XFA Data DOM on page 109. Or, one of the fields can be qualified with an explicit data reference so that it can only bind directly to the desired data value, as described in Explicit Data References on page 181. However the explicit data reference only works if the data always has the same hierarchy. Each remedy sacrifices some kind of data independence in order to disambiguate the match. Here is the same template fragment with an explicit data reference added to fix the problem,
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The result using this template fragment and the same data is shown in the following figure. This is the desired result.
Template DOM
application
Form DOM
application
Data DOM
application
lastname Abbot
sponsor
sponsor
sponsor
lastname
lastname
lastname Costello
lastname
lastname
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field with a numeric UI may bind to alphabetic data. This is considered normal and proper. The user is still constrained to enter a date when editing the field.
Transparent Nodes
In data binding, as in SOM expressions, certain template nodes (such as nameless subforms) are transparent. This means that data binding, like SOM expression resolution, behaves as though the transparent nodes were removed and their children adopted by the transparent node's parent. For example, if a nameless subform is wrapped around a field, the field still binds to the same data value in the same place in the data hierarchy. The data binding process does copy the transparent node into the Form DOM, so the Form DOM echoes the hierarchy of the Template DOM, but the form node which is a copy of a transparent node remains unbound. The following example shows the registration template with a nameless subform wrapping around the address information.
The following figure shows what results when this template is bound to the original data. All of the data bindings are still direct matches because the nameless subform is transparent.
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Template DOM
registration
Form DOM
registration
Data DOM
registration
first
last
apt
street
city
country
postalcode
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because they can not contain subforms or fields, for example pageSet nodes. See Template Features for Designing Static Forms on page 30 for more information about these objects. Again, these are copied into the Form DOM for use by scripts and other XFA subsystems.
Exclusion Groups
An exclusion group is a template construct that contains a set of fields, each of which has an activated state and a deactivated state. In an interactive context an exclusion group is normally presented to the user as either a set of radio buttons or a set of checkboxes. When presented as radio buttons not more than one member of the set can be activated at the same time. When one radio button is turned on (depressed) any other radio button in the group that was on is forced off (released). It is also permissible for every button to be off. By contrast, when an exclusion group is presented as check boxes the fields can be activated and deactivated independently. Each field within an exclusion group is associated with a key value. When a field is activated a variable is set to the key value for that field. At any time the field can tell whether it is on or off by comparing the value of the variable to its own key value. Exclusion groups are declared in the template via an exclGroup element enclosing the members of the set. In the following example, the exclusion group itself is named sex and it contains three radio button fields named male, female and NA (to represent a declined response). The field named male is on when and only when the controlling variable is "M". Similarly female is on when it is "F" and NA is on when it is "NA". For simplicity the accompanying GUI elements are not shown.
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Inside the Template DOM, the exclusion group is represented by a node, as shown at right. The node exists purely to encapsulate the logical relationship between its children. It is not itself displayable. If the exclusion group has a name, the exclusion group node itself may be supplied with content by the data. This is called the short exclusion format. In this case, the fields belonging to the exclusion group are left unbound. The fields rely on the value of their parent exclusion group to determine whether they are on or off. The following example shows short exclusion format.
Template DOM
main
sex
male on = M female on = F NA on = NA
After binding the above template to this data, the result is as shown in the following figure.
Template DOM
main
Form DOM
main
Data DOM
main
sex
sex
sex M
male on = M female on = F NA on = NA
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The following figure shows the result of binding the above template to this data.
Template DOM
main
Form DOM
main
Data DOM
main
sex
sex
male on = M female on = F NA on = NA
male M female NA
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During data binding, a field object having a multi-select choice list is bound to a data group, rather than to a data value. The value of the field object in the Form DOM is the concatenation of the values of all of that nodes children, with newlines between them. This includes children that do not match any of the items in the choice list. However, the choice list widget does not display values that are not in the list. For example, suppose the relevant data is as follows.
In this case the value of the grains field in the Form DOM is as follows:
rye barley wheat
Note that there is no newline after wheat. If the template supplies a default value, it must be in the same format. Although barley is in the value it does not appear in the choice list, so the multi-select choice widget ignores it. Instead it displays a list consisting of wheat, rye, and millet (in that order), with wheat and rye selected. The user can delete wheat, delete rye, or add millet, but the user has no way to remove the value barley. The DOMs for this example are shown below.
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grains
grains
items
items
text wheat
text wheat
text rye
text rye
text millet
text millet
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Failing to find a match for the apt field, the binding process extends the search to attributes of data values. It finds the apt attribute of the street data value and binds it to the apt field. This is useful with data produced by third-party programs which may choose to pass data in attributes rather than content. (There is no general rule in XML for deciding what should be an attribute and what should be content.) Attributes that are not needed to supply values for unbound fields or exclusion groups are ignored.
Re-Normalization (Step 4)
In certain cases, a data node may end up bound to a form node even though the nearest merge-able ancestor of the data node and the nearest merge-able ancestor of the form node are not bound to each other. XFA applications may provide an option to move data nodes around to reconcile these contradictions. This process is referred to as re-normalizing (or adjusting) the Data DOM. Re-normalization always does the least moving it can, so the data structure is kept as close to original structure as possible. If the application does not request this service, existing nodes in the Data DOM stay where they are. The template that was used above in Example 4.52 to illustrate scope matching will also serve to illustrate re-normalization. The template has the following skeleton:
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<field name="city"> </field> <field name="country"> </field> <field name="postalcode"> </field> </subform> </subform> </template>
The supplied data is also the same as Example 4.50. The data is repeated below for convenience.
The following figure shows the result of the data binding process, before re-normalization.
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Template DOM
registration
Form DOM
registration
Data DOM
registration
first
last
address
address
apt
street
city
country
postalcode
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Template DOM
registration
Form DOM
registration
Data DOM
registration
first
last
address
address
address
apt
street
city
country
postalcode
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Hence if the application reloads the resulting XML (that is, if the data makes a round trip) the application's data is forced into the structure laid out by the template. This is sometimes very useful, but it is also dangerous - a different template may produce a different restructuring of the data. Therefore the application designer must carefully consider the effects of the option. For a complete set of examples showing the ways in which the Data DOM can be altered by re-normalization, see the following illustrations. Note that in these illustrations the left side shows the original Data DOM (rather than the usual Template DOM). As shown in the following figure, value C (originally a child of Group A) is moved to become a child of Group B.
Form DOM
A
C XY B B B
C[0] XY C AB C[1] AB
C XY C AB
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As shown in the following figure, Group D is inserted and two values, C[0] and C[1], are moved to become children of the new group.
Form DOM
A
C[0] XY B MN C[1] PQ B MN D B MN D
C[0] XY C[1] PQ
C[0] XY C[1] PQ
Form DOM
A
B default = PQ C XY C XY C XY
B PQ
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data values can be taken from the XFA Data DOM or they can be obtained via connections to web services. This process is controlled by two properties, setProperty and bindItems.
The target can be almost any property of the containing object. The following restrictions apply.
It is not legal for the target to be the setProperty property itself or any of its subproperties. It is not legal for the target to be a bindItems property or any of its children. Both setProperty and bindItems are processed during a single phase of the data merge process and their respective order of evaluation is not guaranteed.
It is legal for the target to be the relevant, use or usehref property but it is not recommended. These properties are processed early and changing them afterward has no effect.
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It is legal for the target to be a bind-related property (such as the name property or any bind or occur subproperties) but it is not recommended. Specifying a bind-related property as the target is unlikely to yield a useful result. Processing of setProperty is done near the end of the merge operation when the bind-related properties have already had their effects. Changing them with setProperty has no effect on the current merge operation. It may however affect subsequent incremental merge operations. It is legal for the target to be the value property of the parent field or exclusion group, but it is not recommended. It is better to do an explicit data reference by setting the parents bind.match property to dataRef and the parents ref attribute to the target instead. By contrast when the parent is a draw object there is no way to specify an explicit data reference and it is proper and expected to specify its value property as the target of a setProperty.
Note that setProperty processing is a templating process, not a binding process. Whenever a merge is performed a snapshot of the specified data is copied into the specified properties. Subsequent updates to the data do not propagate into the target or vice-versa. This is appropriate because the targets of setProperty are things that the user does not normally have the ability to change interactively. Caution: Careless use of setProperty can create security vulnerabilities. It is up to the form creator to ensure that security is not compromised.
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The values of valueRef and labelRef must be SOM expressions. These expressions may contain ".." if desired. They are evaluated in the context of the data node to which the ref expression points. For example, the author of a form wishes to populate a choicelist with a set of credit cards. The set of credit cards is to be taken from the data file. The data contains the following structure.
The author accomplishes his goal using the following template fragment.
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Form Processing
Form processing is described as part of Updating the XML Data DOM for Changes Made to the XFA Data DOM on page 135.
Data Output
Data output is described in Unload Processing on page 136.
Example 5.1
<field1> <body xmlns="http://www.w3.org/1999/xhtml"> <p>The following <span style="font-weight:bold">word</span> is in bold.</p> </body> </field1>
The set of formatting markup supported by XFA processors is discussed in detail in Rich Text Reference on page 1039.
192
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Version Identifiers for Rich Text Producers and Rich Text Specifications
Rich text may be produced by a variety of sources and may include a range of XHTML and CSS features, not all of which are supported in XFA. XFA grammar adds version numbers as optional attributes in the rich text HTML body element. These attributes identify the version of the application producing the rich text (xfa:APIVersion) and identify the version of the rich text spec to which the rich text complies (xfa:spec). These attributes are described in Version Specification on page 1056.
Content type. The enclosing element bears a contentType attribute in the namespace http://www.xfa.org/schema/xfa-data/1.0/ with the value of text/html. Note: Do not use text/xhtml as the value for contentType; it is not recognized. Namespace. The element content belongs to the XHTML 1.0 namespace
Contained in exData with contentType="text/html". (The default value for contentType is "text/plain". Includes the XHTML namespace Rich text contained in <body> or <span> element
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Additionally, rich text should include an xfa:APIVersion attribute to indicate the rich text support it expects.
Properties of XFA Data DOM Objects That Represent Converted Rich Text
When the data loader recognizes rich text, it sets the contentType property of the dataValue node corresponding to the enclosing element to "text/html". This property tells rich text capable applications that they should look below the corresponding node of the XML Data DOM for the original rich text. As mentioned in About the XFA Data DOM on page 110, each node in the XFA Data DOM
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contains a pointer to the corresponding node in the XML Data DOM. However, XFA-SOM does not provide access to that pointer, so access from script to the XML Data DOM is application dependent. For example, the following XML fragment contains rich text. The rich text content is highlighted.
Example 5.2
<message> <p xmlns="http://www.w3.org/1999/xhtml"> You owe <b>$25.00</b>. Please pay up! </p> </message>
After loading, the above fragment is represented in the XFA Data DOM as follows.
[dataValue message = "You owe $25.00. Please pay up!" contentType="text/html"]
In addition to the above constraints, when specified via a contentType attribute on the enclosing element, the rich text content must have a single outer element. Only white space is allowed within the region of rich text content and outside the outer element. The data loader may emit a warning message when it encounters a construct that violates the above rule. How the application subsequently processes the affected content is implementation defined. The content in the following example is illegal because the rich text is not enclosed within a single outer element.
Example 5.3
<message xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/" xfa:contentType="text/html"> You owe <b>$25.00</b>. Please pay up! </message>
In the example, the message element is not part of the rich text because the contentType attribute applies to the content of the declaring element but not to the element itself. Hence, the rich text does not have include an enclosing element. However, it would not be a good idea to declare that the message element was part of the rich text, because HTML markup does not include a message element. Rather, the above example of illegal content could be made legal by wrapping the text in a span element as follows.
Example 5.4
<message xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/" xfa:contentType="text/html"> <span>You owe <b>$25.00</b>. Please pay up!</span> </message>
Properties of XFA Template DOM Objects That Represent Converted Rich Text
The template loader creates a node in the XFA Template DOM for the exData object. The node has nothing below it nor does it not have a value property. The exData object has a pointer into the XML (not XFA) Template DOM, which allows the XFA processing application to read the original rich text. Each node in the XFA Template DOM contains a pointer to the corresponding node in the XML Template DOM. However, XFA-SOM does not provide access to that pointer, so any access from scripts to the XML Template DOM is application dependent.
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The following presents several examples of template expressions related to rich text.
Example 5.5
<draw > <ui/> <value> <exData contentType="text/html" maxLength="0"> <body xmlns="http://www.w3.org/1999/xhtml" xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/" xfa:APIVersion="1.4.4136.0"><p>The Title of my <span style="font-style:italic">Document</span></p> </body> </exData> </value> </draw>
Example 5.6
<field > <caption reserve="18.26mm"> <value> <exData contentType="text/html" maxLength="0"> <body xmlns="http://www.w3.org/1999/xhtml" xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/" xfa:APIVersion="1.4.4136.0"> <p>Text<span style="xfa-spacerun:yes"> </span> <span style="font-weight:bold">Field</span></p> </body> </exData> </value> </caption> </field>
Example 5.7
<field > <ui> <textEdit allowRichText="1"> <border/> <margin/> </textEdit> </ui> <value> <exData contentType="text/html" maxLength="0"> <body xmlns="http://www.w3.org/1999/xhtml" xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/" xfa:APIVersion="1.4.4136.0"><p>A default data <span style="font-style:italic">Value</span></p> </body> </exData> </value> </field>
XML Data DOM In data update, plain text replaces rich text. XFA Data DOM
Rich text is not supported by the XFA processing application or the platform upon which it is running. For example, the platform is a cell phone with text entry via the keypad. User is not allowed to supply rich text, as indicated by the allowRichText property. For example, the content of the field is a name (which cannot usefully be styled) but the default value for the field is, in italics, the words Not supplied. Text data provided by a calculation.
Example 5.8
<subform> <field name="NOTICE"> <ui> </ui> <value> <exData contentType="text/html"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/"> <p>You owe us <span xfa:embed="AMOUNT_OWING" xfa:embedMode="formatted"/>! Please pay before the end of the month. </p> </html> </exData> </value>
In the example the default content of the NOTICE field is rich text which contains an embedded reference to the hidden AMOUNT_OWING field. Assuming that the value in the AMOUNT_OWING field is 52981.89, the NOTICE field is rendered as shown below.
You owe us $52,981.89! Please pay before the end of the month.
Prototypes
A form typically contains a great number of duplicated or similar objects; the same fonts, colors, borders, etc. are used repeatedly throughout the form. Often, there are objects such as lines, rectangles, and even whole field and draw objects repeated. This presents an opportunity to significantly reduce the file size of a form template, by factoring out the common aspects of the form into prototypical objects. As an additional benefit, the form designer may easily apply sweeping change to the form template by making changes to a prototypical object and any objects that are based upon that object will receive the changes.
Defining Prototypes
An element located anywhere in the template or in an external template can be used as a prototype. However it is often convenient to enclose an element in a proto element to indicate that it is included in the template purely for use as a prototype. Almost any XFA template element can be enclosed within a proto element. When enclosed this way the enclosed element plays no part in the form except when it is referenced by a use or usehref attribute on some other element. For example, the following fragment defines a prototype for a field element.
Example 6.1
<proto> <field id="LastNameProto" name="LastName" anchorType="middleLeft"> <ui> <textEdit multiLine="0"/> </ui> </font> </proto>
Even though the field is fully specified, it will never be directly visible or accessible to a form filling user, nor will it participate directly in data binding.
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Prototypes
200
The proto element itself can appear as a child of only the subform element. This isn't an undue restriction, as every template element is a descendant of some subform, except for the root-level subforms and their enclosing template element. The subform may hold more than one proto element for multiple prototypes, or the prototypes may be grouped in a single such element. The following two examples are equivalent.
Example 6.2
<subform> <proto> <color id="RED" value="255,0,0"/> </proto> <proto> <color id="GREEN" value="0,255,0"/> </proto> ... </subform>
Example 6.3
<subform> <proto> <color id="RED" value="255,0,0"/> <color id="GREEN" value="0,255,0"/> </proto> ... </subform>
Almost any template element can be a prototype. Notable exceptions include the proto and template elements.
Referencing Prototypes
An element can refer to a prototype through either its (the referencing elements) use or usehref attribute. These two attributes have similar effects but usehref is more flexible. The use attribute can only refer to an internal prototype - a prototype in the same template. By contrast usehref can also refer to an external prototype - a prototype in an external document. Any particular element can employ only one prototype. If both use and usehref are present and non-empty usehref is employed. The use attribute, if it is non-empty, holds a reference to the prototype to be used. The form of the reference can be either of
#ID expression
where ID is an XML ID string and expression is a SOM expression. For a successful reference to occur, the reference must refer to a single element that is located in the template packet of the document and is of the same type as the referencing element.
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Example 6.4
<proto> <font id="HELV-RED" typeface="Helvetica" size="10pt" weight="normal" posture="normal" > <color value="255,0,0"/> </font> </proto> <field ...> <font use="#HELV-RED"/> ... </field>
This defines a field whose font is red 10pt Helvetica regular. Note that several fields would likely reference this font prototype, thereby reducing file size and allowing for global format changes. The usehref attribute, when it is non-empty, holds a reference to a prototype which may be located in an external document. Although its function closely parallels the use attribute its syntax is different. The form of the reference in a usehref attribute can be any of
#ID
URI#ID
#som(expression)
URI#som(expression) URI
where URI is the Universal Resource Identifier for an external document, ID is the XML ID of the prototype, and expression is a SOM expression resolving to the prototype. When a URI is not supplied the prototype is in the referencing document. Again the reference must be in the template section of whatever document is referenced and must resolve to a single element of the same type as the referencing element. Note: Versions of this specification prior to XFA 2.6 showed "." used as the URI to refer to the current document. In fact the recommended practice is to refer to the current document by omitting the URI entirely. When a SOM expression is provided it is resolved in the context of the root XFA node, xfa. In practice the SOM expression is usually fully-qualified. When neither an XML ID nor a SOM expression is provided the expression #som($template.#subform.#subform) is assumed. In other words the default place to look is the first subform child of the root subform in the external documents template packet. Prototypes may reference other prototypes. In addition, descendant elements of a prototype may reference prototypes. For example, in the following template fragment a field invokes a font prototype called HELV-RED, which in turn invokes another font prototype called HELV. The relationship is similar to
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a superclass-subclass relationship in an object-oriented language. HELV-RED also invokes a color prototype called RED. This achieves the same result as the previous example.
Example 6.5
<proto> <color id="RED" value="255,0,0"/> <font id="HELV" typeface="helvetica" size="10pt" weight="regular" posture="upright" > </font> <font id="HELV-RED" use="HELV"> <color use="#RED"/> </font> </proto> <field ...> <font use="#HELV-RED"/> ... </field>
Caution: It is permissible for internal prototypes to reference external prototypes and vice versa. However when an external prototype references an internal prototype the internal prototype is resolved within the context of the source document, that is to say the original template. For example, in the following example a template in the file mytemp.xdp invokes an external prototype ClientSubform in myprot.xdp. This prototype in turn tries to make use of an internal prototype ClientNameField within myprot.xdp. This reference fails to resolve because the XFA processor tries to resolve it in mytemplate.xdp.
Example 6.6
Example 6.7
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It is possible for a template to improperly specify an endless loop of prototype references. For example, in the following template fragment a prototypes child invokes its own parent as a prototype.
Example 6.8
<proto> <subform name="Client" id="ClientSubform" ... > <subform name="ClientName" use="#ClientSubform" ... /> </subform> </proto>
It is the responsibility of the form creator to ensure that there are no endless prototyping loops.
The id attribute The name attribute The use attribute Any attributes specifically overridden in the referencing element
The data content of the prototype, unless specifically overridden All child elements of the prototype, unless specifically overridden
Where the referencing element does not explicitly provide values for attributes, child elements, and data content and no such values are inherited from the referenced prototype, application defaults shall apply. The term absolute omission describes such an absence of content.
Overriding Attributes
Any attribute present in an element overrides that attribute from the prototype. For example, the following template fragment defines two draw elements whose fonts both reference the 10pt Helvetica prototype. However, the second one overrides the font size with a size of 14pt, and so, it will draw with a font of 14pt Helvetica. In the first draw element's font, the font size was omitted, so it is inherited from the prototype.
Example 6.9
Overriding an attribute
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</font> </proto> <draw ...> <font use="#HELV-RED"/> <value> <text>Helvetica 10pt</text> </value> </draw> <draw ...> <font use="#HELV-RED" size="14pt"/> <value> <text>Helvetica 14pt</text> </value> </draw>
As implied in the previous paragraph, an attribute is considered to be omitted only if it was not explicitly specified with a value on an element. An attribute that is explicitly specified on an element with the value of an empty string is not considered to be omitted; as should be obvious, the attribute is specified as having the value of an empty string, which signifies the default.
Note: It is not possible to override prototype data content with empty data content.
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<value> <text/> </value> </field> </proto> <field use="#DEFAULT-FIELD" name="num" x="1in" y="1in" w="1in" h="14pt"> <border> <edge thickness="1pt"/> </border> <font typeface="Times" size="12pt"/> </field>
Child ui element: Omitted from both the referencing field and the prototype. Application default applies. Child border element: Present in the referencing field, but omitted from the prototype. Referencing field's border element applies, along with its child, edge element. Application defaults are invoked for any omitted border attributes. Child value element: Omitted from the referencing field, but present in the prototype. Referencing field inherits prototype's value element and its child text element. Child font element: Present in both the referencing field and the prototype. Referencing field's child font element inherits from prototype's child font element.
The last case is of special interest. Because a child font element is present in the both the prototype and the referencing field, we can recursively view the prototype's font element as being a prototype for the referencing field's font element. In consequence the referencing field will have a font of Times 12pt bold, colored red. When an element can have repeating child elements, overrides are matched by ordinal number. For example, consider the following prototype border element with two edge children.
The two edge children of the prototype border are taken as the top/bottom and left/right edges. Using the prototype without any overrides would therefore result in 2-pt edges along the top and bottom borders, and 1pt edges along the left and right. The prototype reference, however, overrides the first edge element. So, the result would be 3-point edges along the top and bottom of the border and 1-point edges at the left and right.
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Membership List
As shown (left), this year the club has only two members. The complete data document follows.
Membership List
John Betty Brown White
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Data DOM
Members
When this data is loaded into the Data DOM, the Data DOM has the structure shown at left. The two Member data groups can be individually referenced in SOM expressions as Member[0] and Member[1]. They are stored in the Data DOM in the same order that they occur in the data document. (Scripting Object Model on page 74)
First John
Last Brown
Member[1]
First Betty
Last White
Data DOM after loading data with repeated Member data group
Note that the template has three Member subforms and therefore has room for at most three lines of member information. If the data contains more than three Member data groups, only the first three will be bound into the form. Additional data groups will be loaded into the Data DOM but, because they are not
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bound, will not normally be processed. It is up to the application supplying the data to subdivide the data into separate documents of the appropriate size. This is an inherent limit of static forms. The figure at right shows the Template DOM after the above template has been loaded. When the template contains identically-named sibling subforms, there are three rules that control which data items are bound to which subforms. First, subforms are copied to the Form DOM and processed in the same order that they occur in the template. Thus The data binding process copies and seeks a match for Member[0] first, then Member[1], then Member[2]. Second, with one minor exception, each data node is only allowed to bind to a single form node. The exception is discussed below under Record Mode on page 215. Third, when searching for a match among identically-named sibling data nodes, the siblings are searched in data document order. The result of these three rules is that matching template and data node pairs are bound in sequence starting with the first of each in document order, as one would intuitively expect. In one possible implementation the data binding process traverses the Template DOM in document order. As it encounters nodes in the Template DOM it copies them into the Form DOM. After adding each node to the Form DOM it seeks a match in the Data DOM, excluding data nodes that are already bound and giving priority to data nodes that are earlier in document order. As described in Matching Hierarchy it seeks a direct match first, then any ancestor match, then any sibling match. When it finds a match it binds the data node to the form node. Then it moves on to the next template node in document order.
Template DOM
Members
Date
Member[0]
First Last
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The following figure shows the DOMs for the membership form after data binding.
Template DOM
Members
Form DOM
Members
Data DOM
Members
Date
Member[0]
First John
Last Brown
First John
Last Brown
Member[1]
Member[1]
First Betty
Last White
First Betty
Last White
Member[2]
First Last
First Last
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</Member> </Members>
With the data shown above, the Form DOM contains three Member subforms as before. However within the second Member subform the Last field (containing "White") precedes the First field (containing "Betty"), just as it does in the data. In addition, if a data value is missing the binding of the other data values is not affected. Suppose that the First data value ("John") had been missing from the first Member data group, as follows.
Example 6.16 Membership data missing a field without affecting the presentation
<?xml version="1.0"?> <Members> <Date>01/01/04</Date> <Member> <Last>Brown</Last> </Member> <Member> <First>Betty</First> <Last>White</Last> </Member> </Members>
After the bind operation the First field under the subform Member[0] would have been left unbound, and set to its default value. The First field under Member[1], however, would have been bound as before to the First data value containing "Betty". The Member data groups act as containers for the set of related data values, so that the contained data elements are grouped as intended. Another way to construct a static form is to place repeated field declarations within a single subform. When the template is constructed this way the data must have corresponding multiple data values with the same name within a single data group. The data binding process binds data values to fields in the same order that they are encountered in the data. This binding order results from hierarchy of matching priorities described above in Matching Hierarchy. For example, in the following template the member detail fields have been placed together in the Members subform.
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Template DOM
Members
Date
First[0]
When this is loaded into the Template DOM, the result is as shown at right.
First[1]
Last[0]
Last[1]
First[2]
Last[2]
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Similarly, the data has the corresponding data values directly under the Members data group, as shown at right.
Data DOM
Members
Date 01/01/04 First[0] John Last[0] Brown First[1] Betty Last[1] White
When the Template DOM is merged with the data, the rules of precedence cause field $form.Members.First[0] to bind to data node $data.Members.First[0], but field $form.Members.First[1] to bind to data node $data.Members.First[1]. Similarly each Last field binds to its corresponding Last data node, which is the desired behavior. The result is shown in the figure below.
Data DOM with repeated data values within the same data group
(
Template DOM
Members
Form DOM
Members
Data DOM
Members
Date
Date 01/01/04 First[0] John Last[0] Brown First[1] Betty Last[1] White
Date 01/01/04 First[0] John Last[0] Brown First[1] Betty Last[1] White
First[0]
Last[0]
First[1]
Last[1]
First[2]
First[2]
Last[2]
Last[2]
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When printed or displayed, the result is the same as the previous example (Filled Static Form as Printed on page 206). However this method of constructing the form has an important drawback. Suppose that John Browns first name is omitted from the data, as in example Membership data missing a field without affecting the presentation on page 210. For convenience the example data is reproduced below.
<?xml version="1.0"?> <Members> <Date>01/01/04</Date> <Last>Brown</Last> <First>Betty</First> <Last>White</Last> </Members>
In this case, when data binding takes place, the data value named First (containing Betty ) is bound not to $data.Members.First[1] but to $data.Members.First[0]. The result is that the membership list is printed as Betty Brown followed by a member with no first name and a last name of White, as shown at right. This result comes about because when the data is not grouped there is not enough information for the data binding algorithm to resolve ambiguity. There are two approaches to fixing this problem; either change the data document or use the data regrouping facility in the data loader. The data regrouping facility uses additional information supplied in the configuration to parse a flat sequence of data values and transform it inside the Data DOM into a series of data groups containing data values. See The groupParent Element on page 441.
Membership List
Betty Brown White
This is fully equivalent to the earlier representation using three repetitions of the Member subform declaration. The Form DOM that results from the data binding operation has the exact same structure
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except that multiple subforms in the Form DOM share the same prototype in the Template DOM, as shown in the following figure.
Template DOM
Members
Form DOM
Members
Data DOM
Members
Date
Last Brown
First John
Last Brown
Member[1]
Member[1]
First Betty
Last White
First Betty
Last White
Member[2]
First Last
Example 6.20 Using a default max attribute with fixed occurrence numbers
<template ...> <subform name="Members"> <field name="Date" ...>...</field> <subform name="Member"> <occur min="3" initial="3"/> <field name="First" ...>...</field> <field name="Last" ...>...</field> </subform> </subform> </template>
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Nested subforms and subform sets can have multiple occurrences at each level of nesting. The result is to compound the occurrences. For example, suppose a template has a subform Member which is set to occur three times, and Member contains a subform Name which is set to occur twice. This is exactly equivalent to a template containing three subforms called Member, each of which contains two subforms called Name. Note that fields do not have occur properties, hence can not automatically repeat. It is common to wrap a field in a subform simply to provide a way to associate an occur property indirectly with the field. In such cases it may be convenient to leave the subform nameless so it does not alter the SOM expression used to refer to the field in scripts. Alternatively, setting its scope property to none causes it to appear in SOM expressions but to be transparent to the data binding process so it has no effect on the data hierarchy. The occur property is more capabilities that are not depicted here. It can be used to make the form adapt itself to the data, repeating subforms as necessary. See the chapter Dynamic Forms on page 291 for a full description of this capability.
Record Mode
XFA processors can operate in two modes, record mode and non-record mode. The choice of mode is determined by option settings described in The record Element on page 456 and The range Element on page 455. In record mode, the data document is treated as a sequence of records. In the simplest case, each record in turn is loaded, processed, and unloaded before the next record is loaded. Record mode is provided purely as a way to reduce resource consumption (memory and CPU cycles) by XFA processors when dealing with large data documents. Anything that can be done in record mode can also be done in non-record mode providing sufficient resources are available. In non-record data binding proceeds as described under Forms With Uniquely Named Fields and Subforms. In record mode, for each record, all of the same processing steps except the last (issuing the form ready event) are executed in the same order before moving on to the next record. The last step, issuing the form ready event, occurs only after all records have been processed. Hence the cycle can be described as:
For each data record in document order { Create a new Form DOM Load globals before the current record into the Data DOM Load the current record into the Data DOM Create form nodes as copies of template nodes Match non-attribute data nodes to form nodes Match attributes to unmatched form nodes Renormalize the Form DOM Perform calculations and validations Pass the Form DOM to the layout process Delete the Form DOM Unload the record from the Data DOM (but keep the globals) } Issue the form ready event
A record is by definition a subtree of the Data DOM contained by a data group. All records are contained by data groups which are at the same level in the hierarchy of the Data DOM. These data groups may all be peers but they don't have to be they could have different ancestors. They may optionally be restricted to having the same names, so that data groups at the same level with different names are discarded. Alternatively records can be defined by level alone without any limitation by name.
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In the membership list example, record processing could easily be used. Each Member data group corresponds to a record. But suppose that there are two classes of members, full members and associate members. In the data full members are represented by a Member element while associate members are represented by an Associate element. The data document looks like this.
One possible approach is to arrange that all data groups one level below the outermost data group are treated as records. The effect of this is shown at right. Note that the date data value does not count as a record because records are only defined by data groups, not data values. In this case when records are defined by level in the hierarchy alone, records for both full members and associate members are processed. Note however that during data binding one or the other type of record may still be ignored, if it does not match structure in the template. For example, if the template does not contain any Associate subforms the associate member records, although present in the Data DOM, will not bind into the Form DOM.
Data Document
<?xml version="1.0"?> <Members> <Date>01/01/04</Date> <Member> <First>John</First> <Last>Brown</Last> </Member> <Associate> <First>Mary</First> <Last>Black</Last> </Associate> <Member> <First>Betty</First> <Last>White</Last> </Member> </Members>
Record 0
Record 1
Record 2
On the other hand it may be desired to Membership data with records defined by level process records for full members only. In that alone case the associate member records are not processed even if they match structure in the template. To accomplish this the XFA processor is configured to recognize only Member data groups as record containers. The effect of doing so is shown below.
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Data Document
<?xml version="1.0"?> <Members> <Date>01/01/04</Date> <Member> <First>John</First> <Last>Brown</Last> </Member> <Associate> <First>Mary</First> <Last>Black</Last> </Associate> <Member> <First>Betty</First> <Last>White</Last> </Member> </Members>
Record 0
Note that non-record mode is exactly equivalent to record mode with the mode options set such that the outermost level in the data hierarchy defines the record. In the example this is the level of the Members data group. The result is that the whole data document, apart from the processing instruction, is treated as a single record. The processing instruction is the line saying:
<?xml version="1.0"?>
Record 1
Processing instructions are never loaded into the Data DOM either in record more or non-record mode, as specified in Creating, Updating, and Unloading a Basic XFA Data DOM on page 109. Hence excluding the processing instruction from the record makes no difference.
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What if the data is not divided up into data groups? Suppose the data is in a flat stream of elements as follows.
The XFA configuration options allow for grouping transformations which operate when loading data into the Data DOM. The effect of a grouping transformation is to collect sets of related data values into data groups. This makes it possible to process flat data in record mode. See The groupParent Element on page 441 for more information about the grouping transformation.
Globals
In record mode most bindings are constrained to bind a child of the record subform with a child of the record data group. This is appropriate most of the time. However sometimes it is desired to reuse particular data values at different places throughout a form. This can be done using global data. Global data is any data value which is outside of any record and at the same level as or higher level than the record data groups. For example, consider the purchase order data with records corresponding to Detail subforms. With this record definition, all of the data values that are not inside Detail data groups are global. Global data can only bind to global fields. A global field is a field with a match attribute of global. Global fields are used for data which is only present in the data once but is presented multiple places in the form. For example, in a multi-page form it is common for a name or other identifier to be entered on the first page and reproduced on every page. The matching rules for globals are different from regular fields in order to support this usage. If a global field in the Form DOM can not be matched directly, a match is sought among global data values. This applies even if the binding process did not start at the root of the Data DOM, as in an incremental merge. For example, suppose the template is as follows.
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<field name="country"...> ... </field> <field name="postalcode"...> ... </field> </subform> </subform> </template>
In this example the application first presents the name subform to the user and gathers content for first and last. It uses this information to perform a database query, which returns the data. The application loads the data from the file into the Data DOM. Assume the data is as follows.
Assume also that record mode is enabled and the address data value contains the one and only record. Note that the data does not contain any data group corresponding to subform name. This is to be expected because the subform contains only global fields. Now, in order to present the second screen, the application requests a data binding operation with the address data group as the current data record. This limits most of the binding operation to the portion of the Data DOM below the address data group. The data nodes below address contain all the information specific to the second screen, so they bind in accordance with the usual rules. However the data for the first and last fields is not present below the data group address. Failing to find a match in the given subset of the data, and seeing that the fields are marked global, the data binding process searches for a global data value to match the fields. It finds the data for the global fields and binds the field nodes in the Form DOM to the appropriate data value nodes in the Data DOM. When searching for global data, the global data value can anywhere in the data document provided it is not inside a record and it has already been loaded. If the desired global data value comes after the current record it is necessary to adjust the data window to ensure the desired global data value is pre-loaded (see Data Window, below). The search ignores the depth of the global data value in the data hierarchy; instead it treats the Data DOM as though it was completely flattened. If there are multiple global data values matching the field, they are treated like siblings and the data binding process picks the one with the same index as the current record number. If an index is applied and the index is beyond the end of the list, the field is left unbound. Note that, unlike regular bindings but like explicit data references, there can be bindings from many global field nodes to the same data value node. For example, if in the example the application requests a data binding operation starting at the root of the Data DOM, the resulting Form DOM will have two global field nodes (one from each subform) bound to the first data value node, and two other global field nodes bound to the last data value node. Note: Fields in the template sharing the same name must either be all global or all non-global. A mixture of global and non-global fields with the same name is not supported. This restrictions prevents
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ambiguities when data is round-tripped between client and server, hence merged with the template, extracted and then merged again. Another difference between global fields and non-global fields is that global fields are strictly passive. A global field can never cause its ancestors to be copied into the Form DOM. Instead the field must be dragged in when its enclosing subform is dragged in by a direct or indirect match to a data node. Only then is an attempt made to match the global field to data in the current record, and if that fails to global data. There is also a difference between the handling of attributes in global data and non-global data. Attributes of global data elements can not bind to fields. All such attributes are ignored by the data binding process. As stated above, non-record mode is exactly equivalent to record mode with the mode options set such that the whole data document is treated as a single record. Hence in non-record mode there is no such thing as global data and marking a field as global has no effect.
Data Window
The placement of global data matters. If global data is placed after the record where it would be used, the data binding process may not yet have loaded it. This specification does not dictate that XFA processors perform two passes over the data document to pre-load globals. Rather, XFA processors support options to control the loading of adjacent records into the Data DOM along with the current record. This is known as a data window and it can include any specified number of records before and any specified number of records after the current record. In most cases global data naturally comes near the beginning of the document or just before the first record to use it. In other cases a larger data window is needed to ensure that all needed global data is loaded before it is needed. Explicit data references may be affected by the data window as well. A data reference can point to a data node in a record other than the current record. If there is currently no match for the explicit data reference in the Data DOM, the data binding process creates a node with default properties that matches the explicit reference. This is the same behavior it displays when the appropriate section of the Data DOM is loaded but there is no node matching the reference. Explicit data references should use $record to refer to data in the current record, $record[-1] to refer to the previous record, $record[+1] to refer to the next record and so on. For these references to work the data window must be set to include the desired adjacent records.
Container Elements
Compared to static XFAF forms, dynamic forms have additional types of containers. These include containers for:
Fixed content. In a dynamic form the boilerplate must be described in the template so that it can be laid out and rendered at run-time. Fixed content includes text, images, and basic line-drawings. Groups of containers. A dynamic form may assert a grouping which has no effect upon the user filling out the form but is useful to the form creator when modifying the form. Physical surfaces and regions. Additional information about the partitioning of space upon pages is required so that a dynamic form can be laid out at run time.
Draw
Forms invariably contain fixed content. This content, often referred to as boilerplate, typically provides context and assistance for consumers of the form. A draw element encloses each piece of fixed content. A user cannot directly interact with a draw element. Refer to the diagram A simple XFA form on page 21 for some examples of draw elements. Note that call-outs indicate only two of the many draw elements on the form. Note also that draw element content is not limited to text. For example, a line element is legitimate content for a draw element. The following is an example of a draw element that will produce the outline of a rectangle with the dimensions of one-inch square, positioned at an (x,y) coordinate of (0,0).
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Example 7.1
For more information, please see the syntax description of the draw element.
Example 7.2
<area x="1in" y="2in"> <field name="ModelNo" x="0" y="0" w="1in" h="12pt"/> <field name="SerialNo" x="0" y="16pt" w="1in" h="12pt"/> </area>
For more information, please see the syntax description of the area element.
Content Area
A contentArea element represents a rectangular region of a display surface. This always has a fixed size and a fixed position upon the page.
Page Area
A pageArea element represents a single display surface, for instance one side of a printed page. Depending upon the pagination strategy of the enclosing pageSet, pageArea elements may be restricted to certain contexts such as odd pages only or the first page in a series of pages only. For more information about pagination strategy see Flowing Between ContentArea Objects on page 259. It is the responsibility of the form creator, and the user when printing, to ensure that each individual page is big enough to hold the contentArea regions within it. It is the responsibility of the form creator to ensure that the template contains at least one pageArea element with a contentArea inside it.
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Page Set
A pageSet element represents an ordered set of display surfaces, for example a series of printed pages. A pageSet element may contain any number of child pageSet elements. For example, consider the following template fragment.
Example 7.3
<pageSet relation="duplexPaginated"> <pageSet relation="duplexPaginated"> <pageArea oddOrEven="odd" ... /> <pageArea oddOrEven="even" ... /> </pageSet> <pageSet relation="duplexPaginated"> <pageArea oddOrEven="odd" ... /> <pageArea oddOrEven="even" ... /> </pageSet> </pageSet>
In the above example each inner pageSet element contains two pageArea elements to represent the two sides of a duplex-printed page. The outer pageSet element groups all the duplex-printed pages together. In this case there are two pages, each printed on both sides, for a total of four printed surfaces.
Displayable layout elements includes those elements which have no other function than to be visually presented upon the display, such as text, images, and geometric figures. Elements descended from draw elements are also classified as displayable because draw elements merely provide packaging around one of the other types of displayable entities. Displayable entities may originate either from the template (boilerplate) or from user-supplied data. Structural layout elements embody relationships between displayable entities and/or other structural layout elements. Subform elements and exclusion group elements are examples of structural layout elements. Note that structural layout elements may also be visually presented upon the display, as for example a subform that has a border and/or a fill color.
In the context of layout, displayable layout elements are generally passive. That is, generally they are acted upon by other layout elements but have no effect upon other layout elements except by the simple act of taking up space. Physical layout elements, by contrast, are always active; they both act directly upon and set constraints upon other layout elements. For example, a block of text may flow across multiple contentArea elements and be split up by them. Structural layout elements become active when they possess non-default breakBefore or breakAfter properties. For example, usingthe breakBefore property a structural layout element may state that it must be kept intact, or that it must be displayed on the front surface of a page. The w (width) and h (height) properties of layout elements are particularly likely to be a source of confusion. The height of a contentArea is a constraint. For example when text being placed into a contentArea crosses the lower edge of the contentArea, the text may be split and only a fragment
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placed into the contentArea. By contrast if a height is specified for a subform, it is not a physical constraint but a logical property. Hence the supplied height does not affect the layout or actual size of the subform or its contents; it only affects how much height the layout processor reserves upon the page for the subform. Widths work the other way around. The width of a contentArea is not a physical constraint; the content placed into the contentArea can extend to the right of the contentArea. However the width of a subform may be a physical constraint; text may wrap when it reaches the right or left edge of the subform. (This asymmetry arises from the fact that XFA does not currently support languages such as Chinese that flow vertically with lines stacked horizontally. Probably any future version of XFA that supports such languages will expand the repertoire of contentArea elements to include splitting by width, and of subforms to include wrapping by height.) The following table summarizes the types of layout elements: Type physical layout content Subtype N/A structural Description physical display elements or regions thereof logical and some physical relationships between layout elements elements visibly presented upon the display Element pageSet, pageArea, contentArea subform, subformSet, area, exclGroup, field, draw text, image, line, arc, rectangle, barcode, push button, checkbox, radio button, choice list, text edit widget, date edit widget, time edit widget, password edit widget, image picker widget, signature widget
displayable
Layout Objects on page 1189 contains a table showing the characteristics and capabilities of each type of layout element.
Basic Composition
This section describes aspects of creating a template that are not applicable to static forms. Basic Layout in Dynamic Forms on page 232 describes how container elements are placed on a page.
Handedness
Any sort of a line, whether it be a line element or a border edge, follows a logical path. This path has zero width. During the process of rendering of the line, however, the application applies a thickness to create a visible line. Handedness provides the forms designer with a means to specify how that thickness is applied to the line.
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The stroke's thickness extends to left of the path this stroke is defined as left-handed The stroke's thickness extends equally to both the left and right of the path this stroke is defined as even-handed The stroke's thickness extends to right of the path this stroke is defined as right-handed
The following diagram illustrates the three possibilities, as three thick black strokes along a common path shown in green.
Example 7.4
<draw x="1in" y="1in" w="0.6in" h="0.8in"> <value> <line hand="left" slope="/"> <edge thickness="0.2in"/> </line> </value> </draw> <draw x="2in" y="1in" w="0.6in" h="0.8in"> <value> <line hand="even" slope="/"> <edge thickness="0.2in"/> </line> </value> </draw> <draw x="3in" y="1in" w="0.6in" h="0.8in"> <value> <line hand="right" slope="/"> <edge thickness="0.2in"/> </line>
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</value> </draw>
Left-handed borders draw just outside the nominal extent, thereby graphically freeing up the entire nominal extent for content Right-handed borders fit within the nominal extent, ensuring that the container element's graphical footprint doesn't exceed its nominal extent Even-handed borders allow for alignment of container elements by nominal extent, without unusually thick lines where they join
It is this last point that is of greatest use to a forms designer. If the stroked edges of a border are even-handed, the edges will appear to spread outside the container's nominal extent by half the edge thickness. Placing two objects with this type of border adjacent to each other will result in the common border edge between the two objects, appearing to have the same width as all the other edges this is very common in traditional form composition. If the border had been right-handed causing the stroked edges to be rendered completely inside the nominal extent, or left-handed causing the stroked edges to be rendered completely outside the nominal extent, there would appear to be a doubly thick border between the two objects. This effect of handedness on adjacent bordered objects is illustrated by the following diagram:
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Example 7.5
<field name="field1" x="1in" y="1in" w="1.5in" h="1in"> <border hand="right"> <edge thickness="0.125in"> <color value="128,128,255"/> </edge> </border> <value> <text/> </value> </field> <field name="field2" x="2.5in" y="1in" w="1.5in" h="1in"> <border hand="right"> <edge thickness="0.125in"> <color value="128,128,255"/> </edge> </border> <value> <text>Right-handed borders</text> </value> </field>
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<field name="field3" x="1in" y="2.5in" w="1.5in" h="1in"> <border hand="even"> <edge thickness="0.125in"> <color value="128,128,255"/> </edge> </border> <value> <text/> </value> </field> <field name="field4" x="2.5in" y="2.5in" w="1.5in" h="1in"> <border hand="even"> <edge thickness="0.125in"> <color value="128,128,255"/> </edge> </border> <value> <text>Even-handed borders</text> </value> </field> <field name="field5" x="1in" y="4in" w="1.5in" h="1in"> <border hand="left"> <edge thickness="0.125in"> <color value="128,128,255"/> </edge> </border> <value> <text/> </value> </field> <field name="field6" x="2.5in" y="4in" w="1.5in" h="1in"> <border hand="left"> <edge thickness="0.125in"> <color value="128,128,255"/> </edge> </border> <value> <text>Left-handed borders</text> </value> </field>
Content Types
The representation of fixed content using the draw element is similar to the representation of default content in a field element. The main difference is that fixed content can contain different types of content. Fixed content can be plain text, rich text, an image, or a geometric figure. Caution: Fixed content can not be any of the types that are subject to localization and/or validation. Thus it can not be a date element, a time element, a dateTime element, a boolean element, an integer element, a decimal element, or a float element.
Example 7.6
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<border/> <value> <arc sweepAngle="180"> <fill> <color value="255,0,0"/> </fill> </arc> </value> </draw>
Those content types which differ from variable content are described below.
Images
The image content type element may enclose an image. XFA forms may provide images as fixed content. Note: The image formats supported by an XFA processing is application dependent.
Example 7.7
<draw name="StaticImage1" y="3.3969mm" x="0mm" w="63.6586mm" h="17.5246mm"> <value> <image contentType="image/tif"> SUkqAAgAAAAVAP4ABAABAAAAAAAAAAABAwABAAAA0wIAAAEBAwABAAAA6QAAAAIBAwADAAAACgEA AAMBAwABAAAABQAAAAYBAwABAAAAAgAAABEBBAACAAAAEAEAABUBAwABAAAAAwAAABYBAwABAAAA </image> </value> </draw>
Example 7.8
<draw name="StaticImage2" w="79.12mm" h="28.84mm"> <value> <image href="http://www.example.org/pathname/Picture.jpg" contentType="image/jpg"/> </value> </draw>
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Icon buttons
A dynamic form may specify an image and also a text legend for a button. The image is supplied as the field default value and the legend as the field caption. In addition if the buttons highlight mode is push the button may specify different images and legends for each of the up, down, and rollover states. See Button on page 417 for more information.
Example 7.9
The flate-compressed stream, when expanded, yields bit-for-bit the contents of the original image file. The Catalog is the root of the documents object heirarcy and contains the optional Names dictionary. Each entry in this dictionary specifies the root of a name tree. The dictionary may be expanded and define
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other entries as XFA does here. XFA adds an entry called XFAImages. The XFAImages name tree contains a number of leaf nodes, which map keys to their values. In this case, the key is an image URI, which maps to a value which is an indirect reference to an object. The image object has to be linked to the URI that it represents. This is done via a name tree called XFAImages. XFAImages is located in the Names dictionary which is under Catalog, the root of the PDF object hierarchy. The PDF reference [PDF] enumerates the entries which are commonly used within PDF files (see section 3.6.3 Name Dictionary). For the example the content of XFAImages is as follows.
The first key is for the URI .\9Heads_300.jpg. It maps to the indirect object 42, which was defined in the example above. The double-backslash (\\) in the name string represents a single literal backslash, using the usual PDF encoding rules. The other image files used by the form are .\anneb.jpg, .\butterfly.jpg, and .\fish.jpg, and each one maps to its own object. Within the XFA template there is no new syntax. Each reference to an image uses the filename as a URI. For example, 9Heads_300.jpg is used as follows.
Similarly within the XFA data document the existing syntax for URI references is used. (See Image referenced using a URI on page 135.) There is no change in XFA syntax, only in interpretation.
The min attribute is used when processing a form that contains data. Regardless of the data at least this number of instances is included. It is permissible to set this value to zero, in which case the container is
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entirely excluded if there is no data for it. When this attribute is not supplied the internal min property defaults to 1.
The max attribute is also used when processing a form that contains data. Regardless of the data no more than this number of instances may be included. It is permissible to set the max attribute to -1, in which case there is no limit to the number of instances. When this attribute is not supplied the internal max property duplicates the value of the internal min property. The initial attribute is used only when the XFA processor is printing or displaying a blank form. In this circumstance this attribute determines how many instances of the container should be used. When the attribute is not supplied the internal initial property duplicates the value of the internal min property.
Both subform and subformSet elements can contain occur elements. In these contexts the occurrence limits control how many times they are copied into the Form DOM during a merge operation. The influence of occurrence limits on merge operations is discussed in detail in The Occur Element on page 296. By contrast pageArea and pageSet elements can also contain occur elements, but in these contexts the occurrence limits control how many times they are copied into the Layout DOM during layout. For these elements the initial occurrence attribute has no effect. The effects of occurrence limits on layout are described in detail in Flowing Between ContentArea Objects on page 259. It is permitted to set the minimum and maximum occurrences to the same value. If the value is anything other than 1 the effect is to force the full dynamic logic to be invoked but to constrain it so that it operates in a pseudo-static manner. When used this way the result is equivalent to repeating the container element N times in the template. For more information see Using Fixed Multiple Occurrences for Pseudo-Static Forms on page 312.
Box Model
The layout processor uses the same box model that has already been described for static forms. There are some additional element types in dynamic forms which take part in the layout process. The box models for those additional element types are described below.
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Area
An area element represents a grouping of related objects. Area objects grow to the minimum size required to hold the nominal extents of all the layout objects they contain. Area objects do not have margins or borders of their own. These rules make an area element largely transparent to the layout process. However when an object within the area object uses positioned layout the X and Y positions are specified relative to the area object. Hence area elements are convenient for bundling objects that are to be dropped into a form and moved around as a unit.
Geometric Figure
Geometric figures supported by XFA include straight lines, arcs, and rectangles. Arcs and rectangles can be filled. These figures are inherently scalable in the sense that the figure grows or shrinks to fit the content region of the container. However line width does not change with the figure size. The figure at right shows a straight line layout object within its container.
top margin left margin right margin
line
bottom margin
PageSet Element
A pageSet element represents a set of display surfaces, such as a stack of sheets of paper. Width and height do not apply.
PageArea Element
A pageArea represents a display surface, such as one side of a page. Its actual size is unknown (and irrelevant) to the layout processor. A pageArea element may contain content such as subforms. Such content, which is placed directly in a pageArea element, represents page background. It is up to the creator of the template to ensure that page background and any contentArea elements contained in the pageArea do not extend beyond the usable area of the surface.
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Layout Strategies
Dynamic forms may use a positioned layout strategy in which every subform is directly linked to a named contentArea. The resulting form can still adapt to the data by including different pages as appropriate. Alternatively dynamic forms can use a flowing layout strategy in which content flows through a series of content areas. Both fixed and variable content flow so that the user data is surrounded by all of the appropriate boilerplate. Flowing layout allows a form that contains just those subsections that are needed for the data. In addition flowing layout can interpose such additional elements as headers and footers to enhance the appearance of the form. Finally, dynamic forms can lay out objects aligned in rows and columns to form tables. The tables adapt to the size of the individual cells making up the rows and columns. Dynamic forms may contain a mixture of objects laid out using different layout strategies. In fact this is inevitable because flowing is the only layout strategy available for text inside any container, whereas positioned is the only layout strategy for any container placed inside a contentArea region. For all other containers the default layout strategy is positioned but flowing may be specified on a per-container basis. Note that static forms, because they do not specify any layout strategy, implicitly use a flowing layout strategy for text but a positioned layout strategy for all other objects. The position of each field is specified relative to the top left corner of its containing subform, and the subform is implicitly positioned to the top left of the printable region of the page. Flowed layout for the special case of text is described in Alignment and Justification on page 42. The following section describes the rules for positioned layout. Flowed layout for container objects is described in Flowing Layout for Containers on page 246.
Positioned Layout
When using positioned layout each contained object has a fixed offset vector (an (x,y) pair) which determines the location of the contained object with respect to its container. By default (and typically) the vector gives the offset of the contained object's top-left corner from the container's top-left corner. The offset vector is supplied as properties named x and y. The x property is interpreted as a measurement to the right and the y property as a measurement down from the top-left-corner of the container. The values of these properties must be measurements as described in Measurements on page 34. If there is no x or y property for a contained object a value of 0 is assumed by the layout processor. For example, assume a template as follows.
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</subform>
Assume that the data binding process resulted in the text "field B content" being associated with field B and "field C content" with field C. The resulting layout is reproduced at right, with some coordinates labelled. (0,0) is the origin of the pageArea. (2,2) is the location of the top-left corner of the contentArea, while (15,17) is its lower-right corner. Field B is placed 2cm down and 2 cm to the right of the top-left corner of its container, the subform. Hence field B's top-left corner is placed at (4,4). This form also includes background text. Background objects are explained in Page Background on page 238. Here the important things to observe are that positioned layout is used for this block of background text and that it is positioned relative to its own container, the pageArea itself. A contained object may specify an anchor point which is the reference point for its offset. The default is its top-left corner. However the offset is always specified with respect to the container's top-left corner regardless of the container's own anchor point. The anchor point is one of the following points within the object's nominal extent:
top left corner middle of the top edge top right corner middle of the left edge center middle of the right edge bottom left corner middle of the bottom edge bottom right corner
The anchor point affects the direction in which the contained object grows if its width and height are increased. For example, if the template is modified to increase the height of field C, and the anchor point of C is at the top-left, the field extends farther down the page but its top-left corner stays at (4,9). However if its lower-right corner was the anchor point then increasing its height would cause its top-left corner to move up the page while the lower-right corner stayed fixed.
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The template may specify offset vectors that cause contained objects to be placed partly or entirely beyond the right or bottom limits of their containers, or to overlap each other. It is not the layout processor's job to second-guess the offset vectors. However, this is no guarantee that overlapped objects will render properly on all output devices. No objects may include x or y values that are negative or that resolve to negative numbers after conversion from the given anchor point to the top-left corner. In other words, the nominal extents of objects must not extend beyond the top and left limits of their containers. The figure at right shows an example of permitted practice, in which the container's size is fixed and the objects contained within it both overlap each other and extend beyond the nominal extent of the container, but in an allowed direction. The layout processor employs positioned layout within any area, pageArea, or contentArea object. It also employs positioned layout within any draw object containing an arc, line, or rectangle. And, it employs positioned layout within any subform that has no layout attribute or has a layout property with the value of positioned. Exclusion groups are transparent to layout strategy, that is, they inherit their layout strategies from their parents.
Content B
contentArea A
Content D
Content E
Content C
Positioned layout
Clipping
When a container has a fixed size, the content does not fit into the container, and the layout strategy is positioned, the excess content may either extend beyond the region of the container or be clipped. The permissible range of actions varies according to the type of container and the context (interactive or non-interactive). When the container is a field and the context is interactive, the content of the field may be clipped. However some means must be provided to access the entire content. For example, the XFA application might arrange that when a field gains focus a widget pops up. The widget could be dynamically sized or it could support scrolling. When the container is a field and the context is non-interactive (for example printing to paper) the content must not be clipped. The content may be allowed to extend beyond the field or it may be shrunk to fit the field. When the container is a draw, in any context, the behavior is implementation-defined. It is the responsibility of the form creator to ensure that the region is big enough to hold the content. Note that clipping does not have to be done by the layout processor. If it is done at all it can be done downstream in the renderer. However it may be advantageous to do partial clipping at the layout stage. For example, when justifying it is more efficient to stop adding text after the last line that is wholly or partly inside the content region.
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Page Selection
In static XFAF forms the physical sequence of pages is simply the order in which the pages appear in the PDF. However in dynamic forms the physical sequence of pages is controlled from within XFA using the pageSet, pageArea, and contentArea elements. Each pageArea element along with its contained contentArea elements describes the physical layout of one display surface (for example one side of a printed sheet of paper). Any subform can use its breakBefore property to specify that it must appear on a display surface described by a particular pageArea object, or in content area described by a particular contentArea object. XFA provides additional ways to control pagination but for many forms this is all that is needed. The breakBefore property is discussed in more detail in Break Conditions on page 237. When a subform asserts a breakBefore property the layout processor attempts to satisfy it within the current page. For example, if the subform being laid out specifies a break to a content area named xyz, the layout processor looks for an unused contentArea with the name xyz within the current pageArea. (Potentially the page could have many content areas with the same name). If it cannot satisfy the break request using the current page it performs whatever completion actions are required for the current page and then starts a new page and content area that satisfy the request. The new page may be based upon the same pageArea as the previous page or a different pageArea. The mechanism by which the layout processor determines which pageArea to use next is described in detail in Pagination Strategies on page 259.
Break Conditions
In XFA pieces of displayable content are not tied directly to particular content areas or pages. Instead each subform has a breakBefore property which controls what the layout processor does when it is about to lay down that subform. It also has a breakAfter property which controls what it does after it lays down the subform. Both the breakBefore and breakAfter properties have targetType subproperties which specify whether the target of the break is a pageArea or a contentArea. For many simple forms the targetType subproperty of the breakBefore property for each subform is set to contentArea. This causes the
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layout processor to place each subform into the next available content area on the current page. If there are no more content areas on the page, the layout processor moves on to the next available page within the page set and uses the first content area on that page. There are several different ways in which the next available page can be determined; see Pagination Strategies on page 259 for more information. The layout processor maintains a count of instances used for each page set and, when the count is exhausted, ascends a level in the template looking for an unused page set. When it has exhausted the last page set, or if it runs out of displayable entities to lay down, it stops. The targetType subproperty of a breakBefore property can also be set to the value pageArea. This causes the layout processor to treat the current page as though all of its contentArea regions have been used. It advances to the first content area of the next page without putting anything more on the current page. Using this a single pageArea can be used to accommodate more or fewer subforms, depending upon the type of subform. The breakBefore or breakAfter property may also hold a script. If there is a script the layout processor executes the script to determine whether or not to perform the associated break action. The script must return a Boolean value. If the script returns True the break action is taken. If the script returns False the break action is not taken, that is the breakBefore or breakAfter has no effect. In the absence of a script the break action is always taken..
Page Background
A pageArea may contain subforms, fields, draw objects and area objects. Typically, this is used for letterhead, watermark, and/or identifying data such as a purchase order number. The layout processor makes no attempt to detect or prevent overlaps between background and foreground objects. Consider the following example.
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The resulting layout incorporates the Preliminary.jpg image as background in each instance of pageArea A, as shown at right. Structural layout objects used in background content may use either positioned or flowing layout. Fields contained in page background are somewhat restricted compared to ordinary fields. A field in page background can be a container for data, but it has to be linked to the data by an explicit data reference. See Explicit Data References on page 181 for more information. A field in page background can have calculate and validate scripts just as ordinary fields can.
subform C
Pr el im
contentArea B
pageArea A
in
ar y
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Property
use, usehref
No use allowed.
hand = "even","left"
Only right-hand borders (inside the widget) are handled by XFA. Even and left-hand borders are delegated to the PDF appearance stream.
Acrobat only supports caption on buttons and barcodes, but other implementations may support captions on other fields. No use allowed. Pagination is delegated to the PDF appearance stream. No use allowed. Draws are delegated to the PDF appearance stream.
border colSpans margin
No use allowed. Print control is delegated to the PDF appearance stream. No use allowed. Single occurrences only. No use allowed. Pagination is delegated to the PDF appearance stream. No use allowed. Pagination is delegated to the PDF appearance stream. Prototypes are not allowed.
instanceManager object
Scripts must not modify the number or order of objects in the Form DOM.
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Element
subform
Property
anchorType allowMacro bookend border break breakBefore, breakAfter colSpan, columnWidths h,w keep layout locale margin minH, maxH minW, maxW occur overflow pageSet para x,y
Note Allowed but only to express the form logic, not to vary the appearance or number of instances.
subformSet
242
Growable Containers
An XFA template may contain growable container elements, which means the containers size may change. Growable objects are very useful in form processing environments. Growth may occur along either the X and Y axes as follows:
Growable along both X- and Y-axes. An application of this feature is a region of freeform text on a form with no imposed width to force word-wrapping, and no limit on height. Growable along the Y-axis only. An application of this feature is the body text field of a memorandum form where many lines of input causes the field to grow vertically. Growable along the X-axis only. An application of this feature is a field that accommodates a product part number of indeterminate length.
The dimensions of non-growable container objects are determined from the outside-in. In contrast, the dimensions of a growable container are determined from the inside-out.
Non-growable container dimensions. When a form-designer uses a GUI-based template design application to place an container object on the template, the software application typically works form the outside-in. That is, it starts with the rectangle drawn by the designer and applies the margins to determine the available nominal content region. Growable container dimensions. The growability of a container object becomes apparent during form fill-in. When a container object is growable, the XFA processing application typically works from the inside-out. It computes a content region from the container's contents and then applies the margins to determine a dynamic nominal extent.
Container supports growth. The containers content type or ui supports growth. Most container elements with widget properties are growable, but container elements with arcs, lines, or rectangles properties are not. The Appendix Layout Objects on page 1189 specifies the content types and uis that support growth. Container omits one or both fixed size attributes. The container omits a fixed dimension (h or w) along one or both axes. The presence of the h or w attributes with non-empty values fixes the height or width of a container. The absence of those attributes in a growable container indicates the axis/axes along which the container may grown, as described in the following table. Axis along which container grows None
Non-null attribute h w
Explanation If both h and w are non-null, the container is not growable on either axis. Any minW/minH/maxW/MaxH values are ignored. An example of a fixed-size container follows:
<field name="text_field" h="1in" w=".5in"/>
Note: The default value for w and h are null, the default value for minH and minW is 0, and the default value for maxH and maxW is infinity. X If h is specified (non-null) and w is null, the container is horizontally growable and vertically fixed. Any minH/maxH values are ignored.
Non-null attribute h w
Explanation If w is specified (non-null) and h is null, the container is vertically growable and horizontally fixed. Any minW/maxW values are irrelevant. Examples of containers that are growable only in the X axis follows:
<field name="A" w="2in" minH=".5in" maxH="3in"/> <field name="A" w="2in" /> <subform name="B" w="6in" minH="1in" maxH="5in"/>
X and Y
If neither h nor w is specified, the container is growable on both axes. Example of containers that are growable in both the X and Y axes follows:
<field name="A" minH=".5in" maxH="3in" minW="1in" maxW="3in"/> <field name="A"/>
For those draws and fields that do not support the notion of growableness (such as arcs and rects) the minW and/or minH are used in the absence of a specified w or h attribute.
Forbidden condition: value of -1 not allowed for minH, maxH, minW, or maxW
If both minimum and maximum widths are supplied for the same element the minimum width must be smaller than or equal to the maximum width. Similarly if both minimum and maximum heights are supplied for the same element the minimum height must be smaller than or equal to the maximum height. However it is anticipated that layout processors will encounter some templates that are not conforming in this way. In such a case the layout processor should emit a warning and swap the offending maximum and minimum.
Warning condition: maxW/H should be null or non-zero
Example 8.1
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nominal extent both before and after the size changes. It's up to the object to manage this in a way that is intuitive for users of the object. It may be helpful to think of transformations as occurring after growth. An object establishes its new nominal content region in the coordinates it is comfortable with. Next, applies the box model embellishment. Only then does it do transformations.
Extent of a paragraph
The figure at right shows the layout extent, or bounding box, of a sample paragraph in solid black. The draw object containing the paragraph is being placed into a contentArea object. The extent of the contentArea is shown in dashed black. If the field is positioned using its upper-left corner, lower-left corner, or the middle of the left edge it grows to the right. That is, growth occurs by moving the left edge right on the page. If it is positioned using its upper-right corner, lower-right corner, or the middle of the right edge it grows to the left. If the field is positioned using either the middle of its top edge or the middle of its bottom edge it grows equally to the right and left.
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The hAlign attribute governs the placement of text within the container. When the container grows to the left and hAlign has a value of left, or the container grows to the right and hAlign has a value of right, the hAlign setting forces the container to grow as much as it can within its own container, even when the text does not fill it. See the following section for an illustration of a similar effect produced in the vertical direction by vAlign.
To be, or not to be: that is the question: Whether 'tis nobler in the mind to suffer The slings and arrows of outrageous fortune, Or to take arms against a sea of troubles, And by opposing end them?
caption region of field The vAlign attribute governs the placement of text within the container. When the container grows downward and vAlign has a value of bottom, or the container grows upward and vAlign has a value of top, field the vAlign setting forces the container to grow as much Effect of the vAlign attribute as it can within its own container, even when the text does not fill it. In the illustration at right, the paragraph has a vAlign attribute of bottom, an hAlign attribute of left, and a region reserved for a caption. The field was placed within the contentArea using positioned layout, which set the position of the field's top-left corner. However as the field is growable and bottom-alignment was specified, the field has grown to the bottom of the contentArea. The user-supplied text in the field is positioned just above the caption region. There is not enough text to fill the usable region of the field.
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property which specifies the type of layout to be used for the content of the subform. The contained objects (children of the subform node), if they are themselves containers, may in turn specify some other layout strategy within themselves. If a subform element does not have a layout attribute it defaults to positioned layout. Finally, fields and draws containing text always use flowing layout. It is important to distinguish the layout strategy used by a container for its own content and the strategy controlling the placement of the container itself within the object that contains it. For example the contents of a field always flow but the field as a whole may be positioned or it may flow. Note that, because the root subform has no container, unlike all other layout object it is not controlled by the layout strategy of its container. Instead the root subform itself is treated as though it (but not necessarily its content) flows across the entire document. For example, if the root subform has visible borders, the borders are displayed on every page.
Top-to-Bottom Layout
In top-to-bottom layout the layout processor attempts to place the first contained object at the top-left of the container. If this succeeds it attempts to place the next contained object immediately below the nominal extent of the previous contained object and aligned with the left edge of the container, and repeats for the remaining contained objects. If it comes to an object that will not fit in the remaining height of the container, it attempts to split the object horizontally as discussed in Content Splitting on page 255. If it is able to split the object it places the top fragment of the split object into the current container immediately below the nominal extent of the previous object. In the example at right, content F has been split and the top fragment placed into contentArea A. Also note that content D extends past the right edge of the contentArea; splitting is not done in the vertical direction. The layout processor employs top-to-bottom layout within any subform having a layout property with a value of tb.
Content B
contentArea A
Top-to-bottom layout
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For example, the document at right has a single container into which seven layout objects have been placed using left-to-right top-to-bottom tiled layout. The layout objects were placed in order from B through H. The layout processor employs left-to-right top-to-bottom tiled layout within any subform having a layout property with a value of lr-tb. It also defaults to this layout strategy when laying out text within a draw or field object, unless the locale property of the draw or field names a locale in which text normally flows right-to-left and top-to-bottom. See Flowing Text Within a Container on page 53 for more detail about text layout. When used for text, this type of flowing layout suffices for languages that are written left-to-right, with successive lines stacked top-to-bottom in the European style. It does not suffice for languages written from right-to-left (such as Arabic), nor for languages written top-to-bottom (such as Chinese).
Content B
Content C
Content E Content D
Content F
Content F
Content E
contentArea A
The layout processor employs right-to-left top-to-bottom tiled layout within any subform having a layout property with a Right-to-left top-to-bottom layout value of rl-tb. It also defaults to this layout strategy when laying out text within a draw or field object provided the locale property of the draw or field names a locale in which text normally flows right-to-left and top-to-bottom.
Error Condition: Inappropriate Layout Strategy
If a layout container has a layout property with a value that is a valid keyword but is not applicable to that container's contents, the layout processor should issue a warning and ignore the offending property. It is likely that some of the restrictions will be relaxed in future versions of this specification. The recommended behavior assures that the form can still be processed, although probably not with the expected appearance. The set of inappropriate layout strategies consists of:
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Positioned layout applied to text Flowing layout applied to a geometric figure inside a draw that does not assert w and h properties (because such a geometric figure has no natural size) Flowing layout applied to a subform that is a leader or trailer or is contained within a leader or trailer subform (because the leader or trailer size is fixed)
Example 8.2
<subform name="MySubform" layout="tb"> <field name="FieldA" w="100mm" minH="10mm" maxH="100mm"/> <field name="FieldB" w="100mm" minH="10mm" maxH="100mm"/> </subform>
contentArea A
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If a non-interactive bind process associates FieldA with data that exceeds the minimum vertical height specified for the field (minH), the layout processor grows the field vertically to accommodate the text and rearranges the subsequent fields. The illustration at right shows the vertical growth of FieldA and the relocation of FieldB, and the following depicts the Form DOM after new data is bound to FieldA and FieldB.
[subform (MySubform) layout="tb"] [field (FieldA) = "To be or not to be " w="100mm" minH="10mm" maxH="100mm"] [field (FieldB) = "Hello world." w="100mm" minH="10mm" maxH="100mm"]
FieldA To be or not to be, that is the question. Whether 'tis nobler in the mind to bear the slings and arrows of outrageous fortune, or to take arms against a sea of troubles and by opposing end them? FieldB Hello world.
contentArea A
Growable fields after being bound with data (non-interactive) Interactive Form Fill-In
If a person filling out a form interactively provides new data to the growable fields illustrated above, the field is not required to change shape. Rather, the layout processor may clip the new data, as described in Clipping on page 51. However if it does so then whenever the field has input focus the user interface provides scroll bars or some other mechanism to make available the full content of the field.
FieldB
Example 8.3
<subform name="MySubform" layout="tb"> <field name="FieldA" rotate="90" w="100mm" minH="10mm" maxH="100mm"/> <field name="FieldB" rotate="90" w="100mm" minH="10mm" maxH="100mm"/> </subform>
Hello world.
contentArea A
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Among sibling pageArea objects, the document order determines the page order; the leftmost (eldest) sibling is the first (lowest page number) in the document. This is illustrated below.
Later pages are, by convention, placed toward the back of the document. However printers actually print the lower-numbered pages first. Hence the same principle is observed as for displayable objects; pages are printed and objects are rendered in document order.
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Example 8.4
<template > <subform Name="A" layout="position" > <!-- root subform --> <pageSet > <pageArea name="X"> <draw name="XBackground" x="1cm" y="22cm" > <text >background text</text> </draw> <contentArea name="Y" x="2cm" y="2cm" w="13cm" h="18cm" />
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</pageArea> </pageSet> <draw name="ABoilerplate" x="1cm" y="12cm" > <text >boilerplate text</text> </draw> <field name="B" x="2cm" y="2cm" > </field> <field name="C" x="2cm" y="7cm" > </field> </subform> </template>
The layout processor starts by copying the pageArea into the Layout DOM and then adding a copy of the background text. At this point it is ready to begin inserting foreground objects. It copies the contentArea object into the Layout DOM. It initializes the current content node as the root subform, which is subform A. It adds a copy the root subform as a child of the contentArea. Then it looks for the next content node, which is field B, so it adds field B into the Layout DOM as a child of the subform. Continuing with the children of the subform, it places field C and the boilerplate into the Layout DOM. The resulting Layout DOM contains:
[root] [pageSet] [pageArea (X)] [draw (XBackground) x="1cm" y="22cm"] [drawText = "background text"] [contentArea (Y) layout="position"] [subform (A)] [field (B) = "field B content" x="2cm" y="2cm"] [field (C) = "field C content" x="2cm" y="7cm"] [draw (ABoilerplate) x="1cm" y="12cm"] [text = "boilerplate text"]
In this case the Layout DOM is not much more than a reordering of the Form DOM. This example is simple because all of the content fits into its assigned region of the page. The reordering is done to give each displayable entity its proper Z-order. The background text is placed ahead of its peers in the Layout DOM so that when rendered it will be on the bottom, overlaid by anything else that may happen to overlap it. When putting children of a pageArea into the Layout DOM the layout processor places displayable entities that are immediate children of a pageArea ahead of any other children. In all other cases the layout processor retains the document order of the DOM from which it is copying so that the Z-ordering is preserved.
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The resulting page from the example would be rendered as shown at right.
field B content
Error Handling
A layout processor may encounter a template which does not conform to this specification. The template may simply be defective, or it might have been constructed using a newer version of the specification. In the event of template non-conformity it is desirable for the layout processor to emit a warning but keep on processing and produce output, even if the visual appearance is degraded. This fail-soft capability ensures that data can still be viewed and operated on if at all possible. This specification describes recommended behaviors for coping with non-conforming templates.
subform A field C content
Content Overflow
When a layout object is too tall to fit into the remaining vertical portion of a content region, any of several things can happen. The layout processor may place the object into the current region even though it does not fit, either clipping it or allowing it to extend past the limits of the region. It may decide not to place the object into that content region at all, deferring it to the next content region. Or it may split the object, putting the top of it into the current region and the rest into the next available region. Caution: Deferral and splitting are characteristics of a flowing layout strategy. However a layout object may be a candidate for deferral or splitting even if its immediate container practices positioned layout. This comes about when the container is itself positioned by its container using flowing layout. Indeed it can happen when any container of the object (any ancestor in the Layout DOM) uses flowing layout. The individual object has a single position relative to the other positioned contents of its immediate container, but the entire container may be split as it flows. Splitting the container may split the contents. Clipping, including shrinking the content to fit into the region, does not have any explicit controls. The rules governing clipping are described in Clipping on page 51. Deferral can be controlled via the breakBefore or BreakAfter property of an object. The constraints specified by this property can cause the object to be directed to a particular content area. See Break Conditions on page 237 for more information. Deferral can also be constrained by a requirement that adjacent subforms be kept together. SeeAdhesion on page 270 for more information. An object can be protected from splitting by placing an explicit constraint upon it. In addition, different types of objects are splittable only in certain places or not splittable at all. The rules for splitting are described in Content Splitting (below).
Content Splitting
Splitting is not trivial. Splitting within a top or bottom margin is not allowed because it would defeat the purpose of declaring the margin. A simple multiline block of text cannot split at just any height, because
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most split lines would cut through characters of text. The multiline block of text can only split at discrete locations that fall between the lines of text. Some other objects (such as images) cannot split at all. The details of where and how various objects can split are described below.
Split Restrictions
Splitting is always forbidden within top and bottom margins. In addition, some types of content can not be split. The restrictions applying to different types of content follow.
Barcode
No split is allowed.
Geometric figure
No split is allowed.
Image
No split is allowed.
Text
Text includes anything consisting of printable characters and (optionally) formatting information. Hence it includes the content of numeric fields and of date, time, and date-time fields as well as text fields. Editable fields may take on a different appearance temporarily while they have the focus. For example, a date field may appear as a calendar widget with clickable dates. Layout is not concerned with this temporary appearance. Layout deals only with the non-focus appearance, which is also the appearance in non-interactive contexts such as when the form is printed on paper. Variable text (i.e. text residing in the Data DOM) is splittable below any line, at the position of the lowest descender from the line. In the figure at right, the dashed lines represent possible split points between lines. Note: Text within rotated containers cannot be split.
To be or not to be; that is the question. Whether 'tis nobler in the mind to bear the slings and arrows of outrageous fortune, or take up arms against a sea of troubles
Split lines within text
Widget
Widgets include buttons, check boxes, radio buttons, choice lists, and signature widgets. Widgets may take on a different appearance temporarily while they have the focus. Layout is only concerned with the non-focus appearance, which is also the appearance in non-interactive contexts such as when a form is printed on paper. No split of the non-focus appearance of a widget is allowed. In addition to the above inherent constraints, an explicit constraint may be placed upon an individual subform restricting when it can split. A subform object possesses a keep property. The keep property has
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an intact sub-property which controls splitting. This can have any of three settings. none means that the layout processor is free to split the subform wherever it can. contentArea means that the layout processor is not allowed split the subform. Instead the subform is placed in a single contentArea. pageArea means that the layout processor may split the subform but not across pages. Note that the default value for the intact property varies depending upon context. If the subform is a row in a table (Tables on page 286), the default is contentArea. This is also the default when the subform's container's layout strategy is positioned. Otherwise the default is none. When the layout processor encounters a keep-intact constraint for the current subform it simply treats the subform as unsplittable. The current subform's container is prevented from splitting anywhere within the layout extent of the current subform. For example, the following template declares a subform that is to be kept intact.
Example 8.5
<template > <subform name="root" layout="tb" > <pageSet > <pageArea > <contentArea name="A" /> <contentArea name="B" /> </pageArea> </pageSet> <subform name="C" /> <subform name="D" > <keep intact="contentArea" /> </subform> </subform> </template>
Assume that the subform D contains a field holding a multiline block of text and that the layout processor is attempting to place it into the remaining portion of contentArea A, but it is too tall to fit. Without the intact property the layout processor would have split D in between lines and placed the top part into contentArea A and the remainder into contentArea B. Instead it treats subform D as unsplittable and places the whole subform into contentArea B, as shown at right.
D C
To be or not to be, that is the question. Whether 'tis nobler in the mind to bear the
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Content B
Content C
contentArea A
top margin
Image E
Image F
To be or not to be, that is the question. Whether 'tis nobler in the mind to bear the
split
split
bottom margin
Subform D
When the object to be split contains other objects, the layout processor finds the most efficient (lowest) split location that is Splitting a container acceptable to all of the contained objects. In other words it finds the optimum consensus. The optimum consensus may be found by the following procedure (written as pseudocode):
Start with the current split location set to the desired split location. While any object in the container cannot split at the current split location, do the following: Set the current split location to the lowest permissible split location for that object that is above the current split location
Thus the split location creeps upward until a location is found that is acceptable to all the contained objects. This location may be right at the top of the container (Y offset of zero) in which case the object can not split. Split consensus is employed when splitting subforms, areas, and exclusion groups.
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Whether 'tis nobler in the mind to bear the border break = open
Pagination Strategies
Printers come in two types, simplex (printing on one side of the paper only) and duplex (printing on both sides). Furthermore, when displayed on a monitor a form may be displayed as a series of individual pages (simplex) or as a series of side-by-side pairs of pages (duplex). Often the form creator can not control whether the form is presented in simplex or duplex. Since version 2.5 XFA has provided means for the form to adapt to simplex or duplex presentation as required through the specification of a pagination strategy. The pagination strategy is controlled by the relation property of a pageSet object. This property takes three values representing the three different strategies. When the value of relation is orderedOccurrence the original pre-XFA 2.5 strategy is selected. In this ordered pagination strategy the current content node starts at the root of the content subtree of the Form
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DOM and traverses the content subtree depth-first and left-to-right (oldest-to-newest). This order is also known as document order, although not all DOMs are ever expressed as XML documents. When using this pagination strategy the same number and sequence of surfaces is printed regardless of printer type. For backwards compatability this is the default pagination strategy. When the value of relation is either simplexPaginated or duplexPaginated a different approach is taken. When the layout processor chooses the next pageArea object it takes into account a number of qualifications specified for the pageArea. For example the pageArea can be limited to being a front surface or back surface, or to being at a certain position within a contiguous series of pages from the same enclosing pageSet. (This approach duplicates the pagination logic and much of the syntax of XSL-FO [XSL-FO].) The logic for simplexPaginated and duplexPaginated is very similar and they are both explained in Qualified pagination strategies on page 266. When the current pageArea is full, the layout processor moves on to the next pageArea object in accordance with the selected pagination strategy. By default, when it has filled the last pageArea object, it stops and no more content is laid out. However, it is possible for individual pageArea objects, and the pageSet object, to be copied multiple times into the Layout DOM. This is controlled by the maximum occurrence property of the pageArea or pageSet. It is also possible to make subform elements and subformSet elements sensitive to evenness or oddness of the page count using the break property. This is independent of the pagination strategy.
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Caution: The occur properties are ignored when the pagination strategy is either simplexPaginated or duplexPaginated. In the simplest case every page of the form is identical, except for the variable data within fields. In this case the occur property of the pageArea element can simply be set to the required number of pages. As with subforms the same value is supplied for the min and initial attributes, and the max attribute defaults to the same value. For example in the following template fragment the subform has a breakBefore property which causes each instance of the subform to be laid out on a new page. The breakBefore property is discussed in Break Conditions on page 237.
Example 8.6
<subform ...> <pageSet relation="orderedOccurrence" ...> <pageArea> <occur min="5" initial="5"/> </pageArea> </pageSet> <subform ...> <occur min="5" initial="5"/> <breakBefore targetType="pageArea"/> <draw .../> <field .../> </subform> </subform>
A sequence of pages can also repeat. This is accomplished using the occur property of the pageSet element. For example, in the following template fragment each of subform A and B is given a page (and corresponding pageArea object) by itself. The pattern of alternating pages is repeated five times, for a total of ten pages.
Example 8.7
<subform ...> <pageSet relation="orderedOccurrence" ...> <occur min="5" initial="5"/> <pageArea ...> <occur min="1" max="1"/> </pageArea> <pageArea ...> <occur min="1" max="1"/> </pageArea> </pageSet> <subform ...> <occur min="5" initial="5"/> <subform name="A"...> <breakBefore targetType="pageArea"/> <draw .../> <field .../> </subform> <subform name="B"...> <breakBefore targetType="pageArea"/> <draw .../> <field .../> </subform> </subform>
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</subform>
It is legal to set the occurrence count for a page or set of pages higher than the number of pages used by subforms in the template. When the layout processor runs out of content, it continues appending blank pages as necessary to fulfill the minimum occurrence requirements. Note that the default occurrence behavior of pageSet and pageArea objects differs from the default behavior of subform objects. When no maximum or minimum occurrence is supplied for a subform the subform limits itself to exactly one instance. However when no maximum or minimum occurrence is supplied for a pageArea or pageSet object, the pageArea or pageSet object allows itself to replicate without limit. In this case the layout processor stops adding new pages or sequences of pages only when it runs out of subforms to lay down. A pure boilerplate pageArea is a pageArea element that does not contain any contentArea elements. A pure boilerplate pageArea must not have a maximum occurrence limit of -1 (whether by defaulting or supplied explicitly). This is because, should the layout processor find its way into such a pageArea, it logically should execute an infinite loop emitting pages. This is anti-social behavior and templates are forbidden to do this. For the same reason, a pageSet element that contains only pure boilerplate pageArea elements must not have a value of -1 for its maximum occurrence property. However it is anticipated that layout processors will encounter some templates that are not conforming in one of these ways. It is recommended that in such a case the layout processor emit a warning and proceed as though the value of the offending max attribute was 1. In subsequent processing this could lead to the layout processor using up all allowed occurrences and quitting prematurely, which is annoying but safe behavior. One might ask why contentArea objects do not have occur properties. There would be no point, because each instance of the contentArea would occupy the same position upon the page. By contrast each instance of a pageArea represents a unique display surface and each instance of a pageSet represents a unique set of display surfaces.
Example 8.8
<pageSet relation="orderedOccurrence" name="A"> <occur max="-1"/> <pageArea name="B"> <occur max="1"/> <contentArea name="C" /> <contentArea name="D" /> </pageArea> <pageArea name="E"> <occur max="2"/> <contentArea name="F" /> </pageArea> </pageSet>
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By default the layout processor starts putting content into the first contentArea (C) on the first pageArea (B) if the first pageSet (A). At this point the Layout DOM contains:
[root] [pageSet (A)] [pageArea (B)] [contentArea (C)]
When C is full the layout processor moves to contentArea D, adding a corresponding node to the Layout DOM. When D is full it ascends to pageArea B and consults its maximum occurrence property. This is set to 1, so it can't create a sibling for pageArea. Instead it ascends once more and finds the next pageArea, E. It adds a node to the Layout DOM corresponding to E and descends into contentArea F. It adds a node corresponding to contentArea F and begins pouring content into it. At this point the Layout DOM contains:
[root] [pageSet (A)] [pageArea (B)] [contentArea (C)] content [contentArea (D)] content [pageArea (E)] [contentArea (F)] content
When F is full, the layout processor ascends to E and finds that its maximum occurrence limit has not yet been exhausted, so it adds another instance of it to the Layout DOM as a sibling of the previous instance. Then it descends once again to contentArea F, adding another instance of it to the Layout DOM. At this point the Layout DOM contains:
[root] [pageSet (A) relation="orderedOccurrence"] [pageArea (B)] [contentArea (C)] [contentArea (D)] [pageArea (E[0])] [contentArea (F)] [pageArea (E[1])] [contentArea (F)]
When F fills up the layout processor once again ascends to E. This time the maximum occurrence limit has been exhausted, so it ascends once again. There are no more pageArea objects to descend into, so it considers adding another instance of pageSet A. This has a maximum occurrence limit of -1. A maximum occurrence property of -1 is interpreted by the layout processor as meaning no limit. Hence it may duplicate the pageSet without limit. It adds an instance of pageSet A to the Layout DOM and descends as before. At this point the Layout DOM contains:
[root] [pageSet (A[0]) relation="orderedOccurrence"] [pageArea (B)] [contentArea (C)] content [contentArea (D)] content [pageArea (E[0])] [contentArea (F)]
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content [pageArea (E[1])] [contentArea (F)] content [pageSet (A[1])] [pageArea (B)] [contentArea (C)] content
Assuming that the last content is used up without filling this latest contentArea (which could be called A[1].B.C), the resulting document would consist of four display surfaces. (If rendered and printed single-sided at this point it would come out of the printer as four sheets of paper, with each sheet having printing on one side.) In the example above only the amount of data limits the number of surfaces. However had the maximum occurrence limit for pageSet A been a positive number, the layout processor could have exhausted it. When this occurs the layout processor stops adding content, and it is recommended to issue a warning message. It does not traverse to another pageSet, even if there is one. The template syntax allows other pageSet objects to exist but they may not be used for this purpose. The maximum occurrence limit on the pageSet is likely to be used as a safety-valve to prevent the accidental generation of huge print runs. However it may also be used to intentionally extract just the first portion of a document. For that reason, when the limit is reached, the layout processor should preserve the Layout DOM so that the content laid out to that point can be rendered. The value of the maximum occurrence limit for a pageSet or pageArea must be either -1, which signifies no limit, or a positive (i.e. one or greater) decimal integer. If not supplied it defaults to -1. Note that subforms may also have maximum occurrence values, but those are used only in the data binding (merge) process; they have no effect on the layout processor. See the Basic Data Binding to Produce the XFA Form DOM on page 159 for more information about minimum and maximum occurrence values for subforms.
Error Condition: Exhaustion of pageArea Occurrences
If all available pageSet and pageArea objects have maximum occurrence properties that are not equal to -1, there is a limit to how many pageArea objects can be included in the layout. When the last pageArea within this limit has been laid out, the layout processor stops processing. If there is more content that has not yet been laid out, the additional content is discarded. However the layout processor has no way of knowing whether the situation arose deliberately or as a result of an accidental mismatch between the template and the user data. Hence the layout processor should issue a warning but retain the pages laid out up to that point in the Layout DOM for rendering.
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Example 8.9
<pageSet relation="orderedOccurrence" name="A"> <occur min="2"/> <pageArea name="B"> <occur min ="0"/> <contentArea name="C" /> <contentArea name="D" /> </pageArea> <pageArea name="E"> <occur min="2"/> <contentArea name="F" /> </pageArea> </pageSet>
Assume that there is no breakBefore on either the root subform or its first child subform. At startup the layout processor descends from the first pageSet of the root subform into its first pageArea child, and thence into its first contentArea child. However the minimum occurrence property of pageSet A forces the layout processor to include two instances of A into the Layout DOM. Furthermore the minimum occurrence limit of pageArea E forces the layout processor to include two instances of E under each instance of pageSet A. The result is:
[root] [pageSet (A[0]) relation="orderedOccurrence"] [pageArea (B)] [contentArea (C)] [pageArea (E[0])] [pageArea (E[1])] [pageSet (A[1])] [pageArea (E[0])] [pageArea (E[1])]
Hence, the document already includes five pageArea objects, even though it does not yet have any content. (If rendered and printed single-sided at this point it would come out of the printer as five blank sheets of paper.) As content is poured into pre-existing contentArea objects, and more contentArea objects are added, the pageArea objects are gradually consumed. No more pageArea or pageSet objects are added until the existing ones are used up. At that point the Layout DOM contains:
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[root] [pageSet (A[0]) relation="orderedOccurrence"] [pageArea (B)] [contentArea (C)] content [contentArea (D)] content [pageArea (E[0])] [contentArea (F)] content [pageArea (E[1])] [contentArea (F)] content [pageSet (A[1]) relation="orderedOccurrence"] [pageArea (B)] [contentArea (C)] content [contentArea (D)] content [pageArea (E[0])] [contentArea (F)] content [pageArea (E[1])] [contentArea (F)] content
The layout processor is data-driven; it lays down pageArea objects in order to use the contentArea objects on them. However it is possible for a pageArea to contain boilerplate but no contentArea. The minimum occurrence limit makes it possible to force the layout processor to lay down an instance of such a page, despite its lack of a contentArea. The value of a minimum occurrence limit for a pageSet or pageArea must be a non-negative (i.e. zero or larger) decimal integer. Minimum and maximum occurrence limits may be combined. If the same pageSet or pageArea has both minimum and maximum occurrence limits the maximum must be either -1 or larger than the minimum. Note that subforms may also have minimum occurrence values, but those are used only in the data binding (merge) process; they have no effect on the layout processor. See the Basic Data Binding to Produce the XFA Form DOM on page 159 for more information about minimum and maximum occurrence values for subforms.
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in the World-Wide Web Consortiums Extensible Stylesheet Language [XSL-FO]. To make it easier for readers familiar with XSL-FO the following discussion explicitly shows the parallels. All of these page qualifications are ignored if the relation property of the parent pageSet object is orderedOccurrence.
first - The page must be the first in the set. last - The page must be the last in the set. rest - The page must not be the first or last in the set but can be in any other position. only - The page must be the only one in the set. any - No qualification is asserted. This is the default.
This property corresponds to the page-position property in XSL-FO. A pagePosition of first, last, or only inherently limits the pageArea to being used only once within the page set. By contrast a pagePosition of any or rest implies that the pageArea can be used any number of times within the pageSet. Because of these implied occurrence limits pageArea objects that use qualified pagination ignore their occur properties. Note: In order to support only and last the layout processor may have to redo the layout of the current page under some circumstances. For example, it cannot know that the page set will contain only one page until it encounters the break or end of processing that terminates the page set. Form authors using only and/or last should expect an increase in CPU overhead.
odd - The physical surface count must be odd-numbered (front surface). even - The physical surface count must be even-numbered (back surface). any - No qualification is asserted. This is the default.
This property approximates the odd-or-even property in XSL-FO. However in XSL-FO the controlling variable is not the physical surface count but the folio number. The XSL-FO folio number can be set by the stylesheet wherease the XFA physical surface count cannot be altered by the application. The physical surface count always starts at zero and increments by one for each surface printed or displayed. Also XSL-FO allows a value inherit which is not supported by XFA. Note: When the pagination strategy is simplexPaginated the page is always assumed to be the front surface of a sheet, hence always odd.
blank - The page was included merely to satisfy a break-to-even or break-to-odd requirement, not to hold any content. The break requirement is asserted by a subform or subformSet object. The break
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requirement could have been asserted using the breakBefore property, the breakAfter property, or the deprecated break property. However it may have been asserted, it specifies a targetType of either pageEven or pageOdd. This context corresponds to the assertion of a force-page-count property in XSL-FO.
notBlank - The page was included either to hold content or to satisfy a minimum occurrence requirement. any - No qualification is asserted. This is the default.
Note: A page may be included to hold content yet the content may not include anything visible to the eye. This qualification is based upon the context, not the content of the page.
page position - either first (before the first page is placed) or not-first (all remaining pages using the page set) odd or even - may be odd (front surface) or even (back surface)
When applying the simplexPaginated strategy the layout processor stays in the odd (front surface) state. When applying the duplexPaginated strategy the state is determined by the evenness or oddness of the physical surface count. During processing the layout processor may break from an even page to a page that asserts even, or from an even page to a page that asserts odd. When this happens, if the strategy is duplexPaginated, the layout processor emits an extra page which is blank. This page must be qualified as odd (if breaking to an even page), even (if breaking to an odd page), or any. It must also be qualified with a blankOrNotBlank setting of blank or any. As with all qualified pages it must be a child of the current pageSet. If during processing the layout processor cannot find a pageArea that is a child of the current pageSet and that matches its requirements a fatal error occurs. At the end of processing, when it has exhausted the Form DOM, the layout processor performs termination processing for the page set. If there is a pageArea that is specified as last the layout processor backtracks and tries to redo the layout of the current page using that pageArea. However it does not do this is the current page does not match, that is if it has a different number of content areas or is itself qualified as first or last. If the pageArea object does match and the content fits onto it then the resulting page replaces the current page. However if the pageArea objects dont match or the content does not fit onto the designated last page then the layout processor keeps the current page and in addition emits a blank instance of the designated last page. Similarly if a pageArea is specified as only and the current page is the only one in the page set, the layout processor tries to redo the layout of the current page using the designated only pageArea. If the content fits then the resulting page replaces the current page, otherwise the current page is retained.
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The following table illustrates the layout state for a 3-page run using a simplexPaginated strategy. surface 1 2 3 page position First Not first Not first odd or even Odd Odd Odd
The following table illustrates the layout state for the same 3-page run using a duplexPaginated strategy: surface 1 2 3 page position First Not first Not first odd or even Odd Even Odd
Subforms and subform sets may specify breaks that direct the layout to a different page set. When a change of page set occurs the current page set is terminated before layout transitions to the new page set. There is no limit to the number of times a pageSet using qualified pagination may be used. Its occur property (like the occur properties of its pageArea children) is ignored. Generally explicit breaks are permitted to go to any page or page set, however there is one restriction. If a pageArea has its blankOrNotBlank property set to blank, it is forbidden to break to that pageArea.
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Adhesion
Generally when using a flowing layout strategy the layout processor puts as much content as possible into each contentArea before moving on to the next contentArea, splitting layout objects where possible to pack them more efficiently into the contentArea. However sometimes the densest packing is not desired. For example, it may be desired to keep sequential layout objects together in the same contentArea, similar to widow and orphan control in word processors. The keep property of a subform has sub-properties which control exceptions to the default packing. Adhesion of the current subform to an adjacent subform is controlled by the next and previous sub-properties of the keep property. These sub-properties accept three values.
none means the subform does not adhere to the adjacent subform. This is the default. contentArea means the adjacent parts of the two subforms must be placed in the same content region. pageArea means the adjacent parts of the two subforms must be placed on the same page.
When the layout processor encounters a keep-next constraint for the current subform or a keep-previous constraint for the next subform, it holds off laying down the current subform until it reaches a contentArea big enough to hold both the bottom part of the current subform and the top part of the next subform. The next subform may have an adhesion constraint that similarly binds it to the next subform, and so on. If consecutive adhering subforms are not splittable then the layout processor holds off laying down all of them until they can be laid down together. The unused content region is left blank. The default value for next and previous is always none, regardless of context. Note that there is overlapping functionality. Two adjacent subforms adhere if the first one declares that it adheres to the next or if the second one declares that it adheres to the previous. It is also permissible for them both to declare that they adhere to each other. In all three cases the effect is the same. For example, the following template declares two subforms that each adhere to the next subform. The result is that three adjacent subforms adhere together.
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</subform> </template>
In this case all three of the subforms have been declared unsplittable using the intact property. The result is as shown at right. Because all three adhering subforms can not fit in the remaining region of contentArea A, they are placed together in contentArea B.
C A D
E The result would have been different if the subforms had been splittable. When an adhering subform is B splittable only the adhering edge and the first fragment of content (not including the border) adhere to the adjacent subform. However if the Adhesion of unsplittable subforms smallest permissible fragment does not fit in the available space then the layout processor holds off laying down both subforms. Consider what happens if the previous example is modified so that subform D is splittable.
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In this case subform C and the top part of D fit in contentArea A, while the remainder of D and subform E are placed in contentArea B, as shown at right. The adhesion requirements are still satisfied because C adheres to a piece of D and a piece of D adheres to E.
Note: Adhesion is restricted to adjacent subforms that are siblings in the Form DOM. If they do not share the same parent they do not adhere. The reason for this is that not being siblings in the Form DOM implies that they Adhesion of splittable subforms are not logically grouped. This rule is particularly useful in dynamic forms, as discussed in Adhesion in Dynamic Forms on page 315. For example, in the following template subform D does not adhere either to subform C or subform X because they are not siblings with D.
Adhesion is modified by the presence of a subform set. Subform sets have not been introduced yet. They are used with dynamic forms. The effect of a subform set upon adhesion is discussed Adhesion in Dynamic Forms on page 315.
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The words leader and trailer have slightly different meanings in the context of a break condition than they do in other contexts. The leader and trailer do not surround the content of the object. Rather they surround the break itself. For example, suppose a before break is specified and it includes a leader and a trailer as follows.
When it is ready to start processing subform D, the layout processor carries out the following steps: 1. Places the leader into the current layout region, which in this case is content area A. 2. Moves, if necessary, to a new layout region to satisfy the target specification and target type. In this case it moves to content area B. 3. Places the trailer into the new layout region, content area B. 4. Begins placing the content of the object into the new layout region, content area B. For comparison, suppose an after break is specified and it includes a leader and a trailer as follows.
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When it is about to finish processing subform D, the layout processor carries out the following steps: 1. Finishes placing the content of the object into the current layout region. Because of the before break this is content area B. 2. Places the leader into the current layout region, content area B. 3. Moves, if necessary, to a new layout region to satisy the target specification and target type. In this case it moves to content area C. 4. Places the trailer into the new layout region, content area C. 5. Procedes with the next object. Note that the trailer is placed even if there is no subsequent object to lay down. In the example this is the case, because D is the last displayable object inside the root subform W.
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other content of the subform. Bookend leaders and trailers are controlled by the bookend property of the flowing subform. For example, a template includes the following declarations.
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When flowing content into subform B, the layout processor starts by placing subform Leader at the top, then fields C, D, and E in that order, then subform Trailer at the end. The result is shown below at left.
subform Leader
subform Header
subform B field C
bottom of field D
bottom of subform B
field C field E
field D
subform Trailer
field E subform Trailer
top of field D
top of subform B
contentArea F
contentArea A
Bookend subforms
A subform with a bookend leader and/or trailer may be split across contentArea boundaries. As shown above at right, fields C, D, and E, plus subforms Leader and Trailer, taken together, are too tall to fit in contentArea A and overflow into contentArea F. The layout processor places the bookend header as the first layout object inside contentArea A and the bookend trailer as the last layout object inside contentArea F. The root subform may specify a bookend leader and/or trailer. These are incorporated at the beginning and/or end of the entire document.
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XFA Specification Chapter 8, Layout for Growable Objects Flowing Layout for Containers 278
Assume that the total height of fields C, D, and E is greater than the height of contentArea A. The layout processor places subform B into contentArea A, and starts placing the fields into subform B. While placing the fields into B it reserves space for Trailer. Field D overflows the available space. The layout processor splits field D, then it places the top of D and Trailer into subform B. It splits subform B at the bottom of Trailer, completing the first fragment of B. Then it begins to place the second fragment of subform B into contentArea F. Into this it places the bottom of D, all of E, and Trailer. The result is shown at right. In the example D could not split in the ideal location (exactly at the bottom of contentArea A), so its top fragment is a little shorter than it could have been. Subform Trailer is placed immediately after the top fragment of D, leaving a little space between Trailer and the bottom of contentArea A.
field E
top of field D
Note: The layout processor must reserve space in advance for the overflow trailer. This reservation of contentArea A contentArea F space sometimes forces an overflow to happen which would not have happened otherwise. In the Overflow leader and trailer subforms figure below, which is like the previous example but with subform Trailer taller and field D shorter, D would have fit into the available space in contentArea A if some of that space had not been reserved for the overflow trailer.
subform Leader bottom of field D field C top of subform B field E bottom of subform B
subform Trailer
top of field D
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When a field overflows the overflow leader and trailer is supplied by the field's containing subform, because a field does not have an overflow property. However when a subform overflows it may supply its own overflow leader and trailer. If a subform overflows and it specifies its own overflow leader then that overflow leader is used, otherwise it uses the inherited one. The overflow trailer behaves the same way. The layout processor respects maximum occurrence properties of leader and trailer subforms. Within a particular subform (in the example above subform B), the layout processor stops laying down leader or trailer subforms when the leader or trailer subform's maximum occurrence is exhausted. For example, suppose that the template contained the following declarations.
Example 8.17 Template with maximum occurrence properties on leader and trailer
<template> <subform name="W"> <pageSet > <pageArea > <contentArea name="A" /> <contentArea name="B" /> <contentArea name="C" /> <contentArea name="D" /> </pageArea> </pageSet> <subform name="E" layout="tb" > <overflow leader="#Leader_ID" trailer="#Trailer_ID"/> <field name="F"> </field> </subform> </subform> <proto > <subform name="Leader" id="Leader_ID"> <occur max="2"/> <draw > <text > </text> </draw> </subform> <subform name="Trailer" id="Trailer_ID"> <occur max="1"/> <draw > <text > </text> </draw> </subform> </proto> </template>
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Assume that field F is very tall compared to the contentArea objects. Subform E overflows from A and B, then from B and C, and finally from C to D. Subform Trailer's occurrences are used up after the first overflow, so it only appears at the bottom of contentArea A below the first fragment of E. Leader's occurrences are used up after the second overflow, so it appears at the top of contentArea B (Leader[0]) and at the top of contentArea C (Leader[1]). The result is shown at right. Often leader and trailer subforms are placed in the proto section of the template (rather than under the root subform) to prevent them from taking part in the merge process. Alternatively leader and trailer subforms may be made nameless or given a scope of none, either of which also prevent them from participating in the merge process. However if none of these things are done then the leader or trailer subform may also appear in the Form DOM bound to a node in the Data DOM. To accommodate this the layout processor maintains its own occurrence counts for leaders and trailers, separate from occurrence counts used by the merge process. On the other hand if the same subform is used both as a leader and a trailer, its occurrence limit applies to the total of its appearances as leader and as trailer.
Trailer[0]
Leader[1]
C contentArea D
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The figure at right shows the result of laying out this form. Assume that the merge results in field F holding a large amount of text. Subform X is used as an overflow trailer once, exhausting its maximum occurrence limit. The layout processor moves on to the next object in the list, which is subform Y again. After subform Y has been used the layout processor goes on to the next overflow trailer subform, which is subform X again. However X's limit is still exhausted, so the layout processor passes over it. The end of the list has been reached so the layout processor stops laying down overflow trailers.
subform X
subform Y
contentArea D
If a leader or trailer target is not valid (for example if it does not exist or is not an appropriate object), the layout processor issues a warning message and continues processing without laying down the leader or trailer.
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Assuming the fields F and H each contain moderate amounts of text, the layout processor puts the first fragment of field F into contentArea A, laying down one instance of subform X as an overflow trailer at the bottom. This exhausts the maximum occurrence limit for subform X. The layout processor finished processing field F by placing the second fragment of it into contentArea B. At this point it encounters subform G. At this point, because G declares an overflow trailer for itself, the layout processor starts a separate count of instances of subform X. It is able to place an instance of subform X at the bottom of contentArea B as an overflow trailer because the new count of instances has not yet reached the limit. Upon finishing with subform G the layout processor returns to subform E in order to process field I. Subform G's occurrence count for subform X is still set to one, so it does not lay down an overflow trailer when field I overflows contentArea C. The result is shown at right.
subform X
subform X
Inheritance need not be direct. Objects other than contentArea D subforms are transparent to inheritance of overflow leaders and trailers. For example, a subform A contains an area B which in turn contains a subform C. If subform A Effect of inherited occurrence counts asserts an overflow leader but subform C does not, subform C inherits the overflow leader from A. In addition, inheritance can chain through any number of intermediate subforms that do not assert the leader or trailer. However the chain of inheritance can be stopped at a particular subform by asserting an overflow leader or trailer with the name (the empty string). A subform may also inherit an overflow leader or trailer once it has exhausted the occurrence limit(s) for its own overflow leader or trailer subform(s). When this happens the layout processor resumes spending inherited leader or trailer subform(s). When these inherited occurrences are exhausted the layout processor moves up the chain of inheritance and resumes spending occurrences at the next higher level, and so on. Only when all inheritable overflow leaders or trailers have been exhausted does it stop inserting overflow leaders or trailers.
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After merging field F holds a large amount of text. The result is shown at right. The bookend header named Title, containing Wheel Invented, has been laid down before the first fragment of F. The bookend trailer named Source, containing oldnews.com, has been laid down after the last fragment of F. In addition the overflow trailer Y (continued in next column) and the overflow leader X (continued from previous column) have been inserted wherever F has flowed across containers.
Wheel Invented
(continued in next column) (continued from previous column) last fragment of field F - oldnews.com
contentArea D
Tables
The layout process can automatically arrange layout objects into aligned rows and columns. This is accomplished by marking subforms in the template as table or row subforms using the layout property. A table subform represents an entire table and contains everything in the table. A row subform represents one row of a table and contains everything in the row. A row subform can only exist inside a table subform, although it may not be a direct child of a table subform (for example it may be a child of a subform set which is itself a child of a table subform). The table subform may optionally supply a list of column widths. If the list of column widths is supplied, each width must be either a measurement or -1. A column width of -1 tells the layout processor to fit the column to the natural width of the widest object in the column. If no list of column widths is supplied, all column widths default to -1. Similarly the widths for any columns that are not present in the list (that is, beyond the length of the list) default to -1.
In the above example the first column is set to one inch wide, the second is unspecified, the third column is set to 25 millimeters wide, and the fourth is unspecified. As usual in layout when a fixed size is allotted for an object, the visible representation of the object may extend beyond the allotted region. The layout processor regards each layout object inside a row subform as a cell in the table. First it lays out the cells in each row in order from left to right with their natural sizes. Then it adjusts the cell sizes to align the table. For each row it expands the cells vertically to the height of the tallest cell in the row. This results in each row being vertically aligned. Next it lays out the rows sequentially from top to bottom. Then the layout processor aligns the columns. It expands the cells in each column horizontally to the designated width, or if the width is not specified to the width of the widest cell in the column. If a row does not have as many cells as other rows then it leaves an empty region on the right of that row.
The following figure shows the above example before and after table alignment.
C B P K M Q D
height of D
C P
height of J
1 inch width of B
25 mm width of M
The figure at right shows this example before and after table alignment. The first column contains A and the left side of J. The second column contains the left side of B and the right side of J. The third column contains the right side of B and all of K. The fourth column contains all of C and the left side of L. The fifth column contains the all of C and the right side of L. M does not appear because it is preceded by a cell (L) with a colSpan of -1. In this example all the columns have constrained widths. It is possible for a table to contain cells spanning columns with unconstrained widths. As long as at least one cell in each unconstrained column does not span multiple columns the table is well-defined. However if any given unconstrained column contains only cells that span multiple columns the table is not well-defined and the resulting layout is up to the implementation. Most tables have one title cell per column so this situation does not usually arise. Note that, in contrast to cells spanning columns, XFA does not provide support for cells spanning more than one row. The examples above show uniquely-named cells and rows but neither cells nor rows have to be uniquely named. It is also normal and expected for cells and rows to be subforms or subform sets that have
C B P K M Q D
height of D
height of J
25 mm 0.6 in
Table with cells spanning multiple columns, before and after alignment
multiple and/or variable (dynamic) occurrences. The layout algorithm as described here is only affected by the presence of objects in the Form DOM, not by their names or how they got there. The examples above do not show margins or borders for the table or row subforms but it is normal and expected for them to be used. In addition the cell objects may have their own margins and/or borders. Typically all the direct children of a table subform are row subforms. However a table subform may have direct children consisting of any mixture of row subforms and ordinary subforms or other layout objects (although row subforms must not appear as descendents at a deeper level). The non-row child is laid out in the same place where a row would appear, but it and its contents are not adjusted for alignment in height or width. A table subform may descend from a table subform, causing tables to be nested. Tables may nest to any level. Tables can be freely combined with leaders and/or trailers. A table subform may employ a row subform as a leader or trailer, but it may also employ an ordinary subform.
Dynamic Forms
This chapter explains how XFA processing applications support binding and layout in dynamic forms. A dynamic forms differ from static forms in their ability to dynamically add containers and rearrange layout depending on the data being entered. Basic Data Binding to Produce the XFA Form DOM on page 159 describes data binding for static forms and Basic Layout on page 46 describes layout for static forms.
291
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Membership List
John Betty Brown White
The membership list example is highly simplified compared to forms used in business. Consider the requirements for a dynamic purchase order form. This form must grow to as many detail lines (purchased items) as required by the data. In addition, there must be fields holding the subtotal, taxes, and the grand total, which must move down the page as the list of detail lines grows. Also, there must be a subform containing delivery instructions which must only be included if there are delivery instructions in the data. The following figure shows the result of merging the template with typical data.
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AnyCo
Date Requisition Number Vendor Code 1001 Vendor A1 Business Products 234 Second St. Anytown, ST USA 12345-6789 Item 123A 333C 777X 633B Qty 10 5 10 2 Description Mouse Pads Phone Message Pads Desk Calendars Desk Trays
Ship To Any 123 Any Any Company Inc. Any Ave. Town Country Unit Price Total Price 1.75 0.50 5.50 6.60 Subtotal Tax 7.25% Total 17.50 2.50 55.00 13.20 88.20 6.39 94.59
Units EA EA EA EA
Delivery Instructions Deliver these goods before the end of the fiscal year
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Example 9.1
<template > <subform name="Members"> <pageSet ></pageSet> <field name="Date" > </field> <subform name="Member"> <occur min="1" max="20"/> <field name="First" > </field> <field name="Last" > </field> </subform> </subform> </template>
In this example the minimum number of detail lines (member's names) that will be included when merging with data is one, from the min attribute. The maximum is twenty, from the max attribute. Note that when any of the attributes is omitted from the occur element, the value of the corresponding property defaults to 1. In the absence of an occur sub-element all of its properties default to 1. Hence the default behavior is for a subform to be incorporated exactly once into the Form DOM whether or not there is data, that is, to behave as a static subform. In the membership list example the minimum occurrence for the Detail subform defaults to 1 and the maximum is 20. The minimum of 1 means that the subform must be copied at least once into the Form DOM, even if there is none of the data matches it. The maximum of 20 means that it can be copied at most twenty times into the Form DOM. If the data file contained a twenty-first Member data group, it would if possible bind to some other subform. In this case there would be no other subform for it to bind to, so it would simply be ignored. Normally, for the template to be valid, the maximum occurrence value must be an integer greater than or equal to the minimum occurrence value. However a value of -1 for the maximum occurrence is special. It means that the number of occurrences is unlimited. When the maximum occurrence is -1 the minimum occurrence can have any value greater than or equal to zero. A maximum occurrence of -1 is very commonly used for dynamic subforms. When the form is to be displayed on a graphics display the unlimited scrolling length of the virtual page suits the unlimited length of the sequence of subforms. However when printed to paper the sequence of subforms must be broken up into properly paginated units. This is performed downstream by the layout process, as described in Layout for Dynamic Forms on page 315 and has no effect on data binding.
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Note that the minimum occurrence must be an integer greater than or equal to zero. In addition, it must be less than or equal to the maximum occurrence value unless the maximum occurrence value is -1. If either of these conditions is violated the template is invalid. When a subform has a variable number of occurrences, the data binding process starts by creating the specified minimum number of copies of the subform in the Form DOM. Then it seeks matching data objects for each of these in turn. If it finds matches for all of them, and there is still another potential match, it adds another copy and binds this to the next match. It continues adding more copies and binding them as long as the total number of copies is less than the maximum and there is at least one more match. In the example, it starts with one copy ($form.Members.Member[0]), because this is the minimum, and binds it to the first Member data group ($data.Members.Member[0]). Proceeding in template document order, it descends into the subform and the data group and binds the fields to the data values. Returning to the $form.Members level, it finds that it is allowed to add another copy of the same subform and also there is a match for it, so it adds $form.Members.Member[1], binding it to $data.Member.Members[1], then descends into these and binds fields to data values. After this the data binding process finds that, although it is allowed to add more copies of the same subform, there would be no matches for the copies. Hence it stops adding copies of $template.Members.Member and returns to the next higher level in the template ($template.Members) where it looks for the next child of Members to copy into the Form DOM but there isn't one, so it is finished. The effect is the same as if the Members subform was declared twice in the template just as many times as the data requires and each Members subform along with its contents was processed in document order. The following figure shows the resulting relationship between the DOMs.
Template DOM
Members
Form DOM
Members
Data DOM
Members
Date
Last Brown
First John
Last Brown
Member[1]
Member[1]
First Betty
Last White
First Betty
Last White
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The template for the dynamic purchase order on page 293, omitting decorative elements, is as follows.
Example 9.2
<template > <subform name="PO"> <pageSet ></pageSet> <field name="PO_Date" > </field> <field name="ReqNo" > </field> <field name="Vendor_Code" > </field> <field name="Vendor_Name" > </field> <field name="VendAddr1" > </field> <field name="VendAddr2" > </field> <field name="VendAddr3" > </field> <subform name="Detail"> <occur max="-1"/> <field name="Item"> </field> <field name="Quantity"> </field> <field name="Units"> </field> <field name="Unit_Price"> </field> <field name="Total_Price"> </field> </subform> <field name="Sub_Total"> </field> <field name="Tax"> </field> <field name="Total"> </field> <subform name="Delivery"> <occur min="0"/> <field name="Del_Instrctn"> </field> </subform> </subform> </template>
The Detail subform has no maximum occurrences and defaults to a minimum of one. This is typical for a subform corresponding to one in a list of records. The Delivery subform has no minimum occurrences and defaults to a maximum of one. This is typical for a record which is optional. The DOM relationships for this example are not shown here because the drawing would not fit in the space available. Note that fields do not have occur properties, hence can not automatically repeat. It is common to wrap a field in a subform simply to provide a way to associate an occur property indirectly with the field. In such cases it may be convenient to leave the subform nameless so it does not alter the SOM expression used to refer to the field in scripts. Alternatively, setting its scope property to none causes it to appear in SOM expressions but to be transparent to the data binding process so it has no effect on the data hierarchy.
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Example 9.3
<template> <subform name="jointFiling"> <subform name="spouse"> <occur initial="2"/> <subform name="employer"> <occur initial="3"/> <field name="empName">...</field> </subform> </subform> </subform> </template>
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The following figure shows the Form and Data DOMs that result when the above template is processed through the data binding process without data. The Template DOM has been omitted to save space.
Form DOM
jointFiling
Data DOM
jointFiling
spouse[0]
spouse[0]
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Example 9.4
<template> <subform name="jointFiling"> <subform name="spouse"> <occur max="2"/> <subform name="employer"> <occur max="3"/> <field name="empName">...</field> </subform> </subform> </subform> </template>
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Given a flat data document with eight empName elements, the resulting Form and Data DOMs, before renormalization, are shown in the following figure. Data values after the first six are left unbound because there are no unbound empName fields left for them to bind with.
Form DOM
jointFiling
Data DOM
jointFiling
spouse[0] empName[0] FraudCo employer[0] empName FraudCo employer[1] empName Scrooge PLC employer[2] empName Smash! Shipping spouse[1] empName[2] Smash! Shipping empName[3] FlyByNightCo empName[4] Scams Unlimited empName[5] Incompetent Inc. empName[6] Shaky Bank empName[7] Bozo Labs empName Incompetent Inc. empName[1] Scrooge PLC
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where there were no siblings copied from it before. If the same subform or subform set is subsequently used as a prototype somewhere else in the Form DOM the same starting number of siblings is created there too. For example, the following template fragment has a higher-level subform (spouse) with a minimum occurrence of 2 and a lower-level subform (employer) with a minimum occurrence of 3.
Example 9.5
<template> <subform name="jointFiling"> <subform name="spouse"> <occur min="2"/> <subform name="employer"> <occur min="3"/> <field name="empName">...</field> </subform> </subform> </subform> </template>
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Given a data document with a single data value named empName, the resulting Form DOM is shown in the following figure.
Form DOM
jointFiling
Data DOM
jointFiling
spouse[0]
employer[0] empName AnyCo employer[1] empName employer[2] empName spouse[1] empName[0] AnyCo
Blank Form
When a dynamic subforms or subform sets is merged with data, the data determines (at least partly) the number of times the subform or subform set is copied into the Form DOM. But what is to be done when there is no data, that is during an empty merge? A separate attribute (initial) is defined which controls
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how many copies of the subform or subform set are incorporated into the Form DOM during an empty merge. Generally initial will be equal to 1 or to the value of min or max. It does not make much sense to set initial to a value larger than max but it is not forbidden to do so. In fact initial is always used during an empty merge, even for static subforms and subform sets, so one could perversely set min and max to the same value but initial to some other value. Doing so is not recommended. The garden club diagram on page 292 shows the membership list as printed after merging with data. Compare this to the figure at right, which shows the same dynamic form after an empty merge. The template was defined in Example 9.1. For convenience it is repeated below.
<template > <subform name="Members"> <field name="Date" > </field> <subform name="Member"> <occur min="1" max="20"/> <field name="First" > </field> <field name="Last" > </field> </subform> </subform> </template>
Membership List
Since no value was supplied for initial, it defaulted to one. Hence the data binding process placed a single copy of the Member subform into the Form DOM. The resulting relationship between the DOMs is shown in the following figure.
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Template DOM
Members
Form DOM
Members
Date
Date
Member occur.initial = 3
Member[0]
First Last
Relationship between the DOMs of the membership form after an empty merge
Greedy Matching
Once the data binding process has introduced a subform into the Form DOM, and the number of occurrences is variable, the data binding process tries to match the full permitted number of siblings to the data. This is referred to as greedy matching. But some of the matches may be indirect matches. These indirect matches sometimes lead to non-intuitive results. For example, consider the following template fragment from a passport application.
Example 9.7
<template> <subform name="application"> <subform name="sponsor"> <occur max="7"/> <!-- up to seven sponsors --> <field name="last"> </field> <!-- sponsor's last name --> </subform> <field name="last"> </field> <!-- applicant's last name --> </subform> </template>
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Example 9.8
Template DOM
application
Form DOM
application
Data DOM
application
last
last
last
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Example 9.9
<template> <subform name="application"> <subform name="sponsor"> <occur max="7"/> <!-- up to seven sponsors --> <bind match="dataRef" ref="sponsor"/> <field name="last"> </field> <!-- sponsor's last name --> </subform> <field name="last"> </field> <!-- applicant's last name --> </subform> </template>
The result using this template fragment and the same data is shown in the following figure. This is the desired result.
Template DOM
application
Form DOM
application
Data DOM
application
last Abbot
sponsor
sponsor
sponsor
last
last Costello
last
Globals
A field or exclusion group can bind to global data, as described in Globals on page 218. However globals play a passive role in data binding. That is, the binding process does not drag in a subform into the Form DOM just because the subform contains a field or exclusion group that matches to a global. However once a subform has been dragged into the Form DOM, any field or exclusion group within that subform that does not match non-global data may fall back to binding with global data.
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bound to some other node then the declaring subform, field, or exclusion group is not dragged into the Form DOM. One way of looking at it is that the referenced data is treated as ordinary non-global data as long as it has not yet been bound, but once bound it is treated like global data.
Subform Set
An individual dynamic subform can be omitted or included in response to the presence or absence of data in the Data DOM. A subform set imposes additional constraints upon the inclusion or omission of the set of subforms and/or subform sets which it encloses. There are three types of subform sets, distinguished by the value of the relation attribute. The relation attribute can have any of the values choice, ordered, and unordered. A choice subform set encloses a set of mutually-exclusive subforms and/or subform sets. Even if the Data DOM contains matches for more than one of the members of the set, only one will be copied into the Form DOM. The one chosen is the first matching one encountered in the Data DOM, when descending it in data order, that is, width-first and oldest to newest (left to right). If there is no match none of the members are included, leaving the subform set node in the Form DOM without any children. An unordered subform set encloses subforms and/or subform sets that have no special ordering in the template. The whole set is copied into the Form DOM, however the ones (if any) that match data groups are copied first, in data order. The rest are copied in template order. An ordered subform set encloses subforms and/or subform sets that have a special ordering in the template. The whole set is copied into the Form DOM in template order, and then matching data nodes (if any) are bound to them. An ordered subform set is functionally equivalent to a subform with no name. Subform sets have initial, min, and max occurrence attributes just like the subforms that belong to the set. During an empty merge the initial attribute of the subform set determines how many copies of it are added to the Form DOM, and then the initial attributes of the subforms determine how many copies of each are added to the Form DOM under each copy of the subform set, except for choice subform sets. When a choice subform set is added to the Form DOM only the first of its subforms is copied to the Form DOM regardless of the occurrence attributes of the rest. For example, the following shows a portion of a template for a pizza order. There is a separate subform for each type of pizza topping because each type has different options. Pepperoni can be mild or hot, green peppers can be sliced or chopped, and olives can be green or black. The pizza toppings are contained by an ordered subform set.
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The following figure shows part of a Template DOM and the corresponding part of the Form DOM after an empty merge of the ordered subform set. For clarity the fields within the subforms are omitted from the drawing.
Template DOM
pizza topping relation = "ordered"
Form DOM
pizza topping relation = "ordered"
pepperoni
pepperoni
greenPeppers
olives occur.initial=0
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The following figure shows the result of an empty merge using this subform set. Only the pepperoni child is used and the other child subforms are ignored.
Template DOM
pizza
Form DOM
pizza
pepperoni
pepperoni
olives occur.initial=0
Example 9.12 Subform set for pizza topping with minimum occurrence limits
<subformSet name="topping" relation="unordered"> <subform name="pepperoni"> <occur min="0"> </subform> <subform name="greenPeppers"> <occur min="2"> </subform> <subform name="olives"> </subform> </subformSet>
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The following figure shows a the result of a non-empty merge to this fragment, leaving out fields and the data values to which they match. The toppings subformSet is dragged into the Form DOM by its pepperoni child, which matches a data group. Then, their minimum occurrence attributes force the inclusion of greenPeppers and olives subforms even though they do not match any data. Note that the olives subform merely defaults to a minimum occurrence of 1.
Template DOM
pizza
Form DOM
pizza
Data DOM
pizza
pepperoni
pepperoni
greenPeppers
greenPeppers
olives
olives
Example 9.13 Subform set for pizza topping with maximum occurrence limits
<subformSet name="topping" relation="unordered"> <subform name="pepperoni"> <occur max="2"> </subform> <subform name="greenPeppers"> <occur max="1"> </subform> <subform name="olives"> </subform> </subformSet>
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The following figure shows a non-empty merge to this fragment, in which the maximum occurrence attributes limit the number of pepperoni and olive subforms even while some data remains unmatched. Note that the olives subform merely defaults to a maximum occurrence of 1.
T
Template DOM
pizza
Form DOM
pizza
Data DOM
pizza
pepperoni
pepperoni
greenPeppers
greenPeppers
greenPeppers
olives
olives
olives
olives
Instance Manager
An instance manager is an object placed into the Form DOM by the data binding process for the use of scripts. One instance manager is placed in the Form DOM for each dynamic subform in the Form DOM. Using the instance manager the script can find out how many instances of the subform have been copied into the Form DOM and it can delete instances or insert more instances. When an instance is deleted, if the instance was bound to data, the binding is automatically broken. When a new instance is inserted the instance manager may invoke the data binding process to attempt to bind the new instance. Each instance manager is the peer of the subforms it manages. It is distinguished from them in two ways. First, it is not a subform object but an instance manager object. Second, its name is different. The name of the instance manager is an underscore (_) character followed by the name of the subforms it manages. For example, if a subform is called Member, the subform manager for that subform is called _Member. Caution: It is legal for XFA node names to start with underscore. This can lead to a name conflict if two sibling subforms have names that differ only by the presence of a leading underscore. It is the responsibility of the form creator to ensure that this does not happen.
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Instance managers have been omitted from drawings of the Form DOM elsewhere in this specification in order to reduce clutter. The following figure is another look at the result of merging data with the membership list template, as shown before in the figure DOMs resulting from dynamic membership list example on page 295, but this time showing the instance manager.
Template DOM
Members
Form DOM
Members
Data DOM
Members
Date
Date 01/01/04
Date 01/01/04
_Member instances = 2
Member[0]
Member[0]
Last Brown
First John
Last Brown
Member[1]
Member[1]
First Betty
Last White
First Betty
Last White
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<field name="Last" ...>...</field> </subform> <subform name="Member"> <field name="First" ...>...</field> <field name="Last" ...>...</field> </subform> </subform> </template>
This is fully equivalent to the earlier representation using three repetitions of the Member subform declaration. The Form DOM that results from the data binding operation has the exact same structure except that: 1. The Form DOM contains an instance manager named "_Member". 2. Multiple subforms in the Form DOM share the same prototype in the Template DOM, as shown in the following figure.
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Template DOM
Members
Form DOM
Members
Data DOM
Members
Date
Last Brown
First John
Last Brown
Member[1]
Member[1]
First Betty
Last White
First Betty
Last White
Member[2]
First Last
Example 9.16 Using a default max attribute with fixed occurrence numbers
<template ...> <subform name="Members"> <field name="Date" ...>...</field> <subform name="Member"> <occur min="3" initial="3"/> <field name="First" ...>...</field> <field name="Last" ...>...</field> </subform> </subform> </template>
Nested subforms and subform sets can have multiple occurrences at each level of nesting. The result is to compound the occurrences. For example, suppose a template has a subform Member which is set to occur
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three times, and Member contains a subform Name which is set to occur twice. This is equivalent to a template containing three subforms called Member, each of which contains two subforms called Name.
Adhesion can and does apply to multiple instances of a dynamic subform (that is, a subform with a variable number of occurrences dictated by the data). It is very common to combine adhesion with dynamic subforms. For example, the following template uses nested dynamic subforms to populate a form with repeated groups of five subforms.
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Assume the data contains twelve data items. After data binding the resulting Form DOM (not Layout DOM!) looks like this:
[subform (root)] [subform (outer[0])] [subform (inner[0]) [subform (inner[1]) [subform (inner[2]) [subform (inner[3]) [subform (inner[4]) [subform (outer[1])] [subform (inner[0]) [subform (inner[1]) [subform (inner[2]) [subform (inner[3]) [subform (inner[4]) [subform (outer[2])] [subform (inner[0]) [subform (inner[1])
keep.next="contentArea"] keep.next="contentArea"] keep.next="contentArea"] keep.next="contentArea"] keep.next="contentArea"] keep.next="contentArea"] keep.next="contentArea"] keep.next="contentArea"] keep.next="contentArea"] keep.next="contentArea"] keep.next="contentArea"] keep.next="contentArea"]
When these objects are inserted into the Layout DOM each group of inner subforms adheres together, but there is no adherence between groups of inner subforms or between inner and outer subforms.
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Note: The preferred syntax for expressing break conditions changed in XFA 2.4. The old syntax using the break element is still permitted but is deprecated and will be removed from some future version of this specification. The overflow, breakBefore, and breakAfter elements can force the layout processor to go to a particular contentArea or a particular pageArea. In either case, an attribute of the element provides either an XML ID or a SOM expression identifying the target. If there is an object of the correct type matching the XML ID or SOM expression the layout processor traverses the subtree below the pageArea in the Template DOM, taking the shortest route to get from the node corresponding to the current contentArea to the target node. (This traversal may have side-effects, which are discussed in Leaders and Trailers on page 272.) On the descending part of the traversal it adds new instances of pageSet and/or pageArea objects as appropriate to the Layout DOM. When the destination of the break is a pageArea, the layout processor then descends into a contentArea, adding new instances of contentArea objects to the Layout DOM if necessary. The break target can be specified via a SOM expression. The expression is evaluated in the context of the object that is currently being laid down. This is consistent with the rules for evaluating prototype references using SOM expressions; the using object supplies the context. A before or after break condition (but not an overflow break condition) can be controlled by a script at layout time. If a non-empty script is supplied within a breakBefore or breakAfter element, the layout processor executes the script at the appropriate time (just before or just after laying down the object). The script must return a Boolean value. If the script returns True the break is executed. If the the script returns False the break is inhibited. The three types of layout breaks are processed at a different times and under different circumstances. Consequently a single object may freely assert any two or all three. If the object being placed asserts breakAfter and the next object to be placed asserts breakBefore the two breaks are processed sequentially. Break conditions are also used with positioned layout, as discussed in Break Conditions on page 237.
Break on Entry
A subform may specify default behavior explicitly via a breakBefore element with a targetType attribute having a value of auto. Alternatively, it may specify that it must be placed inside an instance of a particular contentArea or pageArea. If the breakBefore element has a targetType property with a value of pageArea or contentArea, the layout processor gets a target specification from the value of the element's target property. If the target specification starts with the character # it is evaluated as a reference to an XML ID; otherwise it is evaluated as a SOM expression. If there is an object of the correct type matching the target specification the layout processor first checks whether the current container is within a contentArea or pageArea that is an instance of the one specified. If it is not, the layout processor breaks to the specified target. If the target is a pageArea then the layout processor traverses to the first unused (empty) child contentArea, as it would when flowing from one contentArea to the next. For example, a template contains the following declarations.
Example 9.19 Template employing break on entry into the root subform
<template > <subform name="X"> <breakBefore targetType="pageArea" target="#E_ID"/> <pageSet name="A"> <pageArea name="B"> <contentArea name="C" />
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<contentArea name="D" /> </pageArea> <pageArea name="E" id="E_ID"> <contentArea name="F" /> </pageArea> </pageSet> <field name="Y"> </subform> </template>
At startup the layout processor would by default descend into the first contentArea (C) of the first pageArea (B) of the first pageSet (A) of the root subform (X). Another way of looking at this is that by default there is an implied break to the first pageArea of the root subform. However, subform X asserts an explicit break to the pageArea with ID E_ID. This happens to be pageArea E. The layout processor traverses the tree of pageArea and contentArea nodes until it reaches the specified pageArea. Then it descends into the first contentArea there to place the layout content. The resulting Layout DOM is:
[root] [pageArea (E)] [contentArea (F)] [subform (X)] [field (Y) = "some user-supplied data"] Error Condition: Invalid break target
A conforming template must not supply a target specification for the breakBefore element that does not resolve to exactly one pageArea or contentArea. However it is anticipated that layout processors will encounter some templates that are not conforming in this way. It is recommended that in such a case the layout processor emit a warning and go to the next available pageArea or contentArea.
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At startup the layout processor descends into the first contentArea (C) of the first pageArea (B) of the first pageSet (A). The first content it finds in the Form DOM is subform X[0], which asserts that it must be placed into a new pageArea. This forces the layout processor to leave the current pageArea (even though it is empty) and create a new one. Then the layout processor places the field and its text data from first record into the instance of contentArea C. This small amount of text does not fill contentArea C. Now it comes to the second instance of subform X (X[1]). Again the startNew condition forces it to start a new pageArea, the third instance of pageArea B. After this it adds a new instance of contentArea C and places subform X[1] and its field into the new instance of contentArea C. The resulting Layout DOM is:
[root] [pageset (A)] [pageArea (B[0])] [contentArea (C)] [subform (W)] [pageArea (B[1])] [contentArea (C)] [subform (W)] [subform (X)] [field Y = "data from the first record"] [pageArea (B[2])] [contentArea (C)] [subform (W)] [subform (X)] [field Y = "data from the second record"]
If the above example (which has no boilerplate) is rendered and printed, the first page is blank. The root subform (subform W in the above example) may assert startNew, but it has no practical effect because the root subform always starts a new pageArea and contentArea.
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Note that the script is, as usual, evaluated in the context of the enclosing subform. The expression used tests for the existence of the previous record in order to avoid a run-time error on the first record. As a side effect on the first record the before break is inhibited because the script returns the value False which was returned by the exists() function. For all other records the customer ID for the current and previous records are compared and the break is executed only when they differ.
Inserting a Trailer
A trailer is an object which is laid down before any other action is carried out. In particular it is laid down before any movement to another pageArea or contentArea as mandated by the before break. A trailer on a before break has the same effect as a leader on an after break asserted by the previous layout object. In the following template fragment a before break trailer is used to lay down a message indicating that the text is continued overleaf.
If the breakBefore element supplies a script the trailer is only laid down if the script returns True..
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Inserting a Leader
A leader is an object which is laid down just before the before the object asserting breakBefore but after the break mandate has been carried out, that is, after moving (if necessary) to the break target. In the following template fragment a before break leader is used to lay down a heading. This is a common use of before break headers.
If the breakBefore element supplies a script the trailer is only laid down if the script returns True. A breakBefore leader may be combined with a bookend leader. The bookend leader is treated like part of the object that is being laid down, hence after the break mandate has been carried out the breakBefore leader is laid down first, then the bookend leader, then the content of the object itself.
Break on Exit
A layout object may use its breakAfter property to force the layout processor to traverse to a different pageArea and/or contentArea after laying down the object. The semantics and use of this property exactly mirror those of the breakBefore property which is discussed in Break on Entry on page 317. Despite this symmetry (or perhaps because of it) the handling of leaders and trailers may be confusing. When breakAfter specifies a trailer the trailer is placed after the current layout object but before moving to the break target. Conversely when breakAfter specifies a leader the leader is placed after moving to the break target. The same effect is produced when an object is used as a leader for an after break or as a trailer for the next objects before break. For example, assume that the Form DOM contains:
[subform (root)] [subform (TransactionDetails)] [subform (TermsAndConditions)]
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... </subform>
A breakAfter trailer may be combined with a bookend trailer. The bookend trailer is treated like part of the object that is being laid down, hence after the content of the object itself is laid down then the bookend trailer is laid down, followed by the breakAfter trailer, and then the break mandate is carried out.
Break on Overflow
A layout object may specify that when it does not fit in the current pageArea or contentArea, the object (or remaining fragment of the object) must be placed in a pageArea or contentArea matching a particular XML ID or SOM expression. This is done by specifying an overflow element. The XML ID or SOM expression is supplied as the value of the overflow elements target attribute. If overflow occurs and there is an object of the correct type matching the target specification, the layout processor breaks to the specified target. Note that there is no targetType attribute for overflow. It is not necessary because the target attribute uniquely specifies an object. If the value of target is the empty string (the default) then the overflow property has no effect. For example, a template contains the following declarations.
At startup the layout processor descends into the first contentArea (C) of the first pageArea (B) of the first pageSet (A). The first content it encounters in the Form DOM is subform X. It tries to place subform X into contentArea C but finds that it doesn't fit. So, it splits the subform and places the top fragment of it into contentArea C. At this point the overflow break comes into play. Instead of traversing to contentArea D as it would normally do, the layout processor traverses to the overflow target, which is contentArea F. There it puts the remainder of subform X (or at least as much of it as fits). Assuming the typeface is Courier and the typesize is 10 points, the result is:
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[root] [pageSet (A)] [pageArea (B)] [contentArea (C)] [subform (X)] [field (Y) = "lots and "] [pageArea (E)] [contentArea (F)] [subform (X)] [field (Y) = "lots of text that overflows the contentArea"]
In this example, the overflow break of subform X affects every new pageArea or contentArea (unless overridden by a lower-level subform) because the root subform in effect flows through the entire document.
Error Condition: Invalid break target
A conforming template must not supply a target specification for the overflow element that does not resolve to exactly one pageArea or contentArea. However it is anticipated that layout processors will encounter some templates that are not conforming in this way. It is recommended that in such a case the layout processor emit a warning and go to the next available pageArea or contentArea.
Example 9.27 Template combining break with maximum occurrence of a page area
<template > <subform name="O"> <pageSet name="A"> <occur max="-1"/> <pageArea name="B" id="B_ID"> <occur max="1"/> <contentArea name="C" /> </pageArea> </pageSet> <subform name="P"> <field name="Q"> </field> </subform> <subform name="R"> <breakBefore targetType="pageArea" target="#B_ID"> <field name="S"> </field> </subform> </subform>
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</template>
The layout processor lays out subform P first. This does not assert a break condition, so it is processed with default processing rules. After laying out subform P the Layout DOM contains:
[root] [pageSet (A)] [pageArea (B)] [contentArea (C)] [subform (O)] [subform (P)] [field (Q) = "text in field Q"]
Subform P does not fill contentArea C. However, the next subform to be laid out is R. This subform asserts a breakBefore break condition. The break condition could be satisfied by adding another instance of B to the Layout DOM as a sibling of the current pageArea. However pageArea B has an occurrence limit of 1. In order to respect both this occurrence limit and the break condition, the layout processor ascends to the pageSet and adds another sibling in the Layout DOM at that level. Then it descends to the contentArea level, adding new nodes to the Layout DOM of as it goes. The result is:
[root] [pageSet (A[0])] [pageArea (B)] [contentArea (C)] [subform (O)] [subform (P)] [field (Q) = "text in field Q"] [pageSet (A[1])] [pageArea (B)] [contentArea (C)] [subform (O)] [subform (R)] [field (S) = "text in field S"]
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Example 9.28 Template combining break with minimum occurrence on a page area
<template > <subform name="O"> <pageSet name="A"> <occur min="1"/> <pageArea name="B"> <contentArea name="C" /> </pageArea> <pageArea name="D" id="D_ID"> <occur min="2"/> <contentArea name="E" /> </pageArea> </pageSet> <subform name="P"> <field name="Q"> </field> </subform> <subform name="R"> <breakBefore targetType="pageArea" target="#D_ID"> <field name="S"> </field> </subform> </subform> </template>
The layout processor starts by descending to the first contentArea (C) of the first pageArea (B) of the first pageSet (A). It puts the subform P into contentArea C. At this point the Layout DOM contains:
[root] [pageSet (A)] [pageArea (B)] [contentArea (C)] [subform (O)] [subform (P)] [field (Q) = "text in field Q"]
Subform P does not fill contentArea C. However, the next subform to be laid out is R, which asserts a breakBefore condition at the pageArea level. The layout processor satisfies this condition by traversing to pageArea D and adding an instance of it to the Layout DOM. However, pageArea D asserts a minimum occurrence limit which forces the layout processor to incorporate another instance of it into the Layout DOM. After subform R has been processed the result is:
[root] [pageSet (A)] [pageArea (B)] [contentArea (C)] [subform (O)] [subform (P)] [field (Q) = "text in field Q"] [pageArea (D[1])]
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[contentArea (D)] [subform (O)] [subform (R)] [field (S) = "text in field S"] [pageArea (D[2])]
Hence when the form is rendered and printed single-sided it will have an extra page at the end. Since the pageArea for the extra page includes neither boilerplate nor variable data, the extra page will be blank. The rules for pageArea traversal can be summarized as follows: 1. Both pageArea and pageSet may assert occurrence limits. For both pageArea and pageSet the occurrence minimum defaults to zero and the maximum defaults to -1 (no limit). 2. pageSet is always considered ordered. 3. Breaking from one pageSet or pageArea to another pageSet or pageArea forces the incorporation of instances of any intermediate pageSet and pageArea objects up to their individual minimum occurrence limits. 4. Unless specified otherwise, the root subform has an implied break to the first contentArea in the first pageArea. 5. Only the first pageSet under the root subform is ever used.
10
Automation Objects
This chapter describes the automation objects: calculate, validate, and event. It describes how automation objects are typical used, how they are activated, and how they interact with other automation objects. The processing application invokes automation objects in response to a trigger particular to the type of object. Examples of such triggers include a form loading or a user clicking a field. When an automation object is invoked, it performs some task particular to the type of object. Examples of such tasks include executing a script or executing a web services file. The tasks that can be performed are particular to the type of automation object.
Set an initial value, by providing non-empty content in a value element. A static value would be defined by the template designer. Bind data to a value. Such data is provided by an external source, such as a person filling in the form or by a database server. Derive a value dynamically, likely from other form values or ambient properties such as date and time. Such a value is defined using the calculate element.
327
XFA Specification How Script Elements Are Used Within Automation Objects
328
Derive a Boolean value that indicates whether the current value of a form object is valid validate element
The field object supports both calculations and validations. Additionally, the subform and exclusion group elements also support validation to allow aggregate-level validations. The calculate and validate elements enclose scripting to derive a value and return it to the processing application. Any scripting that is invoked by these elements must not attempt to alter the state of the form object model in any way. Not all scripting language implementations or processing applications may be able to enforce this restriction, so form templates should adhere to this restriction if they are designed to be interoperable. The calculate and value elements are related in that each of them can be used to set an initial value. Scripts in calculate and validate elements are interpreted as expressions. The value of such an expression is returned to the processing application. For scripting languages that cannot be interpreted as an expression, the binding of the scripting language to the XFA object model may include some facility for explicitly returning a value. Calculate and validate scripts are not passed any parameters from the processing application. The following form shows a simple purchase order application, and illustrates how calculations and validations might be used on such a form.
XFA Specification How Script Elements Are Used Within Automation Objects
329
A subset of the XML used to defined this purchase order form might be as follows.
An explanation of the FormCalc expressions used in this sample is contained in the FormCalc Specification on page 902. The Quantity field is validated to ensure that it is no less than zero and no more than 19. The UnitPrice field is validated to ensure it is not negative. The Amount field is calculated from the other fields in the same Detail subform. The ShipDate field is calculated as the current date plus two days. The Total field is calculated as the sum of the Amount fields from all three instances of the Detail subform, formatted as ten digits with two after the radix point. The scripts in calculations, validations and events may specify whether the script is to be executed at the client, the server, or both. See Specifying Where to Execute a Script on page 359.
Document Variables
Document variables may be used to hold boilerplate or image references that can be inserted conditionally under control of a script or they may be used to define script object references.
</field> <field y="9.525mm" w="60.325mm" h="9.525mm"> <ui> <checkButton shape="round"> </checkButton> </ui> <caption > <value> <text>Dog Lover</text> </value> </caption> <items> <integer>2</integer> </items> </field> </exclGroup> </subform>
It is conventional to place a single variables element in the root subform to hold all document variables, but this is only a convention. Any subform can hold a variable element.
<field name="f1"> <!-- this example assumes naked references are available --> <calculate> <script contentType="application/x-javascript"> foo.x = 2; foo.y = 2; foo.factor = 2; </script> </calculate> </field> <field name="f2"> <!-- this example assumes naked references are available --> <calculate> <script contentType="application/x-javascript"> foo.sum(foo.x, foo.y); </script> </calculate> </field> <field name="f3"> <!-- this example doesn't use naked references --> <calculate> <script contentType="application/x-javascript"> xfa.form.form1.foo.x = 4; xfa.form.form1.foo.y = 4; xfa.form.form1.foo.factor = 4; </script> </calculate> </field> <field name="f4"> <!-- this example doesn't use naked references --> <calculate> <script contentType="application/x-javascript"> xfa.form.form1.foo.sum(xfa.form.form1.foo.x, xfa.form.form1.foo.y); </script> </calculate> </field> </subform> </template>
After the XFA processing application completes data binding the above template, it executes the resulting forms calculations. If those calculations are executed in the order f1 to f4, the following results occur: 1. The data binding algorithm instantiates the subform named form1, which interns creates an instance of the script object foo, by compiling the contents of script element. 2. The calculation on the field named f1 fires, setting variables on foo to x = 2, y = 2 and factor = 2. 3. The calculation on the field named f2 fires, which calls the sum function on foo ((2+2)* 2), resulting in the field value being set to 8. 4. The calculation on f3 fires, setting variables on foo to x = 4, y = 4 and factor = 4. 5. The calculation on f4 fires, which calls the sum function on foo ((4+4)* 4), resulting in the field value being set to 32.
Note: The above result sequence assumes the post-binding execution of calculations proceeds in order from f1 to f4. There is no guarantee that this will be the execution order.
Calculations
This section explains how the processing application supports the calculate element represented in the Form DOM. It describes how the calculate element relates to other automation elements, when the processing application activates calculation scripts, where it stores the result of the calculation, and how it observes precedence in interconnected calculations. The Template Specification describes the syntax of the calculate element.
About
The calculate element is one of the family of automation elements. The other automation elements are event and validate. Automation elements are procedural extensions to the XFA architecture. The calculate element provides a means of calculating the value of a container element, with the calculation being represented as a script. The parameters in such a script may include the values of other container objects. The XFA processing application is responsible for updating the value of the container element with the value returned from the calculate script, although this obligation does not apply to subform calculate elements. The calculate element can be a child of the container elements: exclGroup, field, and subform. It specifies a script to use for calculating the value of its parent container, and it specifies override conditions. Such conditions specify whether a processing application can allow a user to override a calculated value, and if so, what types of warnings should be issued.
Activation
This section describes the stimuli that cause the processing application to activate calculate elements. Many of those stimuli also trigger the processing application to activate the other automation elements, event and validate. In cases where a single stimuli triggers multiple automation elements, the order of activation is as follows: (1) event elements, (2) calculate elements, and (3) validate elements. (See Order of Precedence for Automation Objects Activated by the Same Trigger on page 353.) The processing application activates calculate elements when the value of the field, subform, or exclusion group changes. Those values can change as a result of any of the following actions:
Data-binding. As a final phase of data-binding, the processing application activates all calculate elements. It also re-activates calculate elements, as described in Cascading value changes. During the initial data-binding (data merge), the only data present in the Form DOM are default values supplied by the Template DOM. During subsequent data-bindings (data re-merges), the values from calculation scripts reflect the current data in the Data DOM and, where needed, default field values from the Template DOM.
Interactive data entry. A processing application allows users to enter data, without repeating the data-binding process. Such entries simultaneously change values in the form and Data DOM. When a user enters data, the processing application activates calculate elements that are dependent on that containers value. It may also re-activate other calculate elements, as described in Cascading value changes.
Cascading value changes. In some cases, multiple calculate elements may depend on one another, in a cascading relationship. In other words, a change to the value of one field can influence the calculated values of many others. In such cascading calculations, the processing application re-activates calculate elements, as the values on which they depend change. References to named script objects are not considered in determining dependencies. That is, if a calculation includes a reference to a property or method of a named script object and the properties of that object are changed by another calculation, the calculation under consideration is not re-activated (Variables Used to Define Named Script Objects on page 331). In other words dependencies due to self-modifying or mutually-modifying scripts are not detected. If the calculation of an element references its own value, either directly or indirectly, a circular reference is said to exist. The following points address responsibilities related to circular references:
XFA form creators. It is the responsibility of XFA form creators to prevent circular references from being specified in calculate scripts. Such checks should be done concurrently with form creation, rather than through the addition of validation scripts. Processing application. It is recommended that the processing application provide some means of identifying and terminating the execution of seemingly infinite loops.
Note: Scripts do not manage calculation dependencies; rather, the processing application is responsible for managing calculation dependency on behalf of the form. (See Scripting on page 358.)
Result
The processing application uses the result of executing the calculation script as described below: Parent element
field exclGroup
Result destination in the parent element Replaces the value of the field container element. Replaces the value of the exclGroup container element. This action has the side effect of changing the state and value of the fields contained in the exclusion group.
subform elements do not have explicit values; however the result of a subform calculate script can be used to initiate some other function unrelated to setting a value.
subform
Validations
This section describes the nature of validation, what types of tests are included in validation, when validation is done, and how an interactive XFA processing application interacts with a user when validation fails. Validation allows a template designer to specify a set of tests to be performed on a field, subform, or exclusion group. As with calculations, validation tests are triggered by changes to the field, subform, or exclusion group.
About
As compared to UI validation
In an interactive context, the UI may perform some validation. For example, a numeric edit widget will not accept letters of the alphabet as input. However this type of validation does not apply to non-interactive applications, because they have no UI. Furthermore, this type of validation is quite limited. It cannot, for example, compare the numeric content of two fields to validate that one is larger than the other. Validation scripts provide a mechanism to perform validations that are more intelligent and that, optionally, apply in non-interactive as well as interactive contexts.
Type of testing. While some XFA validation tests have counterparts in XML validation, XFA validation also supports scripted tests. Such tests support highly specific validation for containers that can consider the values of other fields. Activation of tests. Activation of XFA validation for specific container may be independent of activation for validation in other containers and may be triggered at various stages in the life of the a form. For example, XFA validation may be done at all of the following stages: when the focus leaves a field (after data is entered), when a button is clicked, and when the form is committed. In contrast, XML validation is an all-or-none endeavor and would be performed just before committing the form. Unfortunately, such errors occur too late in the forms life for a user to respond. Consider a users response to being pelted with numerous validation error messages, when attempting to commit (submit) a form with numerous inter-related fields.
Not applicable
Not applicable
Execution order 3 Test type Format test (formatTest). The format of the value must match the picture clause specified in the validate element. Script test (scriptTest). The script supplied in the validate element must return a true value for a script test to succeed. Field
For any field, subform, or exclusion group. All validation tests specified for a field, subform, or exclusion group must succeed for the form object's value to be considered valid. If any test fails, the XFA processing application responds, as described in Responding to Test Failures on page 338. As described in the Localization and Canonicalization on page 139, the result of any presentation formatting defined for the form object does not alter the value of the form object it remains unformatted. Therefore, validation tests (nullTest, formatTest, and scriptTest) are performed against the unformatted value.
Activation
Validate elements can be activated multiple times during the life of a form.
Initialization
When an XFA-processing application initializes a form, it executes all validation tests specified for the form.
Interactive
An interactive XFA application performs the tests in a validation element upon exit from the field or subform, provided the user has entered a value of the field or subform. The application is not required to perform the validation tests if the value of the container object is unchanged. An interactive XFA application also performs the tests in all validation elements when trying to commit the form. A form is said to be committed when it is in a final state, such as when it is submitted to a server.
Non-Interactive
An XFA application may perform the tests in validation elements after the data binding (merge) operation completes. This is optional because there is no point to a validation complaining about a field being empty when the partly-blank form is only going to be printed on paper so that blank fields can be filled in with pen and ink. The same situation occurs when a partly-blank form is going to be rendered into an interchange format (such as HTML) to send to a non-XFA client for filling in. See Order of Precedence for Automation Objects Activated by the Same Trigger on page 353.
Example 10.4
<field name="LoanAmount" > <value> <integer/> </value> <bind> <picture>zzzzz9</picture> </bind> <validate formatTest="error" scriptTest="error"> <message> <text name="formatTest"> You must enter a number between 0 and 999999. </text> <text name="scriptTest"> You are a security risk, so we cannot lend you more than $1000. </text> </message> <picture>zzzzz9</picture> <script> (not SecurityRisk) | (SecurityRisk & (LoanAmount < 1000)) </script> </validate> </field> <field name="SecurityRisk" y="30.00mm" x="13.49mm" w="12.44mm" h="9.26mm"> <value> <integer>1</integer> </value> </field>
Example 10.5 Fragment specifying a formatting test that data must pass
<validate formatTest="error"> <picture></picture> </validate>
In addition there is a datatype test for which the error response is implied, as described in The datatype test on page 340. The following sections describe the attributes of the validate element that control error response levels.
The form object is permitted to have a value of null; that is, the field can be left without a value, and it will not negatively impact the validity of the form. This attribute value disables this validation test.
warning
The form object is recommended to have a non-null value. If the user does not supply any value for the form object or explicitly sets the value to null, the processing application will present the warning message. The message must inform the user that the form object is recommended to have a value, and provide two choices: dismiss The user understands the form's recommendation and wishes to return to the form, so that s/he may satisfy this constraint. override The user understands the form's recommendation, but has chosen to contravene this constraint.
error
The form object is required to have a non-null value. Failure to provide a non-null value shall constitute an error. The processing will present an error message, and the form object considered invalid. XFA application may skip the remaining validations for the field or exclusion group.
the form object is permitted to have a value that does not conform to the input mask; that is, the field can be left with a non-conformant value, and it will not negatively impact the validity of the form. This attribute value disables this validation test.
warning
The form object is recommended to have a value that conforms to the input mask. If the user does not supply such a value, the processing application will present the warning message. The message must inform the user that the form object is recommended to have a value that conforms to the input mask, and provide two choices: dismiss The user understands the form's recommendation and wishes to return to the form, so that s/he may satisfy this constraint. override The user understands the form's recommendation, but has chosen to contravene this constraint.
error
The form object is required to have a value that conforms to an input mask. Failure to provide such a value shall constitute an error. The processing will present an error message, and the form object is considered invalid. XFA application may skip the remaining validations for the field.
The form object is permitted to have a value that does not conform to the script; that is, the field can be left with a non-conformant value, and it will not negatively impact the validity of the form. This attribute value disables this validation test.
warn
The form object is recommended to have a value that conforms to the script. If the user does not supply such a value, the processing application will present the warning message. The message must inform the user that the form object is recommended to have a value that conforms to the script's constraints, and provide two choices: dismiss The user understands the form's recommendation and wishes to return to the form, so that s/he may satisfy this constraint.
override The user understands the form's recommendation, but has chosen to contravene this constraint.
error
The form object is required to have a value that conforms to the script. Failure to provide such a value shall constitute an error. The processing will present an error message, and the form object is considered invalid.
Events
In XFA templates, scripts may be associated with particular events. An event is a particular change of state in the form. When the particular change of state happens, the actions associated with the event are automatically invoked. Those actions may be any of the following:
Script. A script property specifies a set of scripted instructions that can perform a variety of actions, such as transforming the data, changing the presentation of the data, or triggering other events. See Scripting on page 358. Execute. An execute property invokes a WSDL web service. Such a service can be used to initate a complex interaction with a server. See Using Web Services on page 393. Submit. A submit property invokes an HTTP protocol to send all or part of the form to a server, and in some cases to accept new data provided by that server. See Submitting Data and Other Form Content to a Server on page 386. Sign. A signData property causes a signature handler to create an XML digital signature, as specified in the signData property. See XML Digital Signatures on page 482.
The object whose change of state triggers the event is called the target. There are six general classes of events, distinguished by the type of target. Some events in different classes share the same name because they are similar in function, however they are distinct events because an event is distinguished by both name and target. In addition calculations and validations are very much like events and can be treated as special types of events. This section describes the types of events assigned to each class of event.
Application Events
Application events are triggered by actions of the XFA application. Because application events are not directly linked to user actions, they are triggered in both interactive and non-interactive contexts. The script in an application event can reference the event object using the SOM expression xfa.host, or the alias $host, as described in Internal Properties and Methods on page 85 The application events are as follows:
docClose
This event fires at the very end of processing if and only if all validations succeeded. Success in this case is defined as generating nothing worse than a warning (no errors). Note that this event comes too late to modify the saved document; it is intended to be used for generating an exit status or completion message.
docReady
This event fires before the document is rendered but after data binding. It comes after the ready event associated with the Form DOM.
postPrint
This event fires just after the rendered form has been sent to the printer, spooler, or output destination.
prePrint
This event fires just after the form has been written out in PDF or XDP format. It does not occur when the Data DOM or some other subset of the form is exported to XDP.
preSave
This event fires just before the form data is written out in PDF or XDP format. It does not occur when the Data DOM or some other subset of the form is exported to XDP. XSLT postprocessing, if enabled, takes place after this event.
DOM Events
DOM events trigger when a DOM changes state. Because they are not directly linked to user actions, they are triggered in both interactive and non-interactive contexts. A script binds to a DOM event by expressing a ref property whose value is a SOM expression pointing to the DOM. For example, the value xfa.form (or its alias $form) binds to the Form DOM. The following DOM events are defined:
ready
The ready event fires after an XFA DOM has finished loading. This event applies to the Form DOM and the Layout DOM. It does not apply to the Template DOM or Data DOM primarily because it would be difficult for an XFA application to ensure that the scripts were loaded and bound to the events before the events fired. In the case of the Form DOM ($form) it fires after the Template and Data DOMs have been merged to create the Form DOM, and the calculations and validations have fired. In addition, the ready event fires when the current data record advances. See Exchanging Data Between an External Application and a Basic XFA Form on page 109 for more information about processing data as records. In the case of the Layout DOM ($layout), the ready event fires when the layout is complete but rendering has not yet begun. Thus a script can modify the layout before it is rendered.
preSubmit
This event triggers whenever form data is submitted to the host via the HTTP protocol, just after the data has been marshalled in the Connection Data DOM but before the data is submitted to the host. A script triggered by this event has the chance to examine and alter the data before it is submitted. If the script is marked to be run only at the server, the data is sent to the server with an indication that it should run the associated script before performing the rest of the processing. The preSubmit event applies only to the Form DOM ($form). Note that preSubmit does not distinguish between submissions initiated by different button pushes or to different URLs. Any script that needs to make these distinctions must include code to find out what button was pushed. In general preSubmit is analogous to preSave and serves a similar purpose. For example, consider the following template fragment.
In this example the click events from either of two fields initiate the submission of form data to a host. There is a script associated with the Form DOM's preSubmit event, so when either field is clicked, the outgoing data is marshalled, the preSubmit script runs, then the submit transaction takes place. The preSubmit script uses the $event object to find out which click event triggered it. The $event object is described below in the section Properties on page 348.
Subform Events
Subform events trigger in response to changes of state which affect subforms. Some are generated in interactive contexts and some in both interactive and non-interactive contexts. A script binds to a subform event by expressing a ref property whose value is a SOM expression pointing to the subform. The subform events are as follows:
enter
This event triggers when some field directly or indirectly within the subform gains keyboard focus, whether caused by a user action (tabbing into the field or clicking on it with the mouse) or by a
script programmatically setting the focus. It is not triggered by keyboard focus moving to another field within the same subform focus must come in from outside the subform.
exit
This event triggers when keyboard focus is yielded from a field directly or indirectly within the subform to a field or other object outside the subform. It is not triggered by keyboard focus moving to another field within the same subform focus must go out from inside the subform.
initialize
This event triggers after data binding is complete. A separate event is generated for each instance of the subform in the Form DOM.
This event triggers when some field within the exclusion group gains keyboard focus, whether caused by a user action (tabbing into the field or clicking on it with the mouse) or by a script programmatically setting the focus. It is not triggered by keyboard focus moving to another field within the same exclusion group focus must come in from outside the exclusion group.
exit
This event triggers when keyboard focus is yielded from a field within the exclusion group to a field or other object outside the exclusion group. It is not triggered by keyboard focus moving to another field within the same exclusion group focus must go out from inside the exclusion group.
initialize
This event triggers after data binding is complete. A separate event is generated for each instance of the exclusion group in the Form DOM.
Field Events
Field events trigger in response to user actions which affect a field. Some are generated in interactive contexts and some in both interactive and non-interactive contexts. A script binds to a field event by expressing a ref property whose value is a SOM expression pointing to the field. The field events are as follows:
change
This event triggers when the content of the field is changed by the user. This event triggers on every keystroke as long as the field has keyboard focus. It also triggers when the user pastes into the field, makes a selection from a choice list or drop-down menu, checks or unchecks a checkbox,
or changes the setting of a set of radio buttons. It is not triggered by content changes that are made by the XFA application, for example calculations, nor is it triggered by a merge operation.
click
This event triggers when a mouse click occurs within the region.
enter
This event triggers when the field gains keyboard focus, whether caused by a user action (tabbing into the field or clicking on it with the mouse) or by a script programmatically setting the focus. It also triggers when a new selection is made in a choice list, but this behavior can be inhibited. See below.
exit
This event triggers when the field loses keyboard focus. It also triggers whenever a new selection is made in a choice list (followed by an enter event), but this behaviour can be inhitibited. See below.
full
This event triggers when the user has entered the maximum allowed amount of content into the field and tries to enter more content.
initialize
This event triggers after data binding is complete. A separate event is generated for each instance of the field in the Form DOM.
mouseDown
This event triggers when the mouse button is depressed at a moment when the mouse pointer is within the region.
mouseEnter
This event triggers when the user moves the mouse pointer into the region of the field, without necessarily pressing the mouse button. It is not triggered when the mouse pointer moves into the field for some other reason, for example because an overlying window closes.
mouseExit
This event triggers when user moves the mouse pointer out of the field, whether the mouse button is depressed or not. It is not triggered when the mouse pointer moves out of the field for some other reason, for example because an overlying window opens.
mouseUp
This event triggers when the mouse button is released at a moment when the mouse pointer is within the region.
preOpen
This event applies only to drop-down choice lists, or more specifically choice lists for which open="userControl" or open="onEntry". This event is intended to house scripts that add choices to the choice list. It is especially useful when the choice list is infrequently used and its choices take a while to load. The form object model method addItem() is particularly useful in scripts triggered by preOpen events. addItem() is described in the LiveCycle Designer ES Scripting Reference [LC-Scripting-Reference].
User clicks on the symbol that causes the choice list to drop down. This symbol is usually a down arrow. While the choice list is in focus, the user presses the keyboard sequence that causes the choice list to drop-down. In this situation, the choice list gains focus through some mechanism other than clicking, such as tab-order traversal or clicking the associated text box. Any script calls the $host.openList() method with a parameter pointing to the field which contains the choice list object. This causes the preOpen event to be triggered and also causes the choice list to gain focus. openList() is described in the Adobe XML Scripting Object Reference [LC-Scripting-Reference].
This event does not trigger in response to the user pressing the Enter key while the combo box has the focus. It is recommended that users be provided with some sort of feedback mechanism before the script is executed. The script might block interaction for a time, which would be an unexpected characteristic of choice lists. Starting with XFA 2.4 the issuing of events in a choice list field was modified. In versions of XFA prior to 2.4 an exit event was generated whenever a selection was clicked in the choice list, but an enter event was only generated on the first click, as long as the choice list held focus between clicks. In consequence when the user changed the selection without first transferring focus outside the choice list, consecutive exit events were generated without an enter in between. In XFA 2.4 this behavior was corrected. When the user commits a selection by clicking on it or pressing Enter an exit event is generated, even though focus remains on the choice list. If the user subsequently clicks on a selection or presses enter another enter event is generated, followed by an exit event. However each enter event that would not have been generated prior to XFA 2.4 is identified as such by its reenter property as described in reenter on page 352. Normally the XFA processor is required to display the new choice list behavior whenever the XFA schema specified by the template is 2.4 or above. However to facilitate editing and updating older templates, without necessarily having to rewrite the templates scripts, a processing instruction is provided which forces the XFA processor to follow the older behavior even though the template references a newer schema. An example of this processing instruction follows.
The first parameter in the originalXFAVersion processing instruction is an XFA namespace URI. When this indicates version 2.4 or later, meaning the template started life in XFA version 2.4 or greater, the processing instruction is ignored and the XFA 2.4 behavior is always followed. Otherwise any remaining parameters are inspected. If there is an additional parameter with the value LegacyEventModel:1 the pre-2.4 behavior is followed. Otherwise the XFA 2.4 behavior is followed. In the example the XFA schema in use by the template is 2.6 but there is an originalXFAVersion processing instruction, the original XFA version is 2.1, and there is a LegacyEventModel:1 parameter so the pre-2.4 behavior is followed.
Connection Events
Connection events trigger in response to activity in a link between the XFA processor, acting as a client, and some external processor providing a web service. Because connection events are not directly linked to user actions, they are triggered in both interactive and non-interactive contexts. An script binds to a connection event by expressing a ref property whose value is a SOM expression identifying the connection. The connection events are as follows:
postExecute
This event triggers when data is sent to a web service via WSDL, just after the reply to the request has been received and the received data is marshalled in the Connection Data DOM. A script triggered by this event has the chance to examine and process the received data. After execution of this event the received data is deleted.
preExecute
This event triggers when a request is sent to a web service via WSDL, just after the data has been marshalled in the Connection Data DOM but before the request has been sent. A script triggered by this event has the chance to examine and alter the data before the request is sent. If the script is marked to be run only at the server, the data is sent to the server with an indication that it should run the associated script before performing the rest of the processing. For example, consider the following template fragment and accompanying connection set.
In this example the click events from either of two fields initiate a web service transaction. There is a script associated with the connection's postExecute event, so when either field is clicked, the outgoing data is marshalled, the web server transaction takes place, the resulting incoming data is marshalled, then the postExecute script runs.
This event fires to tell an object that it has just been added to an array or that its position in the array (its subscript) has changed. The objects position can change because another object was added in front of it or because an object was removed in front of it. When field objects are created and added to an array by data binding, the initialize event fires before the indexChange events. All of the objects managed by a particular instance manager share the same declaration in the template and therefore the same script. However there is a property instanceIndex which holds the zero-based index of the current object. This can be used by the script to take different actions in different instances. For example, in the following fragment the color of the cell is dependent on the position of the cell and is recalculated whenever the position of the cell changes.
Example 10.10 Fragment using the instance manager to obtain its own index
<field name="itemValue"/> <event activity="indexChange"> <script> // Whenever a cell is added or moved re-color the cell. var index = this.instanceIndex; if (index % 5) this.color.value = "225,0,0"; else this.color.value = "0,255,0"; </script> </event> </field>
As explained in Activation on page 333, the XFA processor performs automatic dependency tracking to ensure that calculations are recomputed for all affected objects whenever necessary. Recalculation is performed whenever an instance is added, deleted, or moved for all calculations that use objects in the affected array. For example, the Total field in the following fragment has a dependency upon the Detail subform. Hence the XFA processor recalculates the value of the Total field whenever an instance of the Detail subform is added, deleted, or moved.
Example 10.11 Fragment that recalculates when the instance manager adds an instance
<subform name="Detail"> <occur min="0" max="10"/> <field name="ItemValue" ></field> </subform> <field name="Total" >
<calculate> Sum(Detail[*].ItemValue); </calculate> </field> <field name="AddDetail" > <event activity="click"> <ui><button/></ui> <caption><value><text>Add a detail record</text></value></caption> <script> _Detail.addInstance() </script> <event> </field>
Properties
There are two general categories of events, primary events which correspond to a user action and secondary events which are triggered by an internal change of state. Primary events update some or all of the primary properties of an object called xfa.event (more commonly known by the alias $event). By contrast, secondary events do not update the primary properties of $event. If a secondary event results from a primary event then the primary properties of $event during the secondary event have the values set by the primary event. However, secondary events may set secondary properties of $event. It is an error for a script to try to use a property that is not set in the current context. The following table shows which properties are set by each primary event: Target Type
subform
Event Name
enter exit
field
field
exit
field
change
change keyDown fullText modifier name newContentType newT prevContentType prevText selEnd selStart shift start target
field
full
In addition, the following secondary events set secondary properties but don't change any primary properties: Target Type
connection
Event Name
preExecute postExecute
In addition, a script may conjure up an event from thin air using the $event object. Only the name and target properties are initialized when an event is created this way. It is up to the script that creates the event to assign values to the remaining relevant properties of $event before triggering the event. Most properties of $event are read-only. The exceptions are the selStart, selEnd and change properties which are writable as well as readable.
selStart, selEnd, prevText, newText, and change are used together. The change property holds the text which is inserted into the field. Assigning to the change property replaces the typed or pasted characters with the characters from the assigned string. prevText holds the contents of the field as it was prior to the event. newText is read-only and yields the text that is placed into the field after the script has terminated. The value of newText changes in response to changes in the values of change, selStart, and selEnd. selStart and selEnd control which characters in the prevText is replaced by the characters in change. Like a UI text edit cursor, selStart and selEnd do not point to characters but to the boundaries between characters. A value of zero points in front of the first character in the field, one points in between the first and second characters, two in between the second and third characters, and so
on. When a change or full event occurs, if characters were selected in the field, selStart and selEnd are set to bracket the selected characters. By contrast, if no characters were selected, selStart and selEnd are both set to the text entry cursor position. selStart is always smaller than or equal to selEnd. Changing selEnd also repositions the text entry cursor in the UI. For example, suppose the original content of the field was abcd (right). The user selected bc and then typed g. When the change event script is invoked, the value of prevText is abcd, the value of change is g, the value of selStart is 1, the value of selEnd is 3, and the value of newText is agd. If the script does not modify any of the change, selStart, or selEnd properties the letter g replaces the selected characters bc as one would expect. The blue ^ shows the location of the text entry cursor after the operation.
prevText
abcd 1 3
selEnd change
selStart
agd newText ^
Now suppose that the script assigns the value xyz to the change property, as follows:
xfa.event.change = "xyz"
Since selStart and selEnd haven't been changed (yet) the value of newText becomes axyzd. In other words the string xyz will replace the selected characters, as though the user had pasted xyz instead of typing g. This is shown at right. After this the script changes the value of selEnd from 3 to 1, which happens to equal the value of selStart:
xfa.event.selEnd = 1
prevText
abcd 1 3
selEnd change
selStart
abcd
rt
1 1
selEnd change
$event properties
The individual properties of $event are described below:
change
When a change or full event occurs, this property holds the text that is to be inserted or updated. When referenced this property yields a string. Assigning to this property replaces the typed or pasted text with the value assigned. For example, the following fragment shows a script that converts the entered text to upper case.
Describes what happened to the value in the field when the form field lost focus. The value of this property must be one of: 0 The value was not committed (for example, the escape key was pressed) 1 The value was committed by a click of the mouse outside the field 2 The value was committed by pressing the enter key 3 The value was committed by tabbing to a new field
fullText
If the user pastes into a field, the field may truncate the pasted text. The full (untruncated) value is stored in this property. Content type is indicated by $event.newContentType.
keyDown
A Boolean that is true if the arrow key was used to make a selection, otherwise false.
modifier
A boolean that is true if and only if the modifier key (the control or Ctrl key on Microsoft Windows) was held down during the event.
name
Content type of the new data. The value of this property must be one of:
allowRichText
The field supports rich text. If the content is rich text, it is marked up as described in the Basic Data Binding to Produce the XFA Form DOM on page 159.
plainTextOnly
The field does not support rich text. Even if markup is present in the data it should be passed through rather than interpreted. However it is not guaranteed whether or not downstream processing will respond to the markup. In this version of XFA, the values of the newContentType and prevContentType properties are always the same. It is anticipated that future versions will allow for them to differ.
newText
Content type of the data before it changed. The value of this property must be one of:
allowRichText
The field supports rich text. If the content is rich text it is marked up as described in Basic Data Binding to Produce the XFA Form DOM on page 159.
plainTextOnly
The field does not support rich text. Even if markup is present in the data it should be passed through rather than interpreted. However it is not guaranteed whether or not downstream processing will respond to the markup. In this version of XFA, the values of the newContentType and prevContentType properties are always the same. It is anticipated that future versions will allow for them to differ.
prevText
Boolean which is false for a non-choice-list field or for the first enter event generated after a choice list gains focus. It is true for subsequent enter events generated while the same choice list still has uninterrupted focus.
selEnd
Ending position in prevText of the text to be replaced with the value of change. This is a 0-based index into the boundaries between characters. If no text was selected this is set to the position of the text entry cursor at the time the change was made. This property is read-write. Changing the value of this property changes which characters is replaced by the value of change and also repositions the text entry cursor.
selStart
Starting position in the prevText of the change window. This is a 0-based index into the boundaries between characters. If no text was selected this is set to position of the text entry cursor at the time the change was made. This property is read-write. Changing the value of this property changes which characters is replaced by the value of change.
shift
A boolean that is true if and only if the shift key was held down during the event.
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353
soapFaultCode
The fault code returned by the SOAP operation within the faultcode child of the Fault element, as described in [SOAP1.1]. If no Fault element is returned this defaults to the empty string . This is a secondary property.
soapFaultString
A human-readable string returned by the SOAP operation within the faultstring child of the Fault element, as described in [SOAP1.1]. If no Fault element is returned this defaults to the empty string . This is a secondary property.
target
The object whose change of state triggered the event. This property is of type XFANode.
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Multiple events may be triggered by a single change of state or user action. For example, tabbing from the current field to the next field triggers both the exit event for the current field and the enter event for the next field. If the current and next fields are in different subforms a total of four events are triggered, namely, exit events for the current field and subform and enter events for the next subform and field. It is necessary for script authors to know in what order their event scripts being executed. The order of event generation, including calculates and validates, is governed by the following rules.
Rule 1: Enter/exit events, calculations and validations
This section describes the order in which an XFA processing application executes enter and exit events, calculations and validations that are triggered by the same change of state. This section describes a change in focus caused by the users selection and change in focus caused by the user tabbing from one field/subform to another. When focus moves from one field, exclusion group, or subform to another, validations and exit events precede enter events 1. When focus leaves a field, exclusion group, or subform, calculation and validation precedes the exit event 2. Calculations, validations and exit events for nested elements occur in order from inner to outer element 3. Calculations, validations sand enter events for nested elements occur in order from outer to inner element Note that although the order of validations is well-defined, this should not make any difference to the script writer, because validations can not legally make any changes to the DOMs. They are only allowed to inspect values and return true (valid) or false (invalid). For example, consider the following template fragment.
When the user tabs from field A to field B the order of events is: 1. Validation for field A
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2. Exit event for field A 3. Validation for subform X 4. Exit event for subform X 5. Enter event for subform Y 6. Enter event for field B
Rule 2: Full and change events
For full and change events triggered by the same change of state the change event occurs before the full event. For example, consider the following template fragment.
When the user types the last allowed character into field A, the order of events is: 1. change event for field A 2. full event for field A
Rule 3: Merge completion
For calculations, validations, and initialize events triggered by the completion of a merge operation:
All calculations are done, then all validations, and then all initialize events are triggered Calculations are repeated if the values on which they depend change The order of validations is not defined Initialize events occur in order of depth-first traversal of the Form DOM
It should not matter to the script writer that the order of validations is not defined, because validations can not legally make any changes to the DOMs. They are only allowed to inspect values and return true (valid) or false (invalid).
Rule 4: Scripts That Trigger (Invoke) Other Events
A script may cause changes of state that in turn trigger or invoke other events. It may also directly declare an event. Thus, a script triggered by one event can indirectly invoke other events. In such cases the order of execution is implementation-defined and the scripts may even run concurrently. For example, the following template fragment illustrates a script triggered by one event (form ready) that in turn explicitly triggers another event (enter to field A).
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/>
The line highlighted in bold causes an enter event to be triggered for field A, even though no change of focus occurs. The above expression $form.root.A.enter() has the following parts:
$form references the Form DOM. $form is described in Scripting Object Model on page 74. $form.root.A references the specific field in the Form DOM.
$form.root.A.enter() triggers the enter events contained in the referenced field. For a field, the enter event triggers when the field gains keyboard focus.
In the above example, the order of execution of the fields enter event script and the portion of the form ready script after the highlighted line is undefined. The following template fragment illustrates a script performing an action (changing keyboard focus) which indirectly triggers another event.
Example 10.17 A script that changes focus to another field, invoking that fields enter event
<subform name="root"> <event activity="ready" ref="$form"> <script contentType="application/x-ecmascript"> $host.setFocus(xfa.resolveNode("$form.root.A")); </script> </event> <field name="A"> <event activity="enter" ref="$" /> </field> </subform>
In an interactive context the line highlighted in bold causes keyboard focus to change, with the side effect of generating an enter event for field A (unless field A already had keyboard focus). The above expression host.setFocus(xfa.resolveNode("$form.root.A")); has the following parts:
$host pertains to anything not specifically associated with a DOM. $host is described in Scripting Object Model on page 74. xfa.resolveNode("$form.root.A") returns the node which matches the specified SOM expression. $host.setFocus() invokes a host method that sets the focus to a specific field or subform. The argument passed to this method is the form node for the field or subform.
As for the previous example, the order of execution of the scripts after this line is undefined. In a non-interactive context the line highlighted in bold has no effect because there is no keyboard focus to set. XFA applications are not required to actually run concurrent events concurrently. The application may queue the events and run them sequentially. However, to ensure the same outcome across concurrent and
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sequential implementations, there is no way to dequeue an event. Once an event is queued it is committed to running to completion.
Rule 5: submit
The order of processing submits relative to click events is not specified. Hence it is not safe to place a submit and a click event script on the same button. Instead, place the script on the preSubmit event.
11
Scripting
This chapter describes the role of scripting objects in templates. It describes how scripting langauges are selected and how their environments must be set up. It also describes exception handling
Purpose of Scripting
It is important to understand that scripting is optional. The template author can take advantage of scripting to provide a richer user experience, but all of the features described so far operate without the use of scripts. Script creation is part of the template authoring process. XFA supports scripting in JavaScript, but it also defines its own script language, FormCalc, which is described in FormCalc Specification on page 902. Often, the scripts attached to a form are similar to those attached to a spread-sheet. FormCalc has been designed as an expression-oriented language, with simple syntax for dealing with groups of values in aggregate operations. Both JavaScript and FormCalc expose the same object model. Scripting almost always works with data values, so these are easily referenced (though you can script against any XFA DOM element present). Indeed, XFA defines a complete Scripting Object Model (XFA-SOM). A key feature of XFA-SOM is that it manages relative references. For example, when defining an invoice detail line the creator of a form sets up fields named unitPrice, quantity and amount. The calculation for amount is simply unitPrice*quantity. The form contains multiple detail records using the same field names, but XFA-SOM automatically manages the scope to select the unitPrice and quantity data that corresponds to the same detail record. It can do this in two ways: by selecting fields that are in the same or related subforms; or by selecting from among multiple fields with the same name within the same subform. For more information about XFA-SOM see About SOM Expressions on page 75. Because of the declarative nature of XFA-Template, the largest use of scripting is for field calculations. A field with such a script typically is protected against data entry, and instead gets its value from an expression involving other fields. A field's calculation automatically fires whenever any field on which it depends changes (those fields may, in turn, also have calculated values dependent on other fields, and so on). See Calculations on page 333. Similar to calculation, a field can have a validation script applied that validates the field's value, possibly against built-in rules, other field values or database look-ups. Validations typically fire before significant user-initiated events (e.g., saving the data). See Validations on page 334. Finally, scripts can be assigned to events, for example, onEnter, onExit, onClick, and so on. See Events on page 340.
358
XFA Specification Chapter 11, Scripting Specifying Where to Execute a Script 359
Desciption Indicates scripts that may be executed only on an XFA processing application set up as a client. Indicates scripts that may be executed only on an XFA processing application set up as a server. Indicates scripts that may be executed on either an XFA processing application set up as either a client or a server.
Caution: For security reasons, the server should discard any template it receives in a submitted XDP package and obtain a fresh copy of the template from a trusted source. The following template fragment includes a calculation that the server executes when the field value changes or when some other event triggers the calculate event on the server.
Server re-calculates and re-validates submissions from the client XFA processing application. Client XFA processing application delegates to the server scripts that it (the client) cannot perform. That is, if the client determines that it cannot run the script, it can submit the form to the server with instructions to execute the event. For example, the XFA plug-in for Acrobat (a client XFA processing application) can change pages without going to the server, but the HTML client cannot. The following template segment supports both types of client applications: See Submitting Data and Other Form Content to a Server on page 386.
For each script in a template, the script language is encoded in the script element by the contentType attribute. The value application/x-formcalc signifies FormCalc. The value application/x-javascript signifies JavaScript. If this attribute is not specified the language defaults to FormCalc. It is entirely permissible to mix scripts of different languages within the same form.
Object References
In XFA scripts, whether in FormCalc or in JavaScript, objects are referenced using XFA-SOM expressions. XFA-SOM has been defined in such a way that simple references can be used directly either in FormCalc or in JavaScript as the name of the object. For example, the following object references are syntactically valid in both FormCalc and JavaScript. Both references refer to the Total field within the Receipt subform of the form that is being processed. The Receipt subform is the root (outermost) subform.
The JavaScript specification places certain restrictions upon the syntax of object names. These restrictions mean that more sophisticated XFA-SOM expressions may not be useable as object names. In these cases it is necessary to dereference an XFA-SOM expression by supplying it as a string to a method at run time. FormCalc can dereference mostXFA-SOM expressions without an explicit method call, however it too does have limitations. For more information about these limitations see Using SOM Expressions in FormCalc on page 93 and Using SOM Expressions in JavaScript on page 94.
In both cases the script returns a Boolean which is True if the node xfa.datasets.data is a dataGroup and is the current record node but False otherwise. The dataWindow.isRecordGroup() method requires an object as its parameter. JavaScripts behavior is a convenience, because simply naming the object is enough to pass it. By contrast coding the same thing in FormCalc requires the use of the ref() built-in-function to prevent the value from being passed, should xfa.datasets.data happen to be a dataValue node.
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Example 11.5 Recommended style for linking events on one object to script acting on another
<field name="SetDefaults" > <ui><button/></ui> </field> <field name="Clear" > <ui><button/></ui> </field> <field name="Item" > <event activity="click" ref="SetDefaults">
<script>$ = "TodaysSpecial"</script> </event> <event activity="click" ref="Clear"> <script>$ = "N/A"</script> </event> </field> <field name="Quantity" > <event activity="click" ref="SetDefaults"> <script>$ = "1"</script> </event> <event activity="click" ref="Clear"> <script>$ = ""</script> </event> </field>
Exception Handling
Exceptions can be thrown during the execution of a script. In general, if the scripting environment doesn't support a feature and this feature is invoked via script, an exception is thrown automatically. Both FormCalc and JavaScript also allow scripts to throw exceptions programmatically, although FormCalc has no method for scripts to catch exceptions. FormCalc and JavaScript respond to exceptions as follows:
FormCalc. The script stops as soon as an exception is thrown. FormCalc exceptions are described in FormCalc Specification on page 902. JavaScript. If an algorithm throws an exception, execution of the algorithm is terminated and no result is returned. The calling algorithms are also terminated, until an algorithm step is reached that explicitly deals with the exception. Once such an algorithm step has been encountered, the exception is no longer considered to have occurred.
XFA processors should display or log a helpful message the first time any particular uncaught exception is thrown by a particular script. Subsequent repetitions of the same exception from the same script within the same session may be silent. Tip: In Acrobat FormCalc error messages are displayed in the standard error pane but JavaScript error messages are displayed in the JavaScript Console. Use Control/J to bring up the JavaScript Debugger, which includes the Console. Exceptions do not affect other scripts. If there is a queue of scripts to be executed, processing continues with the next one in the queue. Exceptions do not prevent subsequent re-execution of the same script. This is important because a script may refer to an object that does not yet exist, causing an exception. Yet the required object may exist later when the script is re-executed.
Unicode Support
FormCalc supports Unicode 3.2 [Unicode-3.2], and JavaScript supports some range of Unicode, depending on the implementation. A conforming implementation of JavaScript interprets characters in conformance with the Unicode Standard, Version 2.1 or later, and ISO/IEC 10646-1 with either UCS-2 or UTF-16 as the adopted encoding form, implementation level 3. If the adopted ISO/IEC 10646-1 subset is not otherwise specified, it is presumed to be the BMP subset, collection 300 [Unicode-2.1]. Caution: An XFA processor and its scripting engine(s) may internally support bytecodes that are not allowed in XML and thus cannot be loaded from or saved to an XML data document. XML 1.0 restricts characters to the following production:
Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]
This restriction applies even to characters expressed as numeric entities, according to "Well-formedness constraint: Legal Character" in [XML1.0]. XML 1.1 [XML1.1] removes this restriction, but XML 1.1 is not widely used and XFA processors are not required to support it. (Acrobat does not.) In addition, XFA expressly forbids the use of character code zero (#x0), as described on page 113.
12
Using Barcodes
Barcodes require specialized knowledge to use. This chapter does not substitute for a barcode textbook. However it does introduce and discuss issues that arise when using barcodes in XFA forms. XFA supports barcodes as first-class features of a form. A barcode field is a normal field in every way except that its data is presented as an appropriately formed set of bars. Depending on the type of barcode the data may also be shown as characters in, over, or under the bars. In addition XFA supports compressing and encrypting the data in barcode fields. Compression and encryption are not appropriate for normal human-readable fields but are appropriate for some types of barcodes. In a barcode the data is presented as a series of bars with varying widths. So-called one-dimensional barcodes have a single line of bars. So-called two-dimensional barcodes have multiple rows of bars. The function of a barcode is to be read by a specialized piece of hardware called a barcode reader. Some barcodes also display the data in human-readable format as a string of glyphs, but this is a secondary function. Since the barcode is intended to be read by a machine its appearance is usually strictly constrained. For example, for a particular type of barcode the bars may have to have to particular height and distance apart. In addition it is common for a barcode to require a minimum amount of white space around it (the quiet zone) and a particular range of distances from a designated edge of the page. There are many different types of barcodes, hundreds in wide use and thousands more in specialized applications. Some types of barcode are specified formally by standards organizations. Others, however, are nothing more than conventions. See the bibliographic appendixBarcode References on page 1237 for references for some barcode types. Note, however, that the barcode bibliography is not authoritative and includes only those barcode types mentioned in the specification and for which references could be identified. Some printers (notably label printers) are capable of printing some barcodes all by themselves. The XFA application driving the printer only has to select the barcode type and supply any necessary parameters, including the data to be encoded in bars. This specification refers to such barcodes as hardware barcodes. In other cases the printer does not handle the barcode. In those cases the XFA application has to tell the printer to draw the barcode a line at a time. This specification refers to such barcodes as software barcodes. Because support for barcodes is a function of both hardware and software, XFA cannot specify a universal set of supported barcodes. Instead XFA supplies a generalized barcode grammar that includes a barcode type identifier and parameters controlling such things as the ratio of thick to thin bar widths. Later sections of this chapter describe those parameters. These parameters cover the needs of all of the common barcode types. However for any particular barcode type some settings are inapplicable. It is normal and expected for templates to contain inapplicable barcode settings; they are silently ignored. Note: XFA does nothing to express or enforce positioning or quiet zone requirements. It is up to the form creator to ensure that these requirements are met. XFA specifies barcode identifiers for some of the most commonly used types of barcodes. XFA applications (in combination with particular printers) that support any of these barcodes recognize the specified barcode type identifier. XFA applications may use custom identifiers to support other types of barcodes. Note: When a specified barcode type is not supported either in hardware or software the result is application-defined.
365
A byte containing the hexadecimal value 82 (decimal 130). A byte containing the value 1. A byte containing the second-least-significant byte of the certificate serial number. A byte containing the least-significant byte of the certificate serial number. A random 16-byte session key encrypted using the algorithm and the public key specified by the certificate. The serialized and optionally compressed data encrypted using the RC4 algorithm and the session key.
Note: RC4 is a copyrighted, proprietary algorithm of RSA Security, Inc. Adobe Systems has licensed this algorithm for use in its Acrobat products. Independent software vendors may be required to license RC4 to develop software that encrypts or decrypts RC4-encrypted barcodes. For further information, visit the RSA Web site at <http://www.rsasecurity.com> or send e-mail to <products@rsasecurity.com>. The chosen encoding, compression, and encryption affect only the printed barcode, not the internal representation of the data or what the user sees when the field has focus in interactive contexts.
Barcode type
The barcode element supplies the information required to display a barcode. This includes the type of the barcode and a set of options which varies from one type of barcode to another. The most important property of the barcode is the type. This is a string controlling what sort of barcode to display. This property must be supplied (there is no approved default). The barcode type determines what properties of the barcode element apply to it. Some properties apply to all or nearly all barcodes. For example the properties described in Data formatting on page 372 apply to most barcodes. By contrast the properties described in Properties of one-dimensional barcodes on page 378 apply to 1D barcodes but not to most 2D barcodes. The sole exception is Type 49, which is a 2D barcode made by stacking 1D barcodes on top of each other. By contrast the properties described in Properties of two-dimensional barcodes on page 382 apply only to 2D bar codes. The set of supported values for the type property is implementation-defined and may also be specific to the display or print device. However a set of values have been defined for this property as indicating particular barcode types. In addition individual XFA processors may implement other values for other barcode types, including custom barcodes. However for any of the defined types that the XFA processor implements it recognizes the defined name. The names are listed below.
aztec
Code 2 of 5 Interleaved, a 1D barcode, as defined in ANSI/AIM BC2-1995, USS Interleaved 2-of-5 [Code2Of5Interleaved].
code2Of5Matrix
Code 2 of 5 Standard, a 1D barcode. Despite the name there is no official standard for this type.
code3Of9
Code 39 (also known as code 3 of 9), a 1D barcode, as defined in ANSI/AIM BC1-1995, USS Code 39 [ Code39].
code3Of9extended
code93
Code 128, a 1D barcode, as defined in ANSI/AIM BC4-1995, ISS Code 128 [Code128-1995].
code128A
Code 128 A, a 1D barcode, as defined in ANSI/AIM BC4-1995, ISS Code 128 [Code128-1995].
code128B
Code 128 B, a 1D barcode, as defined in ANSI/AIM BC4-1995, ISS Code 128 [Code128-1995].
code128C
Code 128 C, a 1D barcode, as defined in ANSI/AIM BC4-1995, ISS Code 128 [Code128-1995].
code128SSCC
Code 128 serial shipping container code, a 1D barcode,as defined in ANSI/AIM BC4-1995, ISS Code 128 [Code128-1995].
dataMatrix
Data Matrix, a 2D barcode, as defined in ANSI/AIM BC11 ISS - Data Matrix, [DataMatrix].
ean8
EAN-13 with Price/Weight customer data, a 1D barcode, as defined in ISO/EEC 15420 [ISO-15420]
ean13add2
United States Postal Service FIM (Facing Identification Mark), a 1D barcode, as described in First-Class Mail [USPS-C100]. Note that the FIM cannot carry arbitrary data because there are just 4 possible bar combinations. The data supplied for the barcode must be one of the strings "A", "B", "C" or "D" for FIM A, FIM B, FIM C, FIM D, respectively.
logmars
Logmars (Logistics Applications of Automated Marking and Reading Symbols), a 1D barcode, as defined by U.S. Military Standard MIL-STD-1189B [LOGMARS].
maxicode
Maxicode, a 2D barcode, as defined in ANSI/AIM BC10-ISS Maxicode [Maxicode]. This is for barcodes that conform to the ANSI/AIM standard, as opposed to upsMaxicode which is for barcodes that conform to UPS usage.
msi
MSI (modified Plessey), a 1D barcode. This may have once had a formal specification for this type but not any longer.
pdf417
PDF417, a 2D barcode, but allowing the data to span multiple PDF417 barcodes. The barcode(s) are marked so that the barcode reader knows when it still has additional barcodes to read, and can if necessary prompt the operator. This facility is defined in "USS PDF417" [PDF417].
plessey
Australian Postal Customer 2, a 1D barcode, as defined in Customer Barcoding Technical Specifications [APO-Barcode].
postAUSCust3
Australian Postal Customer 3, a 1D barcode, as defined in Customer Barcoding Technical Specifications [APO-Barcode].
postAUSReplyPaid
Australian Postal Reply Paid, a 1D barcode, as defined in Customer Barcoding Technical Specifications [APO-Barcode].
postAUSStandard
Australian Postal Standard, a 1D barcode, as defined in Customer Barcoding Technical Specifications [APO-Barcode].
postUKRM4SCC
United Kingdom RM4SCC (Royal Mail 4-State Customer Code), a 1D barcode, as defined in the How to Use Mailsort Guide [RM4SCC].
postUSDPBC
United States Postal Service Delivery Point Bar Code, a 1D barcode, as defined in DMM C840 Barcoding Standards for Letters and Flats [USPS-C840].
postUSStandard
United States Postal Service POSTNET barcode (Zip+4), a 1D barcode, as defined in DMM C840 Barcoding Standards for Letters and Flats [USPS-C840].
postUSZip
United States Postal Service POSTNET barcode (5 digit Zip), a 1D barcode, as defined in DMM C840 Barcoding Standards for Letters and Flats [USPS-C840].
QRCode
Not a barcode at all. The field data is written to an RFID chip embedded in a label. The label printer must be equipped with an RFID programmer. The containing field should have a presence property of hidden so it does not take up space in the layout.
rss14
UCC/EAN 128, a 1D barcode, as defined in International Symbology Specification - Code 128 (1999) [Code128-1999].
ucc128random
UCC/EAN 128 Random Weight, a 1D barcode, as defined in International Symbology Specification - Code 128 (1999) [Code128-1999].
ucc128sscc
UCC/EAN 128 serial shipping container code (SSCC), a 1D barcode, as defined in International Symbology Specification - Code 128 (1999) [Code128-1999].
upcA
UPC-A with Price/Weight customer data, a 1D barcode, as defined in ISO/EEC 15420 [ISO-15420].
upcE
UPS Maxicode, a 2D barcode, as used by United Parcel Service. This is similar to the standard defined in ANSI/AIM BC10-ISS Maxicode [Maxicode] but enforces particular combinations of data formatting, compression, and error correction. See The upsMode property on page 383 for more information.
Data formatting
There are a number of properties which govern how the data will be processed before it is written out to the barcode. This processing does not affect the content of the field in the DOM, only the data carried by the barcode. The individual properties are described below. For any particular barcode type only some of these properties may apply. For example the standard for a particular barcode may dictate the character encoding, in which case the charEncoding property is ignored by the XFA processor.
The characters are encoded using Unicode code points as defined by [Unicode-3.2], and UTF-8 serialization as defined by ISO/IEC 10646 [ISO-10646]. There is no byte order mark.
none
No special encoding is specified. The characters are encoded using the ambient encoding for the operating system.
ISO-8859-1
The characters are encoded using ISO-8859-1 [ISO-8859-1], also known as Latin-1.
ISO-8859-2
The characters are encoded using JIS X 0208, more commonly known as Shift-JIS [Shift-JIS]. This is commonly used for QR Code barcodes.
KSC-5601
The characters are encoded using the Code for Information Interchange (Hangul and Hanja) [KSC5601].
Big-Five
The characters are encoded using Traditional Chinese (Big-Five). Note: there is no official standard for Big-Five and several variants are in use. XFA uses the variant implemented by Microsoft as code page 950 [Code-Page-950].
GB-2312
The characters are encoded using Unicode code points as defined by [Unicode-3.2], and UTF-16 serialization as defined by ISO/IEC 10646 [ISO-10646]. There is no byte order mark.
UCS-2
The characters are encoded using Unicode code points as defined by [Unicode 3.2], and UCS-2 serialization as defined by ISO/IEC 10646 [ISO-10646]. There is no byte order mark.
fontSpecific
The characters are encoded in a font-specific way. Each character is represented by one 8-bit byte. The font referred to is font property of the enclosing field.
Write out a header consisting of a byte with decimal value 129 (0x81 hex) followed by another byte with decimal value 1. Then write the data compressed using the Flate algorithm, as defined by the Internet Engineering Task Force (IETF) in [ RFC 1951]. No predictor algorithm is used. It is an error to specify this option with a type that cannot encode arbitrary binary data. Note: The value flateCompress is recommended for use with 2D barcodes only but this specification does not forbid its use with 1D barcodes.
This property is ignored by the XFA processor if the barcode type does not allow it.
Insert a "1 modulo 10" checksum followed by a "1 modulo 11" checksum. "1 modulo 10", "2 modulo 10", and "1 modulo 11" are defined in barcode standards documents for the barcodes to which they apply.
Legends
Some barcodes support the printing of the text in the barcode inside, above, or below the barcode itself. The following properties are defined to control the printing of legends. These properties are ignored when the barcode is of a type that does not allow a legend. The region available for embedded text, if any, is determined by the barcode format. For most barcode formats it is a single contiguous region, but for EAN series barcodes it is split up into four separate regions. The typeface and size are inherited from the enclosing field. The template must specify a typeface and size for the field that will fit into the provided space without overlapping any bars. The typeface should be non-proportional. The XFA application centers the text in the provided space. If the data in the barcode is encrypted or compressed the legend, if any, is the compressed and/or encrypted text. For any particular barcode type only some of these properties may apply. For example the standard for a particular barcode may permit the legend to lie above or below the barcode but not to be embedded in it. See Which 1D properties apply to which type on page 380 for more information. Legends are controlled by the following properties, where applicable.
Text is partially embedded in the bottom of the barcode. The baseline of the text is aligned with the bottom of the bars.
aboveEmbedded
Text is partially embedded at the top of the barcode. The top of the text is aligned with the top of the bars.
none
No text is displayed. When the specification for the barcode type requires the legend to be in one particular place, or forbids the display of a legend, this property is ignored. If the template specifies belowEmbedded and there is no embedded text region at the bottom of the barcode, the XFA processor may interpret the property as below. Similarly if the template specifies aboveEmbedded and there is no embedded text region at the bottom of the barcode, the XFA processor may interpret the property as above. Otherwise it is an error for the template to specify a location that is not supported by the type of barcode.
Do not print the check digit in the human-readable text, only in the barcode itself. This is the default.
1
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Maximum
Maximum
Minimum
Minimum
Start Char
End Char
0.191
1.25
2.2
3.0
x x x x
x x
5 5 5 5
3.0 x x x x x x x
x x x x x x
1.25 1.25
x x
x x x x x x x 9 5 11 8 x x
380
Data Length
Maximum
Maximum
Minimum
Minimum
Start Char
End Char
Fixed 0.125 0.125 0.125 0.125 0.125 0.125 0.125 0.125 0.125 Fixed 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25
Fixed 0.125 0.125 0.125 0.125 0.125 0.125 0.125 0.125 0.125 Fixed
Fixed 2.0 2.0 2.0 Fixed Fixed Fixed Fixed Fixed 2.0 Fixed 3.0 3.0 3.0 3.0
x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x 1 x x x x x 10 2 5 x x
XFA Specification
14
x x x
Properties of one-dimensional barcodes 381
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The data is for a carrier in the United States of America. The data includes a numeric postal code up to 9 digits in length and other information. This is known in UPS documentation as Mode 2. This is the default.
internationalCarrier
The data is for a carrier outside of the United States of America. The data includes an alphanumeric postal code up to 6 characters in length and other information. This is known in UPS documentation as Mode 3.
standardSymbol
The data is non-shipping encoded information. This mode is limited to about 90 characters of user data. This is known in UPS documentation as mode 4.
secureSymbol
The data is non-shipping encoded information with more error correction than standardSymbol affords. This mode is limited to about 74 characters of user data. This is known in UPS documentation as mode 5.
The module size is variable within limits but height and width must be equal. The number of rows and columns is variable but the two numbers must be equal.
code49
The ratio of wide bar width to narrow bar width is fixed. The selection of error correction level varies with the number of rows and columns and is not user-settable.
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dataMatrix
The module size overall dimensions of the barcode are fixed. The error correction level is variable, but older levels are deprecated. XFA processors default to ECC-200.
maxicode
The module size is variable within limits. Height in rows and width in columns are variable within limits.
QRCode
The module size and overall dimensions of the bar code are fixed. There are two error correction levels but the level known as Model 1 is deprecated. XFA processors default to Model 2.
upsMaxicode
The module size and overall barcode dimensions are fixed. One of four modes is selected by the upsMode property. Each mode fully specifies the encoding and error correction level. XFA processors ignore or override properties which are outside the limitations of the particular barcode. For instance, when printing a QRCode barcode the size and shape of the barcode is fixed. By contrast when printing a PDF417 barcode the XFA processor ajusts the barcode to fit within the field width and height, but only within the allowed limits for a PDF417 barcode. Individual XFA processors may ignore or override other properties. This is inevitable because hardware barcodes may have different limitations on different printers.
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13
Annotating an existing resource Posting a message to a bulletin board, newsgroup, mailing list, or similar group of articles Providing a block of data, such as the result of submitting a form, to a data-handling process Extending a database through an append operation
386
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About
Content submission is specified using an event object that specifies the submit property as the action to perform when the event is activated. (See also the syntax description for the submit element.) The object that describes content submission may be a property of any type of event; however, it is typically associated with a click event that has a button appearance, as shown in the following example. Users would click such a button to indicate they have finished filling out the form and wish to submit it for processing. Before the content submission is allowed to progress, the form data must be successfully validated and other scripts must successfully execute. Typically, if the validation or scripts fail, users are asked to make corrections and resubmit the form. When the processing application successfully submits the form content, the form is said to be committed. That is, the content is in a final form.
In the above example the domain part of the target URI is "http:", which indicates that the submission is to be performed via an HTTP POST operation. If the domain was "mailto:" then the submission would take place via e-mail. Submitting a form and saving a form are similar in that they convert the Template/Form/Data DOM into an XML or PDF representation, but they differ in the level of checking done. Saving a form does not involve any validation or other checks because users may save forms at various stages of completion. Users do not expect to see error reports and warnings during such saves.
Content Interchange
The submit syntax is intended to support most XML-based content interchanges. It does so by specifying what types of content are submitted to the server, how content should be packaged (format, embedPDF and xdpContent) and how the content should be encoded (textEncoding). Starting with XFA 2.5 it also specifies what signatures should be applied (signData) and what encryption should be used (encrypt). The behavior of a submit element differs depending on other properties in the submitting event. That is, submission may invoke any of the following behaviors:
Client submits the specified content to the server. The server executes scripts flagged for execution on the server or on both the server and the client. Client submits the specified content with the expectation that the server will perform the script and return a result. The server performs the script and returns the result in its response to the HTTP POST.
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The factors that influence submission behavior include the following: Factor Event trigger Explanation Submission may differ for an event triggered by user interaction, as opposed to an event activated by some other trigger. User-triggered events include: enter, exit, mouseEnter, mouseExit, change, click, mouseUp, and mouseDown. Submission may differ, depending on whether a script is included in the event and on the value of the scripts runAt attribute. The runAt attribute specifies where the script should be executed.
Script
The following table describes shows how the above factors affect submission behavior. This table applies only to events that include submit elements.
Client tasks
Server tasks
Post data to server with an indication of the triggered event. When data returned from server, remerge it into form and display results. See Client Submit Event That Processes Data at the Server on page 391. If the client successfully executes the script, the client does not post data to the server. This approach is taken to avoid a flood of unintentional interactions between the client and server.
Binding data to form, activate indicate event, and return data to client. The data is returned in the HTTP POST response. Binding data to form, activate indicate event, and return data to client. The data is returned in the HTTP POST response.
runAt="both"
See Client Programatically If the client cannot to process the Submits a Request to the script, the XFA processing application Server on page 392. may chose to invoke the submit element to elicit the same behavior as described for runAt="server". no script provided Submit data to server, with an (but event contains a indication that a preSubmit event has occurred. The client has no submit element) expectation that data will be returned. See Client Submit Event That Does Not Expect Returned Data on page 389.
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runAt="both"
Submit data to server, with an no script provided (but event contains a indication that a preSubmit event has occurred. The client has no submit element) expectation that data will be returned.
The following sections discuss how the submit syntax supports various form-oriented workflows.
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7. Apply, clear, or validate signatures on the data and other content as specified by all signData children of the controlling submit element. This step was new in XFA 2.5. 8. Encrypt the signature, data and other content as specified by the encrypt child of the controlling submit element. This step was new in XFA 2.5. 9. Send the data to the server using the HTTP post operation. If the form contains any preSubmit events with scripts having a runAt attribute set to server or both, the client includes in the data special instructions. These special instructions tell the server which preSubmit events it (the server) should immediately process. The format of such special instructions is implementation-defined. The response to an HTTP POST failure is implementation-defined. Server. The server XFA processing application typically performs the following steps after it receives the data: Caution: For security reasons, the server should discard any template submitted in the XDP package and obtain a fresh copy of the template from a trusted source. 1. Decrypt the HTTP POST data if it is encrypted. 2. Validate the signature if one is required. 3. Create the Form DOM. 4. Examine the data for special instructions that indicate preSubmit events. If such instructions are found, examine the events they indicate for scripts that contain a runAt attribute set to server or both. If such scripts are found, execute them. 5. Execute all calculation scripts that contain a runAt attribute set to server or both. 6. Execute all validation scripts that contain a runAt attribute set to server or both. 7. Execute the scripts in any events activated as part of submit processing, provided those scripts contain a runAt attribute set to server or both and provided they do not contain submit elements.
Example 13.2 An event that does not expect data to be returned from the server
<field name="Button1" > <event activity="click"> <submit target="mailto:me@example.org" textEncoding="UTF-8" xdpContent="datasets template"/> </event> </field> <field name="NumericField1" > <value> <float>100</float> </value> </caption> <event activity="preSubmit" ref="$form"> <script runAt="server">valueA * valueB</script> </event> </field> <field name="valueA" > <value> <float/>
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Client-side actions
The client XFA processing application performs the following steps when a submit event is activated. The submitting event requests data be processed and returned. (See the table Factors That Influence Submission Behavior on page 388). 1. Package the data and any other content, as specified in the submit properties format, embedPDF and xdpContent. (Content Interchange on page 387) 2. Sign the data and other content as specified by the signData child of the controlling submit element. This step was new in XFA 2.5. 3. Encrypt the signature, data and other content as specified by the encrypt child of the controlling submit element. This step was new in XFA 2.5. 4. Include in the package an indication of the event initiating the submission. The format of this is implementation-defined. 5. Send the data to the server using the HTTP POST operation. 6. When the HTTP POST operation returns (Step 5. below), merge the returned data into the Data DOM. For more information on the HTTP POST interchange, see [HTTP]. The response to an HTTP POST failure is implementation-defined.
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This facility is especially useful when the client may not support a needed function, as shown in the following example.
Example 13.4 Script falls back to carrying out the pageDown() action on the host
<field name="pagedown" > <event activity="click"> <script runAt="both" contentType="application/x-javascript"> system == xfa.host.pageDown(); </script> <submit format="xdp" target="http://www.example.org" textEncoding="UTF-16" xdpContent="datasets"/> </event> </field>
Because the script has runAt="both" it would not normally be submitted to a server even though the event contains a submit element. However the script tries to process the pageDown() method on the current XFA processor and, if that fails, programmatically submits the request to the host. JavaScript is used rather than FormCalc because JavaScript provides convenient facilities for catching runtime errors. A template that contained the above example would elicit different results, depending on the capabilities of the application processing it, as described below:
Acrobat with XFA plug-in. This XFA processing application implements the pageDown() method. As a result, if the user clicks on the field named pagedown, the script command to page down is successful. Adobe XFA HTML client. This XFA processing application does not implement the pageDown() method. As a result, if the user clicks on the field named pagedown, JavaScript detects an error event (onerror). The JavaScript error event invokes the submit element, which causes the XFA HTML client to send the script to the server for execution and then to merge the returned result.
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Fields and exclusion groups can act as either senders of data to a particular web service, receivers of data from the web service, or both. A field or exclusion group is not limited to a single Web Service. Instead it has the ability to interact with different web services at different times. Data may be coerced into a web service's input message schema, as defined by a provided data description. The coercion is done in a separate DOM (the Connection Data DOM) so it does not affect the regular Data DOM. The root node for the Connection Data DOM is xfa.datasets.connectionData (also known as!connectionData). Scripts in the template may inspect and modify the data while it is in the Connection Data DOM. Data returned from the web service is retained in the Connection Data DOM in its own schema. Scripts in the template may inspect and modify data returned from a web service while it is retained in the connection DOM. Data from a web service may be imported into the existing Form DOM, or used to create a new Form DOM. In this version, XFA supports only web services that implement doc-literal SOAP operations over HTTP. This means that the Web Service's WSDL must define a SOAP binding, operations with document style, and messages with literal encoding. These terms are defined in Web Services Description Language (WSDL) 1.1 [WSDL1.1]. RPC (Remote Procedure Call)-style operations are not supported by this version of XFA. Also encoded messages are not supported by XFA, even though [WSDL1.1] permits their use with document style operations.
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2. The XFA application marshals the complete SOAP message in the Connection Data DOM. The schema for the message comes from the data description named by the connection's dataDescription property. The message includes data from all subforms, fields, and exclusion groups that are linked to the connection by their connect children. Each connect child supplies a pointer mapping to a node in the message where its parent's data is copied. 3. The preExecute event is triggered. If there is a script associated with it, the script has a chance to examine and modify the message in the Connection Data DOM. For example, the script may add additional SOAP headers. 4. The XFA application serializes the message in the Connection Data DOM to XML and constructs the input message for the service. 5. The XFA application sends the input message to the server. 6. The server performs the operation. 7. The server sends a reply to the XFA application. The reply may include an output message. 8. If the operation has an output message, it contains data serialized as XML. The XFA application loads the data from the received message into the Connection Data DOM, replacing the input message that was there previously. 9. The postExecute event is triggered. If there is an associated script, it runs. While the script is running$event.soapFaultCode and$event.soapFaultString are set to the received fault code and fault string. These are contained in the soap:faultcode and soap:faultstring elements, respectively, inside the soap:fault element. If the operation succeeded, there is no soap:fault element and both event properties default to the empty string (). The script can detect success by checking for an empty string in $event.soapFaultCode. The script can also inspect and modify the received data in the Connection Data DOM before it is imported into the Form DOM. For example, it may check for headers. 10. The XFA application imports the received data into the Form DOM. There are two ways the XFA processor can carry out the importation. When the executeType property of the event object is set to import, it simply updates the data that is bound to the output of the connection. This is simple and efficient but it does not support dynamic subforms, which are inserted into the form where required and/or as often as required by the data. For dynamic subforms the XFA processor clears the Form DOM and rebuilds it using a merge (data binding) operation. This is done when the executeType property of the event object is set to import. Note: The merge operation is modified when there is a connection active. As the XFA processor builds the Form DOM, when it comes to a candidate field or exclusion group associated with the current connection, it reaches into the Connection Data DOM and plucks the associated data (if any) from there. If the field or exclusion group was already bound to data in the Data DOM, the new data propagates through to the Data DOM, updating the node that is already there; otherwise a new data node is created to hold the data. 11. The message in the Connection Data DOM is deleted.
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The data description for a web service is a special case. The data description must declare the schema for the input message (from client to server). In addition it must declare the name of the web service connection which will be referenced in connect elements in the template. This is done using the following structure:
<dd:dataDescription xmlns:dd="http://ns.adobe.com/data-description/" dd:name="dataDescriptionName"> <connectionName> <soap:Header xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> ... data description for header ... </soap:Header> <soap:Body xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> ... data description for message ... </soap:Body> </connectionName> </dd:dataDescription>
Note: There can only be one connectionName element per data description. Note also that the connectionName element's namespace is ignored. For example, the following data description declares the message schema to use with a web service connection called POConnection.
In the above example, the soap:Body element contains the schema for the message. The optional soap:Header element has been omitted.
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54 <soap:body use="literal"/> 55 </output> 56 </operation> 57 </binding> 58 59 <service name="StockQuoteService"> 60 <documentation>My first service</documentation> 61 <port name="StockQuotePort" 62 binding="tns:StockQuoteBinding"> 63 <soap:address 64 location="http://example.com/stockquote"/> 65 </port> 66 </service> 67 68 </definitions>
This definition file tells potential clients how to access the service. The following table describes the definition files parts. For more information about the meaning of WSDL definition files see [WSDL1.1]. Line # Element name 8 types 28 message 32 message 36 portType 43 binding Defines XML components used in the other sections Input message Output message Operations and how they use messages Binding between the messages and the SOAP protocol (GetLastTradePriceInput as the input message and GetLastTradePriceOutput as the output message) URL of the server and the name of the service (port)
59 service
Output message provides trading price (if successful) or a status indicator (if not successful)
If the query succeeds (that is, if a share quotation can be obtained for the given ticker symbol), the output message from the server carries the price per share for the requested corporation. It has the following form:
<soap:Body xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
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Note: This is not an XFA-specified schema. It is specified by the web service. If the query fails (for example because there is no known listing for the given ticker symbol), the output message carries a status indicator. It has the following general form (with whitespace added for clarity):
<soap:Body xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> <soap:Fault> <faultcode>...</faultcode> <faultstring>...</faultstring> </soap:Fault> </soap:Body>
The soap:Fault element can also contain a faultactor element but this is uncommon. Note: This is not an XFA-specified schema. It is specified by the web service.
Definition file may define multiple individual operations, each using a different connection set
The service defined by this definition file can include many individual operations. However a wsdlConnection element describes just one operation. Hence it may require many wsdlConnection elements to fully describe a service. The simple service in this example supports a single operation, so in this case only one wsdlConnection element is needed.
The wsdlConnection element has attributes (below) that link it to other parts of the XDP.
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dataDescription attribute points to a data description that must be created (Data Description Specification). name attribute supplies a name for this connection that is used in connect elements to indicate that the content of a field, exclusion group, or subform takes part in the transaction (Connection Set Specification).
The wsdlAddress child of the wsdlConnection element contains the URL of the WSDL service definition. This is optional information for the use of form creation tools. In this case, its location happens to be the same as its namespace, but it could be anywhere. The soapAction child of wsdlConnection is copied from the soapAction attribute of the soap:operation element in the WSDL definition file. In this case soapAction is empty because in the WSDL definition file the value of the attribute is the null string. Similarly, the soapAddress child of wsdlConnection is copied from the location attribute of the soap:address element in the WSDL definition file. The operation child of wsdlConnection associates the names used within the XDP to the operation(s) and messages defined in the WSDL definition. Here, the service exposes one operation, identified by the string "TradePriceRequest". This is the content of the operation element. The input and output attributes identify the element definitions for the input and output messages, respectively, in the WSDL definition. Note that in a WSDL file several operations with the same name can exist. This is analogous to function overloading. In this case, the input and output attributes uniquely identify the selected operation. If the input or output element in the WSDL file does not have a name attribute, the attributes must be set to the default input or output name as specified in [WSDL1.1] Section 2.4.5. The associated data description controls the format of the message sent by the XFA application to the web server. This message includes the input message defined by the WSDL description and a [SOAP 1.1] envelope around it.
This data description matches the input message GetLastTradePriceInput from the WSDL service description. Note that the data description merely describes the message format. It does not define the binding of data in the Data DOM to the message. This binding is performed by the individual connect children of fields, exclusion groups, and/or subforms in the Form DOM. This data description does not include a schema for the output message. This is not required because XFA does not need a schema to import data.
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Associating Fields and Exclusion Groups with Nodes in the Connection Data DOM
Fields and exclusion groups can have connect children that associate them with particular nodes in the Connection Data DOM. The connect children control the movement of data between the Data DOM and the Connection Data DOM, in either or both directions. Each connect child controls only that particular data value which is bound to its parent. In the example there are two wrapper subforms involved in data transfer. The subform input and its contents provide the input message, while output and its contents display the output message. The section of the template containing input is reproduced below.
For each connect element, the connection attribute identifies a wsdlConnection in the connectionSet. The connect element has no effect except when the XFA processor is exchanging data with the service represented by that particular connection. The ref attribute is a modified SOM expression that identifies the location of the node in the Connection Data DOM corresponding to the subform, field, or exclusion group. Note that ref must point to a node inside the Connection Data DOM. When the SOM expression is fully qualified, it is a standard SOM expression. Hence, in the example, the contents of the field are mapped to the node xfa.datasets.connectionData.TradePriceWS.Body.TradePriceRequest.tickerSymbol, which is in the Connection Data DOM. The name Body in this SOM expression refers to a SOAP element that contains the message to be sent inside the SOAP envelope. When the SOM expression is relative, the base location ($) is inherited from the connect child of the enclosing container, instead of being the location in the Form DOM of the container that asserts the SOM expression. Consider the following modified template fragment for input.
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Example 13.10 Previous example modified to take advantage of connect-relative SOM resolution
<subform name="input" ...> <connect connection="TradePriceWS" ref="!connectionData.TradePriceWS.Body" usage="exportOnly"/> <subform name="query"> <connect connection="TradePriceWS" ref="TradePriceRequest" usage="exportOnly"/> <field name="stockTickerSymbol" ...> ... <connect connection="TradePriceWS" ref="tickerSymbol" usage="exportOnly"/> </field> ... </subform> ... </subform>
In this example, the input subform has a ref property asserting a fully-qualified SOM expression !connectionData.TradePriceWS.Body . Because this is fully-qualified it does not matter what value of $, if any, it inherits from its parent. The expression resolves to xfa.datasets.connectionData.TradePriceWS.Body. Its child subform TradePriceRequest inherits the node xfa.datasets.connectionData.TradePriceWS.Body as its base location. The TradePriceRequest subform in turn has a connect.ref asserting a relative SOM expression, TradePriceRequest. This combines with the inherited base, resolving to xfa.datasets.connectionData.TradePriceWS.Body.TradePriceRequest. This resolved node in turn becomes the base location inherited by the field stockTickerSymbol, which is the child of input. The field has a connect.ref asserting the relative SOM expression tickerSymbol. This combines with the inherited base to resolve into xfa.datasets.connectionData.TradePriceWS.Body.TradePriceRequest.tickerSymbol. Hence, the effect is the same as the earlier syntax. The inheritance mechanism has an important advantage when dealing with arrays of data (sets of sibling data nodes sharing the same name). The rules for resolving SOM expressions allow the expression to leave out some subscripts. When the subscript is omitted from an unqualified reference, the XFA processor uses the subscript of the container in the Form DOM that is asserting the SOM expression. (Or it may use the subscript of an ancestor. See Inferred Index for Ancestors of the Container on page 104. This makes it possible to use dynamic subforms. Such a subform is declared just once in the template but allowed to instantiate multiple times in the Form DOM. Using an unqualified SOM expression, each of its instantiations correctly references the data, even though each instantiation uses the same SOM expression. Index inferral does not apply to fully-qualified SOM expressions. The inheritance mechanism makes it possible to use unqualified SOM expressions and thus to take advantage of index inferral.
Data Conditionally Copied Between the Data DOM and the Connection Data DOM
The usage attribute controls whether data is copied from the Data DOM to the Connection Data DOM (exportOnly), from the Connection Data DOM to the Data DOM (importOnly), or both ways (exportImport). The effect of copying data both ways with exportImport is to update the data. This is
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not required for the example application. Hence, in the example fragments, the field associated with the input message has a connect.usage of exportOnly. After the message is marshalled in the Connection Data DOM, but before it is sent, the preExecute event triggers. A script activated by preExecute can modify the input message before it is sent. It is also acceptable for a preExecute script to programmatically copy data out of the Connection Data DOM. For example, the following fragment shows some debug code in a test template.
In the example, when the preExecute script is invoked, the Connection Data DOM contains:
[dataGroup (soap:Body) xmlns="http://schemas.xmlsoap.org/soap/envelope/"] [dataGroup (tns:TradePriceRequest) xmlns="http://example.com/stockquote.wsdl"] [dataValue (tns:tickerSymbol) = "stockTickerSymbol" xmlns="http://example.com/stockquote.wsdl"]
This is exactly equivalent to the input message shown above. The mapping between XML and objects in the Connection Data DOM is the same as the default mapping rules used in the regular Data DOM, as described in Default Data Mapping Rules on page 118.
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$event.soapFaultString are both empty strings (). Note that the event properties $event.soapFaultCode and $event.soapFaultString are only available for the duration of the postExecute event, hence only to scripts activated by the postExecute event. The following fragment illustrates how a script can check for the failure of the query.
When the service request fails, the return message may include a faultactor element. This element is not used by the stock quote service and in fact is rarely used. Even when faultactor is used, the XFA processor does not copy the content of faultactor into $event. However the postExecute script can get its contents directly from the Connection Data DOM. It is also acceptable for a postExecute script to programmatically copy data out of the Connection Data DOM. For example, the following fragment shows some debug code in a test template.
Example 13.13 Script executing on postExecute copies data out of the Connection Data DOM
<field name="POSTEXECUTE" ...> ... </field> <field name="FAULTSTRING" ...> ... </field> <field name="FAULTCODE" ...> ... </field> <event activity="postExecute" ref="$connectionSet.TradePriceWS"> <script> POSTEXECUTE = !connectionData.TradePriceWS.saveXML(); FAULTCODE = $event.soapFaultCode; FAULTSTRING = $event.soapFaultString; </script> </event>
After the postExecute script finishes the XFA processor resets the $eventobject, so $event.soapFaultCode and $event.soapFaultString are no longer available. At this point if a soap:Fault element was returned the XFA processor clears the Connection Data DOM and the transaction is finished. However if no soap:Fault element was received the XFA processor proceeds to import the received data from the Connection Data DOM into the main Data DOM. Note that this version of XFA does not define any way for the postExecute script to prevent the import from
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happening. However the script can delete all nodes from the Connection Data DOM, which has much the same effect. The usage attribute of each connect element controls whether the associated data is copied from the Data DOM to the Connection Data DOM (exportOnly), from the Connection Data DOM to the Data DOM (importOnly), or both ways (exportImport). Note that the same node in the Connection Data DOM can receive exported data from one node in the Data DOM while supplying imported data to another node in the Data DOM, using one connect.usage set to exportOnly and another set to importOnly. This is not necessary for the example template because the web service uses a separate element for the data returned by the query. The section of the template that imports the returned data is.
After the data has been copied from the Connection Data DOM to the Form DOM and Data DOM the transaction is complete. At this point the XFA processor clears the Connection Data DOM. This prevents any possible interference between consecutive web service transactions and simplifies security analysis. One thing remains to be arranged. There must be some way to trigger the data exchange with the web service. This can be done using an execute child of event, as follows.
The field getQuoteBtn is a button. When the user clicks on the button, the XFA processor initiates the web service transaction. The execute element has a runAt property which specifies whether the transaction is to be initiated on the XFA client, on the XFA server, or both. Note that the XFA server is in no way related to the web service server. The XFA server is the computer that served the template to the XFA client. The web service server may be located somewhere else and have no knowledge of XFA. Hence, runAt does not affect the web
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service server. Rather it determines whether the XFA client, the XFA server, or both, may act as a client to the web service server. The execute element also has an executeType property. This can take the values import and re-merge. When the value is imported, the XFA processor updates the existing nodes in the Form DOM and Data DOM with the values from the Connection Data DOM. However if the value is re-merged, the existing nodes are not updated in place. Instead the Form DOM is cleared and a fresh merge operation is performed between the Template DOM and both the Connection Data DOM and the Data DOM. In this merge operation, as the template is traversed, candidate data for binding is sought not only in the Data DOM but also in the Connection Data DOM. If suitable data is found in the Connection Data DOM, it is appended to the Data DOM. The result is that, if data from the Connection Data DOM can be appended the Data DOM and bound to the Form DOM, it is. But any data in the Connection Data DOM that does not match suitable template structure remains un-copied and is lost when the Connection Data DOM is cleared. The re-merge operation has the advantage that the output message can include dynamic structure (optional elements or variable numbers of occurrences of elements) and the form adapts just as it would to dynamic structure in an ordinary data document. However many web services produce output messages with static structures which are more efficiently processed using import.
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Example 13.18 Source set packet for the customer contact example
<sourceSet xmlns="http://www.xfa.org/schema/xfa-source-set/1.0/"> <source name="FFADOData1" db="customer"> <connect> <connectString>DSN=NoPasswordTest</connectString> <user/> <password/> </connect> <command timeout="30"> <query> <recordSet cursorType="static" cursorLocation="client" lockType="optimistic" max="0" bofAction="moveFirst" eofAction="moveLast"/> <select>Contacts</select> <map from="FirstName" bind="#bind0"/> <map from="LastName" bind="#bind1"/> </query> </command> <bind id="bind0" ref="$record.contact.FirstName"/> <bind id="bind1" ref="$record.contact.LastName"/> </source> </sourceSet>
The elements that make up the source set packet are discussed individually below. They are discussed in the order in which they occur in this example. See Source Set Specification on page 854.
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Example 13.19 The recordSet element from the customer contact example
<recordSet cursorType="static" cursorLocation="client" lockType="optimistic" max="0" bofAction="moveFirst" eofAction="moveLast"/>
The cursorType property causes a a static cursor to be used, which grabs a copy of the record set and does not respond to subsequent changes by other users. Furthermore, updates to the record set are not committed to the data base automatically. They are committed only when the update method of the recordSet object is invoked. The cursorLocation property here causes the cursor to be located on the client. Where the cursor is located affects the efficiency and responsiveness of the interaction. In this case, because the cursor type is static, it is desirable to maintain the cursor on the client. The lockType property governs locking of the data in the database while the client has the record set open. The optimum value for this is determined by the data base design, the cursor type, and the nature of the application. The max property sets a limit for the number of records to be returned in the record set. When the value is zero, as in the example, there is no limit. The bofAction and eofAction properties control what the cursor does when a cursor positioning command places the cursor at the beginning or end, respectively, of the record set. Using bofAction and eofAction the form can auto-insert a new record at the end, pre-position for insertion at the beginning, and so on. With all these options available it is possible to make a form that accesses a database with a minimum of scripting. Indeed in the example all of the scripts associated with each button are single method invocations.
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For each data item two bindings are necessary, one from the data base into the XFA Data DOM and another from a field into the same node of the Data DOM. The binding of fields to nodes in the Data DOM is controlled by the template, as shown in Fields bound to columns in the data base on page 411.
Example 13.21 Fields bound to database columns for the customer contact example
<field > <value> <text/> </value> <ui> <textEdit/> </ui> <bind match="dataRef" ref="$record.contact.FirstName"/> </field> <field > <value> <text/> </value> <ui> <textEdit/> </ui> <bind match="dataRef" ref="$record.contact.LastName"/> </field>
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When the button in the example is pressed it deletes the current record from the record set. FFADOData1 is the name of the source object which controls the query. The table below shows all of the buttons in the form. Each of them simply invokes a method of the controlling source object. None of these methods require parameters, because the parameters are supplied by the source set document. Function Performed by Button Make a connection, select a set of records, and create a cursor for that record set. Rewind to the beginning of the record set. Move backward one record in the record set. Move forward one record in the record set. Fast forward to the end of the record set. Delete the current record in the record set. Update the current record from the data in the form (which presumably has been edited by the user). Reload the current record from the data base. Close the connection to the data base and free the cursor. If updates have been made but not committed with updateBatch() they are thrown away. Post updated records from the record set to the data base. This commits the changes made via previous calls to the update() method. Roll back changes made via previous calls to the update() method. Repeat the query, regenerating the record set. Insert a new record into the record set at the current position, shifting the current and subsequent records down one. Cancel changes made to the data representing the current row, prior to an invocation of the update() method. Script associated with button
$sourceSet.FFADOData1.open() $sourceSet.FFADOData1.first() $sourceSet.FFADOData1.previous() $sourceSet.FFADOData1.next() $sourceSet.FFADOData1.last() $sourceSet.FFADOData1.delete() $sourceSet.FFADOData1.update() $sourceSet.FFADOData1.resync() $sourceSet.FFADOData1.close()
$sourceSet.FFADOData1.updateBatch()
$sourceSet.FFADOData1.cancel()
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Updating the contents of the current row in the Data DOM by assigning to the data values or by editing associated fields via the UI. This can be cancelled by the cancel() method. Updating the contents of the current row in the data set using the update() method. Multiple rows can be updated this way, one at a time. This can be cancelled by the cancelBatch() method. Updating the contents of the data base using the updateBatch() method. This commits the changes to the data base.
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Causes the signature of the data to be verified. If the verification fails, the submission process is canceled and the XFA processor issues a message indicating why the submission failed. This operation is performed before any signature is added or cleared.
clear
Causes the signature, if it exists, to be removed from the data. This operation is performed before any signature is created.
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sign
Adds a signature to the data. The encrypt object has a format property that selects the type of envelope to be used, a PDF envelope or an XML envelope. If PDF is selected the data is inserted as an attachment into an encrypted PDF file. If XML is selected the data is encrypted using W3C XML encryption [XMLEncryption] and placed inside an XML wrapper. Note: Acrobat does not support the use of XML encryption or an XML wrapper. It is limited to inserting the data as an attachment inside an encrypted PDF file. The wrapper with the encrypted, signed data inside is sent as an attachment to an e-mail message. The addressee of the e-mail (the To: field) is the submit URI with mailto: domain name stripped from the beginning. In an interactive environment the user may be given the option to edit the subject line, the body text, or other aspects of the message before sending it.
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Null handling
XFA supports the use of the xsi:nil attribute to explicitly mark an element as containing or not containing null data. This is an extension of the notation defined in [XMLSchema]. The use of xsi:nil in XFA is described in Data Values Representing Null Data on page 126.
14
User Experience
This chapter describes the appearance and behavior or template user interface (UI) objects. It also provides guidance on using such objects to provide accessibility.
Widgets
This section describes the general appearance and behavior of the widgets specified by forms that interface with a user. As described in Size, Margins and Borders of Widgets on page 50, a widget refers to a simulated mechanism displayed by the user interface to enable the user to enter or alter data. For example, a check box displayed on a monitor, which checks or unchecks in response to a mouse click, is a widget. If a field omits a widget, the XFA processing application selects a widget for the field, as follows:
Field has data. If the field includes default data or if the field is bound to data, the XFA processing application assigns a widget that reflects the type of data. Field is empty. If the field contains neither a default value nor is bound to data, the XFA processing application assigns the text editing widget.
This default behavior is identical to that of the default UI widget, described Default UI on page 423.
Barcode Widget
Barcodes are normally used only in non-interactive contexts (printing to paper or facsimile). Usually the barcode field is filled with data by a calculation and is not editable by the user. However XFA does permit barcode fields to be editable. When an editable barcode field gains focus the application displays some sort of edit widget, probably the same edit widget used for ordinary text fields. When the field loses focus the application may display it as a realistically rendered barcode or it may just display a placeholder. It only has to be rendered accurately to paper (or facsimile), not to glass. There are many different types of barcodes. Here is an example of a common type of barcode, code 3 of 9, displaying the text 1234567890. This barcode is life-sized but may not meet other requirements such as a requirement for whitespace surrounding the barcode.
1234567890
Button
The button widget (button) provides a button interface, usually associated with a click event. When the user selects the button, the click event is activated. Buttons usually have two appearances, an up appearance and a down appearance. The highlight property determines how the two appearances differ. However a button with its highlight property set
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to push has three appearances: up, down, and rollover. Moreover such a button may have a different legend in each state. The down and rollover legends are contained in the fields items property and must be named down and rollover, respectively.
Starting with XFA 2.5 a button widget in a dynamic form (but not in XFAF) may be an icon button. An icon button displays an image and may also display a text legend. The image is specified in the field default value and the legend in the field caption.
If the highlight property of an icon button is set to push the button can have three different images and three different legends.
Example 14.3 An icon widget with up, down, and rollover images and legends
<field ...> <ui> <button highlight="push"/> </ui> <caption> <value><text> Up Text </text></value> </caption> <value> <image contentType="image/jpeg" href="Up_Image.jpg"/> </value> <items> <image name="down" contentType="image/jpeg" href="Down_Image.jpg"/> <text name="down"> Down Text </text> <image name="rollover" contentType="image/jpeg"
The button widget is commonly used to trigger a click event that submits a completed form to a server. Button widgets do not provide a mechanism for entering a value for the parent field.
When the user selects the check button target, the widget fills in the target to indicate selection, as shown below. The user may select the button by clicking on it or by pressing the enter key when the containing field is in focus.
Choice List
The choice list widget (choiceList) describes a user interface that provides a set of choices. Some types of choice lists are also called drop-down lists.
Example 14.4 Basic choice list that provides a default and that uses selections as values
<field > <ui> <choiceList open="userControl | onEntry | always | multiSelect" commitOn="select | exit" textEntry="0 | 1" />
</ui> <items save="1"> <text>apples</text> <text>bananas</text> <text>pears</text> </items> <value> <text>apples</text> </value> </field>
The choice list widget has properties that affect how the widget behaves, whether it accepts user input, and when it propagates selected data values to the XFA Data DOM.
Choice list appearance after selecting data and then exiting the field
wheat rye
A multi-select choice list for which multiple items are selected. Such a list is always revealed.
Example 14.5 Choice list that associates hidden data values with selections
<field > <ui> <choiceList /> </ui> <items > <text>apples</text> <text>bananas</text> <text>pears</text> </items> <items save="1" presence="hidden"> <text>0</text> <text>1</text> <text>2</text> </items> </field>
The non-hidden items (apples, bananas, and pears) appear to the user as possible choices and the hidden items (0, 1, and 2) are used for data values. The association between non-hidden items and hidden ones is positional. For example, if the user selects apples the data value for the field is 0.
clicking a non-XFA interactive feature is the same as exiting the check list. In fact, the check list remains the field in focus.
If the field expects a date the fallback picture clause is the medium date format for the locale. If the field expects a time the fallback picture clause is the medium time format for the locale. If the field expects a date-time the fallback picture clause is a concatentation of the default medium date picture and the default medium time picture for the locale. The style of concatentation (which comes first and what character separates them) is dependent upon the locale.
See Localization and Canonicalization on page 139. A date-time dit widget may, upon selection, display a date picker. A date picker makes it easy to enter the current date or a date picked from a calendar-style display of dates. A date-time edit widget may optionally display comb lines in between character positions to improve the appearance of the text. It is possible for the field content to exceed the physical size allocated for display. By default a date-time edit widget supports horizontal scrolling to handle this situation. However scrolling may be forbidden by a setting of the hScrollPolicy property. In that case when the field is not selected content which extends beyond the physical space is not visible; upon selection the extra content may be made available, but whether it is or not is implementation-defined.
If the field expects a date, a date may be entered using the short default date picture for the locale or using the canonical date format. If the field expects a time, a time may be entered using the short default time picture clause for the locale or using the canonical time format
If the field expects a date-time, a date and time may be entered using a concatenation of the short default date and time picture clauses for the locale, with the style of the concatenation (which comes first and what character separates them) dependent upon the locale. Normally this picture clause allows the user to enter just a date without a time if desired. Alternatively a date-time may be entered using the canonical date-time format.
If the entered data is incompatible with the available formats, the XFA processing application nevertheless accepts the data as a string and displays it just as provided. The results of subsequent date and/or time calculations using the field content are not defined. The template may prevent this by specifying a validation test. The widget puts the data as entered into the formattedValue property of the node in the Form DOM that represents the field. If the data matched any supported picture it also converts the data into canonical format and puts that into the rawValue property of the same node. If the data did not match any supported picture it copies the formattedValue unchanged from the rawValue. A date-time edit widget may optionally supply comb lines in between character positions to assist the user in entering text. A date-time edit widget by default supports horizontal scrolling and allows the entry of content that is too long for the phsyical space available. Alternatively the hScrollPolicy property may forbid scrolling, in which case the user is prevented from typing or pasting content into the field beyond the physical space allocated.
Default UI
The default UI widget (defaultUi) allows a template to be defined without exact knowledge of the field content type. During form fill-in, the appearance and interaction of the default UI widget is determined by examining the contentType property of the data value node bound to the field. For example, if the content is a number, a numeric editing widget is used. This element can also supply additional hints to a custom GUI via its extras child. Form designers use the default UI widget when the type of data to be bound to the field is not known at the time the template is created. As a minimum the XFA processor should make the associations in the following table. content type boolean date date-time decimal float widget type
checkButton dateTimeEdit dateTimeEdit numericEdit numericEdit
widget type
imageEdit numericEdit textEdit dateTimeEdit
Numeric Edit
The numeric editing widget (numericEdit) helps the user supply an integer, float or decimal number or a currency amount.
As specified by the UI picture clause. Default short numeric format, as specified for the appropriate locale in the localeSet. Unless otherwise specified, localization is always done for the current locale. See Localization and Canonicalization on page 139. Canonical number format. Any string of characters.
If the data cannot be parsed as a number the XFA processor by default accepts the entered characters without complaint. However the form creator may supply the field with a validation test or some other script that verifies the data type.
If the data can be parsed as a number the widget puts the data as entered into the formattedValue property of the node in the Form DOM that represents the field. It also converts the data into canonical format and puts that into the rawValue property of the same node. However, starting with XFA 2.6, if the data cannot be parsed as a number the value placed in rawValue is zero. If the user enters an empty string (an enter key without numeric data), the widget sets the value of the field to the empty string. The corresponding rawValue is zero. A numeric edit widget may optionally supply comb lines in between character positions to assist the user in entering text. A numeric edit widget by default supports horizontal scrolling and allows the entry of content that is too long for the phsyical space available. Alternatively the hScrollPolicy property may forbid scrolling, in which case the user is prevented from typing or pasting content into the field beyond the physical space allocated.
First it tries to use the fields UI picture clause. If the UI picture clause fails (because the data does not match the picture clause) it tries to apply the default medium numeric picture clause specified for the locale in the localeSet. Unless otherwise specified, localization is always done for the current locale. See Localization and Canonicalization on page 139. If both the above fail it tries to display the data in the canonical number format. If all of the above fail it displays the data exactly as entered.
After the user de-selects the field, the entered data is propagated to the XFA Data DOM. Starting with XFA 2.6 the propagated data is always numeric. If the supplied characters do not parse as a number the value propagated to the XFA Data DOM is zero.
Signature Widget
The signature widget (signature) allows the user to sign the completed form. This is a signature covering the whole document or part of the document using the PDF signing facility. See User Experience with Digital Signatures on page 427.
Description Specifies the maximum number of characters that may be entered in the field. This is the string length, not necessarily the number of characters seen by the user. For example, the user may enter an accented letter which is expressed as two successive Unicode characters in the string. Specifies whether the text may be rich text, which is text that includes HTML styling instructions. Specifies whether a line entered in the field may wrap.
allowRichText multiLine
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Property name
hScrollPolicy
Description Specifies whether the text may scroll horizontally to accomodate text too wide for the physical width allocated. If not, and the field is single-line, the user is prevented from typing or pasting content that extends beyond the space allocated. Specifies whether the text may scroll vertically to accomodate a block of text too tall for the physical height available. If not, and the field is multi-line, the user is prevented from typing or pasting content that extends beyond the space allocated.
vScrollPolicy
The widget puts the data into both the formattedValue property and the rawValue property of the node in the Form DOM that represents the field. In addition if rich text is allowed the corresponding data nodes in the Data DOM are structured as described in Representing Rich Text in the XFA Data DOM on page 194. Optionally a text edit widget may supply comb lines in between character positions to assist the user in entering text. A comb can only be used when the widget is operating in a single-line non-scrollable mode.
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XML digital signatures are used to ensure data integrity, as described in Using Digital Signatures to Achieve Different Levels of Security on page 475.
Traversal order. An XFA template may be defined with a traversal order, which allows the user to tab from one field to the next (Traversal: Tabbing Order and Speech Order on page 428). Accelerator keys. An XFA template may include accelerator keys that allow users to move from field to field, by typing in a control sequence in combination with a field-specific character (Accelerator Keys: Using Keyboard Sequences to Navigate on page 432). Speech. An XFA template supports speech enunciation, by allowing a form to specify the order in which text descriptions associated with a field should be spoken (Speech of Text Associated with a Container on page 433). Visual aids. XFA template may specify text displayed when the tooltip hovers over a field or a subform (Other Accessibility-Related Features on page 433).
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Traversal specifications are provided in traversal elements, which may contain a set of traverse elements. Traverse specifications are properties of the following types of containers: subforms, exclusion groups, fields, and draws. Each traverse element contains an operation attribute that specifies a keystroke or event that triggers traversal, and a traverse destination. The traverse destination is specified as a SOM expression or as a script. In either case, the destination must resolve to a SOM expression for a valid layout object. Default transition directions are defined for any omitted traverse operations. If traversal order is not explicitly defined, it defaults to a left-to-right and top-to-bottom order.
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Explicitly-defined traversal
mySubform[0] FieldA 1 FieldB 3
Default traversal
mySubform[0] FieldA 1 FieldB 2
Non-Keystroke Traversals
Non-keystroke traverses are associated only with traverse elements that have operation values of next and first. The effect of the latter value is described in Delegating Focus to Another Container on page 431.
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Example 14.7 Default traversal for fields having a maximum number of characters
<subform name="mySubform" > <field name="A" x="5mm" y="20mm" > <ui /> <value > <text maxChars=3 /> </value> </field> <field name="B" x="45mm" y="20mm" > <ui /> <value > <text maxChars=3 /> </value> </field> </subform> <subform name="mySubform" > <field name="A" x="5mm" y="120mm"> <ui /> <value > <text maxChars=3 /> </value> </field> <field name="B" x="45mm" y="120mm" > <ui /> <value > <text maxChars=3 /> </value> </field> </subform>
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When the user tabs out of fieldA, a traversal to fieldB is queued. Next the event script runs with the focus (and current container) still set to fieldA. However the event script sets the focus explicitly to fieldC. As a side-effect of setting the focus explicitly, the traversal to fieldB is discarded without being executed. The same behavior applies if the user attempts to leave fieldA by clicking on another field, or via any other means of interactive navigation.
The following XFA template segment shows fields for which accelerator keys have been defined.
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If a form having the fields and exclusion groups summarized above is opened on a Windows system, typing the keys Alt and A takes the user to the field named fieldA and typing the the keys Alt and C takes the user to the exclusion group named exclusionGroupC.
Text defined by the speak element itself Text defined by the toolTip element Container caption, although this does not apply to speak properties within subform containers Container name
Example 14.11 Fragment using assist to declare row and column roles
<subform layout="table" columnWidths="1in -1" > <subform layout="row" name="TableHeading" > <assist role="TH"/> <draw name="ColumnHeadA" /> <draw name="ColumnHeadB" /> <draw name="ColumnHeadC" /> </subform> <subform name="TableRow" > <assist role="TR"/> <field name="CellA" /> <field name="CellB" /> <field name="CellC" /> </subform> </subform>
A speech-enabled XFA processing application might include role info in the spoken or tool-top information about a particular container. For example, if the user floats the tool tip over CellA, a speech program might announce information about the heading under which CellA appears.
15
Transform
434
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Sequence 6 7 8
Description Rename nodes based on element or attribute name Replace element name with attribute value Flatten substructure based on original element name Trim white space Modify structure based on empty content
Governed By
rename element in configuration nameAttr element in configuration presence element in configuration with value dissolveStructure whitespace element in configuration ifEmpty element in configuration
9 10 11 12 13 14
Group adjacent data into records groupParent element in configuration Nominate record elements Exclude records by position Supply default bind picture clause
record element in configuration range element in configuration picture element in configuration
For simplicity, the descriptions of some of the extended mapping rules below assume that the XFA Data DOM is first loaded using the default behavior and then the extended mapping rules are applied in subsequent passes by modifying the XFA Data DOM. Conforming implementations may reduce the number of physical passes to optimize performance provided the same end result is obtained. The extended mapping rules are invoked by supplying the appropriate content to elements in the XFA Configuration DOM. For many of those elements the content may be one of the following standardized keywords:
preserve preserve in every case causes the data loader to copy the content as-is from the XML data DOM into the XFA Data DOM. (Note that this description assumes that XML escape sequences such as """ have already been converted to literal Unicode characters in the XML data DOM. The details of an implementation may differ provided the effect is the same.) For most mapping rules preserve mimics the default behavior, but there are exceptions, which are described along with the individual mapping rules below. ignore ignore in every case causes the data loader to omit content from the XFA Data DOM but do not make any changes to it in the XML data DOM. If a subsequent unload operation is done, the data unloader inserts the ignored content into the output document at the appropriate place, copying it from the XML data DOM.
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remove remove in every case causes the data loader to omit content from the XFA Data DOM and also remove it from the XML data DOM. If a subsequent unload operation is done, the data unloader produces a document without the removed content.
Other keywords and their meanings are defined under the extended mapping rule in which they are used.
Document Range
The term document range refers to the extent of the XML data document that is processed by the data loader, such as the whole XML data document or a fragment, as previously described in the section Default Data Mapping Rules on page 118. Some extended mapping rules affect the position and extent of the document range. The set of elements associated with these rules consists of startNode, record, incrementalLoad, and window.
Transforms
Some of the extended mapping rules are known collectively as transforms. The elements that invoke these rules are only valid inside a transform element, as specified by the XFA configuration schema Config Specification on page 752. The set of elements associated with transforms consists of presence, whitespace, ifEmpty, nameAttr, rename and groupParent. The XFA Configuration DOM may include one or more transform elements. Each transform element has a ref attribute. The value of the ref attribute determines where the mapping is applied. The value is a list of one or more names, where each name is either an element tag or "*". The transform element applies to all data elements with tags that match any of the names in its list. "*" is a special pattern that matches all tags. The transform also matches all tags if the value of its ref attribute is an empty string (""). The set of data element tags that match a particular transform element is referred to here as the transform set for that element. The data loader applies the mapping to elements whose names match (case-sensitive) the value of the ref attribute or, if the value of the ref attribute is the empty string (""), to the entire document. Some transforms apply to all content of the matched element, including sub-elements, whereas other transforms apply only to the element itself and its character data. The scoping in each case is natural to the type of transform. For example, white space trimming transforms, when applied to data values, affect all of the descendants of the dataValue node containing data (as opposed to metadata), whereas renaming affects only the node corresponding to the nominated element or attribute itself. However, an element mapped by one transform may include an element mapped by the same or a different transform. The data loader responds to such nesting by applying the specified transforms sequentially in a depth-first manner. For example, if the transform for an outer element says it is to be discarded but the transform for an inner element says it is to be preserved, the inner element is at first preserved (by its own transform) but then discarded along with the other descendents of the outer element. Some transforms change the name of the node in the XFA Data DOM that corresponds to the element. These do not affect which later transforms will be applied to the node. Processing is controlled by the original element tag, not the name of the node in the XFA Data DOM. Note: The value of ref must be a simple node name. Readers who are familiar with XFA SOM expressions might assume that SOM expression syntax is valid here, but it is not. As a consequence of this restriction, the transforms within the transform element apply to every node in the document range with a matching name and appropriate type, regardless of the node's position in the tree.
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Each transform element must include at least one operation (child element). There must not be more than one child element of the same name within a single transform element. The data loader does not apply these transformations to any part of the XML data document above the start element, as described in The startNode Element on page 463. Likewise it does not apply these transformations to any part of the XFA Data DOM representing parts of the XML data document above the start element. Also, it does not apply these transformations to any part of the XML data document excluded from loading by the namespace rules except when carrying out a remove directive. When carrying out a remove, all descendents of the node to be removed from the XML DOM are also removed, regardless of namespace. The data loader applies these transformations in the order shown in the table in Extended Mapping Rules. The ignore keyword has an effect both when data is loaded into the XFA Data DOM and when it is unloaded into an XML data document. The other transforms only have effects when loading. It is not recommended for a single XFA Configuration DOM to contain multiple transform elements with the same value for ref. However if this does happen the data loader selects the highest-precedence transformation of the type currently being processed for a particular data element as shown by the following table. In the table higher precedence is indicated by a higher number.
Transform
presence
Precedence 3 2 1 0
Option
dissolveStructure dissolve ignore preserve normalize trim ltrim, rtrim preserve remove ignore dataGroup, dataValue
whitespace
3 2 1 0
ifEmpty
2 1 0
The table has no entries for the other transforms because they do not prioritize. Instead when there are conflicting transforms, the data loader uses the one that comes last in the configuration document. Similarly when different transforms have the same type and precedence (for example ltrim and rtrim) the data loader uses whichever comes last in the configuration document. For example, suppose the XFA configuration document contains the following.
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The order of processing for a book element in the XML data document is: 1. the last-occurring rename transformation publication 1. the higher-precedence presence transformation dissolve 2. the higher-precedence whitespace transformation normalize 3. the sole ifEmpty transformation remove The XFA Configuration DOM may contain a transform element with a ref value of "" (the empty string), which supplies a default transformation for all elements. The data loader applies this transformation to all elements that do not match a transform element with a non-empty value for ref. For example, consider the following fragment of an XFA configuration document.
causes leading and trailing white space to be trimmed from all dataValue node value properties except for those originating from address elements, which keep their leading and trailing white space. There can be multiple transform elements with a ref value of "". Conflicts between these are resolved the same way as described above for transform elements having identical values for ref.
Meaning Allows an implementation-defined behavior, which may have the effect of the ignore or preserve keywords.
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attribute keyword
ignore preserve
Meaning The data loader does not map attributes to dataValue nodes. The data loader maps attributes to dataValue nodes, except those attributes excluded by some other rule.
Invoking the extended mapping rule with preserve keyword produces the same results as the default mapping behavior for attributes. This default behavior excludes certain attributes that have special meanings. For more information see Attributes on page 129. Attributes may also be excluded from loading based on namespace (as described in The excludeNS Element on page 439). The data loader does not load attributes with excluded namespaces regardless of the value of the attributes element in the XFA Configuration DOM. Invoking the extended mapping rule with the ignore keyword causes the loader to exclude all attributes from the XFA Data DOM. This does not prevent the processing of attributes that have special meanings; they are still processed but are not represented by dataValue nodes in the XFA Data DOM. When the data is unloaded the XFA processor reinserts the attributes preserved in the XML Data DOM. It may reinsert them in a different order than their order in the original XML data document. This is permissible because the XML Specification [XML1.0] dictates that the order of elements is not significant. Apart from the above exclusions, the behavior specified by the XFA Configuration DOM overrides the default behavior for the entire XML data document.
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Assume that the XFA Configuration DOM has been set to load attributes into the XFA Data DOM, as described in The attributes Element on page 438. Without the excludeNS option, the resulting subtree of the XFA Data DOM contains:
[dataGroup (property) [dataGroup (farm) xlmns="http://www.example.org/orchard/"] [dataValue (tree) = "apple" xlmns="http://www.example.org/orchard/"] [dataValue (class) = "pome" contains="metadata" xlmns="http://www.example.org/orchard/"] [dataValue (tree) = "lemon" xlmns="http://www.example.org/orchard/"] [dataValue (class) = "citrus" contains="metadata" xlmns="http://www.example.org/orchard/"] [dataValue (plant) = "potato" namePrefix="field" xlmns="http://www.example.org/field/"] [dataValue (class) = "tuber" contains="metadata" xlmns="http://www.example.org/orchard/"] [dataValue (tree) = "poplar" xlmns="http://www.example.org/orchard/"] [dataValue (role) = "border" namePrefix="field" contains="metadata" xlmns="http://www.example.org/field/"]
Note that the xml:lang attribute of the property element is excluded by the default namespace exclusion rule described in Namespaces on page 121. The default namespace exclusions are mandatory and not controlled by the XFA Configuration DOM. If the excludeNS option was used to exclude http://www.example.org/field/, the XFA Data DOM would include only those portions shown below in bold.
Example 15.4 Same data as the previous example with highlighting to show inclusions
<property xml:lang="en"> <farm xmlns="http://www.example.org/orchard/" xmlns:field="http://www.example.org/field/"> <tree class="pome">apple</tree> <tree class="citrus">lemon</tree> <field:plant class="tuber">potato</field:plant> <tree field:role="border">poplar</tree> </farm> </property>
The namespace declarations on the farm element are processed by the data loader but not placed directly into the dataValue node corresponding to the element where they are found, as described in About the XFA Data DOM on page 110. However, since the farm element type does not include a
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namespace prefix it adopts the default namespace declared by one of its attributes. The resulting subtree of the XFA Data DOM would contain:
[dataGroup (property)] [dataGroup (farm) xmlns="http://www.example.org/orchard/"] [dataValue (tree) = "apple" xlmns="http://www.example.org/orchard/"] [dataValue (class) = "pome" contains="metadata" xlmns="http://www.example.org/orchard/"] [dataValue (tree) = "lemon" xlmns="http://www.example.org/orchard/"] [dataValue (class) = "citrus" contains="metadata" xlmns="http://www.example.org/orchard/"] [dataValue (tree) = "poplar" xlmns="http://www.example.org/orchard/"]
If instead the namespace "http://www.example.org/orchard/" was excluded, the XFA Data DOM would include the portions shown below in bold.
Example 15.5 Same data as the previous example with highlighting to show inclusions
<property xml:lang="en"> <farm xmlns="http://www.example.org/orchard/" xmlns:field="http://www.example.org/field/"> <tree class="pome">apple</tree> <tree class="citrus">lemon</tree> <field:plant class="tuber">potato</field:plant> <tree field:role="border">poplar</tree> </farm> </property>
Finally, if both "http://www.example.org/orchard/" and "http://www.example.org/field" were excluded, only the property element would remain. As an empty element it would by default be mapped to a dataValue node.
[dataValue (property) = ""]
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<ISBN>15536455</ISBN> <title>Introduction to XML</title> <firstname>Charles</firstname> <lastname>Porter</lastname> <ISBN>15536456</ISBN> <title>XML Power</title> <firstname>John</firstname> <lastname>Smith</lastname> </items>
Each group of related records begins with an ISBN element and ends with a lastname element. It would be appropriate to regroup the data so that each group of related records is descended from a unique book dataGroup node. This regrouping can be done by the loader. The result is that dataGroup nodes are inserted into the Data DOM which are not directly represented in the XML data document. The dataValue nodes from the XML data document are placed as children of the inserted groups as follows:
[items] [book] [ISBN = "15536455"] [title = "Introduction to XML"] [firstname = "Charles"] [lastname ="Porter"] [book] [ISBN = "15536456"] [title = "XML Power"] [firstname = "John"] [lastname = "Smith"]
The transformation that accomplishes this regrouping uses the groupParent element. The syntax is as follows.
When the loader encounters an ISBN element, it starts a new book dataGroup node and begins placing dataGroup nodes under it. It continues doing so until it encounters an element that is either not in the current transform set, or is in the set but has already occurred once within the record. Hence in the example it starts a new book dataGroup node (book[0]) when it encounters the first ISBN element, continues the same dataGroup node for the subsequent title, firstname, and lastname elements, then closes that dataGroup node because the next element (ISBN) has already appeared in the current record. Instead it starts a new dataGroup node (book[1]) and makes the next four dataValue nodes children of that dataGroup node. This algorithm makes it possible to correctly group dataValue nodes even if individual data values within a group are sometimes missing from the data, or in a different order than they are listed in the transform set. For example suppose the data had been as follows.
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Given the same configuration option, the resulting Data DOM would contain:
[items] [book] [ISBN = "15536455"] [title = "Introduction to XML"] [lastname ="Porter"] [book] [title = "XML Power"] [ISBN = "15536456"] [firstname = "John"] [lastname = "Smith"]
Note that when any groupParent transform is present in the configuration, the loader operates in a mode which accepts only record data. Any element other apart from the outermost enclosing element that is not listed in a groupParent transform set is ignored, that is, not loaded into the Data DOM. By contrast if the outermost enclosing element is not named in a groupParent transform set it is loaded in the normal (default) way. For example, suppose the data document above had additional elements as follows.
Given the same configuration option as the previous examples, the resulting Data DOM would contain:
[items] [book] [ISBN = "15536455"] [title = "Introduction to XML"] [lastname ="Porter"] [book] [title = "XML Power"] [ISBN = "15536456"] [firstname = "John"] [lastname = "Smith"]
In the example, the items element is not associated with any groupParent but it is the outermost element so it is loaded as a dataGroup node in the normal way. However, the reportDate element and the two pubDate elements are not loaded because they are not associated with any groupParent and
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they are not the outermost element in the data document. This shows how the transform can be used to exclude unwanted data. Sometimes a data value appears more than once within a single record. This can be handled simply by repeating the name of the data value in the transformation set. The loader accepts one child by that name for each occurrence of the name in the transformation set. For example, suppose each group of book data may contain up to two comment elements, as follows.
Example 15.9 Data for grouping with up to two comment elements per group
<items> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <firstname>Charles</firstname> <lastname>Porter</lastname> <comment>new</comment> <ISBN>15536456</ISBN> <title>XML Power</title> <firstname>John</firstname> <lastname>Smith</lastname> <comment>used</comment> <comment>good condition</comment> </items>
Example 15.10 Transform declaration for up to two comment elements per group
<transform name="ISBN, title, firstname, lastname, comment, comment"> <groupParent>book</groupParent> </transform>
The regrouping facility can also deal with a mixture of record types. Suppose the data file contained the following mixture of book and CD records.
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<firstname>Charles</firstname> <lastname>Porter</lastname> <cdid>4344-31020-2</cdid> <title>Big Calm</title> <artist>Morcheeba</artist> <ISBN>15536456</ISBN> <title>XML Power</title> <firstname>John</firstname> <lastname>Smith</lastname> </items>
A separate regrouping transform must be defined for the cd dataGroup node, as follows.
The result of applying both these transforms when loading the Data DOM is:
[items] [book] [ISBN = "15536455"] [title = "Introduction to XML"] [firstname = "Charles"] [lastname ="Porter"] [cd] [cdid = "4344-31020-2"] [title = "Big Calm"] [artist = "Morcheeba"] [book] [ISBN = "15536456"] [title = "XML Power"] [firstname = "John"] [lastname = "Smith"]
Note that title appears as a member of both the book group and the cd group. This is acceptable and does not cause any problems as long as title is not the first element in its logical record. If it is the first element in its record, the loader assigns it to the group parent defined by the first transform in document order that has the element tag in its transform set and that defines a group parent. Note that it does not matter whether or not title is the first name in its transform set. Order in the transform set is never significant. Grouping transforms can nest to any level. This is done by including the name of the parent for the inner group in the transform set for the outer group. For example we wish to group the firstname and lastname elements under an author dataGroup node, which is itself a child of the book dataGroup node. This is expressed as follows:
<transform name="ISBN, title, author"> <groupParent>book</groupParent> </transform> <transform name="firstname, lastname"> <groupParent>author</groupParent>
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</transform>
When the book data is loaded using these transformations, the result is:
[items] [book] [ISBN = "15536455"] [title = "Introduction to XML"] [author] [firstname = "Charles"] [lastname ="Porter"] [book] [ISBN = "15536456"] [title = "XML Power"] [author] [firstname = "John"] [lastname = "Smith"]
There is one important difference between grouping data values and grouping data groups. dataGroup nodes are allowed to repeat an unlimited number of times as siblings under the same parent, even though the name of the data group appears only once in its transform set. This rule is appropriate for most data documents. For example, consider the set of transforms defined for the previous example. The author dataGroup node contains at most two data values, firstname and lastname. It would not be appropriate to accept another firstname or lastname into the record containing the authors name. Similarly, in this database, each book can have only one ISBN and one title. However, a book can have any number of authors. For example, given the following data:
<items> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <firstname>Charles</firstname> <lastname>Porter</lastname> <firstname>Elizabeth</firstname> <lastname>Matthews</lastname> <ISBN>15536456</ISBN> <title>XML Power</title> <firstname>John</firstname> <lastname>Smith</lastname> </items>
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[ISBN = "15536455"] [title = "Introduction to XML"] [author] [firstname = "Charles"] [lastname ="Porter"] [author] [firstname = "Elizabeth"] [lastname ="Matthews"] [book] [ISBN = "15536456"] [title = "XML Power"] [author] [firstname = "John"] [lastname = "Smith"]
There is a limitation to the type of data that this transform can handle. The data must not contain nested dataValue nodes. (This implies that it must not contain rich text.) To deal with this use, the dissolveStructure option of the presence transform, described under The presence Element on page 453, to ensure the data is flattened before the groupParent transform processes it.
A dataGroup node is considered empty if and only if it has no children. A dataValue node is considered empty if and only if it has no children and its value property is equal to the empty string ("").
As described in Data Values Containing Mixed Content on page 124, a dataValue node representing mixed content has a value property equal to the ordered concatenation of the value properties of its content-containing children. Hence it can have a value property equal to the empty string if all of its children also have value properties equal to the empty string. However, even in this case it is not considered empty because it has children. Similarly a dataValue node representing an element with no content has a value property equal to the empty string, but if it has a child representing an attribute it is not considered empty. Attributes are not loaded by default but they may be loaded under control of a configuration option, as described in The attributes Element on page 438. Consider the following XML data document:
<item> <book> <ISBN registered="no"></ISBN> <title>Introduction to XML</title> <author>
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The elements firstname and lastname are considered empty. The author, book and item elements are not empty because each of them has children. Assuming attributes were not loaded the element ISBN is empty, however if attributes were loaded it is not empty. The XFA Configuration DOM may include one or more transform elements, each of which may include an ifEmpty element that overrides the default behavior. See Config Specification on page 752 for the full schema. If an ifEmpty element is present and the corresponding node is empty, the behavior specified by the ifEmpty element overrides the default behavior within the scope of the transform element. The ifEmpty element must contain one of ignore, remove, dataGroup, or dataValue, where:
ignore causes the data loader to remove the node representing the element from the XFA Data DOM, unless it is the root node. This does not affect the XML data DOM. remove causes the data loader to remove the node representing the element from the XFA Data DOM, unless it is the root node. In addition, if that node was removed from the XFA Data DOM, the data loader removes the node corresponding to the element from the XML data DOM, so that if a new XML data document is subsequently generated it does not contain the element. dataGroup causes the data loader to replace the dataValue node in the XFA Data DOM with a dataGroup node, unless the node's parent is a dataValue node. This does not affect the XML data DOM. dataValue causes the data loader to retain the dataValue node representing the element.
Invoking the extended mapping rule with dataValue produces the same results as the default behavior for empty elements as described in sectionData Values Containing Empty Elements on page 125. As described above, an ifEmpty operation will be suppressed if it is trying to remove the root node or if it is trying to make a dataGroup node the child of a dataValue node. When an operation is suppressed in this way, the data loader should not issue an error message because the same operation may operate legitimately on elements with the same name elsewhere in the XML data document, hence this is expected to be a common occurrence. Consider the following XML data document:
<item> <book> <ISBN></ISBN> <title>Introduction to XML</title> <author> <firstname></firstname> <lastname></lastname> </author> </book> </item>
With dataValue empty element handling, expressed in the XFA configuration document as:
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<transform ref="ISBN"> <ifEmpty>dataValue</ifEmpty> </transform> <transform ref="firstname"> <ifEmpty>dataValue</ifEmpty> </transform> <transform ref="author"> <ifEmpty>dataValue</ifEmpty> </transform>
the author dataGroup node is not changed to a dataValue node because it has children, hence is not empty. The result of the mapping is as follows:
[dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = ""] [dataValue (title) = "Introduction to XML"] [dataGroup (author)] [dataValue (firstname) = ""] [dataValue (lastname) = ""]
The above mapping is identical to that produced by default empty element handling, however it has a higher priority. Default empty element handling can be overridden by forced data group mapping as described below in The xfa:dataNode Attribute on page 467. By contrast dataValue empty element handling takes precedence over forced data group mapping. This is a consequence of coming earlier in the processing sequence. With dataGroup empty element handling, expressed in the XFA configuration document as:
<transform ref="ISBN"> <ifEmpty>dataGroup</ifEmpty> </transform> <transform ref="firstname"> <ifEmpty>dataGroup</ifEmpty> </transform> <transform ref="author"> <ifEmpty>dataGroup</ifEmpty> </transform>
With ignore empty element handling, expressed in the XFA configuration document as:
<transform ref="ISBN"> <ifEmpty>ignore</ifEmpty> </transform> <transform ref="firstname"> <ifEmpty>ignore</ifEmpty> </transform> <transform ref="author">
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<ifEmpty>ignore</ifEmpty> </transform>
the author dataGroup node is not ignored because it has a child and is therefore not empty. Hence the result of the mapping in the XFA Data DOM is as follows:
[dataGroup (item)] [dataGroup (book)] [dataValue (title) = "Introduction to XML"] [dataGroup (author)] [dataValue (lastname) = ""]
the firstname and lastname dataValue nodes are both deleted from the XFA Data DOM, leaving the author dataGroup node empty, so it in turn is deleted. This results in the following mapping in the XFA Data DOM:
[dataGroup (item)] [dataGroup (book)] [dataValue (title) = "Introduction to XML"]
The data loader ensures that the order of declaration of ifEmpty rules in the configuration document does not affect the outcome of empty node processing. One way to do this is to perform an ifEmpty pass over the XFA Data DOM in bottom-up order, that is to perform the ifEmpty processing on the return back from a leaf node towards the root. Alternatively ignore can be applied to the whole document as follows:
<transform ref=""> <ifEmpty>ignore</ifEmpty> </transform>
and in this case the recursive deletion of all empty nodes results in the following mapping in the XFA Data DOM:
[dataGroup (item)] [dataGroup (book)] [dataValue (title) = "Introduction to XML"]
With remove in place of ignore, the result of the mapping in the XFA Data DOM is the same in every case as for ignore (above), but for every node deleted from the XFA Data DOM the corresponding node in the XML data DOM is also deleted.
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This section describes an extended mapping rule that can be used to alter the handling of data expressed as inverted XML. This affects the XFA Data DOM but has no effect on the XML data DOM. By default, as described in Default Data Mapping Rules on page 118, the name property of each node in the XFA Data DOM is copied from the local part of the element type of the corresponding element in the XML data document. This extended mapping rule provides for behaviors in which the name property of a nominated element is taken from the value of its nominated attribute. The XFA Configuration DOM may include one or more transform elements, each of which may enclose a nameAttr element that overrides the default behavior. See Config Specification on page 752 for the full schema. The behavior specified by the nameAttr element overrides the default behavior for elements matching the ref property of the transform element. For each such element that has an attribute with the given name that has a non-empty value, the data loader copies the value of the nominated attribute into the name property of the associated node in the XFA Data DOM. For such elements the data loader does not load the nominated attribute as a dataValue node even when attribute loading is enabled, as described in The attributes Element on page 438; this applies even if the attribute has an empty value. For the example data above, the following fragment in the XFA configuration document would cause the inverted XML to be represented in the XFA Data DOM the same way as the conventional XML:
<transform ref="item"> <nameAttr>nodename</nameAttr> </transform>
Although this renaming is performed before some other transformations it does not affect which later transformations apply to the renamed node. For example, the following configuration fragment:
<transform ref="item"> <nameAttr>nodename</nameAttr> <whitespace>normalize</whitespace> </transform>
causes the data from the address elements in the above example to be renamed. It also causes those same nodes to be normalized in whitespace, even though their names no longer match the ref value in the transform element.
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The XFA configuration document must not declare multiple different nameAttr mappings for the same value of ref. For example, the following fragment from an XFA configuration document illegally declares two different nameAttr mappings for foo:
<transform ref="foo"> <nameAttr>x</nameAttr> </transform> <transform ref="foo"> <nameAttr>y</nameAttr> </transform>
This is forbidden because it can lead to paradox. For example, consider the above illegal configuration fragment and the following XML data document:
<foo x="abc" y="def">some content</foo>
If the configuration was legal, the data loader would be required to map the data value simultaneously to both names abc and def, which is impossible. If the value supplied by the nominated attribute is not a valid XML node name, the behavior of the data loader is implementation-defined. Note that this mapping is data-dependent in that the data determines what node names result. Consequently it is not reversible; inverted XML can be loaded into the XFA Data DOM but cannot be copied back into the XML data DOM.
In this case, since the value of the ref attribute is prix, the default picture clause applies only to data elements named prix, after any renaming imposed by other extended mapping rules. As always with picture clauses, if the data does not match the picture clause the picture clause has no effect. For example if the data was "gratis" both the rawValue and value properties of the field would be set to
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"gratis". For more information about picture clauses see Picture Clause Specification on page 1002. For an introduction to localization and canonicalization, see Localization and Canonicalization on page 139.
Directs the data loader to Preserves the original hierarchy. Removes the node matching the ref property and also its descendents from the XFA Data DOM but not from the XML data DOM, unless the node is the root node in which case the original hierarchy is preserved. Removes the dataGroup node matching the ref property from the XFA and XML data DOMs, promoting its immediate children to children of its parent, unless the node is the root node in which case it is preserved. Descendents are not affected by this operation. Removes all dataGroup nodes that are descendants of the node matching the ref property from the XFA and XML data DOMs. The matching node itself is not removed. All dataValue nodes that are descendants of the node are promoted to children of the node.
dissolve
dissolveStructure
Invoking the extended mapping rule with preserve produces the same results as the default mapping behavior for element names as described in About the XFA Data DOM on page 110. Note the different scope for each keyword. In summary, ignore affects the specified node and its descendents, whereas dissolve affects just the specified node and dissolveStructure affects just the descendents. Consider the following XML data document:
<item> <book> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <author> <firstname>Charles</firstname> <lastname>Porter</lastname> </author> </book> </item>
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With no suppression of data group mapping, expressed in the XFA configuration grammar [Config Specification on page 752] as:
<transform ref="book"> <presence>preserve</presence> </transform>
The following example suppresses the author dataGroup node and its substructure, expressed in the XFA configuration document as:
<transform ref="author"> <presence>ignore</presence> </transform>
The following example suppresses the data group mapping of the book element, expressed in the XFA configuration document as:
<transform ref="book"> <presence>dissolve</presence> </transform>
Because dissolve also modifies the XML data DOM, when the data unloader creates a new XML data document the new document reflects the dissolve operation. In this case the resulting XML data document contains:
<item> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <author> <firstname>Charles</firstname> <lastname>Porter</lastname> </author> </item>
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The following example suppresses all data group mapping within the book element, expressed in the XFA configuration document as:
<transform ref="book"> <presence>dissolveStructure</presence> </transform>
Because dissolveStructure also modifies the XML data DOM, when the data unloader creates a new XML data document the new document reflects the dissolveStructure operation. In this case the resulting XML data document contains:
<item> <book> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <firstname>Charles</firstname> <lastname>Porter</lastname> </book> </item>
The data loader does not issue a warning when ignore or dissolve is suppressed at the root node, because the same element type may legitimately appear other places in the XML data document.
A record number is a positive base ten integer specifying a record index that is to be included in the set. The index of the first record in the XML data document is 0, of the second is 1, and so on. A record number range is a positive base ten integer followed by a hyphen character ("-") followed by another positive base ten integer, specifying a range of record indices that are to be included in the set. The range includes the two numbers given. The two integers may be in either order, smallest-first or largest-first.
All records with indices in the set are processed. The set of indices may extend beyond the index of the last record in the XML data document (indeed it is expected that this will frequently be the case).
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Use of this mapping rule does not affect the order in which records are processed, only which ones are included. Therefore the order of processing will be the same as described elsewhere in this specification.
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<item> <book> <ISBN>15536455</ISBN> <title>Introduction to XML</title> </book> </item> <item> <book> <ISBN>15536456</ISBN> <title>XML Power</title> </book> </item> </order>
Note that there are two cases in which a node in the XML data DOM might have the correct name and level but not cause a record to be marked. First, the node in the XML data DOM might be mapped into a dataValue node in the XFA Data DOM, but dataValue nodes cannot be marked as records because they have no isRecord property. Second, the node in the XML data DOM might be excluded from the XFA Data DOM because of its namespace, as described in The excludeNS Element on page 439, in which case there is nothing to mark as a record. It is also worth noting that namespace exclusion may raise the level of a node in the XFA Data DOM relative to the corresponding node in the XML data DOM, when a container element is excluded but not its contained element, as described in The excludeNS Element on page 439. The level that matters in determining which dataGroup nodes are records is the level in the XML data DOM, not the level in the XFA Data DOM. This is appropriate because the record structure is normally expressed in the structure of the XML data document as it is supplied before any exclusions. Consider the following XML data document:
<order> <number>1</number> <shipto> <reference><customer>c001</customer></reference> </shipto> <contact>Tim Bell</contact> <date><day>14</day><month>11</month> <year>1998</year></date> <item> <book> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <author> <firstname>Charles</firstname> <lastname>Porter</lastname> </author> <quantity>1</quantity> <unitprice>25.00</unitprice> <discount>.40</discount> </book> </item> <item> <book> <ISBN>15536456</ISBN> <title>XML Power</title>
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<author> <firstname>John</firstname> <lastname>Smith</lastname> </author> <quantity>2</quantity> <unitprice>30.00</unitprice> <discount>.40</discount> </book> </item> <notes>You owe $85.00, please pay up!</notes> </order>
With no record element in the XFA Configuration DOM, the order element is considered to be the one and only record. The dataGroup node representing the single record is represented in bold type:
[dataGroup (order)] [dataValue (number) = "1"] [dataGroup (shipTo)] [dataGroup (reference)] [dataValue (customer) = "c001"] [dataValue (contact) = "Tim Bell"] [dataGroup (date)] [dataValue (day) = "14"] [dataValue (month) = "11"] [dataValue (year) = "1998"] [dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"] [dataGroup (author)] [dataValue (firstname) = "Charles"] [dataValue (lastname) = "Porter"] [dataValue (quantity) = "1"] [dataValue (unitprice) = "25.00"] [dataValue (discount) = ".40"] [dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = "15536456"] [dataValue (title) = "XML Power"] [dataGroup (author)] [dataValue (firstname) = "John"] [dataValue (lastname) = "Smith"] [dataValue (quantity) = "2"] [dataValue (unitprice) = "30.00"] [dataValue (discount) = ".40"] [dataValue (notes) = "You owe $85.00, please pay up!"]
The following example assumes that the record element contains item.The result of mapping the same XML data document is as follows, with the dataGroup nodes representing records appearing in bold type:
[dataGroup (order)] [dataValue (number) = "1"] [dataGroup (shipTo)] [dataGroup (reference)] [dataValue (customer) = "c001"]
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[dataValue (contact) = "Tim Bell"] [dataGroup (date)] [dataValue (day) = "14"] [dataValue (month) = "11"] [dataValue (year) = "1998"] [dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"] [dataGroup (author)] [dataValue (firstname) = "Charles"] [dataValue (lastname) = "Porter"] [dataValue (quantity) = "1"] [dataValue (unitprice) = "25.00"] [dataValue (discount) = ".40"] [dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = "15536456"] [dataValue (title) = "XML Power"] [dataGroup (author)] [dataValue (firstname) = "John"] [dataValue (lastname) = "Smith"] [dataValue (quantity) = "2"] [dataValue (unitprice) = "30.00"] [dataValue (discount) = ".40"] [dataValue (notes) = "You owe $85.00, please pay up!"]
The expression of data records via a node level is likely not the typical usage of this extended mapping rule, but does have particular utility in specific cases similar to the one illustrated below. Using the previous XML data document as an example, with a record element containing 1, the result of the mapping is as follows:
[dataGroup (order)] [dataValue (number) = "1"] [dataGroup (shipTo)] [dataGroup (reference)] [dataValue (customer) = "c001"] [dataValue (contact) = "Tim Bell"] [dataGroup (date)] [dataValue (day) = "14"] [dataValue (month) = "11"] [dataValue (year) = "1998"] [dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"] [dataGroup (author)] [dataValue (firstname) = "Charles"] [dataValue (lastname) = "Porter"] [dataValue (quantity) = "1"] [dataValue (unitprice) = "25.00"] [dataValue (discount) = ".40"] [dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = "15536456"]
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[dataValue (title) = "XML Power"] [dataGroup (author)] [dataValue (firstname) = "John"] [dataValue (lastname) = "Smith"] [dataValue (quantity) = "2"] [dataValue (unitprice) = "30.00"] [dataValue (discount) = ".40"] [dataValue (notes) = "You owe $85.00, please pay up!"]
As a result of the above mapping, the XML data document is partitioned into four records: shipTo, date, item, item. The two item records represent the same grouping of data as order items. The other two records shipTo and date don't represent the same grouping of data as order items, and they don't even relate directly to each other. Given this XML data document, such a mapping is only useful if the processing application is able to discriminate among the dataGroup nodes that are of interest. This example illustrates how the expression of data records via a node level can easily produce a mapping of heterogeneous data records. In cases where the XML data document makes use of different element types for roughly the same grouping of data, the ability to express data records via a node level is very useful, as illustrated by the following example with a record element containing 1.
<order> <bookitem> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <author> <firstname>Charles</firstname> <lastname>Porter</lastname> </author> <quantity>1</quantity> <unitprice>25.00</unitprice> <discount>.40</discount> </bookitem> <musicitem> <cdid>4344-31020-2</cdid> <title>Big Calm</title> <artist>Morcheeba</artist> <quantity>1</quantity> <unitprice>19.00</unitprice> </musicitem> </order>
The result of the mapping,with the dataGroup nodes representing records appearing in bold type, is as follows:
[dataGroup (order)] [dataGroup (bookitem)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"] [dataGroup (author)] [dataValue (firstname) = "Charles"] [dataValue (lastname) = "Porter"] [dataValue (quantity) = "1"] [dataValue (unitprice) = "25.00"] [dataValue (discount) = ".40"] [dataGroup (musicitem)]
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(cdid) = "4344-31020-2"] (title) = "Big Calm"] (artist) = "Morcheeba"] (quantity) = "1"] (unitprice) = "19.00"]
The XML data document may have content that is outside any record. Although such content is not marked as part of a record, it is nevertheless loaded into the XFA Data DOM. Although it is not inside any record it can still be used in special circumstances, for example if a calculation explicitly makes reference to it. For example, the previous example could be modified with some extra-record data as follows:
<order> <customername>Delta Books</customername> <customerorder>300179</customerorder> <bookitem> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <author> <firstname>Charles</firstname> <lastname>Porter</lastname> </author> <quantity>1</quantity> <unitprice>25.00</unitprice> <discount>.40</discount> </bookitem> <musicitem> <cdid>4344-31020-2</cdid> <title>Big Calm</title> <artist>Morcheeba</artist> <quantity>1</quantity> <unitprice>19.00</unitprice> </musicitem> </order>
When this is loaded into the XFA Data DOM, the additional data is not part of any record but is available for use.
[dataGroup (order)] [dataValue (customername) = "Delta Books"] [dataValue (customerorder) = "300179"] [dataGroup (bookitem)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"] [dataGroup (author)] [dataValue (firstname) = "Charles"] [dataValue (lastname) = "Porter"] [dataValue (quantity) = "1"] [dataValue (unitprice) = "25.00"] [dataValue (discount) = ".40"] [dataGroup (musicitem)] [dataValue (cdid) = "4344-31020-2"] [dataValue (title) = "Big Calm"] [dataValue (artist) = "Morcheeba"] [dataValue (quantity) = "1"] [dataValue (unitprice) = "19.00"]
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With name mapping for author and title elements, expressed in the XFA configuration document as:
<transform ref="author"> <rename>writer</rename> </transform> <transform ref="title"> <rename>bookName</rename> </transform>
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[dataGroup (ISBN)] [dataValue (bookName) = "Introduction to XML"] [dataGroup (writer)] [dataValue (firstname) = "Charles"] [dataValue (lastname) = "Porter"]
Although renaming is performed before some other transformations it does not affect which later transformations apply to the renamed node. For example, the following configuration fragment:
<transform ref="address"> <rename>MailingAddress</rename> <whitespace>normalize</whitespace> </transform>
causes data from address elements to be renamed to MailingAddress in the Data DOM. It also causes those same nodes to be normalized in whitespace, even though their names no longer match the ref value in the transform element. Almost any valid XML tag or attribute name (as defined in [XML]) can be used in the XML data document without a name mapping. The only restriction of XFA names which does not also apply to XML names is that XFA names may not contain an embedded ":" (colon). Fortunately XML such as the following, while legal, is rarely encountered.
<outer xmlns:abc="http://example.org/ns/abc/"> <abc:foo:bar>xxx</png:foo:bar> </outer>
In the example the inner data element has the name foo:bar. To map this into theXFA Data DOM it would be necessary to rename the data value. For example,
<transform ref="foo:bar"> <rename>foo_bar</rename> </transform>
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<reference><customer>c001</customer></reference> </shipto> <contact>Tim Bell</contact> <date><day>14</day><month>11</month> <year>1998</year></date> <item> <book> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <author> <firstname>Charles</firstname> <lastname>Porter</lastname> </author> <quantity>1</quantity> <unitprice>25.00</unitprice> <discount>.40</discount> </book> </item> <item> <book> <ISBN>15536456</ISBN> <title>XML Power</title> <author> <firstname>John</firstname> <lastname>Smith</lastname> </author> <quantity>2</quantity> <unitprice>30.00</unitprice> <discount>.40</discount> </book> </item> <notes>You owe $85.00, please pay up!</notes> </order>
Assume that the start node has been set with "xfasom(order.item[1].book)". Recall that XFA SOM expressions use zero-based indexing, so "item[1]" refers to the second instance of item. The result of the mapping is as follows:
[dataGroup (book)] [dataValue (ISBN) = "15536456"] [dataValue (title) = "XML Power"] [dataGroup (author)] [dataValue (firstname) = "John"] [dataValue (lastname) = "Smith"] [dataValue (quantity) = "2"] [dataValue (unitprice) = "30.00"] [dataValue (discount) = ".40"]
With a start element expressed as "xfasom(order.item)", the result of the mapping is as follows:
[dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"] [dataGroup (author)] [dataValue (firstname) = "Charles"]
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It should be noted that an identical mapping is produced with a start element expressed as "xfasom(order.item[0])". With a start element expressed as "xfasom(order.item[1])", the result of the mapping is as follows:
[dataGroup (item)] [dataGroup (book)] [dataValue (ISBN) = "15536456"] [dataValue (title) = "XML Power"] [dataGroup (author)] [dataValue (firstname) = "John"] [dataValue (lastname) = "Smith"] [dataValue (quantity) = "2"] [dataValue (unitprice) = "30.00"] [dataValue (discount) = ".40"]
Directs the data loader to Trim white space from both ends but preserve embedded white space, both in the XFA Data DOM and in the XML data DOM. Trim trailing white space but preserve leading and embedded white space, both in the XFA Data DOM and in the XML data DOM. Trim leading white space but preserve embedded and trailing white space, both in the XFA Data DOM and in the XML data DOM.
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whitespace value
normalize
Directs the data loader to Trim leading and trailing white space and replace each instance of embedded white space with a single SPACE character (U+0020), both in the XFA Data DOM and in the XML data DOM. Preserve all white space.
preserve
When the document contains mixed content, the operation is performed on the complete text of the value property of the outermost data value, then the inner data values are modified as necessary to remain consistent. When the operation is normalize, where within mixed content there is embedded white space at the end of one data value, whether or not the next data value starts with white space, the replacement SPACE character is assigned to the first data value; but where a data value ends in non-white space and the next data value starts with white space, the replacement SPACE character is assigned to the second data value. For example, consider the following XML data:
<book> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <desc>Primer on <keyword> XML </keyword> </book>
technology.</desc>
The resulting XFA Data DOM, after default white space handling (preserve), is as follows:
[dataGroup (book)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"] [dataValue (desc) = "Primer on XML technology."] [dataValue () = "Primer on "] [dataValue (keyword) = " XML "] [dataValue () = " technology."]
After the normalize operation no more than one blank separates each word:
[dataGroup (book)] [dataValue (ISBN) = "15536455"] [dataValue (title) = "Introduction to XML"] [dataValue (desc) = "Primer on XML technology."] [dataValue () = "Primer on "] [dataValue (keyword) = "XML"] [dataValue () = " technology."]
In the following example two different transforms are defined, rtrim for one element and ltrim for the other.
<transform ref="desc"> <whitespace>rtrim</whitespace> </transform> <transform ref="keyword"> <whitespace>ltrim</whitespace> </transform>
In the XML data document an element that is nominated for rtrim encloses an element nominated for ltrim.
<desc>Primer on<keyword> XML </keyword> </desc>
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The result is that the inner element is first subject to ltrim on its own, and then to rtrim as content of the outer element. Hence the value of the inner element starts off as " XML ", is trimmed on the left to become "XML ", and then trimmed on the right as part of the string "Primer on XML ", resulting finally in:
[dataValue (desc) = "Primer onXML"] [dataValue (keyword) = "XML"]
Directs the data loader to Map the associated element to a dataValue node according the rules defined by this specification. Map the associated element to a dataGroup node according the rules defined by this specification.
The data loader does not permit this extended mapping rule to be used to violate the relationships between dataGroup nodes and dataValue nodes, as described by this specification. For instance, as a result of a forced mapping of an element to a dataValue node, the element's contained elements are not considered as candidate data groups, because dataValue nodes can be ancestors only to other dataValue nodes. Similarly, a forced mapping attempt to a dataGroup node does not succeed where the dataGroup node would be descended from a dataValue node, again because dataValue nodes can be ancestors only to other dataValue nodes. Any attempt to force the mapping of an element that would violate the relationships between dataGroup nodes and dataValue nodes is detected by the data loader and the request ignored. The following examples illustrate the usage of this extended mapping rule. Consider the following example:
<book xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/"> <ISBN xfa:dataNode="dataGroup">15536455</ISBN> <title>Introduction to XML</title> <author xfa:dataNode="dataValue" ><firstname>Charles</firstname ><lastname>Porter</lastname ></author> <desc xfa:dataNode="dataGroup">Basic primer on <keyword>XML</keyword > technology.</desc> </book>
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In the above example, the XML for the author element has been modified from previous similar examples which had the firstname and lastname on separate lines and indented to aid legibility. This white space was removed for this example in order to produce the mapping above. See the section White Space Handling on page 132 for more information on white space handling inside data values. When this extended mapping rule causes an element containing character data, which would otherwise be mapped to a dataValue node, to be mapped instead to a dataGroup node, the data loader inserts an unnamed dataValue node as child of the dataGroup node to hold the character data. For example, given the following XML data document:
<book xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/"> <ISBN>15536455</ISBN> <title xfa:dataNode="dataGroup">Introduction to XML</title> </book>
After loading with default mapping rules the XFA Data DOM contains:
[dataGroup (book)] [dataValue (ISBN) = "15536455"] [dataGroup (title)] [dataValue () = "Introduction to XML"
A common use for this extended mapping rule is to ensure that an empty element that represents a data group is not mapped to a dataValue node as would occur based on the default mapping rules described in the section Data Values Containing Empty Elements on page 125. Consider the following example:
<book> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <author/> </book>
We know from previous examples that the element author is a data group element that usually encloses data value elements firstname and lastname; however, in this specific example, the author element is empty and therefore would, by default, map to a dataValue node. To ensure that the author element maps to a dataGroup node, the following example uses this extended mapping rule:
<book xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/"> <ISBN>15536455</ISBN> <title>Introduction to XML</title> <author xfa:dataNode="dataGroup"/> </book>
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Note: This extended mapping rule only overrides the default mapping rule for non-empty elements. It does not override the extended mapping rule for empty elements, which is described in the section The ifEmpty Element on page 447 if the extended mapping rule for empty elements is declared in the XFA configuration document.
XSLT Transformations
XSLT is a special-purpose language defined by [XSLT]. An XSLT program or stylesheet can be used to transform an input XML document into an output XML or non-XML document. XFA supports the use of XSLT to transform arbitrary XML input data into a temporary XML document, which is then loaded by the XFA loader. XFA also supports the use of XSLT to transform the output XML document into a final arbitrary XML or non-XML document. Note that XSLT is not reversible, hence if it is necessary to round-trip two different XSLT stylesheets are required, one for the input transformation and one for the output transformation.
XSLT Preprocessing
This section describes a facility that can be used to modify the incoming data under control of an XSLT script [XSLT]. This transformation makes changes to the XML data DOM before the XFA Data DOM is loaded by the data loader. Thus, if a new XML data document is created it reflects the result of the XSLT preprocessing. Note that it is possible to incorporate a processing instruction into the XML data document that causes an XSLT transformation to be applied before (or as) the data is loaded into the XML data DOM. This is quite separate from the facility described here. The facility described here does not require the addition of a processing instruction, or any other modification, to the XML data document. The XFA Configuration DOM may include an xsl element. If present, the xsl element must contain a uri element that nominates the XSLT script. See Config Specification on page 752 for the full schema. When the xsl element is supplied, the data loader executes the script and uses its output in place of the original XML data document. The XFA Configuration DOM may include a debug element that nominates a place in which to save a copy of the data after the XSLT transformation but before any other transformations. If the debug element is supplied and is non-empty, and the XSLT transformation is performed, the data loader copies the output of the XSLT transformation into the nominated place. For example, the following fragment from an XFA configuration document causes the script "massage.xslt" to be used for preprocessing the XML data document. The preprocessed document is copied to "massage.xml" before being loaded by the data loader.
<xsl> <debug> <uri>massage.xml</uri> </debug> <uri>massage.xslt</uri> </xsl>
XSLT Postprocessing
This section describes an extended mapping rule that can be used to modify data being written to a new XML data document under control of an XSLT script [XSLT].
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The XFA Configuration DOM may include an outputXSL element. If present, the outputXSL element must contain a uri element that nominates the XSLT script. See Config Specification on page 752 for the full schema. When the outputXSL element is supplied, the data loader executes the script after applying all other transformations to the data. Note that debug may not be used inside outputXSL. For example, an XFA Configuration DOM includes the following fragment:
<outputXSL> <uri>out.xslt</uri> </outputXSL>
This causes the output XML document from the data loader to be passed to an XSLT interpreter, along with the local file "out.xslt", which contains an XSLT style sheet. The style sheet supplies all required additional configuration such as the destination of the transformed document.
16
471
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Example 16.1 Submitting event that sends the template and data to the target server
<subform > <field > <event activity="click" > <submit format="xdp" xdpContent="template datasets" /> </event> </field> </subform>
If an XFA template includes a UUID and time stamp and that template is submitted to a server, the UUID and time stamp are included in the XDP or PDF created for that template.
Referenced images, where the reference is represented as an href specification (Image Data on page 133) Embedded references in rich text, where the reference is represented as an xfa:embed, where the adjacent xfa:embedType is set to "URI" (Embedded Object Specifications on page 1056)
Whether such external references are resolved depends on the trust given to the URI described in that reference.
Trusted. If the href reference is trusted, the image data may be included in the XFA Data DOM regardless of where the reference points. Not trusted. If it is not trusted, the XFA processor verifies that the referenced location is inside the current package, i.e. inside the XDP or PDF that supplied the template. If it is not inside the current package the reference is blocked.
Referenced images in data are described in Image Data on page 133. Caution: Image references that point outside the package, even to a trusted URI, are undesireable from the standpoint of reliability and portability. See Structuring Forms for Portability and Archivability on page 491 for more information. Acrobat requires any images that are supplied with a form to be included in the package. Image references are resolved based on the images in the package. If a reference cannot be resolved in the package the image is not displayed. However image fields (fields with an image-picker UI type) allow the user to pick an image from some other place, for example from a file on disk. In this case Acrobat saves a copy of the image by value so it is rendered correctly.
Caution: For maximum security the form must also be certified (that is, signed by the form creator). This prevents a form of man-in-the-middle-attack in which the blank form is intercepted by a third party and the third party tricks the client into submitting data to a forged URI.
XML digital signature. One or more signatures can be inserted into a form using the mechanism defined by the W3C for an XML Digital Signature [XMLDSIG-CORE]. This mechanism is selective in regard to what portion of the form is included in the signature. It can be used to sign any or every portion of the form which is expressed in XML, including the template, the configuration document, and/or the data. The clickable feature that produces an XML digital signature is an event with a signData property. PDF digital signature. A form which is embedded inside PDF can use the PDF signing mechanism [PDF]. The PDF signing mechanism may sign the whole of the XFA form and in addition may sign non-XFA content of the form. Hence a PDF signature can generate a document of record, which is described in the next section. The clickable feature that produces a PDF digital signature is a signature widget.
A single form may contain multiple XML digital signatures and multiple PDF digital signatures, although such use is not expected to be useful.
There are several different types of signature purposes, each of which imposes its own requirements. The different types of signatures are summarized by the following table. The following sections explain how digital signatures can be used to achieve these purposes. Similar information on PDF digital signatures is available in the PDF Reference [PDF] and in A primer on electronic document security [ElectronicSecurity].
Signature purposes
Purpose Integrity Use Verify that data has not been corrupted in transit or processing. For example, when a digital signature is applied to a quarterly financial statement, recipients have more assurance that the financial information has not been altered since it was sent. See Integrity on page 479. Verify a signers digital identity. For example, a digitally signed quarterly financial statement allows recipients to verify the identity of the sender and assures them that the financial information has not been altered since it was sent. See Authenticity on page 481. How achieved
Signature based on relevant parts of the form and optionally a private key
Signature based on selected portions of the template and configuration and on pre-rendered PDF and a private key Verification using a public key Assurance of the senders identity
Non- repudiability Achieving this purpose results in a "certified document". Usage rights Achieving this purpose results in a "ubiquitized document". (a PDF capability)
Establish unequivocally that the person signing the document did in fact see and sign the document, or to establish that the recipient did in fact receive the document. See Non- Repudiability on page 481.
Trusted third-party software prevents the signer of the document from denying that they signed the document Establish the identity of the granting authority Specify additional rights to be granted by the special viewing application
If signature permissions have been issued by a bona fide granting authority, enable additional rights (such as the ability to sign) in special viewing applications such as Acrobat. See Usage Rights Signatures (Ubiquitized Documents) on page 482..
client to a host. In such cases the contents of the envelope are not limited by this specification so any appropriate signature mechanism can be used.
Packaging of XFA form components into XDP or PDF Internal XFA form components
XFA
datasets
template
XML
XDP
An XML document
A PDF document
datasets
template
template
FDF (annots)
Other objects
data
Data
The following scenarios describe the addition and use of digital signatures in forms.
Adding a PDF digital signatures to an existing template
In the following scenario, PDF digital signatures are added to the PDF that contains the XFA. Such a PDF digital signature can be used to produce a document of record, by referencing the XFA object from the manifest. The form created by the following scenario can be opened only with a PDF-processing application, such as Acrobat. That is, it cannot be opened with XML-processing applications because it is not conforming XML. 1. A form designer creates the form using an XFA creating application such as Adobe LiveCycle Designer. 2. The designer creates a submission button that causes the entire form to be included in the submission. This is the format in which the form data and parts of the form are submitted to a server when the user completes the form and selects the forms submit button. (This statement assumes a rather simple form submission process.) 3. The designer saves the form as PDF. 4. The designer opens the form using a PDF-capable application such as Acrobat. 5. The designer applies a PDF digital signature widget. (Acrobat Professional is required for this operation.)
6. The designer saves the resulting form, again as PDF. The following scenario applies when the form is being filled out. 1. The form is opened using a PDF-capable application that also supports XFA, such as Acrobat. 2. In the case of a trusted document, the application declares the trustability of the form. 3. The person fills out the form. 4. The person submits the form by selecting a submit button. In response, the XFA processing application bundles the designated parts of the form into a PDF document and submits that document to a server. (This statement assumes a rather simple form submission process.)
Adding an XML digital signatures to a template
In this example, an XML digital signature is added to the template. Such a signature would be used for data integrity, by referencing the data object from the signature manifest. 1. A form designer creates a template. One of the elements in the template is a button associated with XML digital signature action (signData). 2. The designer defines the submission format as XDP. This is the format in which the form data and parts of the form are submitted to a server. After completing the form, the user selects a submit button. In response to this selection, the XFA processing application bundles the designated parts of the form into an XDP package and submits that package to a server. (This statement assumes a a simple form submission process.) 3. The designer saves the form as PDF or XDP. The following scenario applies when the form is being filled out. 1. The form is opened using an XFA processing application. 2. The person fills out the form. 3. The user submits the form by selecting a submit button. In response, the XFA processing application bundles the designated parts of the form into an XDP package and submits that package to a server. (This statement assumes a simple form submission process.)
Integrity
Digital signatures enable recipients to verify the integrity of an electronic document used in one-way or round-trip workflows. For example, when a digital signature is applied to a quarterly financial statement, recipients have more assurance that the financial information has not been altered since it was sent. A primer on electronic document security [ElectronicSecurity] describes methods for maintaining integrity. The following types of signatures are commonly used to support document integrity:
Ordinary signatures, which can associate a signer with part or all of the document. For example, a users signature may indicate approval of the data in certain fields of the form. Modification Detection and Prevention (MDP) signatures, which specify what changes are permitted to be made the document and what changes invalidate the authors signature. Usage rights (UR) signatures, which identify the authorizing agent and enable capabilities in special PDF-viewing applications.
The main differences between these signatures lies in what portions of the form are covered by the signature and what supplemental information is provided about each signer or signature. XFA provides all the necessary grammar to express any of these types of signature. However what types of signature are supported by a particular application is entirely application-defined. Individual XFA applications may support any, all, or none of the above types of signatures. For example, a non-interactive application might verify signatures but would probably never generate signatures. It is normal and expected that different signatures may cover overlapping portions of the form. For example, Susan fills out a request for vacation. Her signature signs the subform that she filled out. Her boss Henry then approves the request. Henrys signature signs the entire form, including the subform that Susan filled out. Any change to that subform invalidates both signatures.
Authenticity
Achieving this purpose results in a "trusted document" or a "document of record". Authenticity provides confidence that a document or part of a document does not take on a different appearance after being signed. The XFA grammar and the PDF language provide a number of capabilities that can make the rendered appearance of a form or PDF document vary. These capabilities could potentially be used to construct a document that misleads the recipient of a document, intentionally or unintentionally. These situations are relevant when considering the legal implications of a signed XFA form or PDF document. Therefore, it is necessary to have a mechanism by which a document recipient can determine whether the document can be trusted.
Non- Repudiability
Non-repudiation is a document security service that prevents the signer of the document from denying that they signed the document. Such a service is often driven by authentication and time-stamping from a trusted third-party. Non- repudiable security is the same as document of record, with the additional verification that the person signing the form cannot deny signing the form. Using PDF signatures to establish nonrepudiability is described in the PDF Reference [PDF] and in A primer on electronic document security [ElectronicSecurity]. Using XML digital signatures to establish non- repudiable documents is beyond the scope of this specification.
Signing a Form
An XFA processing application produces an XML digital signature in response to a user activating an event that contains a signData property with an operation property of "sign". Such an event is usually activated by the user clicking a button. In response to the event activation, an XFA processing application performs steps such as the following, although the exact steps are application-dependent: 1. Initiate a dialog with the person filling out the form to determine which of the users private certificates should be used to produce the signature. Typically certificates are used only when the application and handler specify a signature algorithm that supports a public key-based signature algorithm. Note: The following steps are paraphrased from Section 3.1.1, Reference Generation and Section 3.1.2, Signature Generation in [XMLDSIG-CORE], with additional information pertinent to the XFA signData element. 2. For each object being signed, apply the application-determined transforms, calculate the digest value over the resulting data object, and create a reference element. The XFA template signData element
specifies the objects being signed, as described Manifest: Data and other content digested by the signature handler on page 485. 3. Create the XML object (SignedInfo) that describes how the signature is being produced. This object includes a description of the canonicalization method, the signature method, any transform algorithms, and the digest method. 4. Canonicalize over the objects specified in Step 2. The canonicalization algorithm is application-defined. Canonicalization is used because not every alteration to an XML document has meaning. For example, it is irrelevant whether an element start tag is separated from the following attribute name by a single space, multiple spaces, a line feed, or any other valid white space. Naively signing every character in the document would mean that any change at all to the document, even a meaningless change, would void the signature. Rather a canonical copy of the document is extracted and the signature is generated or verified based on the canonicalized copy. The W3C specification Exclusive XML Canonicalization [EXCLUSIVE-XML-CANONICALIZATION] specifies a variety of canonicalization algorithms. 5. Calculate the signature value over the objects specified in Step 2. This is done by invoking the signature handler specified or by invoking an application-defined algorithm. If the signData element specifies a handler that is required, the XFA processing application is obliged to use the specified handler. A signature handler is usually third-party software that handles the raw signing operation. The XFA processing application invokes it after applying other transformations and after obtaining other information, such as certificates, used by the signature handler. The signature handler computes a hash value based upon a combination of the data included in the manifest and a (usually private) signing key. This value is the digital signature. 6. Construct the Signature element that includes SignedInfo, the signature value, and other information that allows the signature to later be verified or cleared. The signature object includes the computed hash and URIs identifying the certificates and certificate policies needed to verify the signature. It also includes a manifest that identifies each of the XML elements included in the signature. Although this manifest is derived from one originally specified as XFA-SOM expressions within an XFA manifest element, within the signature the manifest is expressed using [XPATH] expressions as required by the [XMLDSIG-CORE] specification. The signature also includes additional information, not mandated by [XMLDSIG-CORE], which is described below.
<signData>
<Signature>
Removing a Signature
An XFA processing application produces an XML digital signature in response to a user activating an event that contains a signData property with a operation property of "clear". Such an event is usually activated by the user clicking a button. In response to such an event being activated, the XFA processing application removes the signature signature by simply by stripping out the signature object. This can be done by anyone with access to the document. Hence, signatures are hard to apply (i.e. they require possession of private keys to apply) but they are easy to remove.
Verifying a Signature
An XFA processing application produces an XML digital signature in response to a user activating an event that contains a signData property with a operation property of "verify". Such an event is usually activated by the user clicking a button. In response to such an event being activated, the XFA processing application invokes the signature handler, specifying that signature verification is desired and supplying a pointer to the signature object.
part or all of any of the packets written out to XDP (XDP Specification on page 884). Such packets include dataSets, config, and localeSet. XML digital signatures adopt the mechanism specified by [XMLDSIG-CORE], which is an XML-specific mechanism. The signature handler digests the XML prior to being written out as XDP. This distinction is important relative to data, which has one form in the XFA Data DOM and another (possibly) different form in the XML Data DOM. Such differences exist for the following reasons:
XSLT transformations which may be applied when loading or saving the XML Data Document. Use of these transformations is described in XSLT Transformations on page 469. Before rich text in the XML Data DOM is brought into the XFA Data DOM, it is converted into plain text. This separation is described in Representing Rich Text in the XFA Data DOM on page 194. Hypertext references to images in rich text are resolved in the XFA Form DOM, but not in the XML Data DOM. As a result, the data in such references is omitted even if the entire form is included in the manifest.
It is an error to specify a manifest for an XML digital signature that includes a node that is not written out. For example, the manifest must name neither data nodes that are marked transient nor other form properties that are never written out.
Signature destination
The signData ref property specifies the location where the Signature element is to be stored (if the signData operation is "create") or has been stored (if the signData operation is "clear" or "verify"). The signature can be place anywhere that a SOM expression can reach. However it is recommended that Signature elements be placed within the datasets element, but outside the data element which is the child of datasets. Multiple sibling Signature elements can be accommodated. The signatures are distinguished by XML ID, not by element name, in keeping with the dictates of [XMLDSIG-CORE]. See The datasets Element (an XDP Packet) on page 891. Occasionally, it is necessary to place a signature in a location that will not travel with the data. In this case Signature elements may be placed as XDP packets, that is, as children of the XDPs root xdp element. See The signature Element (an XDP Packet) on page 893.
The reason for signing must be selected from a list of possible reasons which is descended from the reasons subproperty of the filter property of the signData object. For example, assume the template contains the following fragment.
... <filter> <reasons ...> <reason>Requested</reason> <reason>Approved</reason> <reasons> </filter> </signData> </event> </field>
Then the additional information inserted into the XML digital signature could look like this:
<Signature Id=mySIg xmlns="http://www.w3.org/2000/09/xmldsig#"> <SignedInfo> ... <Object> <SignatureProperties> <SignatureProperty ...> <x:xmpmeta xmlns:x='adobe:ns:meta/'> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"> <rdf:Description rdf:about="" xmlns:xmp="ns.adobe.com/xap/1.0/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xfa="http://www.xfa.org/schema/xfa-template/2.6/"> <xmp:CreateDate>2005-08-15T17:10:04Z</xmp:CreateDate> <dc:description>Approved</dc:description> </rdf:Description> </rdf:RDF> </x:xmpmeta> </SignatureProperty> </SignatureProperties> </Object> </SignedInfo> </Signature>
Example
The following form presents buttons for signing, verifying, and unsigning the form. The signature includes the root element of the data document and all of its content, but nothing else. When the signature is present it is enclosed in an element called signatures which is placed within the datasets element. Note the use of a prototype to avoid repeating information in each signData element.
<button/> </ui> <caption> <value> <text>Sign the data</text> </value> </caption> <bind match="none"/> <event activity="click"> <signData operation="sign" use="#mySignData"/> </event> </field> <field name="Verify" ...> <ui> <button/> </ui> <caption> <value> <text>Verify the signature</text> </value> </caption> <bind match="none"/> <event activity="click"> <signData operation="verify" use="#mySignData"/> </event> </field> <field name="Clear" > <ui> <button/> </ui> <caption> <value> <text>Remove the signature</text> </value> </caption> <bind match="none"/> <event activity="click"> <signData operation="clear" use="#mySignData"/> </event> </field> </subform> <proto> <signData id="mySignData" target="mySignature" ref="!signatures"> <manifest> <ref>$data.form1</ref> </manifest> <filter> <handler version="" type="required"></handler> <reasons type="required"> <reason></reason> </reasons> <certificates url="MyCertURL"> <signing type="optional"> <certificate></certificate>
</signing> <issuers type="required"> <certificate></certificate> </issuers> <oids type="optional"> <oid></oid> </oids> </certificates> </filter> </signData> </proto> </subform> </template>
PDF Signatures
PDF signatures can be applied to the XFA form itself or to a separate document which accompanies submitted data.
changes to the XFA form without voiding the signature. For example, changing a space to a tab in between an element tag and the following attribute name voids the signature, even though it does not change the meaning of the XML.
Resolve external prototypes. Put external images inline. Include definitions for all required locales. Include all non-default configuration settings.
Fields containing rich text may contain image elements which reference external images. Such elements are not required to be respected as rich text markup, however XFA processors may still parse the image element and inspect the target of the URI. However to preclude portability problems XFA processors refrain from following such URIs outside the package, as described in Image Data on page 133. The requirements for archiving are similar to the requirements for portability but more stringent. For example, a non-archival document might rely on the default settings for a well-known locale. However an archival document must specify definitions for all the locales it uses because locale definitions change from time to time. When the name of the national currency changes, and possibly at the same time its value, the archived document must not automatically pick up the new currency while retaining the old numbers! Because XFA is intended for use in financial transactions we recommend adhering to the tougher archival standard for all XFA forms packaged as PDF files. Ideally one would wish to include all known locales in every form but this is not practical because each locale definition adds about 3 kilobytes and there are hundreds of locales defined. Instead the form should include definitions for all locales in which the form might be used.
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Template Specification
This chapter is the language specification for the XFA template syntax. The reference portion of this specification with syntax descriptions begins on page 499.
XFA Profiles
Starting with XFA 2.5 there is a facility to specify that a form uses a subset of the full XFA capability. This is indicated in the template element by a non-default value for the baseProfile attribute. Currently the only specified value is interactiveForms, which corresponds to the XFAF subset. When the template element specifies a profile, the contents of the template must be restricted to the set of elements and attributes allowed by that profile. For the restrictions of the XFAF profile see Grammar Excluded from XFAF on page 240. Note: The XFA Schema attached to this document in Schemas on page 1228 is defined for the full XFA grammar. It will not detect the presence of elements or attributes that are not appropriate for the profile specified by the form.
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<fill Properties: id="xml-id" presence="visible | invisible | hidden" use="cdata" > <color> [0..1] > One-of properties: <linear> [0..1] <pattern> [0..1] <radial> [0..1] <solid> [0..1] <stipple> [0..1] Children: <extras> [0..n] </fill>
An italicized type name is a placeholder for a value of the given type. Non-italicized words are enumerated values. All the allowed values are listed. Underlined words indicate the default value. The application uses this value if the attribute is omitted. Element names are black. Attribute names are green. Comments are blue italic. [min..max] shows the allowed number of occurrences within the element. The value n indicates no maximum.
Caution: Sometimes an attribute or child element is only useable in some contexts, but there is no indication of this in the syntax definition. Where appropriate such limitations are described in the textual description of the attribute or child element. The XFA schemas do not enforce these contextual limitations. Instead XFA processors ignore out-of-context attributes and child elements, optionally emitting warnings. All elements and attributes described in this specification, unless otherwise indicated, belong to the following namespace:
http://www.xfa.org/schema/xfa-template/2.6/
Properties
As in object-oriented programming, properties describe the objects to which they are attached. A property represents a logical grouping of information that may be represented as a single attribute or as as a tree structure of elements. A property includes all the information contained in the elements and attributes used to represent it. Properties may be unstructured or structured; XFA-Template uses attributes to describe unstructured properties and child elements to describe structured properties. For example, the fill elements
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attributes (see above syntax) are all unstructured properties, while its color element is a structured property. All properties must be in the XFA template namespace to be included in the template DOM. That is, the XFA template grammar cannot be extended through the use of custom namespaces. However, the XFA template grammar provides extras elements that can be used for extensions. The element descriptions in the template syntax reference differentiate between (regular) properties and one-of properties, as shown in the example on the previous page.
Regular Properties
Regular properties can be added to the element without regard to other properties in the element. The element descriptions in this specification use the term Property to identify such regular properties. In the case of elements, occurrence constraints must be honored.
One-of Properties
There are occasions where an element supports mutually-exclusive properties. For unstructured properties, an attribute enumeration represents the mutually-exclusive values, and these are not distinguished from regular properties. However, for structured properties, the entire structures are likely mutually-exclusive. The element descriptions in this specification use the term One-of property to identify mutually-exclusive, structured properties. The element must hold at most one of the allowed one-of property child elements. In the fill element example at the beginning of this chapter, the linear, pattern, radial, solid and stipple elements are mutually-exclusive, having been identified as One-of properties.
Property Defaults
The processing application must supply defaults for properties omitted from an element, using the following guidelines:
Regular properties. The processing application must provide the default values indicated in the element descriptions in this specification. One-of properties. The processing application must provide one of the properties as a default. That is, the absence of any one-of child elements implies the application must provide a default.
Children
Elements in the Children category don't represent properties at all. They represent tangible objects that often have the capability to contain each other and often are indeed called containers. Examples of such children include the field and subform elements. A subform element has a variety of attributes and child elements that represent the properties of the subform itself. Additionally, the subform may enclose a number of child elements that express children of the subform, such as fields, draws, or other subforms. The distinction between child elements that are (structured) properties and those that are true children is intentional. While all properties could be expressed as attributes, the attribute proliferation required to describe a deep structure would be overwhelming. Property child elements tend to be singly occurring, or occurring in known numbers (e.g., four edges in a border).
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Element Occurrence
Singly Occurring Elements
Elements that are defined as singly occurring [0..1] are permitted to be defined only once within the scope of the enclosing element. Unless stated otherwise all elements are singly occurring. Singly occurring elements usually each represent a property of the enclosing element, rather than an object aggregated by the enclosing element. Observe the following example of a filled white rectangle, with rounded corners and alternating solid and dashed edges.
In the example above, we see a single fill element. The fill element is specified as a [0..1] occurrence child of rectangle, and therefore it can only legally occur once or not at all in that position. Observe the following incorrect adaptation of the previous example of a white rectangle.
In the example above, the rectangle element incorrectly contains two fill elements. It makes no difference whether or not they are contiguous. All that matters is that they are both children of the same rectangle element. If the processing application encounters such an XFA Template that expresses an excessive number of a given element, the processing application may consider this an error or continue processing. If the application chooses to continue processing, it must accept only the first occurrence of the given element. Therefore, in this example the rectangle would have a fill of white (color value of 255,255,255).
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In the example above, we see that the edge element has been multiply specified within the rectangle element. The edge and corner elements are both specified as [0..4] occurrence XFA element types, and so both edge elements contribute to the definition of some part of the rectangle. When more multiply occurring elements are present than required, the XFA processor uses the maximum allowed number of elements from the beginning of the set. Observe the following adaptation of the previous example.
In the example above, we see that the edge element has been multiply specified inside the rectangle element for a total of six edge elements. The element specification for the rectangle element decrees that there may be up to four edges specified for a rectangle. Therefore, only the first four occurrences of the edge element are accepted. The last two edge elements (both of which specify a stroke of dotted) do not contribute to the rectangle.
Processing Instructions
Processing instructions are not formally part of the schema. They contain information which is of use to particular applications and may be ignored by others. However several processing instructions have conventional meanings in an XFA template. These processing instructions are discussed in the descriptive
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text for the element in which they are enclosed. XML also allows for processing instructions located at the head of the document, not enclosed in any element, but this reference chapter by definition does not discuss anything that is outside the template packet. As a matter of style processing instructions are conventionally placed ahead of any other content within the enclosing element.
Template Reference
The arc element
A curve that can be used for describing either an arc or an ellipse.
<arc Properties: circular="0 | 1" hand="even | left | right" id="cdata" startAngle="0 | angle" sweepAngle="360 | angle" use="cdata" usehref="cdata" > <edge/> <fill/> </arc> [0..1] [0..1]
The arc element is used within the following other elements: proto value Unlike borders and rectangles, the path of an arc follows a counter-clockwise direction. This has implications for handedness. In particular, an arc with a left-handed edge will render the edge's thickness just inside the path, while left-handed borders and rectangles render the thickness just outside the path. Similarly, an arc with a right-handed edge will render the edge's thickness just outside the path, while right-handed borders and rectangles render the thickness just inside the path.
The arc will be adjusted to a circular path. The default value of this property is 0. Setting this property to 1 causes the arc to become circular, even if the content region into which the arc is being placed is not square. When forced into a circle, the radius is equal to the smaller dimension of the content region.
Position the displayed line immediately to the left of the underlying vector or arc, when following that line from its start point to its end point.
right
Position the displayed line immediately to the right of the underlying vector or arc, when following that line from its start point to its end point.
The id property
A unique identifier that may be used to identify this element as a target.
The area element is used within the following other elements: area pageArea proto subform
The id property
A unique identifier that may be used to identify this element as a target.
The x property
X coordinate of the container's anchor point relative to the top-left corner of the parent container's nominal content region when placed with positioned layout. Defaults to 0.
The y property
Y coordinate of the container's anchor point relative to the top-left corner of the parent container's nominal content region when placed with positioned layout. Defaults to 0.
The assist element is used within the following other elements: draw exclGroup field proto subform The assist element provides a means to specify the tool tip and behavior for a spoken prompt.
The id property
A unique identifier that may be used to identify this element as a target.
The barcode element is used within the following other elements: proto ui The barcode element supplies the information required to display a barcode. This includes the type of the barcode and a set of options which varies from one type of barcode to another. For more information about using this element see the chapter Using Barcodes.
The characters are encoded using Unicode code points as defined by [Unicode-3.2], and UTF-8 serialization as defined by ISO/IEC 10646 [ISO-10646]. There is no byte order mark.
none
No special encoding is specified. The characters are encoded using the ambient encoding for the operating system.
ISO-8859-1
The characters are encoded using ISO-8859-1 [ISO-8859-1], also known as Latin-1.
ISO-8859-2
The characters are encoded using JIS X 0208, more commonly known as Shift-JIS [Shift-JIS].
KSC-5601
The characters are encoded using the Code for Information Interchange (Hangul and Hanja) [KSC5601].
Big-Five
The characters are encoded using Traditional Chinese (Big-Five). Note: there is no official standard for Big-Five and several variants are in use. XFA uses the variant implemented by Microsoft as code page 950 [Code-Page-950].
GB-2312
The characters are encoded using Unicode code points as defined by [Unicode-3.2], and UTF-16 serialization as defined by ISO/IEC 10646 [ISO-10646]. There is no byte order mark.
UCS-2
The characters are encoded using Unicode code points as defined by [Unicode 3.2], and UCS-2 serialization as defined by ISO/IEC 10646 [ISO-10646]. There is no byte order mark.
fontSpecific
The characters are encoded in a font-specific way. Each character is represented by one 8-bit byte. The font referred to is font property of the enclosing field or draw.
Do not insert a checksum. This is the default and is always allowed (but may be ignored).
auto
Insert the default checksum for the barcode format. Always allowed.
1mod10
Insert a "1 modulo 10" checksum followed by a "1 modulo 11" checksum. "1 modulo 10", "2 modulo 10", and "1 modulo 11" are defined in barcode standards documents for the barcodes to which they apply.
Write out a header consisting of a byte with decimal value 129 (0x81 hex) followed by another byte with decimal value 1. Then write the data compressed using the Flate algorithm, as defined by the Internet Engineering Task Force (IETF) in [ RFC 1951]. No predictor algorithm is used. It is an error to specify this option with a type that cannot encode arbitrary binary data.
fixed. If the supplied data does not fill the barcode the remaining cells are padded out with padding symbols.
The id property
A unique identifier that may be used to identify this element as a target.
For 2-d barcodes the value of this property determines the module width. A module is a set of bars encoding one symbol. Usually a symbol corresponds to a character of supplied data. The allowable range of widths varies from one barcode format to another. The template must not specify a value outside the allowable range. The default value for this property (0.25mm) is not useful for 2-d barcodes.
Do not print the check digit in the human-readable text, only in the barcode itself. This is the default.
1
Text is partially embedded in the bottom of the barcode. The baseline of the text is aligned with the bottom of the bars.
aboveEmbedded
Text is partially embedded at the top of the barcode. The top of the text is aligned with the top of the bars.
none
No text is displayed.
Code 39 (also known as code 3 of 9), as defined in ANSI/AIM BC1-1995, USS Code 39 [ Code39].
code3Of9extended
code128
Code 128 serial shipping container code, as defined in ANSI/AIM BC4-1995, ISS Code 128 [Code128-1995].
ean8
United States Postal Service FIM (Facing Identification Mark), as described in First-Class Mail [USPS-C100].
logmars
Logmars (Logistics Applications of Automated Marking and Reading Symbols) as defined by U.S. Military Standard MIL-STD-1189B [LOGMARS].
maxicode
MSI (modified Plessey); may have once had a formal specification but not any longer.
pdf417
PDF417, but allowing the data to span multiple PDF417 bar codes. The barcode(s) are marked so that the barcode reader knows when it still has additional barcodes to read, and can if necessary prompt the operator. This facility is defined in "USS PDF417" [PDF417].
plessey
Australian Postal Reply Paid, as defined in Customer Barcoding Technical Specifications [APO-Barcode].
postAUSStandard
United Kingdom RM4SCC (Royal Mail 4-State Customer Code), as defined in the How to Use Mailsort Guide [RM4SCC].
postUSDPBC
United States Postal Service Delivery Point Bar Code, as defined in DMM C840 Barcoding Standards for Letters and Flats [USPS-C840].
postUSStandard
United States Postal Service POSTNET barcode (Zip+4), as defined in DMM C840 Barcoding Standards for Letters and Flats [USPS-C840].
postUSZip
United States Postal Service POSTNET barcode (5 digit Zip), as defined in DMM C840 Barcoding Standards for Letters and Flats [USPS-C840].
qr
ucc128
UCC/EAN 128, as defined in International Symbology Specification - Code 128 (1999) [Code128-1999].
ucc128random
UCC/EAN 128 Random Weight, as defined in International Symbology Specification - Code 128 (1999) [Code128-1999].
ucc128sscc
UCC/EAN 128 serial shipping container code (SSCC), as defined in International Symbology Specification - Code 128 (1999) [Code128-1999].
upcA
standardSymbol
Non-shipping encoded information with more error correction than standardSymbol. This is limited to about 74 characters of user data.
The bind element is used within the following other elements: exclGroup field subform
The node representing the enclosing element will bind to a node in the XFA Data DOM in accordance with the standard matching rules.
none
The node representing the enclosing element is transient. It will not be bound to any node in the XFA Data DOM.
global
The containing field is global. If the normal matching rules fail to provide a match for it, the data-binding process will look outside the current record for data to bind to the field.
dataRef
The containing field will bind to the node in the XFA Data DOM specified by the accompanying ref attribute. See Basic Data Binding to Produce the XFA Form DOM for more information about, and an authoritative definition of, the effects of this property.
The bindItems element is used within the following other elements: field proto This element builds the items list for a choicelist or a set of check boxes or radio buttons. However unlike the items element this element gets the data from the Data DOM or from a connection to a web service.
The bookend element is used within the following other elements: proto subform subformSet
The id property
A unique identifier that may be used to identify this element as a target.
The boolean element is used within the following other elements: desc exObject extras items proto value variables
Content
The content must be one of the following:
0
The content represents a logical value of true. When no content is present, the content shall be interpreted as representing a null value, irrespective of the value of the associated nullType property in the data description.
The id property
A unique identifier that may be used to identify this element as a target.
The border element is used within the following other elements: checkButton choiceList dateTimeEdit draw exclGroup field imageEdit numericEdit passwordEdit proto signature subform textEdit The edges of a border are rendered in a clockwise fashion, starting from the top left corner. This has implications for the border's handedness. In particular, a left-handed stroke will appear immediately outside the rectangle's edge, while a right-handed edge will appear immediately inside. Such behavior is consistent with rectangles, but not arcs.
The border is open on each side of a page break. The same behavior is maintained if the object breaks across multiple pages or content areas. Thus if the value is open the border is reduced, for pages or content areas in the middle, to just a left and right border.
Position the displayed line immediately to the left of the underlying vector or arc, when following that line from its start point to its end point.
right
Position the displayed line immediately to the right of the underlying vector or arc, when following that line from its start point to its end point.
The id property
A unique identifier that may be used to identify this element as a target.
Make it visible.
invisible
If a container is excluded, it is not considered in the data binding process. See also Concealing Containers Depending on View and Config Specification.
The break element is used within the following other elements: proto subform subformSet As of XFA 2.4 this element has been deprecated. New designs should use the overflow, bookend, breakBefore, and/or breakAfter elements instead.
The determination of a transition to a new page or content area will be delegated to the processing application. No transition to a new page or content area will be forced.
contentArea
The determination of a transition to a new page or content area will be delegated to the processing application. No transition to a new page or content area will be forced.
contentArea
Rendering will transition the next available content area. See also the startNew attribute.
pageArea
The id property
A unique identifier that may be used to identify this element as a target.
Do not start a new content area or page area if the current one has the specified name.
1
Always start a new content area or page. The name of the content area or page is supplied by the accompanying beforeTarget attribute.
The breakAfter element is used within the following other elements: proto subform subformSet When layout of the parent object is complete and this element contains a non-empty script the script is evaluated. If the script returns false no break occurs and layout proceeds using the current layout container. However if the script returns true, or if there is no script, or the script is empty, a break occurs and various actions occur under control of the other properties of this element.
The id property
A unique identifier that may be used to identify this element as a target.
If the current layout container matches the target specification continue filling the same container. Only start a new layout container when the current one does not match the target specification.
1
Layout transitions to a new page. Note that this replaces the after attribute on the deprecated break element.
The breakBefore element is used within the following other elements: proto subform subformSet When layout of the parent object is about to start and this element contains a non-empty script the script is evaluated. If the script returns false no break occurs and layout proceeds using the current layout container. However if the script returns true, or if there is no script, or the script is empty, a break occurs and various actions occur under control of the other properties of this element.
The id property
A unique identifier that may be used to identify this element as a target.
If the current layout container matches the target specification continue filling the same container. Only start a new layout container when the current one does not match the target specification.
1
Layout transitions to a new page. Note that this replaces the before attribute on the deprecated break element.
The button element is used within the following other elements: proto ui
The button presents an appearance similar to a mechanical button being pushed. It has three appearances, up (inactive), down (active) and rollover (highlighted but retaining its current state unless and until toggled by a mouse click).
inverted
The button (within the frame) is inverted in shading and/or color when activated. There is no special rollover appearance.
none
There is no special change in graphic appearance when activated. The only change is that specified by the mark attribute of the associated checkButton element. There is no special rollover appearance.
outline
The frame of the button is inverted in shading and/or color when activated. There is no special rollover appearance. When (and only when) push mode is selected, alternate captions may be specified for the down and rollover states. The alternate captions are specified using an items list containing named items. The item named "down", if present, is used in the down state and the item named "rollover", if present, is used in the rollover state. For example,
<field> <ui> <button/>
</ui> <caption> <value><text> Up Text </text></value> </caption> <items> <text name="down"> Down Text </text> <text name="rollover"> Rollover Text </text> </items> </field>
The id property
A unique identifier that may be used to identify this element as a target.
The calculate element is used within the following other elements: exclGroup field proto subform
The id property
A unique identifier that may be used to identify this element as a target.
The calculation is disabled. This is the default when the XML representation of the field does not include a calculate element. In an interactive context the user is free to enter data into the field. The effect of this override value is independent of user action. The disabled value allows an event script to dynamically enable/disable a calculate element.
error
The calculation is enabled. This is the default when the XML representation of the field does include a calculate element. The processing application must not change the calculated value with any user-supplied values. User attempts to directly set the value derived by a calculate
object having an error override causes the processing application to present an error message. To avoid the need for such error messages, form creators may wish to define such fields as read-only.
ignore
The calculated value is mandatory. The processing application ignores any attempt by the user to set the value of the form object.
warning
The calculation is enabled, and the calculated value is recommended over user-supplied values. If the user takes action to directly set the value of the form object, the processing application presents a warning message. The message informs the user that the form object is recommended to have a calculated value, and provides the user with two choices: dismiss or override. Users select dismiss to indicate they wish to leave the calculated value undisturbed. Users select override to indicate they understand the form's recommendation, but have chosen to override the calculated value with a value of their choosing. The application does not issue any warnings or prompts on subsequent gain of focus by the same object.
The caption element is used within the following other elements: draw exclGroup field proto
The id property
A unique identifier that may be used to identify this element as a target.
The caption is located to the left of the content in a rectangular region that spans the height of the margined nominal extent.
right
The caption is located to the right of the content in a rectangular region that spans the height of the margined nominal extent.
top
The caption is located above the content in a rectangular region that spans the width of the margined nominal extent.
bottom
The caption is located below the content in a rectangular region that spans the width of the margined nominal extent.
inline
The caption appears inline with, and prior to, the text content.
Make it visible.
invisible
The XML ID or SOM expression is resolved in the context of the external document. If both use and usehref are non-empty usehref takes precedence.
The certificate element is used within the following other elements: encrypt issuers proto signing A certificate binds a person or entity to a specific public key. 509v3 certificates are described in RFC 3280, Internet X.509 Public Key Infrastructure, Certificate and Certificate Revocation List (CRL) Profile [RFC3280].
Content
A Base64 DER-encoded X.509v3 certificate. Depending upon the context this element can contain a certificate holding either a public key or a private key. When used for encryption, as a property of a barcodeelement, the certificate holds a public key. When used for authenticating a signing certificate, as a property of an issuerselement, it also holds a public key. But when used for signing, as a property of a signing element, it holds a private key.
The id property
A unique identifier that may be used to identify this element as a target.
The certificates element is used within the following other elements: filter proto The certificates element identifies certificates used for Public Key Infrastructure (PKI), including signing certificates, issuer certificates, and object IDs. Issuer certificates and object IDs are used to verify the signing certificate is valid. PKI information allows the document recipient to determine whether or not a specific public key really belongs to a specific individual. X.509v3 certificates are described in RFC 3280, Internet X.509 Public Key Infrastructure, Certificate and Certificate Revocation List (CRL) Profile [RFC3280]. The document "A primer on electronic security" [ElectronicSecurity] provides a more basic explanation of the roles of certificates in signer identification.
The id property
A unique identifier that may be used to identify this element as a target.
A server where the user can enrol via browser for a new credential. The equivalent in PDF is an "urlType" of "Browser".
roamingCredentialServer
A signature web service for server-based signing. The equivalent in PDF is an "urlType" of "ASSP".
userDefinedString
Third parties can extend the meaning with custom values. The custom values must conform to the guidelines described in appendix E of the PDF Manual.
The checkButton element is used within the following other elements: proto ui
The id property
A unique identifier that may be used to identify this element as a target.
The asserted appearance matches the unasserted appearance, as controlled by the shape attribute. If the unasserted appearance is a square outline then the asserted appearance is a corner to corner X. If the unasserted appearance is a circular outline then the asserted appearance is a filled circle.
check
cross
The asserted appearance is a filled star. These descriptions are deliberately vague to allow latitude for the application. For example when presenting on glass the filled circle might appear as a glowing light whereas when presenting on paper it would probably appear as a flat black circle taken from a font.
The checkButton appears as a square outline. This is usually used to represent an unchecked box.
round
The CheckButton appears as a circular outline. This is usually used to represent an unpressed radio-button.
The choiceList element is used within the following other elements: proto ui
When the user clicks choice-list data with the mouse, the selected data value is written to the XFA Data DOM. Alternatively, if the user presses the enter key after previously using other keyboard sequences to shift focus to a particular entry in the choice list, the selected data is written to the XFA Data DOM.
Note: Having a choice list commit data as soon as selections are made may be important in forms that contain non-XFA interactive features, such as Acrobat annotations or hypertext links. People filling out such forms may erroneously believe that selecting an item from a choice list followed by clicking a non-XFA interactive feature is the same as exiting the check list. In fact, the check list remains the field in focus.
exit
The selected data is not written to the XFA Data DOM until the field loses focus. This is the recommended setting for choice lists that support multiple selections (open="multiSelect").
The id property
A unique identifier that may be used to identify this element as a target.
The list drops down when the user clicks on a button or makes some other appropriate gesture. It disappears when the cursor moves outside the list or some other appropriate user-interface event occurs.
onEntry
The list drops down on entry into the field. It disappears upon exit from the field.
always
The user may select multiple entries from the list, by holding down the shift key while making selections. The list of choices is displayed whenever the field is visible.
The user is not allowed to type. The value must be chosen by selecting from the drop-down list.
1
The user is allowed to type or select from the drop-down list. This opens up the field value to be anything that the user might type; the list becomes more like a set of hints. If the open attribute is set to multiSelect, the user is not allowed to enter values in the widget.
The color element is used within the following other elements: corner edge fill linear pattern proto radial stipple
The id property
A unique identifier that may be used to identify this element as a target.
range 0 through 255, inclusive. 255 represents maximum display intensity. For example, 255,0,0 specifies the color red. The default is dependent upon the context of where the color is used; the default color is determined by the object enclosing the color element.
The comb element is used within the following other elements: dateTimeEdit numericEdit proto textEdit Comb fields must be single-line fields and do not support scrolling.
Each tine of the comb is the full height of the field. Each tine's color and width is that defined for the widget border's third (bottom) edge. Rich text is not supported in comb fields. Comb fields must have the corresponding border handedness set to right. This follows from the fact that left-handed borders by definition are entirely outside the field region, while even-handed borders are equally inside and outside. To be useful the comb has to be inside the field region.
The id property
A unique identifier that may be used to identify this element as a target.
The connect element is used within the following other elements: exclGroup field proto subform
The id property
A unique identifier that may be used to identify this element as a target.
value of this property is a normal XFA SOM expression. See the XFA-Scripting Object Model Expression Specification [XFA SOM] for more information about XFA SOM expressions.
Used during both import and export. This value is allowed both for connections to web services and connections to XML data documents.
exportOnly
Used during export, ignored during import. This value is only allowed for connections to web services.
importOnly
Used during import, ignored during export. This value is only allowed for connections to web services.
The contentArea element is used within the following other elements: pageArea proto
The h property
Height for layout purposes. A measurement value for h overrides any growth range allowed by the minH and maxH attributes. The absolute omission of this attribute or a value specified as an empty string indicates that the minH and maxH must be respected. This attribute has no default. Setting this attribute to "-1" is an error.
The id property
A unique identifier that may be used to identify this element as a target.
element should be included in that particular view. A token of the form -viewname indicates the element should be excluded from that particular view. If a container is excluded, it is not considered in the data binding process. See also Concealing Containers Depending on View and Config Specification.
The w property
Width for layout purposes. A measurement value for w overrides any growth range allowed by the minW and maxW attributes. The absolute omission of this attribute or a value specified as an empty string indicates that the minW and maxW must be respected. This attribute has no default. Setting this attribute to "-1" is an error.
The x property
X coordinate of the container's anchor point relative to the top-left corner of the parent container's nominal content region when placed with positioned layout. Defaults to 0.
The y property
Y coordinate of the container's anchor point relative to the top-left corner of the parent container's nominal content region when placed with positioned layout. Defaults to 0.
The corner element is used within the following other elements: border proto rectangle In addition to properties of the corner element, the handedness specification of the enclosing element also influences the appearance of the corner. In turn, the corner exerts some influence over the appearance of the edges it draws, particularly through its radius property. The default color for a corner if black.
The id property
A unique identifier that may be used to identify this element as a target.
The corner has the shape of a right-angle between the adjoining edges.
round
The corner has the shape of a round curve between the adjoining edges.
Make it visible.
invisible
Solid.
dashed
lowered
The date element is used within the following other elements: desc exObject extras items proto value variables XFA dates conform to a subset of ISO-8601, as specified in Canonical Format Reference. This element is intended to hold a date only to the resolution of a single day and any date information beyond that resolution will be truncated. For instance, a date element enclosing the value 20010326T0630, meaning 6:30am on March 26th 2001, will truncate the time and hold the value of 20010326, resulting in a value of March 26th 2001.
Content
This element may enclose date data which is a subset of [ISO-8601] as specified in Canonical Format Reference. When no content is present, the content shall be interpreted as representing a null value, irrespective of the value of the associtated nullType property in the data description.
The id property
A unique identifier that may be used to identify this element as a target.
The dateTime element is used within the following other elements: desc exObject extras items proto value variables
Content
This element may enclose date/time data which is a subset of [ISO-8601] as specified in Canonical Format Reference. When no content is present, the content shall be interpreted as representing a null value, irrespective of the value of the associtated nullType property in the data description.
The id property
A unique identifier that may be used to identify this element as a target.
The dateTimeEdit element is used within the following other elements: proto ui
If the field is single-line it scrolls horizontally. Multi-line fields do not scroll horizontally.
on
A horizontal scroll bar is always displayed whether or not the input overflows the boundaries of the field. The field is scrollable regardless of whether it is a single-line or multi-line field.
off
The user is not allowed to enter characters beyond what can physically fit in the field width. This applies to typing and pasting from the clipboard. However data which is merged into the field from the Data DOM is not restricted. If the data exceeds the field size the user may not be able to view all of it. Note that Acrobat does not implement the value on. If this value is encountered it is treated as auto.
The id property
A unique identifier that may be used to identify this element as a target.
The decimal element is used within the following other elements: desc exObject extras items proto value variables Note that the decimal element and the float element differ only in the user interface. They are interchangeable in every other way.
Content
This element may enclose decimal-data which is an optional leading minus sign (Unicode character U+002D), followed by a sequence of decimal digits (Unicode characters U+0030 - U+0039) separated by a single period (Unicode character U+002E) as a decimal indicator. To maximize the potential for data interchange, the decimal point is defined as '.' (Unicode character U+002E). No thousands/grouping separator, or other formatting characters, are permitted in the data. The template may specify a picture clause to provide a presentation more suitable for human consumption. When no content is present, the content shall be interpreted as representing a null value, irrespective of the value of the associtated nullType property in the data description.
The id property
A unique identifier that may be used to identify this element as a target.
The defaultUi element is used within the following other elements: proto ui When the depiction of the widget is defaulted this element is used. In this mode the appearance and interaction of the widget is determined by examining the content of the field. For example, if the content is a number then a numeric editing widget is used. This element can also supply additional hints to a custom GUI via its extras child.
The id property
A unique identifier that may be used to identify this element as a target.
The desc element is used within the following other elements: area contentArea draw exclGroup field pageArea proto subform subformSet
The id property
A unique identifier that may be used to identify this element as a target.
The digestMethod element is used within the following other elements: digestMethods proto
Content
One of the following values:
SHA1
The id property
A unique identifier that may be used to identify this element as a target.
The digestMethods element is used within the following other elements: filter proto
The id property
A unique identifier that may be used to identify this element as a target.
The values provided in the element are optional seed values from which the XFA processing application may choose. The XFA processing application may also supply its own value.
required
The values provided in the element are seed values from which the XFA processing application must choose.
The draw element is used within the following other elements: area pageArea proto subform Note that although all draw elements have minH, maxH, minW and maxH properties, not all draws are growable. Draw elements that are not growable ignore these properties. Draw elements with the following content types cannot grow:
line
The h property
Height for layout purposes. A measurement value for h overrides any growth range allowed by the minH and maxH attributes. The absolute omission of this attribute or a value specified as an empty string indicates that the minH and maxH must be respected. This attribute has no default. Setting this attribute to "-1" is an error.
The id property
A unique identifier that may be used to identify this element as a target.
A valid locale name that conforms to the syntax: language[_country]. Examples of valid locales are zh for Chinese and en_CA for English specific for Canada. For a complete list of valid locale values, refer to the IETF RFC 1766 [RFC1766] and ISO 639 [ISO-639-1] / ISO 3166 [ISO-3166-1] specifications. Note that this is the same set of locale names used by the xml:lang attribute defined in [XML1.0]. When this property is absent or empty the default behavior is to inherit the parent object's locale. If the outermost subform does not specify a locale it uses the ambient locale from the operating system. If the operating system does not supply a locale it falls back onto en_US.
Make it visible.
invisible
element should be included in that particular view. A token of the form -viewname indicates the element should be excluded from that particular view. If a container is excluded, it is not considered in the data binding process. See also Concealing Containers Depending on View and Config Specification.
The ui property
A user-interface element that encloses the actual user interface widget element.
The w property
Width for layout purposes. A measurement value for w overrides any growth range allowed by the minW and maxW attributes. The absolute omission of this attribute or a value specified as an empty string indicates that the minW and maxW must be respected. This attribute has no default. Setting this attribute to "-1" is an error.
The x property
X coordinate of the container's anchor point relative to the top-left corner of the parent container's nominal content region when placed with positioned layout. Defaults to 0.
The y property
Y coordinate of the container's anchor point relative to the top-left corner of the parent container's nominal content region when placed with positioned layout. Defaults to 0.
The edge element is used within the following other elements: arc border line proto rectangle The properties here influence the appearance of the edge. In addition, the handedness of the enclosing element influences the edge's appearance. When an edge is part of a border or rectangle, the sibling corner elements exert some influence over the appearance of edges. In particular, each edge is trimmed back from its endpoints by the corner radius in effect at that endpoint, irrespective of whether the corner is round or square, inverted or not, and visible or invisible. The default edge color is black.
The stroke shall be terminated by rendering the end of the edge squarely beyond the edge's endpoint a distance equal to one-half the edge's thickness.
butt
The stroke shall be terminated by rendering the end of the edge squarely across the endpoint.
round
The stroke shall be terminated by rendering the end of the edge with a semi-circle at the edge's endpoint, having a radius equal to one-half the edge's thickness.
The id property
A unique identifier that may be used to identify this element as a target.
Make it visible.
invisible
Solid.
dashed
The encoding element is used within the following other elements: encodings proto This element corresponds to the subFilters element in PDFL.
Content
A signature encoding recipe name. Certain names have been assigned by Adobe but other security handlers may define their own. The names assigned by Adobe are:
adbe.x509.rsa_sha1 adbe.pkcs7.detached adbe.pkcs7.sha1
The id property
A unique identifier that may be used to identify this element as a target.
The encodings element is used within the following other elements: filter proto
The id property
A unique identifier that may be used to identify this element as a target.
The values provided in the element are optional seed values from which the XFA processing application may choose. The XFA processing application may also supply its own value.
required
The values provided in the element are seed values from which the XFA processing application must choose.
The encrypt element is used within the following other elements: barcode proto submit The presence of this element with its content causes the data to be encrypted before writing it to the barcode or submitting it to the host. If this element is absent or empty no encryption is performed. For a barcode the data is packaged by first writing out a four-byte encryption header, followed by a randomly generated RC4 session key that has been encrypted according to the enclosed certificate, then finally the RC4 encryption of the original data under the previously mentioned random RC4 session key. The four-byte encryption header consists of a byte with the decimal value 130 (0x82 hex), a byte with the decimal value 1, then finally two bytes which are the two least significant bytes of the serial number of the enclosed certificate. These last two bytes serve as a hint to barcode decoders as to which public key certificate was used in the original encryption, and can thus aid in the selection of private keys for decrypting. For submission the encrypted data is added to a PDF as an encrypted attachment.
The id property
A unique identifier that may be used to identify this element as a target.
The event element is used within the following other elements: exclGroup field proto subform Any given object can only generate certain types of events. For example, a subform can generate initialize, enter, and exit events but it cannot generate events associated with key strokes and mouse gestures because it cannot accept input focus. It is the responsibility of the template creator to ensure that events are bound to appropriate objects.
Occurs when the user changes the field value. This will occur with each key-stroke, when text is pasted, when a new choice is selected, when a check button is clicked, and so on.
click
Occurs when the user clicks in the field. Most systems define click as pressing and releasing the mouse button while not moving the pointer beyond a very small threshold.
docClose
Occurs at the very end of processing if and only if all validations succeeded. Success in this case is defined as generating nothing worse than a warning (no errors). Note that this event comes too
late to modify the saved document; it is intended to be used for generating an exit status or completion message.
docReady
Occurs before the document is rendered but after data binding. It comes after the ready event associated with the Form DOM.
enter
For a field, occurs when the field gains keyboard focus. For a subform or exclusion group, occurs when some field within the subform or exclusion group gains keyboard focus, that is, keyboard focus moves from outside the object to inside it.
exit
For a field, occurs when the field loses keyboard focus. For a subform or exclusion group, occurs when all fields within the subform or exclusion group lose keyboard focus, that is, focus moves from inside the object to outside it.
full
Occurs when the user has entered the maximum allowed amount of content into the field.
indexChange
Occurs whenever the instance manager for a variable-occurrence object initially adds an instance or changes the instance number of an existing instance. The event is received only by the affected instances.
initialize
Occurs after data binding is complete. A separate event is generated for each instance of the field in the Form DOM.
mouseDown
Occurs when the user presses the mouse button in the field, but before the button is released.
mouseEnter
Occurs when the user drags the mouse pointer over the field without necessarily pressing the button.
mouseExit
Occurs when the user drags the mouse pointer out of the field without necessarily pressing the button.
mouseUp
Occurs when the user releases the mouse button in the field.
postExecute
Occurs when data is sent to a web service via WSDL, just after the reply to the request has been received and the received data is marshalled in a connectionData element underneath $datasets. A script triggered by this event has the chance to examine and process the received data. After execution of this event the received data is deleted.
postPrint
Occurs just after the rendered form has been sent to the printer, spooler, or output destination.
postSave
Occurs just after the form has been written out in PDF or XDP format. Does not occur when the Data DOM or some other subset of the form is exported to XDP.
preExecute
Occurs when a request is sent to a web service via WSDL, just after the data has been marshalled in a connectionData element underneath $datasets but before the request has been sent. A script triggered by this event has the chance to examine and alter the data before the request is sent. If the script is marked to be run only at the server, the data is sent to the server with an indication that it should run the associated script before performing the rest of the processing.
preOpen
This event applies only to drop-down choice lists, or more specifically choice lists for which open="userControl" or open="onEntry". It is intended to provided the form an opportunity to populate complex choice lists with additional of values from which the user can choose.
prePrint
Occurs just before the form data is written out in PDF or XDP format. Does not occur when the Data DOM or some other subset of the form is exported to XDP. XSLT postprocessing, if enabled, occurs after this event.
preSubmit
Occurs when data is submitted to the host via the HTTP protocol, just after the data has been marshalled in a connectionData element underneath $datasets but before the data is submitted to the host. A script triggered by this event has the chance to examine and alter the data before it is submitted. If the script is marked to be run only at the server, the data is sent to the server with an indication that it should run the associated script before performing the rest of the processing.
ready
The id property
A unique identifier that may be used to identify this element as a target.
The exData element is used within the following other elements: desc exObject extras items proto value variables
Content
This element may enclose foreign data which is PCDATA that represents the actual data content of the specified content type, encoded in the specified transfer encoding. When no data content is provided, the data content may be interpreted as representing a null value. This behavior is dependent upon the context of where the data content is used. For instance, a field may interpret empty data content as null based upon the associated nullType property in the data description.
Unadorned text. The XFA application may accept content that does not conform strictly to the requirements of the MIME type.
pcdata
Support for other text types, such as text/html is implementation-defined. When the referenced document is an image, a suitable MIME-type must be supplied for this property to tell the application that the content is an image. However, the application is free to override the supplied value if upon examining the image data it determines that the image data is of a different type. Which image types are supported is implementation-defined.
The id property
A unique identifier that may be used to identify this element as a target.
The referenced document is not encoded. If the referenced document is specified via a URI then it will be transferred as a byte stream. If the referenced document is inline it must conform to the restrictions on PCDATA.
base64
The binary content is encoded in accordance with the base64 transfer encoding s specified in [RFC2045].
The exObject element is used within the following other elements: area exObject proto subform
The id property
A unique identifier that may be used to identify this element as a target.
The object used as a prototype does not need to be the child of proto. Any object of the appropriate class can be used as a prototype. If both use and usehref are non-empty usehref takes precedence.
The exclGroup element is used within the following other elements: area pageArea proto subform An exclGroup is used to cause a set of radio buttons or check boxes to be mutually exclusive. This means that when the user activates one member of the set the other members are automatically deactivated. For example, if the set consists of radio buttons, clicking one button causes the other buttons to be released.
Each member of the exclusion group has an "on" value and "off" value associated with it. When the member is activated it assumes the "on" value and when it is deactivated it assumes the "off" value. The "on" value for each member of a particular exclusion group must be unique. Selecting one of the members of the exclusion group in the user interface causes each member's value to be set to its "on" or "off" value as appropriate. Similarly assigning a value to a member of the exclusion group, if the value assigned is the "on" value, causes the other members to be deactivated. Alternatively a value may be assigned to the exclusion group itself. In this case each member is activated if and only if the value matches the "on" value for that member.
Allow the content to be loaded from the data document, but not updated interactively. The effect is to behave (for this container) as though rendering to paper regardless of whether or not the context is interactive. Calculations are performed at load time but the content is not subsequently recalculated even if values upon which it depended change. Neither can the content be modified by scripts or web service invocations. NOTE: This value is not implemented by Adobe products.
open
Allow update without restriction. The interactive user may modify the container's content, and tab or otherwise navigate into it. The container will produce events.
protected
The processing application must prevent the user from making any direct changes to the container's content. Indirect changes (e.g., via calculations) may occur. The container will not participate in the tabbing sequence, though an application may allow the selection of text for clipboard copying. A protected container will not generate any events.
readOnly
The processing application must not allow the user to make direct changes to the container's content. Indirect changes (e.g., via calculations) may occur. The container shall participate in the tabbing sequence and must allow the user to view its content, possibly scrolling through that content if required. The user must be able to select the container's content for clipboard copying. The container shall also generate a subset of events (those not associated with the user making direct changes to the content).
The h property
Height for layout purposes. A measurement value for h overrides any growth range allowed by the minH and maxH attributes. The absolute omission of this attribute or a value specified as an empty string indicates that the minH and maxH must be respected. This attribute has no default. Setting this attribute to "-1" is an error.
The id property
A unique identifier that may be used to identify this element as a target.
The content of the element is positioned according to the to the location information expressed on the content elements.
lr-tb
The content of the element is flowed in a direction proceeding from left to right and top to bottom.
rl-tb
The content of the element is flowed in a direction proceeding from right to left and top to bottom.
row
This is an inner element of a table, representing one or more rows. The objects contained in this element are cells of the table and their height and width attributes, if any, are ignored. The cells are laid out from right to left and each one is adjusted to the height of the row and the width of one or more contiguous columns.
table
This is the outer element of a table. Each of its child subforms or exclusion groups must have its layout property set to row. The rows of the table are laid out from top to bottom.
tb
The content of the element is flowed in a direction proceeding from top to bottom.
Make it visible.
invisible
The w property
Width for layout purposes. A measurement value for w overrides any growth range allowed by the minW and maxW attributes. The absolute omission of this attribute or a value specified as an empty string indicates that the minW and maxW must be respected. This attribute has no default. Setting this attribute to "-1" is an error.
The x property
X coordinate of the container's anchor point relative to the top-left corner of the parent container's nominal content region when placed with positioned layout. Defaults to 0.
The y property
Y coordinate of the container's anchor point relative to the top-left corner of the parent container's nominal content region when placed with positioned layout. Defaults to 0.
The execute element is used within the following other elements: event proto Events can cause transactions to occur with web services. This element associates its parent event with a particular connection to a web service as defined in the connectionSet packet of the XDP. The connection definition supplies the particulars of the transaction such as the URIs to be used and the operation to request. The fields and exclusion groups which exchange data with the web service are nominated by their connect properties. The event can be processed by the client, by the server, or both. When an event is processed by both, the client does its part of the processing first, then sends the resulting data to the server for completion.
The XFA processor updates the values of containers that are already bound to the output of the connection.
remerge
The XFA processor clears the Form DOM and then rebuilds it, using a merge (data binding) operation. When merging data with dynamic forms, the XFA processor may dynamically create subforms to accommodate data.
The id property
A unique identifier that may be used to identify this element as a target.
The extras element is used within the following other elements: area barcode border break button calculate caption checkButton choiceList color contentArea corner dateTimeEdit defaultUi draw edge event exObject exclGroup extras field fill font format imageEdit keep linear manifest margin numericEdit occur pageArea pageSet passwordEdit pattern proto radial signature solid stipple subform subformSet template textEdit traversal traverse ui validate
The id property
A unique identifier that may be used to identify this element as a target.
The field element is used within the following other elements: area exclGroup pageArea proto subform Note that although all field elements have minH, maxH, minW and maxH properties, not all fields are growable. Fields that are not growable ignore these properties. Field elements with the following content or user interface types cannot grow:
Allow the content to be loaded from the data document, but not updated interactively. The effect is to behave (for this container) as though rendering to paper regardless of whether or not the context is interactive. Calculations are performed at load time but the content is not subsequently recalculated even if values upon which it depended change. Neither can the content be modified by scripts or web service invocations. NOTE: This value is not implemented by Adobe products.
open
Allow update without restriction. The interactive user may modify the container's content, and tab or otherwise navigate into it. The container will produce events.
protected
The processing application must prevent the user from making any direct changes to the container's content. Indirect changes (e.g., via calculations) may occur. The container will not participate in the tabbing sequence, though an application may allow the selection of text for clipboard copying. A protected container will not generate any events.
readOnly
The processing application must not allow the user to make direct changes to the container's content. Indirect changes (e.g., via calculations) may occur. The container shall participate in the tabbing sequence and must allow the user to view its content, possibly scrolling through that content if required. The user must be able to select the container's content for clipboard copying. The container shall also generate a subset of events (those not associated with the user making direct changes to the content).
The h property
Height for layout purposes. A measurement value for h overrides any growth range allowed by the minH and maxH attributes. The absolute omission of this attribute or a value specified as an empty string indicates that the minH and maxH must be respected. This attribute has no default. Setting this attribute to "-1" is an error.
The id property
A unique identifier that may be used to identify this element as a target.
This designator also influences the default direction of text flow within this element. The text layout engine may override this within portions or all of such text as per the rules in the Unicode Annex 9 [UAX-9] reference. The value of this property must be one of the following:
ambient
A valid locale name that conforms to the syntax: language[_country]. Examples of valid locales are zh for Chinese and en_CA for English specific for Canada. For a complete list of valid locale values, refer to the IETF RFC 1766 [RFC1766] and ISO 639 [ISO-639-1] / ISO 3166 [ISO-3166-1] specifications. Note that this is the same set of locale names used by the xml:lang attribute defined in [XML1.0]. When this property is absent or empty the default behavior is to inherit the parent object's locale. If the outermost subform does not specify a locale it uses the ambient locale from the operating system. If the operating system does not supply a locale it falls back onto en_US.
This attribute has no default. If w is omitted, a value must be supplied for this attribute. Setting this attribute to "-1" is an error.
Make it visible.
invisible
The ui property
A user-interface element that encloses the actual user interface widget element.
The w property
Width for layout purposes. A measurement value for w overrides any growth range allowed by the minW and maxW attributes. The absolute omission of this attribute or a value specified as an empty string indicates that the minW and maxW must be respected. This attribute has no default. Setting this attribute to "-1" is an error.
The x property
X coordinate of the container's anchor point relative to the top-left corner of the parent container's nominal content region when placed with positioned layout. Defaults to 0.
The y property
Y coordinate of the container's anchor point relative to the top-left corner of the parent container's nominal content region when placed with positioned layout. Defaults to 0.
The fill element is used within the following other elements: arc border font proto rectangle In the absence of a fill element the object is drawn without any fill, except for text which is drawn with a solid black fill. The fill element has a child color element that specifies the background orstarting color. If a fill element is provided but it has no child color element the color defaults to white. The fill element also has a child fill type element (linear, pattern, radial, solid, stipple) that specifies the type of fill operation to perform. This uses the color established with the fill's color element, possibly along with its own color, to achieve the desired effect. If a fill element is provided but it has no child type element the type defaults to solid.
The id property
A unique identifier that may be used to identify this element as a target.
Make it visible.
invisible
The filter element is used within the following other elements: proto signData signature The mdp, reasons and timestamp children are only meaningful if the parent of this element is a signature element. If they are grandchild of signData they are ignored.
The id property
A unique identifier that may be used to identify this element as a target.
The float element is used within the following other elements: desc exObject extras items proto value variables Note that the decimal element and the float element differ only in the user interface. They are interchangeable in every other way.
Content
This element may enclose float-data which is an optional leading minus sign (Unicode character U+002D), followed by a sequence of decimal digits (Unicode characters U+0030 - U+0039) separated by a single period (Unicode character U+002E) as a decimal indicator. To maximize the potential for data interchange, the decimal point is defined as '.' (Unicode character U+002E). No thousands/grouping separator, or other formatting characters, are permitted in the data. However, the template may employ a picture clause to generate a more suitable human-readable presentation of the value. When no content is present, the content shall be interpreted as representing a null value, irrespective of the value of the associtated nullType property in the data description.
The id property
A unique identifier that may be used to identify this element as a target.
The XML ID or SOM expression is resolved in the context of the external document. If both use and usehref are non-empty usehref takes precedence.
The font element is used within the following other elements: caption draw field proto
The id property
A unique identifier that may be used to identify this element as a target.
The font shall be rendered with a single line through the text.
2
The font shall be rendered with a double line through the text.
The rendered line shall be interrupted at word breaks. NOTE: This property has no effect in Acrobat. The line always extends across line breaks.
italic
bold
The format element is used within the following other elements: field proto
The id property
A unique identifier that may be used to identify this element as a target.
The handler element is used within the following other elements: filter proto A signature handler is software that creates or authenticates a signature. The signature creation and authentication may be purely mathematical, such as a public/private-key encrypted document digest, or it may be a biometric form of identification, such as a handwritten signature, fingerprint, or retinal scan. The signature handler may be a plug-in or server provided by an agency that specializes in signature authentication.
Content
The name of the preferred signature handler to use when validating this signature. Example signature handlers are Adobe.PPKLite, Entrust.PPKEF, CICI.SignIt, and VeriSign.PPKVS.
The id property
A unique identifier that may be used to identify this element as a target.
The handler is optional. That is, the XFA processing application may chose to use another algorithm rather than the one specified.
required
The handler is required. If it is not available, XFA processing application does not produce the requested signature. It is suggested the application also provide an error response to inform the person filling out the form that the signature has not been produced.
The image element is used within the following other elements: desc exObject extras items proto value variables
Content
This element may enclose image-data which is PCDATA representing the actual image data content of the image, encoded in base64 encoding (see [RFC2045] for more information). If the image element also specifies external image content via the href property, the external content shall take priority. When no data content is provided, the data content may be interpreted as representing a null value. This behavior is dependent upon the context of where the data content is used. For instance, a field may interpret empty data content as null based upon the associated nullType property in the data description.
The processing application must scale the image proportionally to the maximum possible size such that it fits within the nominal content region of the container.
none
The image shall be scaled such that it occupies the entire nominal content region of the container. This may result in different scale values being applied to the image's X and Y coordinates.
actual
The image shall be rendered using the dimensions stored in the image content. The extent of the container's nominal content region plays no role in the sizing of the image.
width
The image shall be scaled proportionally such that its width maps to the width of the container's nominal content region. The rendered image may not occupy the entire height of the nominal content region, or it may overflow the height.
height
The image shall be scaled proportionally such that its height maps to the height of the container's nominal content region. The rendered image may not occupy the entire width of the nominal content region, or it may overflow the width.
The id property
A unique identifier that may be used to identify this element as a target.
The referenced document is not encoded. If the referenced document is specified via a URI then it will be transferred as a byte stream. If the referenced document is inline it must conform to the restrictions on PCDATA.
base64
The binary content is encoded in accordance with the base64 transfer encoding s specified in [RFC2045].
The imageEdit element is used within the following other elements: proto ui
The image is represented as a URI reference. If the user provides the widget with a URI, the href attribute of the container's image object is updated to reflect the new URI; and if the image object was previously loaded with an embedded image, that image is removed from the object.
embed
The image is embedded in the container's image object. If the user provides the widget with a URI, the image referenced by the URI is embedded as the content of the image object.
The id property
A unique identifier that may be used to identify this element as a target.
The object used as a prototype does not need to be the child of proto. Any object of the appropriate class can be used as a prototype. If both use and usehref are non-empty usehref takes precedence.
The integer element is used within the following other elements: desc exObject extras items proto value variables
Content
This element may enclose integer-data which is an optional leading minus sign (Unicode character U+002D), followed by a sequence of decimal digits (Unicode characters U+0030 - U+0039). When no content is present, the content shall be interpreted as representing a null value, irrespective of the value of the associtated nullType property in the data description.
The id property
A unique identifier that may be used to identify this element as a target.
The issuers element is used within the following other elements: certificates proto If the certificate being used to sign the manifest can be authenticated by any of the issuers (either directly or indirectly), that certificate is considered acceptable for signing. The issuer certificates specified by this element may be used in conjunction with the object identifiers specified in the oids element. X.509v3 certificates are described in RFC 3280, Internet X.509 Public Key Infrastructure, Certificate and Certificate Revocation List (CRL) Profile [RFC3280].
The id property
A unique identifier that may be used to identify this element as a target.
The values provided in the element are optional seed values from which the XFA processing application may choose. The XFA processing application may also supply its own value.
required
The values provided in the element are seed values from which the XFA processing application must choose.
The items element is used within the following other elements: field proto This element has two different meanings depending upon whether is interpreted by a choice list user interface or a check box / radio button user interface. The choice list user interface, its containing field element and the set of items elements all participate together to provide a set of choices and control the value that gets stored in the field. The choice list presents the user with a set of choices. The object displayed for each choice (for example a text string) is generated from one content element which is a child of an items element. If there is only one items element that is a child of the field then the displayed object is copied into the field when the end-user selects that object. However there can be two items element within a choice list field. If there are two items elements one contains the set of objects to be displayed and the other contains the corresponding set of values to be saved into the field. The items element containing the set of values to be saved must be flagged as such. The checkButton user interface, its containing field element and the set of items elements all participate together to provide a single radio button or check box and control the value that gets stored in the field. (Mutually exclusive sets of check boxes or radio buttons are created by grouping these fields inside an exclGroup element.) Usually a check box is presented as a rectangle that contains a check mark when it is selected and is empty when deselected. However a check box can have three states, often represented by a check mark, a cross, and emptiness. A radio button can only have two states, which are often presented as a circle that is filled (or "illuminated") when the button is selected and empty when deselected.
A field with a checkBox user interface can have at most one items child. The items list can have at most three values. The first value in the list is the "on" value, that is the value taken when the button or box is selected. If there is a second value, it is the "off" value, that is the value taken when the button or box is deselected. If there is a third value, it is the "neutral" value, that is the value taken when the check box is empty. If a third value is provided for a radio button it is ignored. When the second or third value is not provided it defaults to the null string.
The id property
A unique identifier that may be used to identify this element as a target.
Make it visible.
invisible
hidden
The values supplied by this element may be entered into the field. At least one column must have save set to 1. If more than one column have this property set, the value in the first column with it set is saved.
The keep element is used within the following other elements: proto subform
The id property
A unique identifier that may be used to identify this element as a target.
The determination of whether a subform will be rendered intact within a content area or page will be delegated to the processing application. It is possible that the subform will be split across a content area or page. This is the default when the parent container's layout is "tb", "lr-tb", or "table".
contentArea
The subform is requested to be rendered intact within a content area. This is the default when the parent container's layout is "position" or "row".
pageArea
The subform is requested to be rendered intact within a page. NOTE: Adobe products do not support this value.
The determination of whether a subform will be rendered in the same content area or page together with the next subform will be delegated to the processing application. No special keep constraints will be forced.
contentArea
The subform is requested to be rendered in the same content area with the next subform.
pageArea
The subform is requested to be rendered in the same page with the next subform.
The determination of whether a subform will be rendered in the same content area or page together with the previous subform will be delegated to the processing application. No special keep constraints will be forced.
contentArea
The subform is requested to be rendered in the same content area with the previous subform.
pageArea
The subform is requested to be rendered in the same page with the previous subform.
The keyUsage element is used within the following other elements: certificates proto
The value must not be set in the certificate for it to be acceptable. There is no default for this attribute. If it is omitted or empty the corresponding attribute of the certificate is disregarded.
The value must not be set in the certificate for it to be acceptable. There is no default for this attribute. If it is omitted or empty the corresponding attribute of the certificate is disregarded.
The value must not be set in the certificate for it to be acceptable. There is no default for this attribute. If it is omitted or empty the corresponding attribute of the certificate is disregarded.
The value must not be set in the certificate for it to be acceptable. There is no default for this attribute. If it is omitted or empty the corresponding attribute of the certificate is disregarded.
The value must not be set in the certificate for it to be acceptable. There is no default for this attribute. If it is omitted or empty the corresponding attribute of the certificate is disregarded.
The id property
A unique identifier that may be used to identify this element as a target.
no
The value must not be set in the certificate for it to be acceptable. There is no default for this attribute. If it is omitted or empty the corresponding attribute of the certificate is disregarded.
The value must not be set in the certificate for it to be acceptable. There is no default for this attribute. If it is omitted or empty the corresponding attribute of the certificate is disregarded.
The value must not be set in the certificate for it to be acceptable. There is no default for this attribute. If it is omitted or empty the corresponding attribute of the certificate is disregarded.
The value must not be set in the certificate for it to be acceptable. There is no default for this attribute. If it is omitted or empty the corresponding attribute of the certificate is disregarded.
optional
The values provided in the element are optional seed values from which the XFA processing application may choose. The XFA processing application may also supply its own value. The application typically allows a person filling out the form to choose from the values provided or to specify his own value.
required
The values provided in the element are seed values from which the XFA processing application must choose. The application typically allows a person filling out the form to choose from only those values provided in the element.
The line element is used within the following other elements: proto value
Position the displayed line immediately to the left of the underlying vector or arc, when following that line from its start point to its end point.
right
Position the displayed line immediately to the right of the underlying vector or arc, when following that line from its start point to its end point.
The id property
A unique identifier that may be used to identify this element as a target.
The linear element is used within the following other elements: fill proto A linear gradient fill appears as the start color at one "side" of the object and the end color at the opposite side. Between those two sides, the color gradually changes from start color to end color. The color element enclosed by the linear element determines the end color. The color element enclosed by the parent fill element determines the start color.
The id property
A unique identifier that may be used to identify this element as a target.
The start color appears at the left side of the object and transitions into the end color at the right side.
toLeft
The start color appears at the right side of the object and transitions into the end color at the left side.
toTop
The start color appears at the bottom side of the object and transitions into the end color at the top side.
toBottom
The start color appears at the top side of the object and transitions into the end color at the bottom side.
The manifest element is used within the following other elements: proto signData signature variables Node collections are commonly used for signatures, however they may also be employed in scripts. The references may include non-unique SOM expressions, such as foo[*]. All nodes referenced by the expression are included in the list. The references may overlap or duplicate node references. Multiply-referenced nodes are included in multiple places in the list. When this element is the child of a signature element (hence being used to generate a PDF signature) only nodes which are fields are processed. Other nodes in the node list are ignored. PDF signatures automatically include all template and other nodes necessary to establish a document of record for the indicated fields.
The node set consists of those nodes and only those nodes listed.
exclude
The node set consists of all candidate nodes except those nodes listed. This value may only be used when this element is the child of a signature element.
all
The node set consists of all candidate nodes. No ref children are needed or expected. This value may only be used when this element is the child of a signature element.
The id property
A unique identifier that may be used to identify this element as a target.
The margin element is used within the following other elements: border caption checkButton choiceList dateTimeEdit draw exclGroup field imageEdit numericEdit passwordEdit proto signature subform textEdit
The id property
A unique identifier that may be used to identify this element as a target.
The mdp element is used within the following other elements: filter proto This element is only meaningful when it is the grandchild of a signature element. Otherwise it is ignored.
The id property
A unique identifier that may be used to identify this element as a target.
No changes to the document are permitted; any change to the document invalidates the signature.
2
Permitted changes are filling in forms, instantiating page templates, and signing; other changes invalidate the signature.
3
Permitted changes are those allowed by 2, as well as annotation creation, deletion, and modification; other changes invalidate the signature.
author
A person or program that makes up a new form. Documents with this kind of signature are often referred to as certified.
The medium element is used within the following other elements: pageArea proto
The id property
A unique identifier that may be used to identify this element as a target.
The rendering area is limited to a rectangle of the given width and height, at a distance of x from the left edge and y from the top edge. Note that the comma separators are required.
The orientation of the medium places the short edge at the top.
landscape
The orientation of the medium places the long edge at the top.
The message element is used within the following other elements: calculate proto validate If the message element is a child of validate, it may contain multiple text elements, each of which corresponds with a different type of validation. The name attribute of the text element associates the message with the type of validation. Specifically, the child text element named scriptTest is used for script validation, the one named nullTest is used for null validation, and the one formatTest is used for format validation. It is erroneous to have more than one child element with the same name or with no name. If the message element contains a single un-named text element, the message it contains is used for all messages issued by the enclosing validate element. If the message element is a child of calculate, it contains a single text element, which is displayed as specified in the calculate element's override attribute.
The id property
A unique identifier that may be used to identify this element as a target.
The numericEdit element is used within the following other elements: proto ui
If the field is single-line it scrolls horizontally. Multi-line fields do not scroll horizontally.
on
A horizontal scroll bar is always displayed whether or not the input overflows the boundaries of the field. The field is scrollable regardless of whether it is a single-line or multi-line field.
off
The user is not allowed to enter characters beyond what can physically fit in the field width. This applies to typing and pasting from the clipboard. However data which is merged into the field from the Data DOM is not restricted. If the data exceeds the field size the user may not be able to view all of it. Note that Acrobat does not implement the value on. If this value is encountered it is treated as auto.
The id property
A unique identifier that may be used to identify this element as a target.
The occur element is used within the following other elements: pageArea pageSet proto subform subformSet
The id property
A unique identifier that may be used to identify this element as a target.
The object used as a prototype does not need to be the child of proto. Any object of the appropriate class can be used as a prototype. If both use and usehref are non-empty usehref takes precedence.
The oid element is used within the following other elements: oids proto
Content
The Object Identifier string.
The id property
A unique identifier that may be used to identify this element as a target.
The oids element is used within the following other elements: certificates proto Values that uniquely identify the issuer certificate. This element is only applicable if it has a sibling issuers element which is non-empty. The certificate policies extension is described in RFC 3280, Internet X.509 Public Key Infrastructure, Certificate and Certificate Revocation List (CRL) Profile [RFC3280].
The id property
A unique identifier that may be used to identify this element as a target.
The values provided in the element are optional seed values from which the XFA processing application may choose. The XFA processing application may also supply its own value.
required
The values provided in the element are seed values from which the XFA processing application must choose.
The overflow element is used within the following other elements: proto subform subformSet
The id property
A unique identifier that may be used to identify this element as a target.
The pageArea element is used within the following other elements: pageSet proto
The page may only be inserted in response to a break-to-even-page while on an even page, or a break-to-odd-page while on an odd page.
nonBlank
The page may only be inserted to hold content or to meet minimum occurrence rules. This property is ignored within an orderedOccurrence pageSet.
The id property
A unique identifier that may be used to identify this element as a target.
The page area represents a numbered page. Therefore the instantiation of the page area contributes to the incrementing of the current page number.
0
The page area represents a un-numbered page. Therefore the instantiation of the page area does not contribute to the incrementing of the current page number.
This page can only be placed in an even position (when printing in duplex, on the back of a sheet).
odd
This page can only be placed in an odd position (when printing in duplex, on the front of a sheet). This property is ignored within an orderedOccurrence pageSet.
This page can only be used as the first page in a contiguous sequence.
last
This page can only be used as the last page in a contiguous sequence.
only
This page can be used in any context except first or last in a sequence. This property is ignored within an orderedOccurrence pageSet.
The viewnames simplex, duplex, and preprinted are particularly interesting here. By convention these are used for single-sided printing, double-sided printing, and printing onto preprinted stock, respectively.
The pageSet element is used within the following other elements: pageSet proto subform
The id property
A unique identifier that may be used to identify this element as a target.
orderedOccurrence
The pageArea objects are consumed in document order based on their occurrence indicators, ignoring their oddOrEven, blankOrNotBlank and pagePosition properties. This was the only method available prior to XFA 2.5.
simplexPaginated
pageArea objects are chosen according to need, ignoring oddOrEven and blankOrNotBlank properties but taking into account pagePosition.
duplexPaginated
pageArea objects are chosen according to need, taking into account oddOrEven, blankOrNotBlank and pagePosition properties.
The para element is used within the following other elements: caption draw exclGroup field proto subform
Align the radix indicator (decimal point or comma, depending upon locale) at the location specified by the radixOffset property of the para element. If there is no radix indicator, the last character is assumed to represent the units column.
right
The id property
A unique identifier that may be used to identify this element as a target.
An integer value greater than zero specifies the minimum quantity of content that must transition across the overflow boundary. For instance, specifying an integer value of 2 would prevent a single line of content from being widowed across the overflow boundary; it would result in a minimum of two lines of content transitioning across the overflow boundary.
all
Each paragraph of content must be kept intact and therefore cannot be broken across an overflow boundary.
Tab-stop that aligns content around a radix point NOTE: The alignment of each tab stop is independent of the text flow direction. To mirror a left-to-right form in a right-to-left environment it is necessary to change all left tab stops to right tab stops and vice-versa. For more information see Tab Stops.
The passwordEdit element is used within the following other elements: proto ui
If the field is single-line it scrolls horizontally. Multi-line fields do not scroll horizontally.
on
A horizontal scroll bar is always displayed whether or not the input overflows the boundaries of the field. The field is scrollable regardless of whether it is a single-line or multi-line field.
off
The user is not allowed to enter characters beyond what can physically fit in the field width. This applies to typing and pasting from the clipboard. However data which is merged into the field from the Data DOM is not restricted. If the data exceeds the field size the user may not be able to view all of it. Note that Acrobat does not implement the value on. If this value is encountered it is treated as auto.
The id property
A unique identifier that may be used to identify this element as a target.
The pattern element is used within the following other elements: fill proto The pattern is rendered as a series of parallel strokes, drawn at an application-defined interval across the fill area. Some pattern variations draw a second set of strokes at right angles to the first set. The strokes are drawn in the foreground color on top of a background that is pre-filled with the background color. The color element enclosed by the linear element determines the foreground color. The color element enclosed by the parent fill element determines the background color.
The id property
A unique identifier that may be used to identify this element as a target.
diagonalLeft
The pattern appears as a series of diagonal lines proceeding from the top-left to the bottom-right.
diagonalRight
The pattern appears as a series of diagonal lines proceeding from the bottom-left to the top-right.
crossDiagonal
The picture element is used within the following other elements: bind connect format proto ui validate
Content
This element encloses picture-data which is a special text format described in Picture Clause Specification.
The id property
A unique identifier that may be used to identify this element as a target.
<format/> [0..n] <handler/> [0..n] <image/> [0..n] <imageEdit/> [0..n] <integer/> [0..n] <issuers/> [0..n] <items/> [0..n] <keep/> [0..n] <keyUsage/> [0..n] <line/> [0..n] <linear/> [0..n] <manifest/> [0..n] <margin/> [0..n] <mdp/> [0..n] <medium/> [0..n] <message/> [0..n] <numericEdit/> [0..n] <occur/> [0..n] <oid/> [0..n] <oids/> [0..n] <overflow/> [0..n] <pageArea/> [0..n] <pageSet/> [0..n] <para/> [0..n] <passwordEdit/> [0..n] <pattern/> [0..n] <picture/> [0..n] <radial/> [0..n] <reason/> [0..n] <reasons/> [0..n] <rectangle/> [0..n] <ref/> [0..n] <script/> [0..n] <setProperty/> [0..n] <signData/> [0..n] <signature/> [0..n] <signing/> [0..n] <solid/> [0..n] <speak/> [0..n] <stipple/> [0..n] <subform/> [0..n] <subformSet/> [0..n] <subjectDN/> [0..n] <subjectDNs/> [0..n] <submit/> [0..n] <text/> [0..n] <textEdit/> [0..n] <time/> [0..n] <timeStamp/> [0..n] <toolTip/> [0..n] <traversal/> [0..n] <traverse/> [0..n] <ui/> [0..n] <validate/> [0..n] <value/> [0..n]
<variables/> </proto>
[0..n]
The proto element is used within the following other elements: subform
The ui property
A user-interface element that encloses the actual user interface widget element.
The radial element is used within the following other elements: fill proto A radial gradient fill appears as the start color at the center of the fill area, and the end color at the outer edges. Between those two extremes, the color gradually changes from start color to end color. Alternately, the roles of the start and end colors may be reversed. The color element enclosed by the radial element determines the end color. The color element enclosed by the parent fill element determines the start color.
The id property
A unique identifier that may be used to identify this element as a target.
The start color appears at the center of the object and transitions into the end color at the outer edge.
toCenter
The start color appears at the outer edge of the object and transitions into the end color at the center.
The reason element is used within the following other elements: proto reasons
Content
An acceptable reason.
The id property
A unique identifier that may be used to identify this element as a target.
The reasons element is used within the following other elements: filter proto
The id property
A unique identifier that may be used to identify this element as a target.
A reason is required.
The rectangle element is used within the following other elements: proto value The edges of a rectangle are rendered in a clockwise fashion, starting from the top left corner. This has implications for the rectangle's handedness. In particular, a left-handed stroke will appear immediately outside the rectangle's edge, while a right-handed edge will appear immediately inside. Such behavior is consistent with borders, but not arcs.
Position the displayed line immediately to the left of the underlying vector or arc, when following that line from its start point to its end point.
right
Position the displayed line immediately to the right of the underlying vector or arc, when following that line from its start point to its end point.
The id property
A unique identifier that may be used to identify this element as a target.
The ref element is used within the following other elements: manifest proto The reference must be to a node that is written out to XML when the form is saved. The reference is stored in the XML digital signature manifest as an XPath expression pointing to the corresponding element in the XML document. The computed signature includes that element and all of its children. If the value of this element includes the destination of the signature, the signature handler automatically excludes the signature from the signature value it calculates. Examples of SOM expressions used as the value of this element are foo[*] and mySubform..myField
Content
The XFA-SOM expression.
The id property
A unique identifier that may be used to identify this element as a target.
The script element is used within the following other elements: breakAfter breakBefore calculate event proto traverse validate variables
Content
This element contains a script in the scripting language specified by the contentType property.
Any value other than XFA signifies that the script may be ignored by standard XFA applications.
The id property
A unique identifier that may be used to identify this element as a target.
The script runs on both client and server. There are important security considerations when using scripts that may run on the server. See "Discarding Unexpected Submitted Packets" for a full discussion of security issues.
The setProperty element is used within the following other elements: draw exclGroup field proto subform
The signData element is used within the following other elements: event proto submit
The id property
A unique identifier that may be used to identify this element as a target.
Verify that the portion of the document included in the signature manifest matches the signature.
clear
The signature element is used within the following other elements: proto ui Note that this element is not used for an XML digital signature. This is used for PDF signatures only. The presence of a manifest child further indicates that this is an MDP+ signature.
The id property
A unique identifier that may be used to identify this element as a target.
The manifest and filter properties are only valid if the signature type is PDF1.6.
The signing element is used within the following other elements: certificates proto The handler uses the certificates in this element to populate the default list certificates from which the signor can choose.
The id property
A unique identifier that may be used to identify this element as a target.
The values provided in the element are optional seed values from which the XFA processing application may choose. The XFA processing application may also supply its own value. The application typically allows a person filling out the form to choose from the values provided or to specify his own value.
required
The values provided in the element are seed values from which the XFA processing application must choose. The application typically allows a person filling out the form to choose from only those values provided in the element.
The solid element is used within the following other elements: fill proto The color element enclosed by the parent fill element determines the solid fill color.
The id property
A unique identifier that may be used to identify this element as a target.
The speak element is used within the following other elements: assist proto
Content
This property may supply text to be enunciated as an audible prompt. This property may be empty or not supplied. When an interactive application prepares to issue an audible prompt, it searches for text in a search path that includes the speak element, the associated toolTip element, the associated caption element, and the container's name. The order of the search path is determined by the priority property.
There will not be an audible prompt. The default value of this property is 1.
The id property
A unique identifier that may be used to identify this element as a target.
caption
The stipple element is used within the following other elements: fill proto A stipple fill appears as the stippling of a stipple color on top of a solid background color The color element enclosed by the stipple element determines the stipple color. The color element enclosed by the parent fill element determines the background color.
The id property
A unique identifier that may be used to identify this element as a target.
<draw/> [0..n] <event/> [0..n] <exObject/> [0..n] <exclGroup/> [0..n] <field/> [0..n] <proto/> [0..n] <setProperty/> [0..n] <subform/> [0..n] <subformSet/> [0..n] </subform>
The subform element is used within the following other elements: area pageArea proto subform subformSet template
The processing application is permitted to utilize a printer macro for this subform.
0
The processing application is forbidden from utilizing a printer macro for this subform.
bottomRight
Connections are defined outside the template in a separate packet with its own schema. See the XFA Connection Set Specification for more information.
The h property
Height for layout purposes. A measurement value for h overrides any growth range allowed by the minH and maxH attributes. The absolute omission of this attribute or a value specified as an empty string indicates that the minH and maxH must be respected. This attribute has no default. Setting this attribute to "-1" is an error.
The id property
A unique identifier that may be used to identify this element as a target.
The content of the element is positioned according to the to the location information expressed on the content elements.
lr-tb
The content of the element is flowed in a direction proceeding from left to right and top to bottom.
rl-tb
The content of the element is flowed in a direction proceeding from right to left and top to bottom.
row
This is an inner element of a table, representing one or more rows. The objects contained in this element are cells of the table and their height and width attributes, if any, are ignored. The cells are laid out from right to left and each one is adjusted to the height of the row and the width of one or more contiguous columns.
table
This is the outer element of a table. Each of its child subforms or exclusion groups must have its layout property set to row. The rows of the table are laid out from top to bottom.
tb
The content of the element is flowed in a direction proceeding from top to bottom.
A valid locale name that conforms to the syntax: language[_country]. Examples of valid locales are zh for Chinese and en_CA for English specific for Canada. For a complete list of valid locale values, refer to the IETF RFC 1766 [RFC1766] and ISO 639 [ISO-639-1] / ISO 3166 [ISO-3166-1] specifications. Note that this is the same set of locale names used by the xml:lang attribute defined in [XML1.0]. When this property is absent or empty the default behavior is to inherit the parent object's locale. If the outermost subform does not specify a locale it uses the ambient locale from the operating system. If the operating system does not supply a locale it falls back onto en_US.
Make it visible.
invisible
Script may restore specific properties but nothing happens automatically. This setting is required for certified documents.
auto
The whole state of the document is saved at closing and restored automatically upon re-opening. This includes data which was manually entered to override calculations, and data which was retained despite generating a validation warning. As far as possible it is as though the original session was never interrupted. This setting can not be used for certified documents. This property is only meaningful on the root subform.
name
If the subform has a name it takes part in data binding and SOM expressions. Otherwise it does not.
none
The subform does not take part in data binding and SOM expressions, even if it has a name.
The w property
Width for layout purposes. A measurement value for w overrides any growth range allowed by the minW and maxW attributes. The absolute omission of this attribute or a value specified as an empty string indicates that the minW and maxW must be respected. This attribute has no default. Setting this attribute to "-1" is an error.
The x property
X coordinate of the container's anchor point relative to the top-left corner of the parent container's nominal content region when placed with positioned layout. Defaults to 0.
The y property
Y coordinate of the container's anchor point relative to the top-left corner of the parent container's nominal content region when placed with positioned layout. Defaults to 0.
The subformSet element is used within the following other elements: area proto subform subformSet
The id property
A unique identifier that may be used to identify this element as a target.
The members are to be instantiated in the order in which they are declared in the template. This has the effect of potentially re-ordering the content to satisfy the document order of the template.
unordered
The members are to be instantiated in data order regardless of the order in which they are declared. This has the effect of potentially re-ordering the set to satisfy the ordering of the content.
choice
The members are exclusive of each other, and only one member may be instantiated.The determination of which member to instantiate is based upon the data.
The subjectDN element is used within the following other elements: proto subjectDNs
Content
Sets of key-value pairs separated by the delimiter character. Each key-value pair consists of optional whitespace, followed by a key string, followed by an equals sign (=), followed by the value (which may include whitespace). All but the last key-value pair must be delimited by the specified delimiter character. The order of key-value pairs is not significant.
The id property
A unique identifier that may be used to identify this element as a target.
The subjectDNs element is used within the following other elements: certificates proto The certificate must contain all the attributes specified in the dictionary. It may also contain additional attributes.
The id property
A unique identifier that may be used to identify this element as a target.
The values provided in the element are optional seed values from which the XFA processing application may choose. The XFA processing application may also supply its own value.
required
The values provided in the element are seed values from which the XFA processing application must choose.
The submit element is used within the following other elements: event proto When an event containing a submit element is triggered, several factors influence whether the submission occurs, as described in "Submitting Data and Other Form Content to a Server".
Submitting event is part of a form included in or containing a PDF file. Format used to organize the data is XDP, as determined by the format property. XDP content being submitted includes PDF and/or XFDF, as determined by the xdpContent property.
The associated PDF document is not embedded in the XDP PDF packet; rather, a URI is optionally provided. The URI must resolve to a PDF resource of MIME type pdf. The URI is the value of the href attribute in the XDP PDF packet. The URI may be obtained from the XFDF F-key path, which is relative to the system on which the original PDF file was created. If the URI is unavailable, neither the PDF itself nor a URI is included in the PDF packet in the submitted XDP.
1
A copy of the associated PDF document is embedded in the submitted XDP. If the XFA application is capable of updating the PDF (for example, by adding annotations), the updated PDF is included in the PDF packet in the submitted XDP.
The data is translated and packaged into an URL-encoded format which emulates certain legacy software. The use of this format is deprecated; use urlencoded for new applications.
pdf
The data is packaged in PDF format as described in the PDF Reference [PDF].
urlencoded
The data is packaged in URL-encoded format as described in Uniform Resource Locators (URL) [RFC1738]. However contrary to the recommendation of that specification, the textEncoding property is used to determine how the text is expressed before it is URL-encoded.
xfd
The data is packaged in XML format as described in the XML Specification version 1.0 [XML1.0]. The schema is determined according to the same rules used for data unloading, as described in Unload Processing.
The id property
A unique identifier that may be used to identify this element as a target.
No special encoding is specified. The characters are encoded using the ambient encoding for the operating system.
ISO-8859-1
The characters are encoded using ISO-8859-1 [ISO-8859-1], also known as Latin-1.
ISO-8859-2
The characters are encoded using JIS X 0208, more commonly known as Shift-JIS [Shift-JIS].
KSC-5601
The characters are encoded using the Code for Information Interchange (Hangul and Hanja) [KSC5601].
Big-Five
The characters are encoded using Traditional Chinese (Big-Five). Note: there is no official standard for Big-Five and several variants are in use. XFA uses the variant implemented by Microsoft as code page 950 [Code-Page-950].
GB-2312
The characters are encoded using Unicode code points as defined by [Unicode-3.2], and UTF-8 serialization as defined by ISO/IEC 10646 [ISO-10646].
UTF-16
The characters are encoded using Unicode code points as defined by [Unicode-3.2], and UTF-16 serialization as defined by ISO/IEC 10646 [ISO-10646].
UCS-2
The characters are encoded using Unicode code points as defined by [Unicode-3.2], and UCS-2 serialization as defined by ISO/IEC 10646 [ISO-10646].
fontSpecific
The characters are encoded in a font-specific way. Each character is represented by one 8-bit byte.
Elements with the tags datasets, pdf, and xfdf are submitted to the host.
tag1tag2 ... tagN
Elements with tags matching any of the specified tags are submitted to the host.
*
This element may contain an originalXFAVersion processing instruction. See Processing instruction for backward compatability for more information.
The text element is used within the following other elements: desc exObject extras items message proto value variables
Content
This element may contain text data which is simple XML PCDATA or it may contain rich text. It may also be empty. If the content is rich text it must be contained in an aggregating element such as body. The aggregating element, as well as its content, must belong to the XHTML namespace. Only a subset of XHTML markup is supported. The mechanism and its limitations are fully described in Rich Text Reference. When no data content is provided, the data content may be interpreted as representing a null value. This behavior is dependent upon the context of where the data content is used. For instance, a field may interpret empty data content as null based upon the associated nullType property in the data description.
The id property
A unique identifier that may be used to identify this element as a target.
The textEdit element is used within the following other elements: proto ui
Text styling is not allowed. This is the default when the textEdit element does not contain an exData element.
1
Text styling is allowed. This is the default when the textEdit element does contain an exData element.
If the field is single-line it scrolls horizontally. Multi-line fields do not scroll horizontally.
on
A horizontal scroll bar is always displayed whether or not the input overflows the boundaries of the field. The field is scrollable regardless of whether it is a single-line or multi-line field.
off
The user is not allowed to enter characters beyond what can physically fit in the field width. This applies to typing and pasting from the clipboard. However data which is merged into the field from the Data DOM is not restricted. If the data exceeds the field size the user may not be able to view all of it. Note that Acrobat does not implement the value on. If this value is encountered it is treated as auto.
The id property
A unique identifier that may be used to identify this element as a target.
The text may span multiple lines. This is the default when the textEdit element is contained within a draw element.
0
The text is limited to a single line. This is the default when the textEdit element is contained within a field element. This property is provided for the benefit of clients (such as HTML browsers) that have two types of text edit widgets.
If the field is multi-line it scrolls vertically, displaying a vertical scroll bar when necessary. Single-line fields do not scroll vertically.
on
A vertical scroll bar is always displayed whether or not the input overflows the boundaries of the field. The field is scrollable regardless of whether it is a single-line or multi-line field.
off
The user is not allowed to enter characters beyond what can physically fit in the field height. This applies to typing and pasting from the clipboard. However data which is merged into the field from the Data DOM is not restricted. If the data exceeds the field size the user may not be able to view all of it.
The time element is used within the following other elements: desc exObject extras items proto value variables XFA time values conform to a subset of [ISO-8601]. This element is intended to hold only the time portion of an ISO-8601 date/time value, and any date information will be truncated. For instance, a time element enclosing the value 20010326T0630, meaning 6:30am on March 26th 2001, will truncate the date and hold the value of 0630, resulting in a value of 6:30am.
Content
This element may enclose time data which is a subset of [ISO-8601] as specified in Canonical Format Reference. When no content is present, the content shall be interpreted as representing a null value, irrespective of the value of the associtated nullType property in the data description.
The id property
A unique identifier that may be used to identify this element as a target.
The timeStamp element is used within the following other elements: filter proto This element is only meaningful when it is the child of a signature element. Otherwise it is ignored.
The id property
A unique identifier that may be used to identify this element as a target.
The toolTip element is used within the following other elements: assist proto
Content
This property supplies text that is intended to be displayed by an interactive application when the cursor hovers over the associated field.
The id property
A unique identifier that may be used to identify this element as a target.
The traversal element is used within the following other elements: draw exclGroup field proto subform
The id property
A unique identifier that may be used to identify this element as a target.
The traverse element is used within the following other elements: proto traversal The chain of links is not constrained to contain only one-to-one links. There may be many-to-one links, that is, traverse elements in multiple containers may point to the same destination. For this reason traversal chains may not be reversible, unless specifically designed to be so. When any traversal is not specified, it defaults to geographical order, where the forward direction is defined as left-to-right top-to-bottom. This definition of forward direction is used regardless of the language component of the locale.
The id property
A unique identifier that may be used to identify this element as a target.
User presses the Tab key. User enters the final character in a fixed-width field. Speech tool finishes enunciating text for the container. Defaults to left-to-right top-to-bottom order. In order to serve the speech tool, the chain of next links may include boilerplate objects. Such objects cannot accept input focus. Therefore, when advancing focus to the next input widget, the XFA application continues traversing the chain until it reaches an object that does accept
input focus. It is up to the template creator to ensure that the template does not present the XFA application with a non-terminating loop.
back
Destination when the user presses Shift-Tab on a PC, or the corresponding key on other platforms. Defaults to right-to-left bottom-to-top order.
down
Destination when the user presses the down-arrow key. Defaults to top-to-bottom order.
first
This property is applicable only when the container is a subform or subform set. The link points to the child container that gains focus when the container is entered. In effect, the container delegates focus via this link. If the container does not specify a "first" child container, the top left child container becomes by default the first to be traversed.
left
Destination when the user presses the left-arrow key. Defaults to right-to-left order.
right
Destination when the user presses the right-arrow key. Defaults to left-to-right order.
up
Destination when the user presses the up-arrow key. Defaults to bottom-to-top order.
The ui element
A user-interface element that encloses the actual user interface widget element.
<ui Properties: id="cdata" use="cdata" usehref="cdata" > <extras/> [0..1] <picture/> [0..1] One-of properties: <barcode/> [0..1] <button/> [0..1] <checkButton/> [0..1] <choiceList/> [0..1] <dateTimeEdit/> [0..1] <defaultUi/> [0..1] <imageEdit/> [0..1] <numericEdit/> [0..1] <passwordEdit/> [0..1] <signature/> [0..1] <textEdit/> [0..1] </ui>
The ui element is used within the following other elements: draw field proto This element has a set of one-of properties. The choice of one-of property determines the type of widget displayed. For example, if the button property is included the content will be displayed as a button widget. This determines both the appearance of the content and the interaction with it. Including the defaultUi property delegates the decision about what widget to use to the XFA application. Note that the presence of this element does not imply that its container accepts input from the user. The container could be a draw element, or it could be a field element with its access property set to nonInteractive. In either of these cases the ui element merely controls the manner in which the content is presented.
The id property
A unique identifier that may be used to identify this element as a target.
The validate element is used within the following other elements: exclGroup field proto subform
Emit a message if the data cannot be coerced to fit the picture clause, but allow the user to proceed to the next field (default).
disabled
Emit a message and refuse to accept data that cannot be coerced to fit the picture clause.
The id property
A unique identifier that may be used to identify this element as a target.
disabled
Emit a message if the field is empty, but allow the user to proceed to the next field.
Emit a message and refuse to accept data that the script reports is erroneous (default).
disabled
Emit a message if the script reports the data is erroneous, but allow the user to proceed to the next field.
The value element is used within the following other elements: caption draw field proto
The id property
A unique identifier that may be used to identify this element as a target.
The value does not represent a value supplied as an override to a calculation or validation constraint on the value.
1
The value does represent a value supplied as an override to a calculation or validation constraint on the value.
The variables element is used within the following other elements: proto subform Document variables are used to hold boilerplate which may be inserted conditionally under control of a script, for example terms and conditions of a purchase agreement. Placing the boilerplate content into a variables element makes it accessible to scripts via the usual mechanism of SOM expressions. The variables element can hold any number of separate data items. The data items can be any kind of data. Each data item bears its own name attribute so they are individually addressable by scripts. In SOM expressions, data items are directly under the subform. For example, if a subform is declared as:
<subform name="w"> <subform name="x"> <variables> <integer name="foo">1234</integer> <float name="bar">1.234</float> </variables> <field name="y">...</field> </subform> </subform>
then in the context of the subform named w, the variables are addressed by the SOM expressions x.foo and x.bar, while the field is addressed as x.y. It is conventional to place a single variables element in the root subform to hold all document variables, but this is only a convention. Any subform can hold a variable element.
The id property
A unique identifier that may be used to identify this element as a target.
18
Config Specification
The Configuration Data Object Model (DOM) provides a centralized mechanism for specifying configuration options for XFA applications. The configuration information may be specified in XML format and passively loaded at the start of processing. However the Configuration DOM also supports a scripting interface which allows user-supplied scripts to examine and modify the configuration settings. An XML document containing XFA configuration options is referred to in this specification as an XFA configuration document. A file containing such a document is often referred to as an XCI file. XCI stands for XFA Configuration Information. Often the filename suffix .xci is used for XCI files, but this is merely a convention.
Background
In order to use the configuration options it is necessary to understand where and when each option has its effect. Typically XFA applications pass through a number of stages. For example, an interactive form-filling application passes through the following stages: 1. Load the configuration options into the Configuration DOM. 2. Load the template into the Template DOM. 3. Obtain existing user data from the host in the form of an XML document. 4. Preprocess existing user data via an XSLT interpreter. 5. Load the preprocessed data into the XML Data DOM. 6. Load the data from the XML Data DOM into the XFA Data DOM. 7. Merge the existing data with the template. 8. Layout the merged template plus data onto pages. 9. Present the laid-out pages to the user. 10. Accept and validate input from the user, updating the XFA Data DOM. 11. Unload the updated user data from the XFA Data DOM to the XML Data DOM. 12. Create a new XML document containing the updated user data. 13. Postprocess the new XML document via an XSLT interpreter. 14. Send the postprocessed XML document to the host. Notionally, a separate processor handles each phase, however all of the processors rely on the Configuration DOM to supply them with configuration information. This centralized mechanism makes it possible to keep all of the configuration information in a single XML document for easy maintenance, and to supply a uniform scripting interface for all configuration options.
752
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The actual location of the configuration document (or documents) is variable. XFA provides a convenient mechanism for packaging XML data (XDP Specification on page 884), which might be used to bundle configuration options with the template and other relevant material. However, XFA applications are free to use other mechanisms, such as environment variables and command-line parameters, instead of or in addition to XDP. This specification is limited to the setting of configuration options via XML documents and scripts.
Defaults
Conceptually the Configuration DOM exists before any configuration document is loaded. The Configuration DOM must initialize all option values to their default values at startup. Options that require a keyword value must be initialized to the values shown in the corresponding elements of the above skeleton. Options that do not require keyword values must be initialized to the empty string. When the XFA application loads the configuration DOM from a configuration document, if a particular element is not present in the configuration document, the associated option must retain its preexisting value. Most of the default values cause the associated option to adopt safe behavior. The only exceptions are the uri elements which supply the locations for the data and template documents; the XFA application may declare a fatal error if either or both of these options is set to the empty string when the time comes to load the associated document. As an alternative it may fall back on some other mechanism to locate the required document.
Scripting Interface
The Configuration DOM is part of a larger tree that holds all exposed XFA objects. The single large tree makes it possible to refer to XFA objects using a unified format known as a Scripting Object Model (SOM) expression. The grammar of SOM expressions is described in Scripting Object Model on page 74. Briefly, an expression consists of a sequence of node names separated by periods (. characters). Starting from some point in the XFA tree, each successive name identifies which child of the current node to descend to. The root of the Configuration DOM must be a child of the root xfa node. Hence, the config node itself is xfa.config. Assuming the application Name is myapp, the node representing the attributes element would be referenced by the SOM expression xfa.config.myapp.data.attributes. In addition, SOM expressions must recognize the short-form $config as equivalent to xfa.config. Thus for example the attributes element mentioned in the preceding paragraph could be referenced as $config.myapp.data.attributes. The scripting interface must make it possible for user-supplied scripts to inspect and modify the contents of the Configuration DOM. It is not responsible for guaranteeing that modifying the value of a particular option will have any effect. In particular, many options have an effect only during a particular phase of
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processing. If a script changes the value of an option after the option has already had its effect the change will, at best, accomplish nothing. The script writer must ensure that each assignment is done before the phase(s) to which the option applies. It is recommended that XFA applications and scripts set any required non-default option values in the Configuration DOM as early in the processing cycle as possible. Some options have effects during more than one phase of processing. This specification does not guarantee that it is safe to alter a value in the Configuration DOM during or after the processing phase in which the value is first used. When and under what circumstances it is safe to alter the value of an option is implementation-defined. It is recommended that XFA applications and scripts refrain from altering the value of each option in the Configuration DOM once it has been set.
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The adjustData element is used within the following other elements: data Re-normalizing is coercing the data in the XML Data DOM to fit the structure of the template. The coercion is carried out near the end of the data binding phase.
Content
The content must be one of the following:
0
Coercion of the data is required. When the value of adjustData is 1, the XFA application rearranges the XML Data DOM to fit the hierarchical structure of the template. When the value is 0, the XFA application does not alter the XML Data DOM except to introduce nodes that the template explicitly references. This option takes effect during data binding. See Re-Normalization.
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The attributes element is used within the following other elements: data This option takes effect during the data-load phase. If this option prevents attributes from being loaded into the XFA Data DOM, then during the data-unload phase the XFA application obtains the attributes and their values from the XML Data DOM and inserts them into the output XML document. See the Basic Data Binding to Produce the XFA Form DOM for more detailed information about the algorithms used. For more information about this element, see Extended Mapping Rules.
Content
The content must be one of the following:
preserve
The XFA application loads attributes from the XML Data DOM into the XFA Data DOM as described in Basic Data Binding to Produce the XFA Form DOM.
delegate
The XFA application does not load attributes into the XFA Data DOM.
XFA Specification Chapter 18, Config Specification Config Element Reference 757
The base element is used within the following other elements: template
Content
The value of this element, when supplied, is interpreted as a URI Reference as defined in RFC 2396 [RFC2396], after processing according to Section 3.1. In ordinary language this means that it must be a fully qualified path pointing to the location of include files. This option supplies a facility very similar to the xml:base attribute specified in XML Base [XMLBASE]. However it provides an additional level of flexibility because it can be set by a separate document (or even a script) external to the template. This option affects processing during all phases. Note that XFA processors should not allow untrusted forms to change this option.
XFA Specification Chapter 18, Config Specification Config Element Reference 758
XFA Specification Chapter 18, Config Specification Config Element Reference 759
XFA Specification Chapter 18, Config Specification Config Element Reference 760
The data element is used within the following other elements: common
XFA Specification Chapter 18, Config Specification Config Element Reference 761
XFA Specification Chapter 18, Config Specification Config Element Reference 762
The debug element is used within the following other elements: xsl If the uri element contained within the debug element is empty or absent the XFA application must not save the preprocessed document. Hence the temp file containing the preprocessed document, if any, must be deleted. However if the uri element contained with the debug element is non-empty the XFA application must, upon exiting, leave behind an XML document at the specified URI containing the output of the preprocess phase. This option takes effect during the data-load phase if it is contained in data, in the template-load phase if it is contained in template, and in the rendering phase if it is contained in xdc. For more information about this element, see XSLT Transformations.
XFA Specification Chapter 18, Config Specification Config Element Reference 763
The excludeNS element is used within the following other elements: data Elements and attributes with the specified namespace are not loaded from the XML Data DOM into the XFA Data DOM. The schema allows any number of excludeNS elements so any number of namespaces can be excluded. In addition namespaces associated with XML and XFA are always excluded. Namespace exclusion is described in detail in the section Extended Mapping Rules. When an excludeNS element is present but empty it must have no effect. This option takes effect during the data-load phase. For more information about this element, see Extended Mapping Rules.
Content
The full URI (not the prefix) of a namespace to be excluded.
XFA Specification Chapter 18, Config Specification Config Element Reference 764
The groupParent element is used within the following other elements: transform Sometimes XML data documents do not express the full structure of the data in markup. This option provides a way to restore structure to XML data documents in which the hierarchy has been flattened. It causes a contiguous group of related elements to be placed under a parent group node in the XFA Data DOM. This option applies only to elements that are named in the ref attribute of the enclosing transform element. There are a number of subtleties involved in the use of this option. See Extended Mapping Rules for more information.
Content
The name of the parent group node to insert.
XFA Specification Chapter 18, Config Specification Config Element Reference 765
The ifEmpty element is used within the following other elements: transform This option applies only to empty elements with tags that match the value of the ref attribute of its enclosing transform element. This option takes effect during the data-load phase. When the content is ignore it also causes data from the XML Data DOM to be blended with data from the XFA Data DOM during the data-unload phase. For more information about this element see Extended Mapping Rules.
Content
The content must be one of the following:
dataValue
The empty element is represented in the XFA Data DOM by a dataValue node.
dataGroup
The empty element is represented in the XFA Data DOM by a dataGroup node.
ignore
The empty element is omitted from the XFA Data DOM and removed from the XML Data DOM. When the updated data is written out during the data-unload phase, the empty element will be omitted from the new XML document. DataValue and dataGroup nodes are discussed in Extended Mapping Rules.
XFA Specification Chapter 18, Config Specification Config Element Reference 766
XFA Specification Chapter 18, Config Specification Config Element Reference 767
The incrementalLoad element is used within the following other elements: data When loading incrementally the window size is set by the peer window element.
Content
The content must be one of the following:
none
Load a sliding window of records that starts at the beginning and only moves forward.
XFA Specification Chapter 18, Config Specification Config Element Reference 768
The locale element is used within the following other elements: common Locale determines the currency symbol, the radix symbol, calendar, day and month names, and other information which is culture- or location-specific. This option supplies an ambient locale, overriding the ambient locale supplied by the host operating system (if any). Each individual subforms may assert its own locale, inherit an asserted locale from its parent, or use the ambient locale.
Content
The content must be locale code as defined in About Locale Names. When this element is omitted or empty the locale supplied by the host operating system is used as the ambient locale. If the host operating system does not supply a locale or the supplied locale is not recognized then en_US (or equivalently en-US) is used. XFA applications are not expected to support all possible locale values, especially as new country codes are issued from time to time. If the supplied code is anything other than en_US and it is not contained in the locale set packet, then it is implementation-defined whether the locale is supported or not. All XFA applications are required to support en_US.
XFA Specification Chapter 18, Config Specification Config Element Reference 769
The localeSet element is used within the following other elements: common
Content
The content, if non-null, is a URI. The URI points to an XDP document which contains a localeSet packet. When this element is omitted or empty there is no alternate source of locale definitions. Only the ones in the form and built-in defaults are available. Note: not all XFA processors should or do honor this option. In some environments it would present a security vulnerability.
XFA Specification Chapter 18, Config Specification Config Element Reference 770
The log element is used within the following other elements: common
The to property
This option controls the location where either Presentation Agent will place either the log data or its output data.
XFA Specification Chapter 18, Config Specification Config Element Reference 771
The message element is used within the following other elements: messaging Each message that may be generated by the application has a default severity. The elements contained by this element override the default severity for a particular message, or suppress the message entirely. For a list of severity classes see the descripion of the threshold element.
XFA Specification Chapter 18, Config Specification Config Element Reference 772
The messaging element is used within the following other elements: common
XFA Specification Chapter 18, Config Specification Config Element Reference 773
The mode element is used within the following other elements: log This option is ignored unless the content of to is uri.
Content
The content must be one of the following:
append
If the log file already exists, the log data is appended to the end of the existing file. If the log file does not exist a new file is created.
overwrite
If the log file exists it is truncated to zero length before the new log data is written to it. If the log file does not exist a new file is created.
XFA Specification Chapter 18, Config Specification Config Element Reference 774
The msgId element is used within the following other elements: message Message identifiers are implementation-defined, however they are always positive integers. Message identifiers can be identified from error messages in the log or obtained from the application publisher.
Content
The content must be a positive integer. The value must be unique, that is, there must not be multiple msgId elements referring to the same message.
XFA Specification Chapter 18, Config Specification Config Element Reference 775
The nameAttr element is used within the following other elements: transform This option applies only to nodes corresponding to elements with tags that match the value of the ref attribute of its enclosing transform element. This option takes effect during the data-load phase. For more information about this element see the narrative description of this element at Extended Mapping Rules.
Content
The value of nameAttr is the name of an attribute. If the element in the XML document has an attribute with this name and the attribute's value is not the empty string (""), the XFA application renames the corresponding node in the XFA Data DOM as the value of the attribute. For example, if the configuration document contains the fragment
<transform ref="foo"> <nameAttr>bar</nameAttr> </transform>
then the XFA application renames the corresponding node in the XFA Data DOM from "foo" to "blort".
XFA Specification Chapter 18, Config Specification Config Element Reference 776
The outputXSL element is used within the following other elements: data The outputXSL element can contain a uri element. If the uri element is present and non-empty the output XML document is passed through an XSLT interpreter, otherwise the output XML document is left alone. The URI which is the content of the uri element supplies the location of the XSLT stylesheet. XSLT is defined by XML Transformations (XSLT) Version 1.0 [XSLT]. For more information about this element see XSLT Transformations.
XFA Specification Chapter 18, Config Specification Config Element Reference 777
The picture element is used within the following other elements: transform This option applies only to nodes corresponding to elements with tags that match the value of the ref attribute of its enclosing transform element. When the XFA Data DOM is updated, the new data for the node is validated against, and if it matches formatted in accordance with, the picture clause. This is in addition to any validation or calculation supplied by other means. This option takes effect during the data update phase. For more information about this element see Extended Mapping Rules.
Content
The content must be a picture clause. The format of the picture clause is defined in the chapter Picture Clause Specification.
XFA Specification Chapter 18, Config Specification Config Element Reference 778
The presence element is used within the following other elements: transform This option applies only to nodes corresponding to elements with tags that match the value of the ref attribute of its enclosing transform element. This option takes effect during the data-load phase. When the content is ignore it also causes data from the XML Data DOM to be blended with data from the XFA Data DOM during the data-unload phase. For more information about this element see Concealing Content Depending on View and Extended Mapping Rules.
Content
The content must be one of the following:
preserve
The node itself is excluded from the XFA Data DOM but its children are promoted to become children of the dissolved node's parent.
dissolveStructure
The node itself is included, but its children and their descendents are excluded from the XFA Data DOM.
ignore
The node is excluded from the XFA Data DOM along with all of its descendents (that is, nodes corresponding to content of the element to which the node corresponds). However during the data-unload phase (when writing out a new XML document) the affected content is copied out from the XML Data DOM into the new document.
remove
The node and is descendents are excluded from the XFA Data DOM and in addition the corresponding nodes are removed from the XML Data DOM. The result of this is that during the data-unloading phase a new XML document is produced which lacks the removed data.
XFA Specification Chapter 18, Config Specification Config Element Reference 779
XFA Specification Chapter 18, Config Specification Config Element Reference 780
The range element is used within the following other elements: data When range has non-null content the XFA application loads only those records indicated into the XFA Data DOM. During the data-unload phase the skipped records are restored to the output XML document by copying them from the XML Data DOM. When the content of range is the null string, or the range element is omitted, the range defaults to the entire document. Note that this is the reverse of the usual default behavior - the range element names the records which are to be processed, yet when no records are named the result is not to exclude all records but to include all records. This option affects processing during data load and data unload. For more information about this element see Extended Mapping Rules.
Content
When it is not the null string, the value of range is a comma-separated list of one or more record numbers and/or record number ranges. A record number is a non-negative decimal integer, where 0 (zero) indicates the first record. A record number range is a record number, followed by a - character, followed by another record number which is numerically equal to or greater than the other record number. Record number ranges and record numbers are allowed to overlap. For example, the following
<range>3-5,9,4,5-6</range>
XFA Specification Chapter 18, Config Specification Config Element Reference 781
The record element is used within the following other elements: data Records are processed sequentially, almost as separate documents. For example, in a form-printing application, the cycle of operations for each record is:
preprocess the record via an XSLT interpreter load the preprocessed record into the XML Data DOM load the record data from the XML Data DOM into the XFA Data DOM merge the record data with the template lay out the merged template and record data upon the page render the layed-out template and record data into printer language send the rendering to the printer
A consequence of this cyclical processing is that a new merge operation and a new layout operation are performed for each new record. Because of this, the resulting printed document starts each record at the top of a new page, even though nothing in the template specifies that this should happen. Data that is outside any record is still available via SOM expression in scripts and in data references (dataRef elements). See Basic Data Handling for more information about records. See XFA Template Specification for more information about dataRef elements. This option affects processing during every phase. For more information about this element see Extended Mapping Rules.
Content
The value of record determines the granularity at which the document is divided into records. The value can be empty or a non-negative decimal integer or a tag name. If the record element is absent or empty the entire document is treated as a single record. If the value of record is an integer, it specifies the level in the tree at which the XFA application treats each node as the root of a record. 0 represents the root of the whole XML Data DOM. For example, if the value is 2, each element which is two levels in from the outermost element is considered as enclosing a record. Content that is at a higher level is considered as outside any record. If the value of record is not an integer, it is interpreted as a tag name. The first element in the XML data document with a tag matching the value of record determines the level of a record within the tree. The XFA application treats nodes in the XFA Data DOM that correspond to the same level and have a name
XFA Specification Chapter 18, Config Specification Config Element Reference 782
matching the value of record as root nodes of records. All data that is not descended from such a node are treated as outside any record.
XFA Specification Chapter 18, Config Specification Config Element Reference 783
The relevant element is used within the following other elements: template Various elements within the template may have relevant attributes. When present on a template element this attribute means that the element is to be loaded only in some views and ignored in others. This option names the active view or views. For example if the value of this element is invoice then any portion of the template marked with a relevant attribute which includes the token invoice is loaded.
Content
The content may be a single token or a space-separated list of tokens. Each token names a view that is active simultaneously with the others in the list. Note that unlike the relevant attribute there is no support for a - prefix; views can only be included by this element, not excluded.
XFA Specification Chapter 18, Config Specification Config Element Reference 784
The rename element is used within the following other elements: transform This option applies only to nodes corresponding to elements with tags that match the value of the ref attribute of its enclosing transform element. If the rename element is absent or empty the name of the node in the XFA Data DOM is taken from the tag name. If the value is non-empty the node in the XFA Data DOM corresponding to the element is renamed to the value of the rename element. For example, an XFA configuration document includes the fragment
<transform ref="foo"> <rename>bar</rename> </transform>
and as a result for each node in the XFA Data DOM corresponding to an element named "foo", the XFA application renames the node to "bar". This does not affect the XML Data DOM. This option takes effect during the data-load phase. For more information, see Extended Mapping Rules.
Content
The contents must be a valid XFA node name. See XFA Names for a discussion of XFA node names.
XFA Specification Chapter 18, Config Specification Config Element Reference 785
The severity element is used within the following other elements: message The message may be suppressed entirely or set to a different severity class. For a list of severity classes see the description of the threshold element. Changing the severity of a message does not change the application's response to the situation that caused the message to be issued. For example, upgrading a warning message to the error class does not cause the application to exit when the message is issued. Similarly downgrading an error message does not cause the application to attempt to recover gracefully. However changing the severity class does potentially affect whether the message is logged (as controlled by the threshold element) and may affect how it is highlighted in the log.
Content
The content must be one of the following:
ignore
XFA Specification Chapter 18, Config Specification Config Element Reference 786
XFA Specification Chapter 18, Config Specification Config Element Reference 787
The startNode element is used within the following other elements: data When the startNode element is absent or empty the entire XML data document is processed. When it is non-empty it supplies an expression which identifies the root of the subtree that is processed, and the XFA application does not process any data outside the subtree. This option affects processing during every phase. For more information about this element, see Extended Mapping Rules.
Content
The form of the expression is "xfasom(somExpr)" where somExpr is a restricted XFA-SOM expression. The general syntax of SOM expressions is defined in the XFA Scripting Object Model 2.0 Specification Scripting Object Model. The expression in the startNode element is restricted to a fully-qualified path of element types (tag names) starting with the root of the XML-data-document and referring to a single element. The Extended Mapping Rulesgives an example of startNode usage.
XFA Specification Chapter 18, Config Specification Config Element Reference 788
The startPage element is used within the following other elements: template
Content
The content must be an integer.
XFA Specification Chapter 18, Config Specification Config Element Reference 789
The suppressBanner element is used within the following other elements: common This option is most commonly used inside scripts which run the application in background and log to standard output. Its purpose is to ensure that a clean log is produced. However if there is no standard output, or if the banner is not on standard output (for example a splash screen in a GUI) then this option may be ignored.
Content
The content must be one of the following:
0
XFA Specification Chapter 18, Config Specification Config Element Reference 790
The template element is used within the following other elements: common The template elementmust enclose a non-empty uri element. The XFA applicationmust obtain the template using the URI specified by the content of the uri element. This option takes effect during the template-load phase.
XFA Specification Chapter 18, Config Specification Config Element Reference 791
XFA Specification Chapter 18, Config Specification Config Element Reference 792
The threshold element is used within the following other elements: log Messages are logged if and only if they are as severe as the threshold or more severe. The severity categories, in order from least severe to most severe, are defined as:
trace
Messages displaying internal states. These are used mostly during debugging.
information
Advisory messages. An event has occurred which is worthy of note but there is not necessarily anything wrong.
warning
Warning messages. Something has gone wrong but the application can cope with it.
error
Error messages. A severe error has occurred from which the application can not gracefully recover.
Content
The content must be one of the following:
trace
Log all messages that are generated. Note that trace messages are only generated when enabled by an area option.
error
XFA Specification Chapter 18, Config Specification Config Element Reference 793
XFA Specification Chapter 18, Config Specification Config Element Reference 794
The to element
This option controls the location where either Presentation Agent will place either the log data or its output data.
<to Properties: desc="cdata" lock="0 | 1" > ...pcdata... </to>
The to element is used within the following other elements: log When contained within a log element this element controls where Presentation Agent places the log data. When contained within a output this element controls where Presentation Agent will place the generated output data.
Content
The content must be one of the following. In addition, when contained within an output element, the value stderr is prohibited.
null
The log or output data is written to system memory. This is used internally by LiveCycle to avoid unnecessary disk I/O.
stderr
The log data is written to standard error. This option is not available for output data, only for log data.
stdout
I'm guessing that this means the log or output data is written to the system log??
uri
The log or output data is directed to the [URI] specified by this element's sibling uri element. For more information about this element, see [PA].
XFA Specification Chapter 18, Config Specification Config Element Reference 795
XFA Specification Chapter 18, Config Specification Config Element Reference 796
The transform element is used within the following other elements: data Multiple transform elements can overlap in their effects. This happens when multiple transform elements have the same value for "ref". It also happens when one transform causes a node to be renamed, whereupon the new name matches the value of the ref attribute of another transform. The effect of such overlaps is sensitive to the order of the transform elements in the configuration document. The interaction of transform elements is described at length in Extended Mapping Rules. Note that, as specified in Extended Mapping Rules, it is not recommended to configure multiple transform elements with the same value for "ref". This option takes effect during the data-load phase. Some option settings also affect the data-unload phase.
XFA Specification Chapter 18, Config Specification Config Element Reference 797
XFA Specification Chapter 18, Config Specification Config Element Reference 798
The uri element is used within the following other elements: data debug log outputXSL template xsl This option takes effect during a phase that depends on its context. It merely supplies additional information to the element which encloses it, hence takes effect during the same phase as its enclosing element.
Content
The content of this element may be empty in some contexts. In contexts where it may be empty, emptiness indicates that the action governed by the enclosing element is not to be performed. For example, when the uri element inside outputXSL is empty, its emptiness signifies that no output XSLT processing is to be done. The uri element may be empty when it is inside a debug, outputXSL, or xsl element. The uri element must not be empty when its immediate container is a data element, a template element, or a xdc element. When the uri element is not empty, its content must be either a filename in animplementation-defined format or a URI in accordance with RFC 2396 [RFC2396]. The set of supported schemes ("http:", "ftp:", "file:", etc.) isimplementation-defined.
XFA Specification Chapter 18, Config Specification Config Element Reference 799
The versionControl element is used within the following other elements: common
Issue a warning and save with the target version. Functionality may be lost.
update
Issue a warning and save the form with the newer version.
error
XFA Specification Chapter 18, Config Specification Config Element Reference 800
If possible process the document using the logic for the version in the form. If this is not possible report an error and refuse to process the form.
XFA Specification Chapter 18, Config Specification Config Element Reference 801
The whitespace element is used within the following other elements: transform This option applies only to nodes corresponding to elements with tags that match the value of the ref attribute of its enclosing transform element. This option takes effect during the data-load phase. For more information about this element, see Extended Mapping Rules.
Content
The content must be one of the following:
preserve
Contiguous white space characters at the start (left) end of the character data are deleted.
normalize
Contiguous white space characters at both ends are trimmed as for trim, but in addition internal contiguous groups of white space characters are replaced by single space characters.
rtrim
Contiguous white space characters at the end (right) of the character data are deleted.
trim
Contiguous white space characters at both ends of the character data are deleted, equivalent to a combination of ltrim and rtrim. White space characters in this context include space (U0020), tab (U0009), carriage return (U000D), and line feed (U000A). This is the set of white space characters defined by [XML1.0].
XFA Specification Chapter 18, Config Specification Config Element Reference 802
XFA Specification Chapter 18, Config Specification Config Element Reference 803
The window element is used within the following other elements: data The window size is in records. There are two separate settings. The first setting is the number of records before the current record that are retained in memory. These are records earlier than the current record in document order and have already been processed. The second setting is the number of records after the current record that are pre-loaded into memory. These are records that are later than the current record in document order and have not yet been processed.
Content
The content must be either a single non-negative integer or a pair of non-negative integers separated by a comma. If only one number is supplied then it is used for both settings. If two numbers are supplied the first one controls the before window and the second one controls the after window. For example, a value of 1 causes the XFA processor to hold the previous record, the current record, and the next record in memory. By contrast a value of 0,1 causes the XFA processor to hold only the current record and the next record in memory.
XFA Specification Chapter 18, Config Specification Config Element Reference 804
The xsl element is used within the following other elements: data template When this element is contained by a data element it controls the preprocessing of data from the XML data document before loading into the XML Data DOM. When it is contained by a template element it controls the preprocessing of the template definition from the template document before loading into the Template DOM. When it is contained by an xdc element it controls the preprocessing of the device control information. If xsl is empty or if it contains a uri element which is empty preprocessing does not take place - instead the XFA application loads directly from the supplied document into the target DOM. However if xsl contains a non-empty uri element the XFA application gets an XSLT script from the URI which is the content of uri and invokes an XSLT interpreter to preprocess the supplied XML document. The XFA application then loads the preprocessed document into the target DOM. XSLT is defined by XML Transformations (XSLT) Version 1.0 [XSLT]. This option takes effect during the data-load phase if it is contained in data or in the template-load phase if it is contained in template. For more information about this element, see XSLT Transformations.
XFA Specification Chapter 18, Config Specification Config Element Reference 805
19
806
Content
The data-content is interpreted as the name of currency symbol, where the name is given by the element's name property (described next).
[3]
Content
The data-content is interpreted as one format of a date pattern, where the format is given by the element's name property (described below).
[4]
Content
The data-content is interpreted as a fixed-position array of localized date and time pattern symbols.
Content
The data-content is interpreted as the name of the week. Specifically, the first occurrence of this element specifies the name of the first day of the week (Sunday).The second occurrence of this element specifies the name of the second day of the week (Monday), etc...The seventh and last occurrence of this element specifies the name of the seventh day of the week (Saturday).
Content
The data-content is interpreted as the name of the era. Specifically, the first occurrence of this element specifies the name of the first era of the calendar (BC).The second and last occurrence of this element specifies the name of the second era of the calendar (AD).
Content
The data-content is interpreted as the name of the aspect of the meridiem. Specifically, the first occurrence of this element specifies the name of the ante-meridiem (AM).The second and last occurrence of this element specifies the name of the post-meridiem (PM).
Content
The data-content is interpreted as the name of the month. Specifically, the first occurrence of this element specifies the name of the first month of the year (January).The second occurrence of this element specifies the name of the second month of the year (February), etc...The twelfth and last occurrence of this element specifies the name of the twelfth month of the year (December).
Content
The data-content is interpreted as the format of a number pattern, where the format is given by the element's name property (described below).
[4]
Content
The data-content is interpreted as the kind of number symbol, where the kind is given by the element's name property (described below).
The zero symbol. The remaining 1-9 digits' values are assumed to follow this symbol's Unicode value.
[5]
Content
The data-content is interpreted as the format of a time pattern, where the format is given by the element's name property (described below).
[4]
20
Note: The trailing / is required. The 2.4 represents the most recent version of this specification in which the connection set schema was revised. XFA applications written to this specification are expected to accept namespaces with larger version numbers and silently ignore elements and attributes that are not part of this specification. On the other hand when a future XFA application written for a later version of this specification sees the 2.4 it will know that it may have to make fixups to bring the connection set up to date with the later specification. The following skeleton summarizes the structure of the connectionSet element and its descendants:
<connectionSet xmlns="http://www.xfa.org/schema/xfa-connection-set/2.4/"> <!-- zero or more of...--> <wsdlConnection dataDescription="ddName" name="cxnName"> <operation input="inputElementName" output="outputElementName" >wsdlOperationName</operation> <soapAction>actionURI</soapAction>
832
XFA Specification Chapter 20, Connection Set Specification About the Connection Set Grammar 833
<soapAddress>endpointURI</soapAddress> <wsdlAddress>wsdlURI</wsdlAddress> </wsdlConnection> <!-- at most one of eitherthis... --> <xmlConnection dataDescription="ddName" name="cxnName"> <uri>sampleDataURI</uri> </xmlConnection> <!-- ...or this... --> <xsdConnection dataDescription="ddName" name="cxnName"> <rootElement>elementName</rootElement> <uri>schemaURI</uri> </xsdConnection> </connectionSet>
XFA Specification Chapter 20, Connection Set Specification Connection Set Element Reference 834
This is the container for all information related to the connection set. There must be at most one connectionSet element in an XDP. This element may contain number of wsdlConnection elements and at most one of either xmlConnection or xsdConnection elements.
XFA Specification Chapter 20, Connection Set Specification Connection Set Element Reference 835
The operation element is used within the following other elements: wsdlConnection SOAP allows multiple operations to share the same name. When this happens the input and output attributes are used to disambiguate. Note that the SOAP operation must use the document style and literal encoding. See [SOAP1.1] for more information about doc-literal operations.
Content
The name of the selected operation.
The id property
An identifier which may be used to identify this element in URIs.
XFA Specification Chapter 20, Connection Set Specification Connection Set Element Reference 836
XFA Specification Chapter 20, Connection Set Specification Connection Set Element Reference 837
The rootElement element is used within the following other elements: xsdConnection
Content
The name of the outermost element that was used when generating the data description from the associated W3C [XMLSchema] schema.
The id property
An identifier which may be used to identify this element in URIs.
XFA Specification Chapter 20, Connection Set Specification Connection Set Element Reference 838
The soapAction element is used within the following other elements: wsdlConnection
Content
The URI for the SOAP action. When the request is sent to the server, this is the value of the soapAction attribute of the soap:operation element. The soap:operation element is specified in [WSDL1.1].
The id property
An identifier which may be used to identify this element in URIs.
XFA Specification Chapter 20, Connection Set Specification Connection Set Element Reference 839
The soapAddress element is used within the following other elements: wsdlConnection
Content
The address of the SOAP end point. A SOAP end point consists of a protocol and a data format bound to a network address. When the request is sent to the server, this is the value of the location attribute of the soap:address element. The value must be a URI in the format specified by [RFC2396]. The soap:address element is specified in [WSDL1.1].
The id property
An identifier which may be used to identify this element in URIs.
XFA Specification Chapter 20, Connection Set Specification Connection Set Element Reference 840
The uri element is used within the following other elements: xmlConnection xsdConnection For security reasons this URI should not be honoured if it points outside the enclosing XDP or PDF package, unless the entire package is trusted.
Content
The URI for the sample document or schema.
The id property
An identifier which may be used to identify this element in URIs.
XFA Specification Chapter 20, Connection Set Specification Connection Set Element Reference 841
The wsdlAddress element is used within the following other elements: wsdlConnection
Content
The URI for the service description.
The id property
An identifier which may be used to identify this element in URIs.
XFA Specification Chapter 20, Connection Set Specification Connection Set Element Reference 842
The wsdlConnection element is used within the following other elements: connectionSet This connection corresponds to a particular action requested from a particular service with data going in a particular direction or directions.
XFA Specification Chapter 20, Connection Set Specification Connection Set Element Reference 843
The xmlConnection element is used within the following other elements: connectionSet This connection encapsulates the information that a data description was derived from a particular sample document. This information is not needed by consumers of the form but may be useful for applications that modify the form template or the associated data description.
XFA Specification Chapter 20, Connection Set Specification Connection Set Element Reference 844
The xsdConnection element is used within the following other elements: connectionSet This connection encapsulates the information that a data description was derived from a particular W3C [XMLSchema] schema. This information is not needed by consumers of the form but may be useful for applications that modify the form template or the associated data description.
21
Multiple views. A data description in XFA is analogous to a view in a relational database. There may be multiple views for the same data because different web service operations require different subsets of the data, organized in different ways. The output document, if there is one, may require yet another organization. Hence, a single view expressed by a schema bound to the data with a schema declaration is not enough. Support for a range of data. XFA processing applications can accept existing data instance documents without alteration, despite the inconsistency of schema declarations in XML documents.
The XFA data description syntax is more concise and readable than XML Schema [XMLSchema] but does not do as much. XFA data descriptions do not include defaults and do not support validation of text content. They do, however, fully describe the namespaces, element names, attribute names, and the hierarchy which joins them. Data descriptions are described in the Data Description Grammar on page 845 and Data Description Element Reference on page 848 sections of this specification. In keeping with the general principle that XFA is tolerant when importing data, data descriptions are not used to validate data coming into the XFA application. Indeed, most of any given data description is only used during output from the XFA application. (The sole part used on input is the dd:nullType attribute, which affects both input and output.) This means that data descriptions are not required for most processing, so XFA continues to support ad hoc datasets. Of course, validation of data is still possible using scripts contained in validate elements in the template. See Template Specification on page 493 for more information about validation scripts. XFA applications produce XML output in several different contexts. The XML output document may be the final product of the XFA application. It may be sent to an HTTP host via the SUBMIT action. Or it may be sent to a web service. In the last case the XFA application will probably receive a reply, itself in XML format. Each of these contexts is known as a connection. Connections are described in the Connection Set Specification on page 832. Web Services are described in Using Web Services on page 393. Submission via HTTP is described in Submitting Data and Other Form Content to a Server on page 386.
XFA Specification Chapter 21, Data Description Specification Data Description Grammar 846
dataDescription elements is not significant. dataDescription elements and their content must use the following namespace: http://ns.adobe.com/data-description/
Note: The trailing / is required. It is conventional to represent this namespace with the prefix dd but this is only a convention. Any prefix may be used as long as it maps to the namespace given above. Within this specification dd: is used as shorthand for a namespace prefix mapped to the data description namespace. Similarly xsi: is used as shorthand for a namespace prefix mapped to the XML Schema Instance namespace (http://www.w3.org/2001/XMLSchema-instance) . The XML Schema Instance namespace is defined in [XMLSchema]. Each dataDescription element has a name attribute. The value of the name attribute must be unique. One dataDescription element may have a name equal to the name attribute of the template's root subform. This data description is the default. The data description itself (i.e. the content of the dataDescription element) is a picture of the data structure, without content but with optional namespace markup. For example, consider the following sample data.
The simplest data description for this document is generated simply by stripping out the text content from the sample data, as follows.
XFA Specification Chapter 21, Data Description Specification Data Description Grammar 847
The simple data description shown above requires that the data document have exactly the same structure as the description. Namespaced markup provides a way to specify alternate structure and repeated or optional elements. It corresponds to a subset of W3C XML Schema [XMLSchema]. Most of the markup is dd: attributes applied to non-dd: elements. In addition a dd:group element, which does not correspond to an element in the data document, is provided for more complicated cases. For example, the following data description relaxes the previous data description using added dd: markup (highlighted in bold).
This data description still matches the original sample data, but the markup makes it more flexible. For example, it also matches the following data which has no po:firstname element and has multiple po:item elements.
Example 21.4 Data which also matches the augmented data description
<po:order xmlns:po="http://www.example.com/order"> <po:orderid>A314</po:orderid> <po:customer> <po:lastname>Coyote</po:lastname> </po:customer> <po:item> <po:desc>super magnet</po:desc> <po:qty>1</po:qty> </po:item> <po:item> <po:desc>steel ball bearing</po:desc> <po:qty>1000</po:qty> </po:item> <po:item> <po:desc>mallet (large)</po:desc> <po:qty>1</po:qty> </po:item> </po:order>
XFA Specification Chapter 21, Data Description Specification Data Description Element Reference 848
dd:dataDescription Element
This element is the container for a data description. More than one dataDescription element may reside in a dataset element.
dd:name attribute
This attribute supplies a name for the data description. The attribute must be supplied and the name (XFA Names on page 63) must be unique across dataDescription elements. If the name is the same as the name of the template's root subform, this data description is the default data description.
dd:group Element
This element groups together its child elements, but without there being a corresponding element in the data document. For example, the location element in a data document contains either an x element followed by a y element, or an r element followed by a theta element. Hence the following is a valid fragment:
<location> <x>1.234</x> <y>5.678</y> </location>
Another use of dd:group is to provide a way to apply dd: attributes to groups of elements, again without any corresponding element appearing in the data document. For example, the polyline element always contains sets of coordinates. Each coordinate consists of an x element followed by a y element. There must be at least two coordinates, but there is no maximum number. This can be declared in a data description as follows:
XFA Specification Chapter 21, Data Description Specification Data Description Element Reference 849
Note that the white space in the data description differs from the white space in the above sample data. Nonetheless the sample data matches the data description. This is a consequence of the fact that white space in data groups is not significant, as explained in White Space Handling on page 132.
dd:maxOccur Attribute
This attribute sets the maximum number of times the element may occur in a contiguous sequence. The default is 1, that is, by default no more than one occurrence is allowed. The special value -1 means that there is no limit to the number of times the element may repeat. If the value is not -1 it must be a positive integer. The dd:maxOccur attribute corresponds in function to the XML Schema xsd:maxOccurs attribute. Note however that the attribute name differs (no final s on dd:maxOccur) and that xsd:maxOccurs uses the value unbounded rather than -1. Note that when an element has dd:model set to unordered, its direct children must not have dd:maxOccur set to anything larger than 1. This is the same restriction that applies in [XMLSchema] to the children of the analogous element xsd:all. For example, the following fragment declares that it is acceptable for the po:item element to repeat without limit. Hence a single purchase order can list any number of purchased items.
<po:item dd:maxOccur="-1"> <po:desc/> <po:qty/> </po:item>
The following fragment declares that the number of attendee elements inside the meeting element is limited to twelve (perhaps the capacity of the room):
<meeting> <attendee dd:maxOccur="12"> </meeting>
dd:minOccur Attribute
This attribute sets the minimum number of times the element must occur in a contiguous sequence. The default is 1, that is, by default at least one occurrence is required. The value0 means that the element is optional. If the value is not 0 it must be a positive integer.
XFA Specification Chapter 21, Data Description Specification Data Description Element Reference 850
The dd:minOccur attribute corresponds in function to the XML Schema xsd:minOccurs attribute. Note however that the attribute name differs (no final s on dd:minOccur). Note that when an element has dd:nullType set to exclude it must also have dd:minOccur set to0. The following fragment declares that firstname is not required in the purchase order. Without the dd:minOccur attribute the value of firstname could be the empty string but the element could not be omitted entirely. On the other hand lastname continues to be mandatory.
<po:customer> <po:lastname/> <po:firstname dd:minOccur="0"/> </po:customer>
The following fragment declares that a meeting must be attended by at least two people:
<meeting> <attendee dd:minOccur="2"/> </meeting>
dd:model Attribute
This attribute controls the way in which the children of the element are related. The value of dd:model must be one of the following:
choice
The data must have a child element or elements corresponding to just one of the children of this element. This corresponds to the xsd:choice element in [XMLSchema].
ordered
The data must have child elements corresponding to each of the children of this element (except for children with dd:minOccur equal to 0, which are optional). The children must occur in the same order that they are declared here. This corresponds to the xsd:sequence element in [XMLSchema]. This is the default.
unordered
The data must have child elements corresponding to each of the children of this element (except for children with dd:minOccur equal to 0, which are optional). The children may occur in any order. This corresponds to the xsd:all element in XML Schema. Note: When an element has dd:model set to unordered, its direct children must not have dd:maxOccur set to anything larger than1. This is the same restriction imposed by [XMLSchema] upon the children of the analogous element xsd:all. The following fragment illustrates a simple use of dd:model with a value of choice:
<payment dd:model="choice"> <cash/> <visa/> <amex/> </payment>
XFA Specification Chapter 21, Data Description Specification Data Description Element Reference 851
The following fragment has been cooked up to illustrate what happens when a child element governed by choice has a dd:maxOccur greater than one. In the example, a pizza order can be the house special or it can have la carte toppings. If the pizza is la carte, multiple toppings may be specified. On the other hand if the house special is chosen toppings must not be specified. The dd:model attribute with a value of choice makes houseSpecial and topping mutually exclusive:
<pizza dd:model="choice"> <houseSpecial/> <topping dd:maxOccur="-1"> <pizza/>
The following fragment illustrates a simple use of dd:model with a value of ordered. The fragment declares that the address in the data must have each of the child elements in the exact order given. Any child element may be empty but it must be present.
<address dd:model="ordered"> <streetNumber/> <streetName/> <city/> <postalCode/> </address>
Since ordered is the default, the same result would be obtained by omitting the dd:model attribute entirely. The following fragment illustrates a simple use of dd:model with a value of unordered. It is the same as the previous example except for the value of dd:model.
<address dd:model="unordered"> <streetNumber/> <streetName/> <city/> <postalCode/> </address>
XFA Specification Chapter 21, Data Description Specification Data Description Element Reference 852
The result is almost the same as the previous example using ordered, but more forgiving. Any data document that matches the previous example will also match this data description. In addition, this data description also matches data documents in which the order of the streetNumber, streetName, city, and postalCode elements is switched around. However they are all still required to be present. Hence the following fragment of data is valid:
<address> <city/> <streetName>Main Street</streetName> <postalCode/> <streetNumber>47</streetNumber> </address>
The following fragment illustrates the effect of combining unordered with one or more children having dd:minOccur set to a value of 0. Any element with dd:minOccur set to a value of 0 is optional. Consider the following fragment:
<address dd:model="unordered"> <streetNumber/> <streetName/> <city dd:minOccurs="0"/> <postalCode dd:minOccurs="0"/> </address>
Given the above data declaration fragment, the following data fragment is valid:
<address> <streetName>Main Street</streetName> <streetNumber>47</streetNumber> </address>
dd:nullType Attribute
This attribute controls the mapping between data elements and null nodes in a DOM. A null node is distinct from a node with content of the empty string. A null node has no value at all it is null in the database sense. The base XML 1.0 standard [XML1.0] does not provide a standard way to represent null nodes. Sometimes an empty element is represented internally as a null node, but other times it is represented as a normal node with a value of the empty string. XML Schema [XMLSchema] defines a syntax using the namespaced attribute xsi:nil. The dd:nullType attribute specifies which method is used for this element and, unless overridden, inherited by its descendants. The value of the attribute must be one of the following:
empty
On output null nodes are represented by empty elements. On input empty elements are mapped to null nodes, as are elements marked as null using xsi:nil="true". This is the default.
exclude
On output null nodes are excluded from the XML document. On input elements marked as null using xsi:nil="true"are mapped to null nodes. Elements that are empty but not marked using xsi:nil="true" are mapped to regular nodes with values of the empty string. Note: When the element has dd:nullType set to exclude it must also have a dd:minOccur attribute set to 0. Failure to uphold this rule would lead to a schema violation when the node was null because dd:nullType would require that the element be omitted and at the same time dd:minOccur would require that it be included.
XFA Specification Chapter 21, Data Description Specification Data Description Element Reference 853
xsi
On output null nodes are represented by empty elements with the attribute xsi:nil equal to true, as defined in XML Schema [XMLSchema]. On input any element (empty or not) with xsi:nil="true" is mapped to a null node, while empty elements that do not have xsi:nil="true" are mapped to regular nodes with values of the empty string. Note: This applies only to elements. Attributes with the value of empty string are governed by the dd:reqAttrs attribute.
dd:reqAttrs Attribute
This attribute lists the names of mandatory attributes for the element. The names in the list are separated by white space. The order of the names is not significant. Each name in the list must match the name (including namespace) of an attribute on the element. If an attribute name in the list has no namespace prefix it is imputed to inherit the namespace of the element, just as it does when used in the instance document. On input an attribute with the value of empty string is treated the same way as any other attribute. On output, when an attribute is mandatory but the attribute is not present in the DOM, the XFA application generates an attribute with the value of the empty string. By contrast when the attribute is not mandatory and it is not present in the DOM it is omitted from the XML document. For example, the following fragment declares that in the shirt element the attributes color and size are mandatory, but supplier is optional. All of the attributes inherit the namespace of their element.
<t:shirt color="" supplier="" size="" dd:reqattrs="size color"/>
The following example declares two mandatory attributes. The element is in the default namespace. One of its mandatory attributes is also in the default namespace, but the other is in a different namespace.
<animal name="" vet:species="" dd:reqattrs="name vet:species"/>
22
Defaults
Many of the elements and attributes in the source set DOM have default values defined. When the application loads the source set document, where an element or attribute has been omitted, the application inserts the default value. The defaults appear as nodes in the source set DOM, just as though they had been loaded from the source set document.
Scripting Interface
The Source Set DOM is part of a larger tree that holds all exposed XFA objects. The single large tree makes it possible to refer to XFA objects using a unified format known as a Scripting Object Model (SOM) expression. The grammar of SOM expressions is described in Scripting Object Model on page 74. Briefly, an expression consists of a sequence of node names separated by periods (. characters). Starting from some point in the XFA tree, each successive name identifies which child of the current node to descend to. The root of the Source Set DOM is a child of the root xfa node. Hence, the sourceSet node itself is
854
XFA Specification Chapter 22, Source Set Specification The Source Set Data Object Model 855
xfa.sourceSet. The timeout value for the connection used by the first source would be referenced by the SOM expression xfa.sourceSet.source.connection.timeout.
In addition SOM expressions recognize the short-form $sourceSet as equivalent to xfa.sourceSet. Thus for example the timeout value mentioned in the preceding paragraph could be referenced as $sourceSet.source.connection.timeout. The scripting interface makes it possible for user-supplied scripts to inspect and modify the contents of the Source Set DOM. Some of these objects make available methods that allow scripts to exert detailed control over the database transaction.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 856
The bind element is used within the following other elements: source
Unadorned text. The XFA application may accept content that does not conform strictly to the requirements of the MIME type.
pcdata
Support for other text types, such as text/html is implementation-defined. When the data is an image, a suitable MIME-type must be supplied for this property to tell the application that the content is an image. However, the application is free to override the supplied value if upon examining the image data it determines that the image data is of a different type. Which image types are supported is implementation-defined.
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 857
The referenced document is not encoded. If the referenced document is specified via a URI then it will be transferred as a byte stream. If the referenced document is inline it must conform to the restrictions on PCDATA.
base64
The binary content is encoded in accordance with the base64 transfer encoding s specified in [RFC2045].
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 858
The boolean element is used within the following other elements: extras
Content
The be empty or contain one of the following:
0
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 859
The command element is used within the following other elements: source When a database operation is invoked the set of sibling command elements is executed sequentially in document order. The operations can not nest, that is, each command must terminate before the next one starts.
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 860
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 861
The connect element is used within the following other elements: source
Does not automatically open the connection. The connection must be opened by script, using the db object, before it can be used.
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 862
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 863
The connectString element is used within the following other elements: connect
Content
The content of this element corresponds to the "connectString" parameter supplied to the "Create" method described in the ADOX API Reference [ADO].
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 864
The delete element is used within the following other elements: command The query element can be used to delete record(s) using a cursor and record set. By contrast this element does not use a cursor or record set. Instead it performs a one-time operation with no persistent context.
Content
The SQL command to send to the database. Operation suspends until the database reports that the operation is complete.
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 865
The extras element is used within the following other elements: connect extras recordSet
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 866
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 867
The insert element is used within the following other elements: command The query element can be used to insert record(s) using a cursor and record set. By contrast this element does not use a cursor or record set. Instead it performs a one-time operation with no persistent context.
Content
The SQL command to send to the database. Operation suspends until the database reports that the operation is complete.
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 868
The integer element is used within the following other elements: extras
Content
This element may enclose integer-data which is an optional leading minus sign (Unicode character U+002D), followed by a sequence of decimal digits (Unicode characters U+0030 - U+0039). Alternatively it may be empty.
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 869
The map element is used within the following other elements: query
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 870
The password element is used within the following other elements: connect
Content
The password to be sent at connect time. This element may be omitted or empty. In interactive contexts when authorization is required but the element is omitted or empty the XFA processor prompts for the password. In non-interactive contexts when authorization is required the password must be supplied here. Communicating any password in clear text is risky. If the password is supplied, steps should be taken to ensure that the form's distribution is limited.
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 871
The query element is used within the following other elements: command Despite the name, this element can also be used to delete, insert, and update records.
Indicates that the type of select string is not known. The XFA application or database is required to parse the string to find out.
text
Indicates that the select string is a SQL command or textual stored procedure call.
table
Indicates that the select string is the name of a table. All of the columns in the table are returned by the query.
storedProc
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 872
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 873
The recordSet element is used within the following other elements: query
Stay at the beginning. If an insert is performed the new record will be placed in front of the record that is currently the first in the set.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 874
"Default. Uses a forward-only cursor. Identical to a static cursor, except that you can only scroll forward through records. This improves performance when you need to make only one pass through a Recordset."
unspecified
"Does not specify the type of cursor." The database or XFA processor decides on the type of cursor. XFA does not provide a way to determine what type of cursor was chosen, so the form creator must make pessimistic assumptions.
keyset
"Uses a keyset cursor. Like a dynamic cursor, except that you can't see records that other users add, although records that other users delete are inaccessible from your Recordset. Data changes by other users are still visible."
dynamic
"Uses a dynamic cursor. Additions, changes, and deletions by other users are visible, and all types of movement through the Recordset are allowed, except for bookmarks, if the provider doesn't support them."
static
"Uses a static cursor. A static copy of a set of records that you can use to find data or generate reports. Additions, changes, or deletions by other users are not visible."
Notionally reposition to the last record in the set. When using a forwardOnly cursor the effect is to stay at the last record rather than advancing to EOF.
stayEOF
Stay at the end. If an attempt is made to fetch another record in the forward direction the request will return a null.
addNew
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 875
"Indicates read-only records. You cannot alter the data. A read-only lock is the 'fastest' type of lock because it does not require the server to maintain a lock on the records."
unspecified
"Does not specify a type of lock." The lock type is determined by the database and/or XFA application. XFA does not provide a way to find out what type of lock was chosen, so the form creator must make pessimistic assumptions.
pessimistic
"Indicates pessimistic locking, record by record. The provider does what is necessary to ensure successful editing of the records, usually by locking records at the data source immediately before editing. Of course, this means that the records are unavailable to other users once you begin to edit, until you release the lock by calling Update. Use this type of lock in a system where you cannot afford to have concurrent changes to data, such as in a reservation system."
optimistic
"Indicates that the provider uses optimistic locking - locking records only when you call the Update method. This means that there is a chance that the data may be changed by another user between the time you edit the record and when you call Update, which creates conflicts. Use this lock type in situations where the chances of a collision are low or where collisions can be readily resolved."
batchOptimistic
"Indicates optimistic batch updates. Required for batch update mode. Many applications fetch a number of rows at once and then need to make coordinated updates that include the entire set of rows to be inserted, updated, or deleted. With batch cursors, only one round trip to the server is needed, thus improving update performance and decreasing network traffic. Using a batch cursor library, you can create a static cursor and then disconnect from the data source. At this point you can make changes to the rows and subsequently reconnect and post the changes to the data source in a batch." XFA does not provide a way to control disconnecting and reconnecting. Whether or not this optimization is performed is implementation-defined.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 876
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 877
The select element is used within the following other elements: query
Content
Depending on the value of commandType in the parent query element, this string is a SQL select command, the name of a table, the name of a stored procedure, or a textual procedure call.
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 878
The source element is used within the following other elements: sourceSet
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 879
The XML ID or SOM expression is resolved in the context of the external document. If both use and usehref are non-empty usehref takes precedence.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 880
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 881
The text element is used within the following other elements: extras
Content
This element may contain text data which is simple XML PCDATA. It may also be empty.
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 882
The update element is used within the following other elements: command The query element can be used to update record(s) using a cursor and record set. By contrast this element does not use a cursor or record set. Instead it performs a one-time operation with no persistent context.
Content
The SQL command to send to the database. Operation suspends until the database reports that the operation is complete.
The id property
A unique identifier that may be used to identify this element as a target.
XFA Specification Chapter 22, Source Set Specification Source Set Element Reference 883
The user element is used within the following other elements: connect
Content
Username sent when connecting to the database. If authorization is not needed this element may be omitted or empty.
The id property
A unique identifier that may be used to identify this element as a target.
23
XDP Specification
This chapter contains a narrative description of the XML Data Packaging (XDP) grammar (About the XDP Grammar) and a reference for the XDP root element and XDP packets (XDP Element Language Syntax).
Role of XDP
The XFA components come from various sources, each corresponding to a different type of XML grammar, language (PDF), or language subassembly (annots and PDF data). In some cases, the XFA components are serialized from a DOM representation (datasets). In other cases, the XFA components come from file-based representations (templates). The source of a particular XFA component depends on whether the in-memory representation may have changed during a session. When an XFA processing application is requested to submit or export XFA components, it packages those components as an XDP document (below left) or as a single PDF document (below right). XDP and PDF can represent the same XFA form component; however, they differ in their root nodes and in the compliance with XML. That is, XDP is XML-compliant, while PDF is not.
884
XFA Specification Chapter 23, XDP Specification About the XDP Grammar 885
datasets
template
XML
XDP
An XML document
datasets
template
template
FDF (annots)
Other objects
data
Data
The most common use of XDP is to submit data to a server that expects to process XML. Such a data-only XDP document is shown at right. The types of XFA components packaged within XDP is discretionary. It can be used to submit any combination of packages containing XFA components. Packages may include custom XFA components, provided those components comply with the guidelines described later in this section.
XDP
datasets
data
XFA Specification Chapter 23, XDP Specification About the XDP Grammar 886
While extending such an application to interpret the PDF and navigate to the XML data content contained within may be straightforward, this cannot occur by solely employing commonly available XML tools such as an XML parser. The XDP format provides an alternate means of expressing the PDF document in which the outer packaging is described with an XML-based syntax, rather than a PDF-based syntax. Instances of, typically XML, subassemblies are copied from the original PDF document and expressed as a package within an XDP document. The subassemblies in the original PDF document remain unchanged. The PDF Reference [PDF] states that content in XFA packages take precedence over their counterparts embedded within the PDF package. This rules resolves the potential conflict over which content (XDP package or embedded PDF subassembly) an XDP importer should use.
XDP
datasets
XFA
3. Fred modifies data, using an XFA app that does not modify the PDF subassembly.
XDP
XFA
datasets
XFA
XDP packages the PDF document to comply with XML conventions. The PDF document is enclosed within the XDP as a region of character-encoded content because of the inability for XML to directly enclose binary content. As a result, the XDP contains all of the information that was formerly enclosed within the PDF, though some of the information may now be expressed in XML. All of the information survives the transformation process. Therefore, a PDF document can be transformed into an XDP and subsequently transformed back into a PDF document without loss of information. A benefit of the XDP format is that PDF documents can now successfully operate directly within XML workflows because the XDP format provides a means for selectively expressing a PDF document in an XML
XFA Specification Chapter 23, XDP Specification XDP Element Language Syntax 887
compatible manner without loss of information. Because the transformations are lossless, document workflows can choose arbitrarily when to process documents in a PDF format vs. when to process the same document in an XML-based format.
The name identifies the program and version of that program that generated the document.
APIVersion="version"
The version identifies the version of the scripting API for which the contained scripts were generated. The XFA 2.6 scripting API corresponds to version 2.6.7185.0. For example, the following fragment comes from an XDP generated by Adobe LiveCycle Designer 8.0.
XDP Namespace
The xdp element must belong to the namespace of http://ns.adobe.com/xdp/, which is known as the XDP namespace.
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The xdp element should make use of explicitly prefixed namespace notation rather than declaring the XDP namespace as a default namespace. If the xdp element declared the XDP namespace as the default namespace it would have the unfortunate side effect of placing any packet that lacks namespace information into the XDP namespace itself. The following example demonstrates the proper way to declare the XDP namespace.
In the above example the namespace declaration on the xdp element does not impact the default namespace and therefore the "book" fragment does not inadvertently inherit the XDP namespace. The following example illustrates the discouraged practice of an XDP that expresses the XDP namespace as the default namespace.
Important. In the above example, the xdp element is not prefixed and declares its namespace via the namespace attribute syntax of xmlns="http://ns.adobe.com/xdp/". The impact of this approach is that any descendant packet that does not declare a namespace is at risk of inheriting the XDP namespace. Concretely, in this example, the result is that the "book" fragment resides in the XDP namespace, which is problematic because such an element is certainly not a valid element of the XDP format, and downstream XML processors intending to interpret this element may no longer recognize the fragment because it has inadvertently been namespaced.
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XDP Packets
The role of an XDP packet is to encapsulate an XFA component. All child elements of the xdp element are considered to be XDP packets. Conversely, an XDP packet must be located as a child element of the xdp element. An XDP packet must not belong to the XDP namespace. The application of the XDP namespace on child elements of the xdp element is reserved for future use. This section will describe the particular packets supported by Acrobat 6.0. However, the XDP format is also able to enclose packets that are implementation-defined to a particular processing application. Acrobat 6.0 or other processing applications may ignore such packets. Consider the following example XDP.
datasets. The first packet is represented by the xfa:datasets element that encloses the XML form-data subassembly of a PDF form. pdf. The second packet is represented by the pdf element that encloses an encoded PDF form. The PDF object still retains the form-data presented in the first packet; however, the XDP packet version of the form-data takes precedence over the form-data embedded in the PDF object. my:example. The third packet is represented by the my:example element that encloses an XFA component meaningful to the creator of the XDP but does not represent a subassembly of the PDF form.
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The above example XDP also uniquely identifies the template (uuid) and indicates when the template was last modified (timeStamp).
XDP Reference
The config Element (an XDP Packet)
This packet encloses the configuration settings (Config Specification on page 752). The following shows the format of a config packet:
<xfa:config xmlns:xfa="http://www.xfa.org/schema/xci/1.0/"> XFA and application-specific configuration elements </xfa:config>
Portions of the config packet are defined elsewhere in this specification and other portions are application-defined. The config MIME-type is text/xml.
XML is a text format, and is not designed to host binary content. PDF files are binary and therefore must be encoded into a text format before they can be enclosed within an XML format such as XDP. The most common method for encoding binary resources into a text format, and the method used by the PDF packet, is base64 encoding [RFC2045].
chunk element
The chunk element must enclose a single base64 encoded PDF document. PDF content cannot be broken into smaller chunks; however, the packet may contain processing instructions that explain how to process the embedded PDF.
href
The PDF packet may contain a reference to an external file, as shown in the following example. The value of href is a URI to the original copy of the PDF document. The processing application obtains this value from the XFDF F-key path. The F-key path is relative to the system on which the PDF document was created.
Note: For security reasons an XFA processor may refuse to process a reference to an external file. Whether it does or not is application and configuration dependent.
The xdp element encloses zero or more occurrences of XFA components, each represented as an XDP packet, that is described in XDP Packets on page 889. Because the XDP format itself is comprised only of the xdp element, the functionality and behavior imparted by an XDP is wholly derived from the packets within the XDP document. It is the packets within the xdp element that is of real significance, not the xdp element itself. The xdp element may also contain any number of custom packets, distinguished from XFA packets by name and namespace. The registered xdp MIME-type is vnd.adobe.xdp+xml. This MIME-type was registered in May 2007 and is endorsed by this specification starting with XFA 2.6. However, for backward compatability all XFA
processors must also accept text/xml. This dual requirement will continue in future versions of this specification. It is expected that form creators will continue using text/xml for some time in order to remain compatible with older XFA processors.
xmlns:xdp
See XDP Namespace on page 887.
uuid
A Universally Unique Identifier (UUID), which is assigned by the template designing application and is retained by all applications that subsequently serialize (write-out) the template. The template designing application uses a product-specific algorithm to create the uuid value. See Tracking and Controlling Templates Through Unique Identifiers on page 471.. The uuid attribute inherits the namespace of its container, which in this case is xdp. If the XDP does not contain a template packet, the uuid attribute is meaningless.
timeStamp
A date-time value that follows the ISO8601 convention: YYYY-MM-DDTHH:MM:SS z. The value of timeStamp specifies when the XFA template was last modified, as described in Tracking and Controlling Templates Through Unique Identifiers on page 471. where:
The capital letter "T" separates the date and time "z" represents the time zone designator (Z or +hh:mm or -hh:mm) - following UTC or using local time. For example: 1994-11-05T08:15:30-05:00 corresponds to November 5, 1994, 8:15:30 am, US Eastern Standard Time. Extending this example, 1994-11-05T13:15:30Z corresponds to the same instant.
The timeStamp attribute inherits the namespace of its container, which in this case is xdp. If the XDP does not contain a template packet, the timeStamp attribute is meaningless.
The xmpmeta MIME-type is application/rdf+xml. For information about the specific metadata inserted into the XMP packet by Adobe LiveCycle Designer, see XMP packet on page 1065.
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Letters are placeholders for a numeric value. Square brackets enclose an optional portion of the format. All other characters should be assumed to be literal characters.
Date
Dates must be expressed in any of the following forms:
YYYY[MM[DD]] YYYY[-MM[-DD]]
Symbol YYYY MM DD
Meaning Zero-padded 4-digit year. Zero-padded 2 digit (01-12) month of the year. Zero-padded 2 digit (01-31) day of the month.
The above symbols echo the date picture-clause symbols; however, they serve only to describe (to the reader) expected values.
Notes The only punctuation character that is acceptable between date components is the hyphen character (Unicode character U+002D.
Not all of these formats constitute a date to the precision of an actual day, hence it is up to the application to determine whether "1997-07" is an acceptable date, i.e. is the application looking for a particular day, in which case 1997-07 is not precise enough because it doesn't specify a day.
Time
Time must be expressed in any of the following forms:
HH[MM[SS[.FFF][z]]] HH[MM[SS[.FFF][+HH[MM]]]] HH[MM[SS[.FFF][-HH[MM]]]] HH[:MM[:SS[.FFF][z]]] HH[:MM[:SS[.FFF][-HH[:MM]]]] HH[:MM[:SS[.FFF][+HH[:MM]]]]
Meaning Zero-padded 2 digit (00-23) hour of the day, expressed as a 24-hour clock. (The meridiem symbols AM and PM are not supported.) 2-digit (00-59) minute of the hour. 2-digit (00-59) second of the minute. Decimal fraction of a second. Any fraction of a second is always preceded by a dot (Unicode character U+002E) and must include exactly 3 digits. [ISO-8601] time-zone format: Z, +HH[MM], or -HH[MM]. In the examples on page 900, H is a placeholder for an hour digit, and the M is a placeholder for a minute digit. The value for z may have the following values:
Omitted. If time zone is omitted, states a local time with an unknown time zone. Omitting the time zone information may cause a time data value to be useless to applications that operate within other timezones. Producing time data that omit timezone designators is discouraged. Z. A time zone of 'Z' (Unicode character U+005A) indicates the time zone is 'zero meridian', or 'Zulu Time'. The [ISO-8601] section titled Universal Time Coordinated describes a method of defining time absolutely. Another helpful document is A Few Facts Concerning GMT, UT, and the RGO, by R. Langley, 20 January 1999, which is available at http://www.apparent-wind.com/gmt-explained.html. +HH[MM] or -HH[MM]. A time zone expressed as an offset of plus or minus states that the offset can be added to the time to indicate that the local time zone is HH hours and MM minutes ahead or behind GMT. The plus or minus sign must be included.
The symbols in the above table echo the time picture-clause symbols; however, they serve only to describe (to the reader) expected values.
Notes The only punctuation character that is acceptable between the hours, minutes, and seconds components is the colon character (Unicode character u003a).
Date-Time
A date and time specified according to the previous sections can be combined into a single date-time value by concatenating the values together, separated by a 'T' (Unicode character U+0054). The requirement for the 'T' character is a particularly annoying and controversial part of the [ISO-8601] specification; but that's the way it is. If the 'T' is deemed confusing to human users, then the software should take care of transforming the 'T' in and out of existence during read/writes of data.
Number
A number literal is a sequence of mostly digits consisting of an integral part, a decimal point, a fractional part, an e (or E) and an optionally signed exponent part.
(['+'|'-'])['0'-'9']*('.')(['e'|'E']('+'|'-')['0'-'9']*) (['+'|'-'])(['0'-'9']*)'.'['0'-'9']*(['e'|'E']('+'|'-')['0'-'9']*)
where the symbols in the above expressions are described in Notational Conventions on page 906. Examples of canonical numbers appear below:
1 +1 1234 -1234 1 E100 1234 e-4 -1.e-3 1234.E+10 2.1 +.1234 -.12e2
It is important to distinguish canonical format from issues related to the conversion of a canonical number into a representation specific for a number type, such as integer, float, decimal, and boolean. Such conversion reflects the containers value properties and application-dependent issues such as precision.
Text
The canonical format for text is any sequence of Unicode characters. Note that there is no Unicode character assigned to code point U+0000 and this code point is forbidden in XFA.
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FormCalc Specification
This document, as part of a family of specifications referred to as the XML Forms Architecture, describes an XML based language, XFA-Template, for modeling electronic form templates. XFA provides for the specific needs of electronic forms and the applications that use them. XFA addresses the needs of organizations to securely capture, present, move, process, output and print information associated with electronic forms. This document specifically describes a simple calculation language optimized for creating e-form centric logic and calculations.
Language Overview
FormCalc is a simple calculation language whose roots lie in electronic form software from Adobe, and common spreadsheet software. It is an expression-based language. It is also a type less language, where values of type string or type number can be promoted to strings, numbers or booleans to suit the context. FormCalc is tailored to the skills of the non-programmer who is comfortable with spreadsheet-class application software. This user can, with the addition of a few expressions, validate user input and/or unburden the form user from the spreadsheet-like calculations. To that aim, the language provides a large set of built-in functions to perform arithmetic, and financial tasks. Locale-sensitive date and time functions are provided, as are string manipulation functions. To better illustrate the capabilities of the FormCalc language, we present a simple purchase order application, and focus on those spreadsheet like calculations and validations typically required of such forms.
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Down-pointing call-outs indicate all the field names on this form. In the tabular area of the form are four fields called Item, four fields called Quantity, four fields called Price, and four fields called Amount. We will focus on these shortly. Green up-pointing call-outs indicate fields with embedded calculations, and the red up-pointing call-outs indicate fields with embedded validations. A subset of the XFA template syntax used to define this purchase order form might be as follows.
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<validate> <script>Within($, 0, 19)</script> </validate> </field> <field name="Price"> ... </field> <field name="Amount"> <calculate> <script>Quantity * Price</script> </calculate> </field> <field name="Item"> ... </field> <field name="Quantity"> <validate> <script>Within($, 0, 19)</script> </validate> </field> <field name="Price"> ... </field> <field name="Amount"> <calculate> <script>Quantity * Price</script> </calculate> </field> <field name="Item"> ... </field> <field name="Quantity"> <validate> <script>Within($, 0, 19)</script> </validate> </field> <field name="Price"> ... </field> <field name="Amount"> <calculate> <script>Quantity * Price</script> </calculate> </field> </subform> <subform Name="Summary" ...> <field name="ShipDate"> <calculate> <script>Num2Date(Date() + 2, DateFmt())</script> </calculate> </field> <field name="Total"> <calculate> <script>Str(Sum(Amount[*]), 10, 2)</script> </calculate> </field> </subform> </subform> </template> </xfa>
Focusing our attention on the contents of the <script> elements, we see text such as the following, all of which are real-world examples of form calculations.
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Script
Within($, 0, 19) Quantity * Price Num2Date(Date() + 2, DateFmt()) Str(Sum(Amount[*]), 10, 2)
What it does (further explanation follows) Ensures that the entered field value is within the range of 0 to 19 Computes the product of two fields Displays a date that is two days hence from the current date Sums all occurrences of the field Amount, formats the resulting number to have a precision of two decimal places in a string, and then adds spaces to make the number 10 characters wide
Some of these expressions are continually being re-executed as the user interacts with the form and enters new data. On each of the four Quantity fields is the validation:
Within($, 0, 19)
This is used to limit the user's input to between 0 and 19 items. Any other value entered in these fields will cause a validation error, requiring the user to modify his input. Here the symbol $ is an identifier that refers to the value of the field to which this form calculation is bound; in this case, the Quantity field. On each of the four Amount fields is the calculation:
Quantity * Price
which multiplies the value of the Quantity field by the value of the Price field on that row, and stores the resulting product in the Amount field. Whenever the user changes any of the quantity fields, this calculation is re-executed and the new value is displayed in the corresponding Amount field. Below the column of Amount fields is the Total field. It contains the calculation:
Str(Sum(Amount[*]), 10, 2)
This sums all occurrences of the field Amount, and formats the resulting number to two decimal places in a string, 10 characters wide. Whenever any of the amount fields change, this calculation is re-executed and a new value is displayed in the Total field. Finally, the field named ShipDate also contains a calculation, specifically, a date calculation
Num2Date(Date() + 2, DateFmt())
This calculation gets the value of the current date (in days), adds 2 days to it and then formats this date value into a locale-sensitive date string. Were that user to be in the United States, in the year 2000, and on the ides of March, the result that would be displayed in the ShipDate field, is:
Mar 17, 2000
A user in Germany, on that same day, would see the following value displayed in the same field.
17.03.2000
The above is an illustration of the built-in internationalization capabilities of FormCalc's date and time functions.
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Admittedly, this is a very simple application. A real-world purchase order form would be significantly more complex, with perhaps several dozen calculations and validations. Hopefully this example will suffice to introduce some of the capabilities of the FormCalc language. We will now proceed to formalize the definition of this language. More complex language examples will be presented throughout.
Grammar
The FormCalc language is defined in terms of a context-free grammar. This is a specification of the lexical and syntactic structure of FormCalc calculations. A context-free grammar is defined as a number of productions. Each production has an abstract symbol called a nonterminal as its left-hand side, and a sequence of one or more nonterminal and terminal symbols as its right-hand side. The grammar specifies the set of possible sequences of terminal symbols that can result from repeatedly replacing any nonterminal in the sequence with a right-hand side of a production in which the nonterminal is the left-hand side.
Notational Conventions
The following convention in notation is used to describe the grammar of FormCalc: Metasymbol ::= Description Start of the definition of a nonterminal symbol. Alternative symbol. One from the set of enclosed symbol(s). Range of symbols. Syntax example
FormCalculation ::= ExpressionList defines the production FormCalculation as an ExpressionList symbol. '+' | '-' allows alternate additive operator symbols. ['E' 'e'] allows one symbol from the set 'E', 'e' of symbols. ['0''9'] allows one symbol from the consecutive set '0', '1', ..., '9' of symbols. Character \ LineTerminator allows one symbol from the set of Characters that is not a LineTerminator symbol.
symbol \symbol
(symbol )
One occurrence of the enclosed ( '+' | '-' ) allows for one occurrence of symbol(s). either alternative symbol.
( ',' SimpleExpression )* allows for zero Zero or more occurrences of the or more occurrence of the ',' symbol followed by a enclosed symbol(s). SimpleExpression symbol.
(symbol )*
(symbol )?
The nonterminal symbols of the grammar are always in normal print, often sub scripted by a production key, e.g., ProductionName[ProductionKey], as in LogicalAndExpression70. The terminal symbols of the grammar are always enclosed in single quotes, as in '=' and 'then'.
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Lexical Grammar
This section describes the lexical grammar of the FormCalc language. It defines a set of productions, starting from the nonterminal symbol Input1, to describe how sequences of Unicode characters are translated into a sequence of input elements. The grammar has as its terminal symbols the characters of the Basic Multilingual Plane (BMP) of the [Unicode-2.1] character set; this limitation allows us to hold onto the "one character = one storage unit" paradigm the original Unicode standard promised, a bit longer. Input elements other than white spaces, line terminators and comments form the terminal symbols for the syntactic grammar of FormCalc, and are called tokens. These tokens are the literals, identifiers, keywords, separators and operators of the FormCalc language.
1 Input ::= WhiteSpace | LineTerminator | Comment | Token
The source text for a FormCalc calculation is a sequence of characters using the Unicode character encoding. These Unicode characters are scanned from left to right, repeatedly taking the longest possible sequence of characters as the next input element.
2 Character ::= [#x9-#xD] | [#x20-#xD7FF] | [#xE000-#xFFFD]
Note: Not all FormCalc hosting environments recognize these characters, e.g., XML does not allow the vertical tab (#xB) and form feed (#xC) characters as input.
White Space
White space characters are used to separate tokens from each other and improve readability but are otherwise insignificant.
3 WhiteSpace ::= #x9 | #xB | #xC | #x20
These are the horizontal tab (#x9), vertical tab (#xB), form feed (#xC), and space (#x20) characters.
Line Terminators
Line terminators, like white spaces are used to separate tokens and improve readability but are otherwise insignificant.
4 LineTerminator ::= #xA | #xD
These are the linefeed (#xA), and carriage return (#xD) characters.
Comments
Comments are used to improve readability but are otherwise insignificant. A comment is introduced with a semi-colon (;) character, or a pair of slash (/) characters, and continues until a line terminator is encountered.
5 Comment ::= ';' ( Character \ LineTerminator )* | '/' '/' ( Character \ LineTerminator )*
Note: Notational Conventions on page 906 explains the significance of the * and ? symbols.
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String Literals
A string literal is a sequence of Unicode characters enclosed within double quote characters, e.g., "the cat jumped over the fence." The string literal "" defines an empty sequence of text characters called the empty string. To embed a double quote within a string literal, specify two double quote characters, as in "He said ""She said.""". Moreover within string literals, any Unicode character may be expressed as a Unicode escape sequence of 6 characters consisting of \u followed by four hexadecimal digits, e.g.,
"\u0047\u006f \u0066\u0069\u0073\u0068\u0021"
To embed a control character with a string literal, specify its Unicode escape sequence, e.g., specify \u000d for a carriage return, and \u000a for a newline character.
6 7 HexDigit ::= ['0'-'9'] | ['m'-'f'] | EscapedCharacter ::= '"' '"' | '\' 'U' HexDigit HexDigit HexDigit '\' 'U' HexDigit HexDigit HexDigit StringLiteral ::= '"' ( Character \ ['A'-'F'] HexDigit | HexDigit HexDigit HexDigit HexDigit HexDigit ['"'] | EscapedCharacter )* '"'
Note: Notational Conventions on page 906 explains the significance of the * and ? symbols.
Number Literals
A number literal is a sequence of mostly digits consisting of an integral part, a decimal point, a fractional part, an e (or E) and an optionally signed exponent part. Either the integral part or the fractional part may be missing, but not both. In the fractional part, either the decimal point or the e and exponent part may be missing, but not both.
9 Integer ::= ['0'-'9']+ ( ['0'-'9'] )* 10 Exponent ::= ['E' 'e'] ['+' '-']? Integer 11 NumberLiteral ::= Integer '.' ['0'-'9']* Exponent? | '.' Integer Exponent? | Integer Exponent? | 'nan' | 'inf'
Note: Notational Conventions on page 906 explains the significance of the * and ? symbols. Examples of number literals include 12, 1.2345, .12, 1e-2, and 1.2E+3. All number literals are internally converted to [IEEE754] 64-bit binary values. However, IEEE 754 values can only represent a finite quantity of numbers.Just as some numbers, such as 1/3, are not representable precisely as decimal fractions, other numbers are not precisely representable as binary fractions. Specifically, but not limited to, number literals having more than 16 significant digits in the non-exponent part will be the rounded to the nearest representable IEEE 754 64-bit value using a round-to-nearest mechanism. The following table provides examples of such rounding imprecision, all of which are conformant to the IEEE 754 standard. Input number 123456789.012345678 99999999999999999 Is rounded to 123456789.01234567 100000000000000000
Such rounding behavior behaviour can sometimes lead to surprising results. FormCalc provides a function, Round(), which returns a given number rounded to a given number of decimal places. When the given number is exactly halfway between two representable numbers, it is rounded away from zero; up if positive, and down if negative.
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returns 0.05. It doesn't. 0.045 cannot be exactly represented in a finite number of bits. IEEE 754 dictates that the number literal 0.045 be approximated to 0.0449999999999999 This approximation is closer to 0.04 than to 0.05, so
Round(0.045, 2)
returns 0.04. This too is conformant to the IEEE 754 standard. IEEE 754 64-bit values also support representations like NaN (not a number), +Inf (positive infinity), and -Inf (negative infinity). FormCalc does not support these; currently, any intermediate expression that evaluates to NaN, +Inf, or -Inf results in an error exception which is propagated in the remainder of the expression. This behaviour may change in future.
Literals (General)
12 NullLiteral ::= 'null' 13 Literal ::= StringLiteral | NumberLiteral| NullLiteral
Identifiers
An identifier is a sequence of characters of unlimited length but always beginning with an alphabetic character, or an underscore (_) character, or a dollar sign ($) character, or an exclamation mark (!) character. FormCalc identifiers are case sensitive, i.e., identifiers whose characters only differ in case, are considered distinct. Case sensitivity is mandated by FormCalc's hosting environments.
14 Identifier ::= ( AlphabeticCharacter | '_' | '$' | '!' ) ( AlphaNumericCharacter1 | '_' | '$' )
1. An alphabetic character is any Unicode character classified as a letter in the Basic Multilingual Plane (BMP). An alphanumeric character is any Unicode character classified as either a letter or digit in the BMP.
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Keywords
Keywords in FormCalc are reserved words and are case insensitive. Of these, the 'if', 'then', 'elseif', 'else', 'endif' keywords delimit the parts of an If Expressions.The 'nan' and 'inf' keywords denote special number literals, whereas the 'null' keyword denotes the null literal. The 'this' keyword denotes a specific accessor.The remaining keywords are keyword operators. The following are keywords and may not be used as identifiers:
15 Keyword ::= 'if' | 'then' | 'elseif' | 'else' | 'endif' | 'or' | 'and' | 'not' | 'eq' | 'ne' | 'le' | 'ge' | 'lt' | 'gt' | 'this' | 'null' | 'nan' | 'infinity'
16 ReservedKeyword ::= | 'while' | 'do' | 'endwhile' | 'end' | 'for' | 'upto' | 'downto' | 'step' | 'endfor' | 'foreach | 'in' | 'break' | 'continue' | 'var' | 'func' | 'endfunc' | 'throw' | 'return' | 'exit'
Operators
FormCalc defines a number of operators; they include unary operators, multiplicative operators, additive operators, relational operators, equality operators, logical operators, and the assignment operator. FormCalc operators are symbols common to most other scripting languages:
17 Operator ::= '=' | '|' | '&' | '==' | '<>' | '<=' | '>=' | '<' | '>' | '+' | '-' | '*' | '/'
Several of the FormCalc operators have an equivalent mnemonic operator keyword. These keyword operators are useful whenever FormCalc expressions are embedded in HTML and XML source text, where symbols <, >, and & have predefined meanings and must be escaped. Here's an enumeration of all FormCalc operators, illustrating the symbolic and mnemonic forms of various operators.
18 19 20 21 22 23 24 LogicalOrOperator ::= '|' | 'or' LogicalAndOperator ::= '&' | 'and' EqualityOperator ::= '==' | '<>' | 'eq' | 'ne' RelationalOperator ::= '<=' | '>=' | '<' | '>' | 'le' | 'ge' | 'lt' | 'gt' AdditiveOperator ::= '+' | '-' MultiplicativeOperator ::= '*' | '/' UnaryOperator ::= '-' | '+' | 'not'
Tokens
25 Separator ::= '(' | ')' | '[' | ']' | ',' | '.' | '..' | '.#' | '.*' 26 Token ::= Literal | Keyword | Identifier | Operator | Separator
Syntactic Grammar
The syntactic grammar for FormCalc has the tokens defined in the preceding lexical grammar as its terminal symbols. It defines the set of productions, starting from the nonterminal symbol FormCalculation, to describe how sequences of tokens can form a syntactically valid calculation. The following subsections describe the expressions in this syntactic grammar.
27 FormCalculation ::= ExpressionList
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28 ExpressionList ::= Expression | ExpressionList Expression 29 Expression ::= IfExpression | WhileExpression | ForExpression | ForEachExpression | AssignmentExpression | DeclarationExpression | SimpleExpression 30 SimpleExpression ::= LogicalOrExpression 31 LogicalOrExpression ::= LogicalAndExpression | LogicalOrExpression LogicalOrOperator LogicalAndExpression 32 LogicalAndExpression ::= EqualityExpression | LogicalAndExpression LogicalAndOperator EqualityExpression 33 EqualityExpression ::= RelationalExpression | EqualityExpression EqualityOperator RelationalExpression 34 RelationalExpression ::= AdditiveExpression | RelationalExpression RelationalOperator AdditiveExpression 35 AdditiveExpression ::= MultiplicativeExpression | AdditiveExpression AdditiveOperator MultiplicativeExpression 36 MultiplicativeExpression ::= UnaryExpression | MultiplicativeExpression MultiplicativeOperator UnaryExpression 37 UnaryExpression ::= PrimaryExpression | UnaryOperator UnaryExpression 38 LogicalOrOperator ::= '|' | 'or' 39 LogicalAndOperator ::= '&' | 'and' 40 EqualityOperator ::= '==' | '<>' | 'eq' | 'ne' 41 RelationalOperator ::= '<=' | '>=' | '<' | '>' | 'le' | 'ge' | 'lt' | 'gt' 42 AdditiveOperator ::= '+' | '-' 43 MultiplicativeOperator ::= '*' | '/' 44 UnaryOperator ::= '-' | '+' | 'not' 45 PrimaryExpression ::= Literal | FunctionCall | Accessor ( '.*' )? | '(' SimpleExpression ')' 46 IfExpression ::= 'if' '(' SimpleExpression ')' 'then' ExpressionList ('elseif' '(' SimpleExpression ')' 'then' ExpressionList )* ('else' ExpressionList )? 'endif'
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47 WhileExpression ::= 'while' '(' SimpleExpression ')' 'do' ExpressionList 'endwhile' 48 ForExpression ::= 'for' Assignment 'upto' Accessor ('step' SimpleExpression)? 'do' ExpressionList 'endfor' | 'for' Assignment 'downto' Accessor ('step' SimpleExpression)? 'do' ExpressionList 'endfor' 49 ForeachExpression ::= 'foreach' Identifier 'in' '(' ArgumentList ')' 'do' ExpressionList 'endfor' 50 BlockExpression ::= 'do' ExpressionList 'end' 51 ContinueExpression ::= 'continue' 52 BreakExpression ::= 'break' 53 ParameterList 54 DeclarationExpression ::= 'var' Variable | 'var' Variable '=' SimpleExpression | 'Func' Identifier '(' ParameterList ')' do ExpressionList 'EndFunc' 55 AssignmentExpression ::= Accessor '=' SimpleExpression 56 FunctionCall ::= Function '(' ( ArgumentList )? ')' 57 Function ::= Identifier 58 Accessor ::= Container | Accessor [ '.' '..' '.#' ] Container 59 Container ::= Identifier | Identifier ' [' '*' ']' | Identifier '[' SimpleExpression ']' | MethodCall 60 ContainerList ::= Container (',' Container)* 61 MethodCall ::= Method '(' ( ArgumentList )? ')' 62 Method ::= Identifier 63 ArgumentList ::= SimpleExpression (',' SimpleExpression )*
Basic Expressions
Expressions Lists
64 FormCalculation ::= ExpressionList 65 ExpressionList ::= Expression | ExpressionList Expression
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A FormCalculation64 is a list of expressions. Under normal circumstances, each Expression66 evaluates to a value, and the value of an ExpressionsList65 is the value of the last expression in the list.
Assuming the example is the calculation for a field, after the above expression list is evaluated the value of the associated field is 50.
Simple Expressions
66 Expression ::= SimpleExpression | ... 67 SimpleExpression ::= LogicalOrExpression
Operator Precedence
Operator precedence rules behave as expected. Enumerating all the FormCalc operators in order, from high precedence to lowest precedence yields: = (unary) - + not * / + - < <= > >= lt le gt ge == <> eq ne & and | or
Evaluates to 50 1
Evaluates to 15 1 8
Explanation
"abc" converts to 0 "100" converts to 100 null converts to 0
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All the intermediate results of numeric expressions are evaluated as double precision IEEE 754 64 bit values. The final result is displayed with up to 11 fractional digits of precision. Should an intermediate expression yield an NaN, +Inf or -Inf,FormCalc will currently generate an error exception and propagate that error for the remainder of that expression, and the expression's value will always be zero.
Logical Or Expressions
68 LogicalOrExpression ::= LogicalAndExpression | LogicalOrExpression LogicalOrOperator LogicalAndExpression 69 LogicalOrOperator ::= '|' | 'or'
A LogicalOrExpression68returns the result of a logical disjunction of its operands, or null if both operands are null. If not both null, the operands are promoted to numeric values, and a numeric operation is performed. The LogicalOrOperators '|' and 'or', represent the same logical-or operator. The logical-or operator returns the boolean result true, represented by the numeric value 1, whenever either operand is not 0 and returns the boolean result false, represented by the numeric value 0, otherwise.
A LogicalAndExpression70returns the result of a logical conjunction of its operands, or null if both operands are null. If not both null, the operands are promoted to numeric values, and a numeric operation is performed.
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The LogicalAndOperators '&' and 'and', both represent the same logical-and operator. The logical-and operator returns the boolean result true, represented by the numeric value 1, whenever both operands are not 0 and returns the boolean result false, represented by the numeric value 0, otherwise.
Equality Expressions
72 EqualityExpression ::= RelationalExpression | EqualityExpression EqualityOperator RelationalExpression 73 EqualityOperator ::= '==' | '<>' | 'eq' | 'ne'
An EqualityExpression72returns the result of an equality comparison of its operands. If either operand is null, then a null comparison is performed. Null valued operands compare identically whenever both operands are null, and compare differently whenever one operand is not null. If both operands are references (References on page 920), then both operands compare identically when they both refer to the same object, and compare differently when they don't refer to the same object. If both operands are string valued, then a locale-sensitive lexicographic string comparison is performed on the operands. Otherwise, if not both null, the operands are promoted to numeric values, and a numeric comparison is performed. The EqualityOperators '==' and 'eq', both denote the equality operator. The equality operator returns the boolean result true, represented by the numeric value 1, whenever both operands compare identically and returns the boolean result false, represented by the numeric value 0, otherwise. The EqualityOperators '<>' and 'ne', both denote the inequality operator. The inequality operator returns the boolean result true, represented by the numeric value 1, whenever both operands compare differently and returns the boolean result false, represented by the numeric value 0, otherwise.
Relational Expressions
74 RelationalExpression ::= AdditiveExpression | RelationalExpression RelationalOperator AdditiveExpression 75 RelationalOperator ::= '<=' | '>=' | '<' | '>' | 'le' | 'ge' | 'lt' | 'gt'
A RelationalExpression74returns the result of a relational comparison of its operands. If either operand is null valued, then a null comparison is performed. Null valued operands compare identically whenever both operands are null and the relational operator is less-than-or-equal or greater-than-or-equal, and compare differently otherwise. If both operands are string valued, then a locale-sensitive lexicographic string comparison is performed on the operands. Otherwise, if not both null, the operands are promoted to numeric values, and a numeric comparison is performed. The RelationalOperators '<' and 'lt', both denote the same less-than operator. The less-than-or-equal relational operator returns the boolean result true, represented by the numeric value 1, whenever the first operand is less than the second operand, and returns the boolean result false, represented by the numeric value 0, otherwise. The RelationalOperators '<=' and 'le', both denote the less-than-or-equal operator. The less-than-or-equal relational operator returns the boolean result true, represented by the numeric value 1, whenever the first operand is less than or equal to the second operand, and returns the boolean result false, represented by the numeric value 0, otherwise.
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The RelationalOperators '>' and 'gt', both denote the same greater-than operator. The greater-than relational operator returns the boolean result true, represented by the numeric value 1, whenever the first operand is greater than the second operand, and returns the boolean result false, represented by the numeric value 0, otherwise. The RelationalOperators '>=' and 'ge', both denote the greater-than-or-equal operator. The greater-than-or-equal relational operator returns the boolean result true, represented by the numeric value 1, whenever the first operand is greater than or equal to the second operand, and returns the boolean result false, represented by the numeric value 0, otherwise.
Additive Expressions
76 AdditiveExpression ::= MultiplicativeExpression | AdditiveExpression AdditiveOperator MultiplicativeExpression 77 AdditiveOperator ::= '+' | '-'
An AdditiveExpression76returns the result of an addition (or subtraction) of its operands, or null if both operands are null. If not both null, the operands are promoted to numeric values, and a numeric operation is performed. The AdditiveOperator '+', is the addition operator; it returns the sum of its operands. The AdditiveOperator '-', is the subtraction operator; it returns the difference of its operands.
Multiplicative Expressions
78 MultiplicativeExpression ::= UnaryExpression | MultiplicativeExpression MultiplicativeOperator UnaryExpression 79 MultiplicativeOperator ::= '*' | '/'
A MultiplicativeExpression78returns the result of a multiplication (or division) of its operands, or null if both operands are null. If not both null, the operands are promoted to numeric values, and a numeric operation is performed. The MultiplicativeOperator '*', is the multiplication operator; it returns the product of its operands. The MultiplicativeOperator '/', is the division operator; it returns the quotient of its operands.
Unary Expressions
80 UnaryExpression ::= PrimaryExpression | UnaryOperator UnaryExpression 81 UnaryOperator ::= '-' | '+' | 'not'
A UnaryExpression80 returns the result of a unary operation of its operand. The UnaryOperator '-' denotes the unary minus operator; it returns the arithmetic negation of its operand, or null if its operand is null. If its operand is not null, it is promoted to a numeric value, and the unary minus operation is performed. The UnaryOperator '+' denotes the unary plus operator; it returns the arithmetic value of its operand, or null if its operand is null. If its operand is not null, it is promoted to a numeric value, and the unary plus operation is performed. The UnaryOperator 'not' denotes the logical negation operator. it returns the logical negation of its operand. Its operand is promoted to a boolean value, and the logical operation is performed.
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The logical negation operation returns the boolean result true, represented by the numeric value 1, whenever its operand is 0, and returns the boolean result false, represented by the numeric value 0, otherwise. Note: The arithmetic negation of a null operand yields the result null, whereas the logical negation of a null operand yields the boolean result true. This is justified by the common sense statement: If null means nothing then "not nothing" should be something.
Primary Expressions
82 PrimaryExpression ::= Literal | Accessor | MethodCall | '(' SimpleExpression ')'
A PrimaryExpression82 is the building block of all simple expressions. It consists of literals, variables, accessors, function calls, and parenthesized simple expressions. The value of the PrimaryExpression is the value of its constituent Literal13, Accessor90, SimpleExpression67.
Assignment Expressions are described on page 918. Variables and user-defined functions are objects that reside in FormCalc storage, as opposed to objects that reside in the processing application's object model. Each variable or function has a scope, which is that region of a FormCalculation where the variable is known. The scope of a variable begins at its declaration and persists to the end of a block. See Block Expressions, Explicit and Implied on page 926.
Variables
One kind of DeclarationExpression83defines a FormCalc variable identified by the Variable identifier and assigns it the value of the SimpleExpression67 if included, or the empty string value if the SimpleExpression is omitted. The value of this kind of DeclarationExpression is the value assigned to the variable. In the following example, the variable comes into existence and is given the empty string value, before the SimpleExpression is ever evaluated.
When used on the left-hand side of an AssignmentExpression85, the storage contents of the variable identified are modified, and when used in a SimpleExpression67, the storage contents of the variable identified are retrieved.
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The names of FormCalc variables are case sensitive. Thus, in the following valid example, variables A and a coexist.
User-Defined Functions
Another kind of DeclarationExpression83defines a FormCalc user-defined function. Such a declaration is identified by the func identifier. It also allocates memory for passing parameters to the function and for the expressions bracketed by the do and endfunc expressions. The value returned from the function is the last value calculated by the function. That is, there is not return statement, as with C-language functions. If FormCalc provides a built-in function with the same name as a user-defined function, FormCalc invokes the built-in function. The following example shows a function being declared and that same function being called.
Assignment Expressions
86 Expression ::= AssignmentExpression | ... 87 AssignmentExpression ::= Accessor '=' SimpleExpression
An AssignmentExpression[87 sets the property identified by the Accessor90 to the value of the SimpleExpression67. The value of the AssignmentExpression87 is the value of the SimpleExpression67.
Accessors
88 PrimaryExpression ::= Accessor ( '.*' )? | ... 89 AssignmentExpression ::= Accessor '=' SimpleExpression | ... 90 Accessor ::= Container | Accessor [ '.' '..' '.#' ] Container 91 Container ::= Identifier | Identifier '[' '*' ']' Identifier '[' SimpleExpression ']' | MethodCall
FormCalc provides access to object properties and values, which are all described in Scripting Object Model on page 74. An Accessor90is the syntactic element through which object values and properties are assigned, when used on the left-hand side of an AssignmentExpression89, or retrieved, when used in a SimpleExpression67.
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The object property is indicated by the use of the '.#' separator. Accessors may equally consist of a partially qualified hierarchy of objects, again optionally followed by an object property, as in:
Invoice..edge[1].color.#value = "255,9,9"
The hierarchy is indicated by the use of the '..' separator. When terminated with the '.*' separator, instead, what is referred to is the collection of sub-objects of the object identified by the accessor. A container is simply the name of an object or object property. A hierarchy of objects presupposes the architectural model described in Scripting Object Model on page 74. Such a model is important because there can be multiple instances of objects with the same name on a form, each instance gets assigned an occurrence number, starting from zero. To refer to a specific instance of an object which bears the same ambiguous name as other objects, it is required that the name be qualified by an occurrence number corresponding to the desired ordinal instance of the object. Aside from a referral to the absolute occurrence of an object, there also exists the need to refer to the relative occurrence of an object, and to all occurrences of an object. To that end, FormCalc uses the notation: Notation
Identifier
Refers to An occurrence of the object that bears the same ordinal occurrence number as the referencing object. The occurrence of the object identifiedby the runtime value of the expression. N'th succeeding occurrence of the object identified by the runtime value of the expression, relative to the referencing object's occurrence number. N'th preceding occurrence of the object identified by the runtime value of the expression, relative to the referencing object's occurrence number. Every occurrence of the identified object.
Identifier[- ( SimpleExpression )]
Identifier[*]
Thus, Identifier[0] refers to the first occurrence of the identified object, and by convention,Identifier[+0] and Identifier[-0] refer to the object whose occurrence number is the same as the referencing object. The notation Identifier [ SimpleExpression ]involves an indexing operation, which must yield a numeric result. If the SimpleExpression67 operand is non-numeric, then it will be promoted to a number
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using the rule for a SimpleExpression; if the non-numeric indexing operand can be fully converted to a numeric value then that is its value; otherwise its value is zero (0), and, when promoting a null-valued indexing operand to a number, its value is always zero. Some accessor expressions can often evaluate to a set of values, and some built-in functions, such as the following, are designed to accept a set of values.
Avg(), Count(), Max(), Min(), Sum(), and Concat()
However, it is not always possible to determine the exact number of arguments passed to a function at time of compilation. For example, consider the following form calculation Max(Price[*]). If there are no occurrences of object Price, then the function Max() will generate an error exception. If there is a single occurrence of object Price, then the function Max() will return the value of that object occurrence. If there are multiple occurrences of object Price, then the function Max() will return the maximum value of all those object occurrences. For all occurrences of a given object to be included in a calculation, the object must be specified using the [*]-style of accessor referral.
Result Sums all occurrences of object Price Sums a single occurrence of object Price
In most other built-in functions, the description of the formal arguments stipulates that it must be a single value, but it may be that the passed argument evaluates to a set of values. In such circumstances, the function will generate an error exception. This rule applies to all binary and unary operands involving accessors that use the [*]-style of referral.
Result Generates an error exception, irrespective of the number of occurrences of object Quantity Generates an error exception, respectively of the number of occurrences of object Quantity
As noted earlier, the dollar sign ($) character is a valid character in Identifier names (Identifiers). However, this specification recommends that processing applications forbid including the dollar sign ($) character in the names of objects and properties object names and properties containing this character can thus be reserved for special application-defined tasks.
References
In the processing application's model hierarchy, not all objects simply have values. Many only contain sub-objects. It is often useful to manipulate objects indirectly, rather than through explicitly named accessors, particularly if such objects are difficult and/or expensive to locate. The mechanism for indirectly manipulating an object in FormCalc is called a reference.
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Simply stated, references are handles to existing model objects. When a reference is:
assigned to variable, passed as an argument to a method or function, returned from a method or function, compared for equality and inequality, or further qualified by an accessor or method,
some special rules apply. In all other contexts where a reference is used, it simply refers to the value of the object it's handling at the time.
Assignment of References
For variable V, expression e and object O, the assignment var V = e is evaluated as follows:
If expression e is a reference, variable V becomes a reference to the same object referred to by e; otherwise, if e is a null reference, V becomes a variable with the value null; If expression e is not a reference, and variable V is a reference, then the value of the object referred to by variable V becomes the value e; Otherwise, variable V becomes the value e.
The following table illustrates the evaluation of var V = e, given different combinations of referencing. The symbol & designates a reference to an object, and designates the de-referencing of an object then we have the following table: Variable V Reference Variable e contains Reference to an object Null value Non-null value Non-reference Reference to an object Null value Non-null value var V = e V = &O V = null V = e V = &O V = null V=e evaluates as
The light grey cells denote variables that result in references, whereas, the yellow cells denote variables that result in values. To summarize then, when a variable is been assigned a valid reference, the variable becomes a reference. It stays a reference until its assigned the null-reference, or goes out of scope. This principle is illustrated in the following sequence.
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q = null q = Ref(null) q = 5
// object ShipDate is assigned the value null. // q is now a null-reference. // variable q is assigned the value 5.
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The following assignment expressions each set the value of field Price[1] to the value of field Price[2].
Control Expressions
Break Expressions
92 BreakExpression ::= 'break'
A break expression causes an immediate exit from the innermost enclosing while, for, or foreach expression loop. Control passes to the expression following the terminated loop.
Example 25.26 Code fragment that sums the receipts up to a maximum value, using continue and break expressions
var total = 0.0 foreach receipt in ( travel_receipt[*], parking_receipt[*] ) do if (receipt lt 5) then continue // Causes a jump to the next iteration of the foreach loop. endif total = total + receipt if (total gt 1000) then total = 1000 break // Causes execution to drop out of the foreach loop. endif endfor
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The value of the break expression is always the value zero (0).
Continue Expression
93 ContinueExpression = 'continue'
A continue expression causes the next iteration of the innermost enclosing while, for, or foreach loop. When used in a while expression, control is passed to the while condition. When used in a for expression, control is passed to the step expression. The value of the continue expression is always the value zero (0). See Example 25.26.
If Expressions
94 IfExpression ::= 'if' '(' SimpleExpression ')' 'then' ExpressionList ( 'elseif' '(' SimpleExpression ')' 'then' ExpressionList )* ( 'else' ExpressionList )? 'endif'
An If Expressions is a conditional expression, which, depending upon the value of the SimpleExpression67 in the if-part, will either evaluate and return the value of the ExpressionList65 in its then-part or, if present, evaluate and return the value of the ExpressionList in its elseif-part or else-part. See Code blocks determine span of declarations on page 927.
Syntax
foreach variable in( argument list )do expression list endfor
Return
The value of the SimpleExpression67 in the if-part is promoted to a boolean value and a logical boolean operation is performed. If this boolean operation evaluates to true (1), the value of the ExpressionList65 in the then-part is returned. Otherwise, if there's an elseif-part present, and the value of the SimpleExpression in the elseif-part evaluates to true (1), then the value of its ExpressionList is returned.If there are several elseif-parts, the SimpleExpression of each elseif-part, is evaluated, in order, and if true(1), then the value of its corresponding ExpressionList is returned. Otherwise, the value of the ExpressionList in the else-part is returned; if there is no else-part, the value 0 is returned. In any circumstance, only one of the expression lists is ever evaluated.
For Expressions
95 'for' Assignment 'upto' Accessor ('step' SimpleExpression)? 'do' ExpressionList 'endfor' | 'for' Assignment 'downto' Accessor ('step' SimpleExpression)? 'do' ExpressionList 'endfor'
A For Expression is a conditionally iterative statement or loop. The for condition declares and defines a FormCalc variable as the value of the start expression. In the upto variant, the value of the loop variable will iterate from the start expression to the end expression in step expression increments. If you omit the step expression, the step increment defaults to 1. In the downto variant, the value of the loop variable iterates from the start expression to the end expression in step expression decrements. If the step expression is omitted, the step decrements defaults to -1. Iterations of the loop are controlled by the end expression value. Before each iteration, the end expression is evaluated and compared to the loop variable. If the value is true (1), the expression list is evaluated. After each evaluation, the step expression is evaluated and added to the loop variable. Before each iteration, the
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end expression is evaluated and compared to the loop variable. In addition, after each evaluation of the do condition, the step expression is evaluated and subtracted from the loop variable. A for loop terminates when the start expression has surpassed the end expression. This can be both in an upwards direction, if you use upto, or in a downward direction, if you use downto.
Example 25.27 Code fragment calculating X to the power Y using a for loop
The following example calculates of the mathematical value of a number raised to the power of another number.
var y = 1 for var x = 1 upto power do y = y * base endfor total=y
where power, base, and total are fields in the same subform as the script. The following example uses the step feature to calculate the sum of all even numbers between 1 and 100.
Example 25.28 Code fragment calculating sum of a series using a for loop
var x var evensum=0 for x=2 upto 100 step 2 do evensum=evensum+x endfor
A For Each expression iterates over the expression list for each value in its argument list. The in condition, which is executed only once (after the loop variable has been declared) controls the iteration of loop. Before each iteration, the loop variable is assigned successive values from the argument list. The argument list cannot be empty. Note: Use a comma (,) to separate more than one simple expression in the argurment list.
Return
The value of the last expression list that was evaluated, or zero(0), if the loop was never entered.
Example 25.29 Code fragment calculating sum of columns using a foreach loop
The following example calculates travelling expenses:
var total = 0.0 foreach expense in ( travel_exp[*], living_exp[*],parking_exp[*] ) do total = total + expense endfor
While Expression
97 WhileExpression ::= 'while' '(' SimpleExpression ')' 'do' ExpressionList 'endwhile'
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A While Expression is an iterative statement or loop that evaluates a given simple expression. If the result of the evaluation is true (1), FormCalc repeatedly examines the do condition and returns the results of the expression lists. If the result is false (0), then control passes to the next statement. A While Expression is particularly well suited to situations in which conditional repetition is needed. Conversely, situations in which unconditional repetition is needed is often best dealt with using a for expression.
Return
The result of the list of expressions associated with the do condition.
This all leads to the following rule regarding variables, and their scope:
A variable declared within block A is only valid within its scope in block A.
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If block B is nested within block A, then a variable valid in block A is also valid in block B except in a scope of block B where that variable has been redeclared.
Consider the following annotated FormCalculation as a valid, though contrived example of the concepts defined above.
Block Expression
98 BlockExpression ::= 'do' ExpressionList 'end'
The block expression defines the scope for an expression list. A scope specifies the lifetime of variables that it defines. For example, the following expression returns 3.
var xxx=3 do var xxx=1 end xxx
FormCalc supports a large set of built-in functions to do arithmetic, financial, logic, date, time, and string operations. It also allows you to define your own functions. Here's a summary of the key properties of built-in functions:
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Function names are case-insensitive. Built-in functions are predefined, but their names are not reserved words: this means that the built-in function Max() will never conflict with an object, object property, or object method named Max. Many of the built-in functions have a mandatory number of arguments which can be followed by a optional number of arguments. Some built-in functions, accept an indefinite number of arguments. Examples of such functions include: Avg(), Count(), Max(), Min(), Sum(), and Concat(). Built-in functions take precedence over user-defined functions. That is, if the user defines a function with the same name as a built-in function, the built-in function is executed.
Note: If you write a function that has the same name (ignoring case) as one of the built-in functions, your function is NOT invoked. Rather, the built-in function is invoked. FormCalc provides several undocumented built-in functions: acos, asin, atan, cos, deg2rad, exp, log, pi, pow, rad2deg, sin, sqrt, and tan.
Method Calls
103 MethodCall ::= Method '(' ( ArgumentList )? ')' 104 Method ::= Identifier 105 ArgumentList ::= SimpleExpression (',' SimpleExpression )*
FormCalc also provides access to object methods, not just objects and object properties. The syntax for Accessors90 permits this.Object methods are all described in LiveCycle Designer ES Scripting Reference [LC-Scripting-Reference]. Methods are application-defined operators that act upon objects and their properties; these operators are invoked like a function call, in that arguments may be passed to methods exactly like function calls. The number and type of arguments in each method are prescribed by each object type. Objects of different types will support different methods.
Case Sensitivity
The names of functions and methods are case insensitive, but are not reserved. This means that calculations on forms with objects whose names coincide with the names of functions do not conflict; any object method or function can be called equally.
Argument List
All functions and methods take an ArgumentList105, although that list may be empty. The number and type of arguments varies with each function. Some, such as Date() and Time() take no arguments. Others, such as Num2Date() take multiple arguments, the first argument being a number, with the remaining arguments being strings. Many functions accept a variable number of arguments. Leading arguments are mandatory, and trailing arguments are often optional. This maintains the complexity of most functions at a low level. Increased functionality is provided to those users who need it by requiring them to supply the additional arguments.
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All arguments in an ArgumentList105 are evaluated in order, leading arguments first. If the number of mandatory arguments passed to a function is less than the number required, the function generates an error exception. Many functions require numeric arguments. If any of the passed arguments are non-numeric, they are promoted to numbers. Some function arguments only require integral values; in such cases, the passed arguments are always promoted to integers by truncating the fractional part.
Select locale-specific date formats (DateFmt() and LocalDateFmt()) Parse strings into numbers according to locale-specific date formats (Date2Num()) Get the current date (Date()) Do basic arithmetic on dates Format numbers into strings, according to locale-specific date picture clauses (Num2Date()). Select locale-specific time formats (TimeFmt() and LocalTimeFmt()), Parse strings into numbers according, to locale-specific time picture clauses (Time2Num()), Get the current time (Time()) Do basic arithmetic on times Format numbers into strings according to locale-specific time formats (Num2Time()). Parse ISO-8601 date strings and time strings into numbers (IsoDate2Num() and IsoTime2Num()).
Prompt the user for dates and times, choosing from a set of conventional styles (date/time format style) and using symbols appropriate for the users locale to represent the chosen style (localized date/time format). For example, the conventional date styles include short, medium, long, and full. Further, the English-language short-style localized date format is MM/DD/YY. Provide the input parser with a picture clause to use for interpreting user-entered values. Picture clauses serve as a template for converting between user-entered data and canonical data. Provide an output formatter with a picture clause to use in formatting data for output. Provide the input parser with a locale identifier to us in the above parsing.
Locales
When developing internationalized applications, a locale is the standard term used to identify a particular nation (language and/or country). A locale defines (but is not limited to) the format of dates, times, numeric and currency punctuation that are culturally relevant to a specific nation. A properly internationalized application will always rely on the locale to supply it with the format of dates, and times. This way, users operating in their locale will always be presented with the date and time formats they are accustomed to. Localization and Canonicalization on page 139 in the chapter Exchanging Data Between an External Application and a Basic XFA Form provides additional information about localization.
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Properly internationalized applications then, will always query the locale for a date format. The form designer has the option of choosing from either the default, short, medium, long or full formats, and will never present to the user a hand-crafted date format. Except for the need of a common format for data interchange, use of hand-crafted date formats are best avoided.
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For a specification of how to construct date picture clauses, refer to Date Picture Clauses on page 1018 within the Picture Clause Specification.
Specifically, in the default en_US locale, the default date picture clause is the following:
MMM D, YYYY
Date picture clauses are used to format and parse date strings, using the built-in functions Num2Date() and Date2Num(). All formatting and parsing is strict; when formatting, all literals and punctuations are included, and when parsing, all literals and punctuations must be matched exactly. If the date picture clause is meaningless, no formatting nor parsing is attempted.
YY/MM/DD n/a
FormCalc provides several functions that return or process localized date formats. For example, LocalDateFmt() returns a localized date format that might be used to prompt a user to enter a date. The resulting localized date format uses the date symbols specific for the locale.
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In much the same way that date format styles are governed by an ISO standards body, so are time formats. Again, each nation gets to specify the form of its default, short, medium, long, and full time formats. The locale is responsible for identifying the format of times that conform to the standards of that nation. The default time format tends to coincide with the medium time format.
Just as with a date format styles, a time picture clause is a shorthand specification to format a time. It consists of punctuations, literals, and pattern symbols, e.g., "HH:MM:SS" is a time picture clause. For a specification of how to construct time picture clauses, refer to Time Pictures on page 1025 in the Picture Clause Specification.
Any time picture clause containing incorrectly specified picture clause symbols, e.g., HHH are invalid. When parsing, time picture clauses with multiple instances of the same pattern symbols, e.g., HH:MM:HH are invalid, as are time picture clauses with conflicting pattern symbols, e.g., h:HH:MM:SS. Time picture clauses with adjacent one letter pattern symbols, e.g., HMS, are inherently ambiguous and should be avoided.
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Syntax
Abs(n1)
Parameters
n1
Returns
The absolute value or null if its parameter is null.
returns 1.03.
Abs(-1.03)
returns 1.03.
Abs(0)
returns 0.
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Avg()
This function returns the average of the non-null elements of a given set of numbers.
Syntax
Avg(n1 [, n2...])
Parameters
n1
Returns
The average of its non-null parameters, or null if its parameter are all null.
Avg(Price[0], Price[1], 9 if Price[0] has a value of 8, Price[1] has value 10, and Price[2] Price[2], Price[3]) and Price[3] are null Avg(Quantity[*]) Avg(Quantity[*])
9 if Quantity has two occurrences with values of 8 and 10 null if all occurrences of Quantity are null
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Ceil()
This function returns the whole number greater than or equal to a given number.
Syntax
Ceil(n1)
Parameters
n1
Returns
The ceiling or null if its parameter is null.
returns 2.
Ceil(-1.9)
returns -1.
Ceil(A)
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Count()
This function returns the count of the non-null elements of a given set of numbers.
Syntax
Count(n1 [, n2...])
Parameters
n1
Returns
The count.
returns 3.
Count(Quantity[*])
returns the number of occurrences of Quantity that are non-null, and returns 0 if all of occurrences of Quantity are null.
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Floor()
This function returns the largest whole number that is less than or equal to a given value.
Syntax
Floor(n1)
Parameters
n1
Returns
The floor or null if its parameter is null.
returns 6.
Floor(7.0)
returns 7.
Floor(Price)
XFA Specification Chapter 25, FormCalc Specification Arithmetic Built-in Functions 938
Max()
This function returns the maximum value of the non-null elements of a given set of numbers.
Syntax
Max(n1 [, n2...])
Parameters
n1
Returns
The maximum of its non-null parameters, or null if all its parameters are null.
Returns The maximum value of all occurrences of the object Price or 100, whichever is greater
null
XFA Specification Chapter 25, FormCalc Specification Arithmetic Built-in Functions 939
Min()
This function returns the minimum value of the non-null elements of a given set of numbers.
Syntax
Min(n1 [, n2...])
Parameters
n1
Returns
The minimum of its non-null parameters, or null if all its parameters are null.
Returns -4 The minimum value of all occurrences of the object Price or 100, whichever is less null
Min(null)
XFA Specification Chapter 25, FormCalc Specification Arithmetic Built-in Functions 940
Mod()
This function returns the modulus of one number divided by another.
Syntax
Mod(n1, n2)
Parameters
n1
Returns
The modulus or null if any of its parameter are null. The modulus is the remainder of the implied division of the dividend and the divisor. The sign of the remainder always equals the sign of the dividend. For integral operands, this is simple enough. For floating point operands, the floating point remainder r of Mod(n1, n2) is defined as r = n1 - (n2 * q) where q is an integer whose sign is negative when n1 / n2 is negative, and positive when n1 / n2 is positive, and whose magnitude is the largest integer less than the quotient n1 / n2. If the divisor is zero, the function generates an error exception.
Returns 0. -1 1 -0.4
XFA Specification Chapter 25, FormCalc Specification Arithmetic Built-in Functions 941
Round()
This function returns a number rounded to a given number of decimal places.
Syntax
Round(n1 [, n2])
Parameters
n1
is the number of decimal places. If n2 is omitted, 0 is used as the default. If n2 is greater than 12, 12 is used as the maximal precision.
Returns
The rounded value or null if any of its parameters are null.
Yields 33.235 6.67 -1 2.33 if the value of the object Price is 2.3333
XFA Specification Chapter 25, FormCalc Specification Arithmetic Built-in Functions 942
Sum()
This function returns the sum of the non-null elements of a given set of numbers.
Syntax
Sum(n1 [, n2...])
Parameters
n1
Returns
The sum of its non-null parameters, or null if all of its parameters are null.
Returns 10 The sum of all occurrences of the object Amount The sum of two occurrences of the object Amount
XFA Specification Chapter 25, FormCalc Specification Date And Time Built-in Functions 943
Syntax
Date()
Returns
The number of days for the current date.
XFA Specification Chapter 25, FormCalc Specification Date And Time Built-in Functions 944
Date2Num()
This function returns the number of days since the epoch, given a date string.
Syntax
Date2Num(d1[, f1[, k1]])
Parameters
d1
is a date string in the format given by f1, governed by the locale given by k1.
f1
is a locale identifier string, as described in Specifying a Locale (Locale Identifier String) on page 930. If k1 is omitted, the prevailing locale is used.
Returns
The days since the epoch or null if any of its parameters are null. If the given date is not in the format given, or the picture clause is invalid, or the locale is invalid, the function returns 0. Sufficient information must be provided to determine a unique day since the epoch: if any of the day of the year and year of the era are missing, or any of the day of the month, month of the year and year of the era are missing, the function returns 0.
Returns 35138 1
35138
See Also
Num2Date() and DateFmt()
XFA Specification Chapter 25, FormCalc Specification Date And Time Built-in Functions 945
DateFmt()
This function returns a date picture clause, given a date format style.
Syntax
DateFmt([n1[, k1]]])
Parameters
n1
An integer identifying the date format style, whose value has the following meaning: Value supplied in first argument 0 (default) 1 2 3 4
k1
Requests the locale-specific style Default style Short style Medium style Long style Full style
is a locale identifier string, as described in Specifying a Locale (Locale Identifier String) on page 930. If k1 is omitted, the prevailing locale is used.
Returns
The date picture clause or null if any of its mandatory parameters are null. If the given date format style is invalid, the function returns default-style date picture clause.
See Also
Num2Date(), Date2Num(), and LocalDateFmt()
XFA Specification Chapter 25, FormCalc Specification Date And Time Built-in Functions 946
IsoDate2Num()
This function returns the number of days since the epoch, given an [ISO-8601] date string.
Syntax
IsoDate2Num(d1)
Parameters
d1
is a canonical date string in one of the following two formats: YYYY[MM[DD]] YYYY[-MM[-DD]] or, is an ISO-8601 date-time string the concatenation of an ISO-8601 date string with an ISO-8601 time string, separated by the character T, as in: 1997-07-16T20:20:20
Returns
The days from the epoch or null if its parameter is null. If the given date is not in one of the accepted formats, the function returns 0.
Returns 1 1 1 35138 29
See Also
IsoTime2Num() and Num2Date()
XFA Specification Chapter 25, FormCalc Specification Date And Time Built-in Functions 947
IsoTime2Num()
This function returns the number of milliseconds since the epoch, given an [ISO-8601] time string.
Syntax
IsoTime2Num(d1)
Parameters
d1
or, is an ISO-8601 date-time string the concatenation of an ISO-8601 date string with an ISO-8601 time string, separated by the character T, as in: 1997-07-16T20:20:20
Returns
The number of milliseconds from the epoch or null if its parameter is null. If the time string does not include a timezone, the current timezone is used. If the given time is not in a valid format, the function returns 0.
See Also
IsoDate2Num() and Num2Time()
XFA Specification Chapter 25, FormCalc Specification Date And Time Built-in Functions 948
LocalDateFmt()
This function returns a string containing a localized date format, given a date format style.
Syntax
LocalDateFmt([n1[, k1]])
Parameters
n1
is an integer identifying the date format style. The following table describes the possible values for n1. n1 0 1 2 3 4
k1
Style requested for the localized date format Locale-specific default style Locale-specific short style Locale-specific medium style Locale-specific long style Locale-specific full style
is a locale identifier string, as described in Specifying a Locale (Locale Identifier String) on page 930. If k1 is omitted, the prevailing locale is used.
Returns
The localized date format or null if any of its parameters are null. If the given format style is invalid, the function returns default-style localized date format. The date picture clauses returned by this function are not usable in the functions Date2Num() and Num2Date().
See Also
DateFmt()
XFA Specification Chapter 25, FormCalc Specification Date And Time Built-in Functions 949
LocalTimeFmt()
This function returns a localized time format, given a time format style.
Syntax
LocalTimeFmt([n1[, k1]])
Parameters
n1
is an integer identifying the time format style as follows: n1 0 1 2 3 4 Style requested for the localized time format Locale-specific default style Locale-specific short style Locale-specific medium style Locale-specific long style Locale-specific full style
is a locale identifier string, as described in Specifying a Locale (Locale Identifier String) on page 930. If k1 is omitted, the prevailing locale is used.
Returns
The localized time format or null if any of its parameters are null. If the given format style is invalid, the function returns default-style localized time format. The time picture clauses returned by this function are not usable in the functions Time2Num() and Num2Time().
See Also
TimeFmt()
XFA Specification Chapter 25, FormCalc Specification Date And Time Built-in Functions 950
Num2Date()
This function returns a date string, given a number of days since the epoch.
Syntax
Num2Date(n1 [,f1 [, k1]])
Parameters
n1
is a locale identifier string, as described in Specifying a Locale (Locale Identifier String) on page 930. If k1 is omitted, the prevailing locale is used.
Returns
The date string or null if any of its parameters are null. The formatted date is in the format given in f1, governed by the locale given in k1. If the given date is invalid, the function returns an empty string.
returns "01/01/1900".
Num2Date(35139, "DD-MMM-YYYY", "de_CH")
returns "16-Mrz-1996".
Num2Date( Date2Num("31-ago-98", "DD-MMM-YY", "es_ES") - 31, "D' de 'MMMM' de 'YYYY", "pt_BR")
See Also
Date2Num(), DateFmt() and Date()
XFA Specification Chapter 25, FormCalc Specification Date And Time Built-in Functions 951
Num2GMTime()
This function returns a GMT time string, given a number of milliseconds from the epoch.
Syntax
Num2GMTime(n1 [,f1 [, k1]])
Parameters
n1
is a time picture clause, as defined above. If f1 is omitted, the default time picture clause is used.
k1
is a locale identifier string, as described in Specifying a Locale (Locale Identifier String) on page 930. If k1 is omitted, the prevailing locale is used.
Returns
The GMT time string or null if any of its parameters are null. The formatted time is in the format given in f1, governed by the locale given in k1. The locale is used to format any timezone names. If the given time is invalid, the function returns an empty string.
returns "00:00:00".
Num2GMTime(65593001, "HH:MM:SS Z")
See Also
Num2Time()
XFA Specification Chapter 25, FormCalc Specification Date And Time Built-in Functions 952
Num2Time()
This function returns a time string, given a number of milliseconds from the epoch.
Syntax
Num2Time(n1 [,f1 [, k1]])
Parameters
n1
is a time picture clause, as defined above. If f1 is omitted, the default time picture clause is used.
k1
is a locale identifier string, as described in Specifying a Locale (Locale Identifier String) on page 930. If k1 is omitted, the prevailing locale is used.
Returns
The time string or null if any of its parameters are null. The formatted time is in the format given in f1, governed by the locale given in k1. The locale is used to format any timezone names. If the given time is invalid, the function returns an empty string.
Returns "00:00:00" in Greenwich, England and "09:00:00" in Tokyo "13:13:13 EST" in Boston "13:13:13 GMT-05:00" to a German Swiss user in Boston "13.13 Uhr GMT+01:00" to a user in Zurich "13:13+01:00" to that same user in Zurich
Num2Time(65593001, "HH:MM:SS Z") Num2Time(65593001, "HH:MM:SS Z", "de_CH") Num2Time(43993001, TimeFmt(4, "de_CH"), "de_CH") Num2Time(43993001, "HH:MM:SSzz")
See Also
Date2Num(), DateFmt() and Date()
XFA Specification Chapter 25, FormCalc Specification Date And Time Built-in Functions 953
Time()
This function returns the current system time as the number of milliseconds since the epoch.
Syntax
Time()
Returns
The number of milliseconds for the current time.
XFA Specification Chapter 25, FormCalc Specification Date And Time Built-in Functions 954
Time2Num()
This function returns the number of milliseconds since the epoch, given a time string.
Syntax
Time2Num(d1[, f1[, k1]])
Parameters
d1
is a time string in the format given by f1, governed by the locale given by k1.
f1
is a time picture clause, as defined above. If f1 is omitted, the default time picture clause is used.
k1
is a locale identifier string, as described in Specifying a Locale (Locale Identifier String) on page 930. If k1 is omitted, the prevailing locale is used.
Returns
The milliseconds from the epoch or null if any of its parameters are null. If the time string does not include a timezone, the current timezone is used. The locale is used to parse any timezone names. If the given time is not in the format given, or the format is invalid, or the locale is invalid, the function returns 0. Sufficient information must be provided to determine a second since the epoch: if any of the hour of the meridiem, minute of the hour, second of the minute, and meridiem are missing, or any of the hour of the day, minute of the hour, and second of the minute are missing, the function returns 0.
returns 1.
Time2Num("1:13:13 PM")
returns 76393001 to a user in California on Standard Time, and 76033001 when that same user is on Daylight Savings Time.
(Time2Num("13:13:13", "HH:MM:SS") - Time2Num("13:13:13 GMT", "HH:MM:SS Z")) / (60 * 60 * 1000)
returns 8 to a user in Vancouver and returns 5 to a user in Ottawa when on Standard Time. On Daylight Savings Time, the returned values are returns 7 and 4, respectively.
Time2Num("1.13.13 dC GMT+01:00", "h.MM.SS A Z", "it_IT")
returns 43993001.
XFA Specification Chapter 25, FormCalc Specification Date And Time Built-in Functions 955
See Also
Num2Time(), andTimeFmt().
XFA Specification Chapter 25, FormCalc Specification Date And Time Built-in Functions 956
TimeFmt()
This function returns a time format given a time format style.
Syntax
TimeFmt([n1[, k1]]])
Parameters
n1
is an integer identifying the time format style, whose value has the following meaning: n1 0 1 2 3 4 Style requested for the localized time format Locale-specific default style Locale-specific short style Locale-specific medium style Locale-specific long style Locale-specific full style
is a locale identifier string, as described in Specifying a Locale (Locale Identifier String) on page 930. If k1 is omitted, the prevailing locale is used.
Returns
The time format or null if any of its parameters are null. If the given format style is invalid, the function returns default-style time format.
See Also
Time().
XFA Specification Chapter 25, FormCalc Specification Financial Built-in Functions 957
Apr()
This function returns the annual percentage rate for a loan.
Syntax
Apr(n1, n2, n3)
Parameters
n1
Returns
The annual percentage rate or null if any of its parameters are null. If any of n1, n2, or n3 are non-positive, the function generates an error exception.
returns 0.085* (8.5%) which is the annual interest rate on a loan of $35,000 being repaid at $269.50 per month over 30 years.
XFA Specification Chapter 25, FormCalc Specification Financial Built-in Functions 958
CTerm()
This function returns the number of periods needed for an investment earning a fixed, but compounded, interest rate to grow to a future value.
Syntax
CTerm(n1, n2, n3)
Parameters
n1
Returns
The number of periods or null if any of its parameters are null. If any of n1, n2, or n3 are non-positive, the function generates an error exception.
returns 35.00*, which is the required period for $100 invested at 2% to grow to $200.
XFA Specification Chapter 25, FormCalc Specification Financial Built-in Functions 959
FV()
This function returns the future value of periodic constant payments at a constant interest rate.
Syntax
FV(n1, n2, n3)
Parameters
n1
Returns
The future value or null if any of its parameters are null. If n1 or n3 are non-positive, or if n2 is negative, the function generates an error exception. If n2 is 0, the function returns the product of n1 and n3, i.e., the payment amount multiplied by the number of payments.
returns 17793.03*, which is the amount present after paying $100 a month for 10 years in an account bearing an annual interest of 7.5%.
FV(1000, 0.01, 12)
returns 12682.50*.
XFA Specification Chapter 25, FormCalc Specification Financial Built-in Functions 960
IPmt()
This function returns the amount of interest paid on a loan over a period of time.
Syntax
IPmt(n1, n2, n3, n4, n5)
Parameters
n1
Returns
The interest amount or null if any of its parameters are null. If any of n1, n2, or n3 are non-positive, the function generates an error exception. If n4 or n5 are negative, the function generates an error exception. If the payment is less than the monthly interest load, the function returns 0.
returns 624.88* which is the amount of interest paid starting in July (month 7) for 3 months on a loan of $30,000.00 at an annual interest rate of 8.5% being repaid at a rate of $295.50 per month.
XFA Specification Chapter 25, FormCalc Specification Financial Built-in Functions 961
NPV()
This function returns the net present value of an investment based on a discount rate, and a series of periodic future cash flows.
Syntax
NPV(n1, n2 [, ...])
Parameters
n1
are the cash flow values which must be equally spaced in time and occur at the end of each period.
Returns
The net present value rate or null if any of its parameters are null. The function uses the order of the values n2, ... to interpret the order of the cash flows. Ensure payments and incomes are specified in the correct sequence. If n1 is non-positive, the function generates an error exception.
returns 368075.16* which is the net present value of an investment projected to generate $100,000, $120,000, $130,000, $140,000 and $50,000 over each of the next five years and the rate is 15% per annum.
NPV(0.10, -10000, 3000, 4200, 6800)
returns 1188.44*.
NPV(0.08, 8000, 9200, 10000, 12000, 14500)
returns 41922.06*.
XFA Specification Chapter 25, FormCalc Specification Financial Built-in Functions 962
Pmt()
This function returns the payment for a loan based on constant payments and a constant interest rate.
Syntax
Pmt(n1, n2, n3)
Parameters
n1
Returns
The loan payment or null if any of its parameters are null. If any of n1, n2, or n3 are non-positive, the function generates an error exception.
returns 333.01*, which is the monthly payment for a loan of a $30,000, borrowed at a yearly interest rate of 8.5%, repayable over 12 years (144 months).
Pmt(10000, .08 / 12, 10)
returns 1037.03*, which is the monthly payment for a loan of a $10,000 loan, borrowed at a yearly interest rate of 8.0%, repayable over 10 months.
XFA Specification Chapter 25, FormCalc Specification Financial Built-in Functions 963
PPmt()
This function returns the amount of principal paid on a loan over a period of time.
Syntax
PPmt(n1, n2, n3, n4, n5)
Parameters
n1
Returns
The principal paid or null if any of its parameters are null. If any of n1 , n2 , or n3 are non-positive, the function generates an error exception. If n4 or n5 are negative, the function generates an error exception. If payment is less than the monthly interest load, the function generates an error exception.
returns 261.62*, which is the amount of principal paid starting in July (month 7) for 3 months on a loan of $30,000 at an annual interest rate of 8.5%, being repaid at $295.50 per month. The annual interest rate is used in the function because of the need to calculate a range within the entire year.
XFA Specification Chapter 25, FormCalc Specification Financial Built-in Functions 964
PV()
This function returns the present value of an investment of periodic constant payments at a constant interest rate.
Syntax
PV(n1, n2, n3)
Parameters
n1
Returns
The present value or null if any of its parameters are null. If any of n1 and n3 are non-positive, the function generates an error exception.
returns 49318.43* which is the present value of $1000.00 invested at 8%per annum for 5 years.
PV(500, .08 / 12, 20 * 12)
returns 59777.15*.
XFA Specification Chapter 25, FormCalc Specification Financial Built-in Functions 965
Rate()
This function returns the compound interest rate per period required for an investment to grow from present to future value in a given period.
Syntax
Rate(n1, n2, n3)
Parameters
n1
Returns
The compound rate or null if any of its parameters are null. If any of n1, n2 , or n3 are non-positive, the function generates an error exception.
returns 0.10 which is what the rate of interest must be for and investment of $100 to grow to $110 if invested for 1 term.
XFA Specification Chapter 25, FormCalc Specification Financial Built-in Functions 966
Term()
This function returns the number of periods needed to reach a given future value from periodic constant payments into an interest bearing account.
Syntax
Term(n1, n2, n3)
Parameters
n1
Returns
The number of periods or null if any of its parameters are null. If any of n1, n2, or n3 are non-positive, the function generates an error exception.
returns 3.00* which is the number of periods for an investment of $475, deposited at the end of each period into an account bearing 5% compound interest, to grow to $1500.00.
XFA Specification Chapter 25, FormCalc Specification Logical Built-in Functions 967
Choose()
This function selects a value from a given set of parameters.
Syntax
Choose(n1, s1 [, s2...])
Parameters
n1
Returns
The selected argument or null if its first parameter is null. If n1 is less than 1 or greater than the number of arguments in the set, the function returns an empty string.
returns "Personnel".
Choose(Quantity, "A", "B", "C")
XFA Specification Chapter 25, FormCalc Specification Logical Built-in Functions 968
Exists()
Determines if the given parameter is an accessor to an existing object.
Syntax
Exists(v1)
Parameters
v1
is the accessor.
Returns
True (1) if the given parameter is an accessor to (a property of ) an object that exists, and false (0), if it does not. If the given parameter is not an accessor, the function returns false (0).
returns true (1) if the object Item exists, false (0) otherwise.
Exists("hello world")
returns true (1) if the object Invoice exists and has a Border property, which in turn, has at least one Edge property, which in turn, has a Color property. Otherwise, it returns false (0).
XFA Specification Chapter 25, FormCalc Specification Logical Built-in Functions 969
HasValue()
Determines if the given parameter is an accessor with a non-null, non-empty, non-blank value.
Syntax
HasValue(v1)
Parameters
v1
is the accessor.
Returns
True (1) if the given parameter is an accessor with a non-null, non-empty, non-blank value. A non-blank value will contain characters other than white spaces. If the given parameter is not an accessor, the function returns true (1), if its a non-null, non-empty, non-blank value.
returns true (1), if the object Item exists, and has a non-null, non-empty, non-blank value. Otherwise, it returns false (0).
HasValue(" ")
XFA Specification Chapter 25, FormCalc Specification Logical Built-in Functions 970
Oneof()
This logical function returns true if a value is in a given set.
Syntax
Oneof(s1, s2 [, s3...])
Parameters
s1
Returns
True (1) if the first parameter is in the set, false (0) if it is not in the set.
returns true (1) if the current object has a value of 4, 13 or 24; otherwise it returns false (0).
Oneof(Item, null, "A", "B", "C")
returns true (1) if the value in the object Item is null, "A", "B" or "C"; otherwise it returns false (0).
XFA Specification Chapter 25, FormCalc Specification Logical Built-in Functions 971
Within()
This logical function returns true if a value is within a given range.
Syntax
Within(s1, s2, s3)
Parameters
s1
Returns
True (1) if the first parameter is within range, false (0) if it is not in range, or null if the first parameter is null. If the first value is numeric then the ordering comparison is numeric. If the first value is non-numeric then the ordering comparison uses the collating sequence for the current locale.
returns true (1) if the value of the current object is between 1 and 10.
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 972
Many of these functions require a numeric position argument. All strings are indexed starting at character position one; i.e., character position 1 is the first character of the array. The last character position coincides with the length of the string. Any character position less than one refers to the first character string, and any character position greater than the length of the string refers to the last character of the string.
At()
This function locates the starting character position of string s2 within string s1.
Syntax
At(s1, s2)
Parameters
s1
Returns
The character position of the start of s2 within s1 or null if any of its parameters are null. If string s2 is not in s1, the function returns 0. If string s2 is empty, the function returns 1.
returns 1.
At("ABCDE", "DE")
returns 4.
At("WXYZ", "YZ")
returns 3.
At("123999456", "999")
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 973
returns 4.
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 974
Concat()
This function returns the string concatenation of a given set of strings.
Syntax
Concat(s1 [, s2...])
Parameters
s1
Returns
The concatenated string or null if all of its parameters are null.
returns "ABCCDE".
Concat("XX", Item, "-01")
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 975
Decode()
This function returns the decoded version of a given string.
Syntax
Decode(s1 [, s2])
Parameters
s1
is a string identifying the type of decoding to perform: - if the value is "url", the string will be URL decoded. - if the value is "html", the string will be HTML decoded. - if the value is "xml", the string will be XML decoded. If s2 is omitted, the string will be URL decoded.
Returns
The decoded string.
returns "".
Decode("~!@#$%^&*()_+|`{"}[]<>?,./;':", "xml")
returns "~!@#$%^&*()_+|`{""}[]<>?,./;':".
See Also
Encode().
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 976
Encode()
This function returns the encoded version of a given string.
Syntax
Encode(s1 [, s2])
Parameters
s1
is a string identifying the type of encoding to perform: - if the value is "url", the string will be URL encoded. - if the value is "html", the string will be HTML encoded. - if the value is "xml", the string will be XML encoded. If s2 is omitted, the string will be URL encoded.
Returns
The encoded string.
returns "%22hello,%20world!%22".
Encode("", "html")
See Also
Decode().
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 977
Format()
This function formats the given data according to the given picture clause.
Syntax
Format(s1, s2[, s3...])
Parameters
s1
is the picture clause, which may be a locale-sensitive picture clause. See Picture Clause Specification on page 1002..
s2
is any additional source data being formatted. For date picture clauses, the source data must be an ISO date string in one of two formats: YYYY[MM[DD]] YYYY[-MM[-DD]] or, be an ISO date-time string. For time picture clauses, the source data must be an ISO time string in one of the following formats:
HH[MM[SS[.FFF][z]]] HH[MM[SS[.FFF][+HH[MM]]]] HH[MM[SS[.FFF][-HH[MM]]]] HH[:MM[:SS[.FFF][z]]] HH[:MM[:SS[.FFF][-HH[:MM]]]] HH[:MM[:SS[.FFF][+HH[:MM]]]]
or, be an ISO date-time string. For date-time picture clauses, the source data must be an ISO date-time string. For numeric picture clauses, the source data must be numeric. For text picture clauses, the source data must be textual. For compound picture clauses, the number of source data arguments must match the number of sub elements in the picture.
Returns
The formatted data as a string, or an empty string if unable to format the data.
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 978
See Also
IsoDate2Num(), IsoTime2Num(), and Parse().
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 979
Left()
This function extracts a number of characters from a given string, starting with the first character on the left.
Syntax
Left(s1, n1)
Parameters
s1
Returns
The extracted string or null if any of its parameters are null. If the number of characters to extract is greater than the length of the string, the function returns the whole string. If the number of characters to extract is 0 or less, the function returns the empty string.
returns "AB".
Left("ABCD", 10)
returns "ABCD".
Left("XYZ-3031", 3)
returns "XYZ".
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 980
Len()
This function returns the number of characters in a given string.
Syntax
Len(s1)
Parameters
s1
Returns
The length or null if its parameter is null.
returns 3.
Len("ABCDEFG")
returns 7.
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 981
Lower()
This function returns a string where all given uppercase characters are converted to lowercase.
Syntax
Lower(s1[, k1])
Parameters
s1
is a locale identifier string, as described in Specifying a Locale (Locale Identifier String) on page 930. If k1 is omitted, the prevailing locale is used.
Returns
The lowercased string or null if any of its mandatory parameters are null. In some locales, there are alphabetic characters that do not have an lowercase equivalent.
Bugs
The current Acrobat implementation limits the operation of this function to ASCII, Latin1, and full-width subranges of the Unicode 2.1 character set. Characters outside these subranges are never converted.
returns "abc123x".
Lower("BD")
returns "bd".
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 982
Ltrim()
This function returns a string with all leading white space characters removed.
Syntax
Ltrim(s1)
Parameters
s1
Returns
The trimmed string or null if its parameter is null. White space characters includes the ASCII space, horizontal tab, line feed, vertical tab, form feed and carriage return, as well as, the Unicode space characters (Unicode category Zs).
returns "ABC".
Ltrim(" XY ABC")
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 983
Parse()
This function parses the given data according to the given picture clause.
Syntax
Parse(s1, s2)
Parameters
s1
Returns
The parsed data as a string, or the empty string if unable to parse the data. The data is formatted in canonical format, as described in the chapter Canonical Format Reference on page 898. A successfully parsed date is returned as an ISO date string of the form YYYY-MM-DD. A successfully parsed time is returned as an ISO time string of the form: HH:MM:SS. A successfully parsed date-time is returned as an ISO date-time string of the form: YYYY-MM-DDTHH:MM:SS. A successfully parsed numeric picture clause is returned as a number. A successfully parsed text pictures is format returned as text.
returns 2002-09-01.
Parse("$Z,ZZZ,ZZ9.99", "$1,234,567.89")
See Also
Format().
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 984
Replace()
This function replaces all occurrences of one string with another within a given string.
Syntax
Replace(s1, s2[, s3])
Parameters
s1
Returns
The replaced string or null if any of its mandatory parameters are null.
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 985
Right()
This function extracts a number of characters from a given string, beginning with the last character on the right.
Syntax
Right(s1, n1)
Parameters
s1
Returns
The extracted string or null if any of its parameters are null. If the number of characters to extract is greater than the length of the string, the function returns the whole string. If the number of characters to extract is 0 or less, the function returns the empty string.
returns "BC".
Right("ABC", 10)
returns "ABC".
Right("XYZ-3031", 4)
returns "3031".
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 986
Rtrim()
This function returns a string with all trailing white space characters removed.
Syntax
Rtrim(s1)
Parameters
s1
Returns
The trimmed string or null if any of its parameters are null. White space characters includes the ASCII space, horizontal tab, line feed, vertical tab, form feed, and carriage return, as well as, the Unicode space characters (Unicode category Zs).
returns "ABC".
Rtrim("XYZ ABC ")
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 987
Space()
This function returns a string consisting of a given number of blank spaces.
Syntax
Space(n1)
Parameters
n1
Returns
The blank string or null if its parameter is null.
returns "Gerry Pearl" when the value of the object FIRST is "Gerry", and the value of the object LAST is "Pearl".
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 988
Str()
This function converts a number to a character string.
Syntax
Str(n1 [, n2 [, n3]])
Parameters
n1
is the maximal width of the string; if omitted, a value of 10 is used as the default width.
n3
is the precision the number of digits to appear after the decimal point; if omitted, or negative, 0 is used as the default precision.
Returns
The formatted number or null if any of its mandatory parameters are null. The number is formatted to the specified width and rounded to the specified precision; the number may have been zero-padded on the left of the decimal to the specified precision. The decimal radix character used is the dot (.) character; it is always independent of the prevailing locale . If the resulting string is longer than the maximal width of the string, as defined by n2, then the function returns a string of '*' (asterisk) characters of the specified width.
returns "
2".
Str(4.532, 6, 4)
returns "4.5320".
Str(31.2345, 4, 2)
returns "****".
See Also
Format().
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 989
Stuff()
This function inserts a string into another string.
Syntax
Stuff(s1, n1, n2[, s2])
Parameters
s1
is the character position in string s1 to start stuffing. If n1 is less than one, the first character position is assumed. If n1 is greater than then length of s1, the last character position is assumed
n2
is the number of characters to delete from string s1, starting at character position n1. If n2 is less than or equal to 0, 0 characters are assumed.
s2
is the string to insert into s1. If s2 is omitted or null, the empty string is used.
Returns
The stuffed string or null if any of its mandatory parameters are null.
returns "ABXYZE".
Stuff("abcde", 4, 1, "wxyz")
returns "abcwxyze".
Stuff("ABCDE", 2, 0, "XYZ")
returns "AXYZBCDE".
Stuff("ABCDE", 2, 3)
returns "AE".
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 990
Substr()
This function extracts a portion of a given string.
Syntax
Substr(s1, n1, n2)
Parameters
s1
is the character position in string s1 to start extracting. If n1 is less than one, the first character position is assumed. If n1 is greater than then length of s1, the last character position is assumed
n2
is the number of characters to extract. If n2 is less than or equal to 0, 0 characters are assumed.
Returns
The sub string or null if any of its parameters are null. If n1 + n2 is greater than the length of s1 then the function returns the sub string starting a position n1 to the end of s1 .
returns "CDEF".
Substr("abcdefghi", 5, 3)
returns "efg".
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 991
Uuid()
This function returns a Universally Unique Identifier (UUID) string which is guaranteed (or at least extremely likely) to be different from all other UUIDs generated until the year 3400 A.D.
Syntax
Uuid([n1])
Parameters
n1
identifies the format of UUID string requested: - if the value is 0, the returned UUID string will only contain hex octets. - if the value is 1, the returned UUID string will contain dash characters separating the sequences of hex octets, at fixed positions. If n1 is omitted, the default value of 0 will be used.
Returns
The string representation of a UUID, which is an optionally dash-separated sequence of 16 hex octets.
Bugs
When used in in the XML Forms Plugin environment, the current implementation of this function does not return anything useful.
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 992
Upper()
This function returns a string with all given lowercase characters converted to uppercase.
Syntax
Upper(s1[, k1])
Parameters
s1
is a locale identifier string, as described in Specifying a Locale (Locale Identifier String) on page 930. If k1 is omitted, the prevailing locale is used.
Returns
The uppercased string or null if any of its mandatory parameters are null. In some locales, there are alphabetic characters that do not have a lowercase equivalent.
Bugs
The current Acrobat implementation limits the operation of this function to the ASCII, Latin1, and full-width subranges of the Unicode 2.1 character set. Characters outside these subranges are never converted.
returns "ABC".
Upper("bCd")
returns "BCD".
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 993
WordNum()
This function returns the English text equivalent of a given number.
Syntax
WordNum(n1 [, n2 [, k1]])
Parameters
n1
identifies the format option as one of the following: - if the value is 0, the number is converted into text representing the simple number. - if the value is 1, the number is converted into text representing the monetary value with no fractional digits. - if the value is 2, the number is converted into text representing the monetary value with fractional digits. If n2 is omitted, the default value of 0 will be used.
k1
is a locale identifier string, as described in Specifying a Locale (Locale Identifier String) on page 930. If k1 is omitted, the default en_US locale is used. Note: This argument is currently ignored in Acrobat. WordNum() can be used only in English-speaking locales.
Returns
The English text, or null if any of its parameters are null. If n1 is not numeric or the integral value of n1 is negative or greater than 922,337,203,685,477,550 the function returns "*" (asterisk) characters to indicate an error condition.
Bugs
By specifying a locale identifier other than the default, it should be possible to have this function return something other than English text. However the language rules used to implement this function are inherently English. Thus, for now, the locale identifier is ignored.
XFA Specification Chapter 25, FormCalc Specification String Built-in Functions 994
XFA Specification Chapter 25, FormCalc Specification URL Built-in Functions 995
download data from a URL, upload data to a URL, and post data to a URL
These functions are only operational when a protocol host has been provided to the FormCalc engine. The list of supported URL protocols (http, https, ftp, file) may thus vary with each protocol hosting environment.
Get()
This function downloads the contents of the given URL.
Syntax
Get(s1)
Parameters
s1
Returns
The downloaded data as a string, or an error exception if unable to download the URL's contents.
returns the Namespaces in XML standard from the World Wide Web Consortium.
Get("ftp://ftp.gnu.org/gnu/GPL")
See Also
Post() and Put()
XFA Specification Chapter 25, FormCalc Specification URL Built-in Functions 996
Post()
This function posts the given data to the given URL.
Syntax
Post(s1, s2[, s3[, s4[, s5]]])
Parameters
s1
is an optional string containing the name of the content type of the data being posted. Valid content types include:
text/html text/xml text/plain multipart/form-data application/x-www-form-urlencoded application/octet-stream any valid MIME type
If s3 is omitted, the content type defaults to "application/octet-stream". Note that the application is responsible for ensuring that the posted data is formatted according to the given content type.
s4
is an optional string containing the name of the code page that was used to encode the data being posted. Valid code page names include:
UTF-8 UTF-16 ISO8859-1 Any recognized [IANA] character encoding
If s4 is omitted, the code page defaults to "UTF-8". Note that the application is responsible for ensuring that the posted data is encoded according to the given code page.
s5
is an optional string containing any additional HTTP headers to be included in the post. If s5 is omitted, no additional HTTP header is included in the post. Note that when posting to SOAP servers, a "SOAPAction" header is usually required.
XFA Specification Chapter 25, FormCalc Specification URL Built-in Functions 997
Returns
The post response as a string, or an error exception if unable to post the data. The response string will be decoded according to the response's content type. For example, if the server indicates the response is UTF-8 encoded, then this function will UTF-8 decode the response data before returning to the application.
posts some urlencoded login data to a server and returns that server's acknowledgement page.
Req = "<?xml version='1.0' encoding='UTF-8'?>" Req = concat(Req, "<soap:Envelope>") Req = concat(Req, " <soap:Body>") Req = concat(Req, " <getLocalTime/>") Req = concat(Req, " </soap:Body>") Req = concat(Req, "</soap:Envelope>") Head = "SOAPAction: ""http://www.Nanonull.com/TimeService/getLocalTime""" Url = "http://www.nanonull.com/TimeService/TimeService.asmx/getLocalTime" Resp = post(Url, Req, "text/xml", "utf-8", Head)
posts a SOAP request for the local time to some server, expecting an XML response back.
See Also
Get() and Put()
XFA Specification Chapter 25, FormCalc Specification URL Built-in Functions 998
Put()
This function uploads the given data into the given URL.
Syntax
Put(s1, s2[, s3])
Parameters
s1
is an optional string containing the name of the code page that is to be used to encode the data before uploading it. Valid code page names include: - UTF-8, - UTF-16, - ISO8859-1, or - any recognized [IANA] character encoding. If s3 is omitted, the code page defaults to "UTF-8".
Returns
The empty string, or an error exception if unable to upload the data.
returns nothing if the ftp server permits the user to upload some xml data to the file pub/fubu.xml.
Get() and Post()
XFA Specification Chapter 25, FormCalc Specification Miscellaneous Built-in Functions 999
Syntax
Ref(v1)
Parameters
v1
Returns
A reference (or "handle") to an existing object if the given parameter is an accessor referring to an existing object, or an existing reference, or a method that returns an object, or, a function that evaluates to an object. If the given parameter is null, the function returns the null reference. For all other given parameters, the function returns the value given.
returns "hello".
See Also
Exists()
XFA Specification Chapter 25, FormCalc Specification Miscellaneous Built-in Functions 1000
UnitValue()
Returns the value of a unitspan after an optional unit conversion. A unitspan string consist of a number immediately followed by a unit name. Recognized unit names include: Unit Name
in inches mm millimeters cm centimeters pt points
mp millipoints (1/72000 inch)a millipoints a.Millipoints are retained for backwards compatability with very early versions of XFA, however the use of millipoints is deprecated.
Syntax
UnitValue(s1 [, s2])
Parameters
s1
is a unitspan string.
s2
is an optional string containing a unit name. The unitspan's value will be converted to the given units. If s2 is omitted, the unitspan's units are used.
Returns
The unitspan's value.
returns 2.54.
UnitValue("72pt", "in")
returns 1.
XFA Specification Chapter 25, FormCalc Specification Miscellaneous Built-in Functions 1001
UnitType()
Returns the units of a unitspan.
Syntax
UnitType(s1)
Parameters
s1
is a unitspan string.
Returns
The unitspan's units. Unit names are canonized as follows. Input unit name
in inches
mp mp millipoints
Note: Millipoints are retained for backwards compatability with very early versions of XFA. However the use of millipoints is deprecated.
returns "in".
UnitValue("2.54centimeters")
returns "cm".
26
Data output formatting and input parsing, as described in Localization and Canonicalization on page 139 Data conversion performed by some FormCalc functions, as described in FormCalc Specification on page 902
About
Picture clauses are a sequence of symbols (characters) that specify the rules for formatting and parsing textual data, such as dates, times, numbers and text. Each symbol is a place-holder that typically represents one or more characters that occur in the data. Picture clauses support the BMP (Basic Multilingual Plane) characters described in [Unicode-2.1].Often the terms pattern and picture format are used as synonyms for the term picture clause. A picture clause can be used equally for output formatting of data and input parsing of data. Output formatting is the process of transforming a raw value into a formatted value, under the direction of a picture clause. Input parsing is the process of transforming a formatted input value into a raw elemental value, again under the direction of a picture clause. The raw elemental values that result from input parsing are represented in the canonical formats described in Canonical Format Reference on page 898. Picture clauses can passively use the template-declared locale or the ambient locale, or they can specify a particular locale (language alone or a country and language). Additionally, date and time picture clauses can specify certain characteristics used in East Asian locales, including ideographs and full-width characters, Asian numeric system, era years, and era styles. (Asian Date, Time and Number Considerations on page 1012)
Role of picture clause Specifies the formatting to be applied to a date, which is supplied in canonical format
1002
XFA Specification Chapter 26, Picture Clause Specification Picture-Clause Building Blocks 1003
Input value
2157.5 50.6
Formatted result
2,157.5 50.60
The next example illustrates the result of applying the same picture clause to two input data values. The picture clause is designed to parse numeric values having up to seven significant digits, the three least significant digits being mandatory, with two of them being fractional digits; six and seven digit numbers must include a grouping separator.
Example 26.2 Numeric input parsed using the same picture clause
Picture clause
zz,zz9.99
Input value
2,157.50 50.60
Parsed result
2157.5 50.60
Due to the varying types of data that can benefit from the application of picture clauses, it is useful to divide the picture clause symbols into categories that correspond to a type of data. This permits us to reuse individual picture clause symbols across categories. For instance, the date picture clause D/M/YYYY makes use of the symbol M to represent the month portion of a date; however, it is equally useful to permit the symbol M to represent the minute portion of a time in the picture clause H:M:S. Note: Picture clause symbols are case-sensitive and must correspond exactly to this specification.
XFA Specification Chapter 26, Picture Clause Specification Picture-Clause Building Blocks 1004
Input parsing: Match any one character, as in a wild-card Output formatting: Format as a space Input parsing: Match zero or more whitespace charactersa Output formatting: Format as a space Input parsing. Match one or more whitespace charactersa Output formatting: Format as a space
a.The term whitespace characters means any [UNICODE] character classified as a break space. When input parsing, any whitespace character is accepted, and when output formatting, a single space character is emitted.
Output Formatting
When output formatting, literals are formatted verbatim into the output text. the following numeric picture clause examples include several literals (single-quoted and default). The following examples use double-underline to identify literals. The double underlines are not part of the picture clause expression.
Input value
2157.5 50.6
Formatted result
"You owe 2,157.50!" "You owe 50.60!"
Input Parsing
When input parsing, literals must match the input data verbatim, but never contribute to the resulting text, as illustrated in the following examples.
XFA Specification Chapter 26, Picture Clause Specification Picture-Clause Building Blocks 1005
Input value
You owe 2,157.50! You owe 50.60!
Formatted result
2157.50 50.60
Note: Any alphabetic or punctuation character appearing within a picture clause that is not specified by this document as a valid picture symbol and is not enclosed within quotes as a literal, is reserved for future use as a potential picture symbol and should be considered a user error irrespective of the current implementation behavior.
What a Locale Is When developing internationalized applications, a locale is the standard term used to identify a particular cultural context (language and/or country). A locale defines (but is not limited to) the format of dates, times, numeric and currency punctuation that are culturally relevant to a specific cultural context. A properly internationalized application will always rely on the locale to supply it with the format of dates and times. This way, users operating in their locale will always be presented with the date and time formats they are accustomed to.
A locale is identified by a code consisting of a language code, optionally followed by a (4-letter) script code, optionally followed by a country code, optionally followed by a variant code.
XFA Specification Chapter 26, Picture Clause Specification Picture-Clause Building Blocks 1006
XFA Specification Chapter 26, Picture Clause Specification Complex Picture-Clause Expressions 1007
category.subcategory{} category{picture-clause}category{picture-clause} [category{picture-clause}]a (locale){picture-clause} category(locale){picture-clause}category(locale) {picture-clause} picture-clause|picture-clause[|picture-clause...]a category(locale){picture-clause}| category(locale){picture-clause} [|category(locale){picture-clause}]a
a.Square brackets represent optional, repeating parts of a picture clause expression. They are not part of the picture clause.
where category-name is one of the keywords date, time, num, or text, and subcategory-name depends on category-name as shown in the following table. Note that the example data in the table may change over time as locale standards evolve. Category name
date
XFA Specification Chapter 26, Picture Clause Specification Complex Picture-Clause Expressions 1008
Category name
time
datetime short medium long full default num integer decimal currency percent
July 1, 2006 5:23:52 PM EDT 1 juillet 2006 17:23:52 CEST Saturday, July 1, 2006 5:23:52 PM EDT Jul 1, 2006 5:23:52 PM 1,234 1,234.56 $1,234.56 1,234% samedi 1 juillet 2006 17 h 23 CEST 1 juil. 2006 17:23:52 1.235 1.234,56 1.234,56 1.234%
The picture name default delegates to the XFA processor the selection of a predefined picture clause. Which one it picks is implementation defined. For example, Acrobat selects medium when default is specified. There is no default option for the num category. The predefined picture clauses for date, time and num are carried in the localeSet packet of the XDP and can be redefined by the form creator. See Locale Set Specification on page 806 for more information about the locale set packet. In contrast the datetime predefined picture is not exposed in the localeSet packet and cannot be redefined. For most locales it is the corresponding date picture, followed by a space (U+0020) character, followed by the corresponding time picture, however for some locales the order of date and time is reversed and for some locales the separator is not a space or there is no separator. Within the localeSet packet there are only three numeric picture clauses. The picture clause named numeric does double-duty. The integer part of it is used for num.integer formatting and the whole picture clause is used for num.decimal formatting.
XFA Specification Chapter 26, Picture Clause Specification Complex Picture-Clause Expressions 1009
Example 26.7 Date formatted two different ways using compound picture clauses
Picture clause
date{DD/MM/YY} '('date{MMM DD, YYYY}')'
Input value
1999-07-16
Formatted result
"16/07/99 (Jul 16, 1999)"
In the above example the data value represents a date. The same date is formatted and displayed in two different ways. Usually all of the picture clauses which are compounded together must be of the same category. This is because each category of picture clause expects a value formatted in a particular way. However date and time picture clauses, although they are different categories, may be compounded together when the value is a date-time string. Date-time strings are described in Date-Time on page 900. In the following example the date picture clause extracts and formats the date information from the date-time value, while the time picture clause extracts and formats the time information from the same date-time value.
Example 26.8 Date and time formatted separately using compound picture clauses
Picture clause
'At' time{HH:MM Z} 'on' date{MMM DD, YYYY}
Input value
Formatted result
where category-name is one of the keywords date, time, datetime, num, text, zero, or null, and picture-symbols corresponds to one or more picture symbols from a particular picture category. The characters enclosed within the curly braces are interpreted as part of the picture clause. Explicitly stating the category-name is not required for picture clauses that contain picture symbols from only one category; the processing application must attempt to infer the category based upon the symbols found in the picture clause. If the symbols are ambiguous or too complex to automatically identify to a category, then it is an error. Explicitly stating the category within the compound picture clause shall always take precedence over any other interpretation of the picture clause by the processing application. Brace characters are reserved for delineating compound picture clauses. Brace characters may be included as literals in picture clauses by enclosing them in quotation marks. Note that the quoted literals in the previous example could have appeared inside or outside of the braces with equal results. Therefore the following compound picture clauses are all equivalent.
XFA Specification Chapter 26, Picture Clause Specification Complex Picture-Clause Expressions 1010
or
category-name.subcategory-name(locale-name){}
where category-name and picture-symbols are as before, and locale-name is the name of a locale conformant to the locale naming standards defined above.
Input value
2002-10-25
Formatted result
25 octobre, 2002 viernes, 25 de octubre de 2002 25 octobre, 2002
Locale-specific compound picture clauses are supported; however, their usefulness is limited since most individual data items pertain to a single locale.
XFA Specification Chapter 26, Picture Clause Specification Complex Picture-Clause Expressions 1011
the right of the vertical bar character up to another vertical bar or the end of the picture clause is one picture clause alternative. The syntax for alternate picture clauses is:
picture-clause|picture-clause[|picture-clause...]
where picture-clause is as defined above, and the square brackets and ellipses denote optional, repeated, alternate picture clauses. Thus, the vertical bar character is reserved for delimiting alternate picture clauses, and therefore, must always be quoted within a picture clause to obtain the vertical bar literal character. During input parsing and output formatting against a set of alternate picture clauses, the XFA processing application chooses the picture clause to use, by sequentially matching the data against each picture clause in the expression, stopping when a match is found. The picture clauses are examined in order from left to right. The following table presents examples of input parsing with alternate picture clauses. The parsed result is the canonical format of the data. Picture clauses used for input parsing are relevant only when the picture clause appears in a ui, bind, or connect element.
Input value
"555 1212" "613 555 1212"
Parsed result
5551212 6135551212
""
Null
a.The input value does not match any of the picture clauses, so is left as-is. That is, additional processing or validation checks may be required before the data can be assumed to be in canonical format.
The following table presents examples of output formatting with alternate picture clauses.
Input data
5551212 6135551212
Formatted result
"555 1212" "613 555 1212"
Null Hello
a.The data does not match any of the picture clauses, so it is passed through unchanged.
XFA Specification Chapter 26, Picture Clause Specification Calendars and Locale 1012
The following table presents examples of input parsing with alternate picture clauses.
Input value
100.00
Parsed result
100
.
text(th_TH){999*9999}|text(th_TH_TH){999*9999}
555-1212
XFA Specification Chapter 26, Picture Clause Specification Asian Date, Time and Number Considerations 1013
Note: Henceforth, this section uses the term Asian to denote East Asian locales. Asian date representations may differ from Western ones in several respects:
Characters/ideographs. Asian dates may use full-width characters or ideographs rather than Latin numbers. (Using Full-Width Characters and Ideographs in Date and Time Data on page 1013) Numeric systems. Asian dates may use either the standard Arabic numeric system or another system, described in this document as the tens rule. (Tens Rule Numeric System on page 1014) Eras. Date picture clauses allow years to be represented in terms of the Gregorian calendar or in terms of imperial eras. (Imperial (Alternate) Eras and Alternate Era Styles on page 1014) Era name symbol styles. Some Asian locales use multiple character and ideographic styles for an era name. (Imperial (Alternate) Eras and Alternate Era Styles on page 1014)
ASCII digits 0-9 (U+30 to U+39) Unicode full-width digits 0-9 (U+FF10 - U+FF19) Ideographic numbers specific for the locale.
The following table illustrates such ideographic numbers. Universal Latin digits 0 1 2 3 4 5 6 7 8 Full-width digits
(U+FF10)
Hangul
(U+C601)
Hanja
(U+96F6)
(U+FF11)
(U+FF12)
(U+FF13)
(U+FF14)
(U+FF15)
(U+FF16)
(U+FF17)
(U+FF18)
0 1 2 3 4 5 6 7 8
(U+4E00)
(U+C77C)
(U+4E00)
(U+4E8C)
(U+C774)
(U+4E8C)
(U+4E09)
(U+C0BC)
(U+4E09)
(U+56DB)
(U+C0AC)
(U+56DB)
(U+4E94)
(U+C624)
(U+4E94)
(U+516D)
(U+C721)
(U+516D)
(U+4E03)
(U+CE60)
(U+4E03)
(U+516B)
(U+D314)
(U+516B)
XFA Specification Chapter 26, Picture Clause Specification Asian Date, Time and Number Considerations 1014
Hangul
(U+AD6C)
Hanja
(U+4E5D)
Arabic numeral system. In this system, numbers are, representing increasing orders of magnitude for every digit to the left of the (imaginary) decimal point. In this convention, the ideographic characters are simply concatenated together. For example, using Kanji digits, 10 ( ) is character 1 ( ) and 0 ( ) together, 11 ( ) is two occurrences of the character 1 ( ), while 32 ( ) is character 3 ( ) and 2 ( ) together. Tens rule. When using the tens rule to symbolically display a numeric value, the number of tens's ( ) and singletons are combined together. Thus, again using Kanji digits, 20 ( ) is 2 ( ) tens ( ), and 32 ( ) is 3 tens ( ) plus 2 ( ). As with all rules, there's an exception: 10 is represented using one ideograph ( ) and not ( ).
The tens rule naturally extends to values in the hundreds ( ) and in the thousands ( ). Only Korean years have values in the thousands. Future Taiwanese eras may have year values in the hundreds. Most other CKJ numeric values are in the tens.
Gregorian calendar era. The origin of a year is relative to the birth and death of Christ. This convention uses the era names BC and AD. In date picture clauses, the Gregorian calendar era is the primary or default era.
0001
001
01
(U+5341)
(U+C2ED)
(U+5341)
(U+767E)
(U+BC31)
(U+767E)
(U+5343)
(U+CC9C)
(U+5343)
XFA Specification Chapter 26, Picture Clause Specification Asian Date, Time and Number Considerations 1015
Imperial era. The origin of a year is the beginning of an emperors reign. In this convention, an era identifier precedes the year. The era identifier does not necessarily include the emperors name. In date picture clauses, the imperial era is called the alternate era. An Asian locale may use multiple era styles for imperial era identifiers, with each style using a different method for representing an imperial era. The following section describe era styles for the supported Asian locales.
An alternate era may be represented in several styles. For example, the following table shows the different era styles for the Heisei era.
Example 26.14 Representation of the Date Heisei era Style picture Character/Ideograph Unicode number symbol
1 2 3 4 5
g gg ggg
agg
ag
XFA Specification Chapter 26, Picture Clause Specification Asian Date, Time and Number Considerations 1016
Ideograph
Note: For the Tangun era, the value 2333 must be added to the current year. For example, the year 2004 is represented as 4337. Note: Korean numbers always use tens rule.
Chinese (Taiwan) dates and times always use the tens rule, with the following exception. When represented without the Chinese era, the year is represented using Arabic number format. For example, 2004 is represented as .
For dates from October 1, 1949, to present, there is no symbol for the Chinese imperial era. Numeric date and time values are always represented symbolically, using the tens rule, with the following exception. When represented without the Chinese era, the year is represented using the Arabic numeral system. For example, when unaccompanied with the era, the 2004 is represented . The symbols used to represent Chinese eras vary with locale. China represents eras using Simplified Chinese characters; whereas, Hong Kong and Macau use Traditional Chinese characters.
XFA Specification Chapter 26, Picture Clause Specification Asian Date, Time and Number Considerations 1017
Dates relative to the Gregorian calendar April 6, 1888 through March 31, 1912 April 1, 1912 through December 31, 1940 January 1, 1941 to present
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1018
Conventions
This reference uses the following font faces to differentiate picture clause symbols:
sss and SSS
and HHH
hhh
Is the picture symbol for 1- or 2-digit (1-31) day of the month. Zero-padded 2 digit (01-31) day of the month. 1-, 2- or 3-digit (1-366) day of the year. Zero-padded 3 digit (001-366) day of the year. 1- or 2-digit (1-12) month of the year. Zero-padded 2 digit (01-12) month of the year. Abbreviated month name of the prevailing locale. Full month name of the prevailing locale. 1-digit (1-7) day of the week, where 1 = Sunday. Abbreviated weekday name of the prevailing locale. Full weekday name of the prevailing locale.
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1019
Symbol
e
Is the picture symbol for 1 digit (1-7) day of the week, where 1 = Monday. This symbol is used in the context of the ISO Week Date format, where weeks start on Mondays rather than Sundays. Note: Expressions of the form eee and eeee are not supported because they duplicate the capability of the date picture symbols EEE and EEEE.
G YY YYYY w
Christian era name (BC or AD). 2-digit year, where 00 = 2000, 29 = 2029, 30 = 1930, and 99 = 1999. 4-digit year. 1-digit (0-5) week of the month. Week 1 of a month is the earliest set of four contiguous days in that month that ends on a Saturday. July 2004 Su Mo Tu We Th 1 4 5 6 7 8 Fr Sa 2 3 0 1 2 3 4 Week number
9 10
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
WW
2-digit (01-53) ISO-8601 week of the year. Week 01 of a year is the week containing January 4. See also Global Picture-Clause Symbols on page 1004, which describes the symbols "?", "*", and "+".
? * +
The comma (,), dash (-), colon (:), slash (/), period (.) and space ( ) are treated as literals.
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1020
Is the picture symbol for Alternate-era name of the prevailing locale, represented using alternate-era style 1. This symbol is meaningful only in Asian locales. In all other locales, the symbol specifies Christian era (BC/AD). See Imperial (Alternate) Eras and Alternate Era Styles on page 1014. See also the description for the full-width symbols (U+FF47) and on page 1021. Alternate-era name of the prevailing locale, represented using alternate-era style 2. This symbol is meaningful only in Asian locales. In all other locales, the symbol specifies Christian era (BC/AD).See Imperial (Alternate) Eras and Alternate Era Styles on page 1014. See also the description for the full-width symbols (U+FF47) and on page 1021. Alternate-era name of the prevailing locale represented using alternate-era style 3. This symbol is meaningful only in Asian locales. In all other locales, the symbol specifies Christian era (BC/AD). See Imperial (Alternate) Eras and Alternate Era Styles on page 1014. See also the description for the full-width symbols (U+FF47) and on page 1021.
gg
ggg
FW I I, tens rule FW FW
Zero-padded 2-digit full-width numeric value for the day of the month ( - ) Prevailing-locale ideographic numeric value for the day of the month. Tens rule prevailing-locale ideographic numeric value for the day of the month.
Zero-padded 3-digit full-width numeric value for the day of the year ) )
FW I
Zero-padded 2-digit full-width numeric value for the month of the year ( - ) Prevailing-locale ideographic numeric- value for the month of the year
21 1
(U+FF2D)
FW
663 1
(U+FF2A)
13 1
FW
gg gg
gg
g g
663 100(
13 10 21 10
D DD D
MMM
DD D
MM
DD JJJ M J
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1021
Full-width (FW) or ideographic (I) Is the picture symbol for I, tens rule I I Tens rule prevailing-locale ideographic numeric value for the month of the year. 1-digit (1-7) prevailing-locales ideographic numeric value for the day of the week, where 1 = Sunday. 1 digit (1-7) prevailing-locales ideographic numeric value for the day of the week, where 1 = Monday. This symbol is used in the context of the ISO Week Date format, where weeks start on Mondays rather than Sundays. Alternate-era name of the prevailing locale represented using alternate-era style 4. This symbol is meaningful only in Asian locales. In all other locales, the symbol specifies Christian era (BC/AD). See Imperial (Alternate) Eras and Alternate Era Styles on page 1014. Alternate-era name of the prevailing locale represented using alternate-era style 5. This symbol is meaningful only in Asian locales. In all other locales, the symbol specifies Christian era (BC/AD). See Imperial (Alternate) Eras and Alternate Era Styles on page 1014. 1-digit (0-5) full-width numeric value for the week of the month. Week 1 of a month is the earliest set of four contiguous days in that month that ends on a Saturday. July 2004 Su Mo Tu We Th 1 4 5 6 7 8 Fr Sa 2 3 0 1 2 3 4 Week number
10
35 10
M MMM
(U+FF25) (U+FF45)
WW
gg
E g e
(U+FF47)
(U+FF57)
FW
9 10
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 (U+FF37) FW
2-digit full-width numeric value for the ISO-8601 week of the year of a year is the week containing January 4. ( - ). Week
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1022
Full-width (FW) or ideographic (I) Is the picture symbol for Standard Latin digits 1- or 2-digit year. If any of the year symbols (Y, , , , , or ) are preceded by an imperial era symbol (g, gg, etc), the year is given in terms of that era. Further, the first year of any era is always represented using the ideograph (U+5143) rather than the full-width 1 or the full-width 01. If this symbol is not preceded by an alternate-era symbol, the year is given according to the Gregorian calendar. Note: The symbols Y and should be used only in the context of an imperial era, where the year has a reasonable single-digit representation.
(U+FF39)
FW FW I FW I, tens rule
1- or 2- digit full-width numeric value for the year value. (See description for Y.) 2-digit full-width numeric value for the year value. (See description for Y.) Prevailing-locale ideographic numeric value for year. (See description for Y.) Full-width 4 digit year value. (See description for Y.) Tens rule prevailing-locale ideographic numeric value for year. (See description for Y.)
The full-width comma (U+FF0C), dash (U+FF0D), colon (U+FF1A), slash (U+FF0F), and period (U+FF0E) are treated as literals.
Y Y YY Y
YY Y Y Y Y Y Y Y Y
YY Y Y Y
YYYY
YYY
YY
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1023
Explanation The year cannot be reasonably deduced with the information provided. Date picture clauses with adjacent one letter picture symbols are ambiguous. With a picture clause of YYMD, an input of "99121" can be evaluated as either "Jan 21, 1999" or "Dec 1, 1999".
Explanation As a concession to present day realities, the two-digit years 00 to 29 are interpreted as the years 2000 to 2029, while the two-digit years 30 to 99 are interpreted as the years 1930 to 1999. This is known as the century split option, and the century split year is set by default to 30; it is expected that applications using picture clauses would be able to reconfigure the century split year. Important: It is strongly recommended that applications interchange data with fully specified years.
Example 26.18 Picture clauses with multiple symbols that are unacceptable for parsing input
Unacceptable multiple sets of symbols
DD/MM/DD JJJ-DD-MMM-YY
Explanation The DD symbol appears twice. The JJJ and DD symbols both format days.
When output formatting, date picture clauses with multiple instances of the same symbols are acceptable, as are date formats with conflicting symbols.
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1024
Input value
2002-10-25 20040722 20040722 20040722
Formatted result
"October 25, 2002" "Week of the month is 5" 4 days after Sunday 2004-W30-4
YYYY-'W'WW-e
Input value
12/2/99 Jan 10, 1999
Parsed result
1999-12-02 1999-01-10
Example 26.21 Input and output using picture clauses in the Japanese locale
Picture clause
gY/M/D ggY-M-D YY/MM/DD ' ' ' ' '
Input value
2003-11-03 1989-01-08 1989-11-03 2003-11-03 ' ' 1989-01-08
Formatted result
H15/11/3
Explanation Alternate-era style #1 Alternate-era style #2 Alternate-era style #5 Alternate-era style Alternate-era style 3, ideographic year. The pictograph represents the first year in the Heisei impereal era.
DD D
MM M
YYY
ggg
'
'
gg
gg '
' '
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1025
Picture clause
Input value
Formatted result
Time Pictures
Symbols used for time picture clauses apply to all locales (Standard Symbols) or apply primarily to Asian locales (Asian Time Picture Symbols). The category of such picture clauses is identified as time.
Standard Symbols
The standard picture clause symbols for time are: Symbol
h hh h hh k kk H HH K KK M MM S SS FFF A Z
Is the picture symbol for 1 or 2 digit (1-12) hour of the meridiem (AM/PM), expressed as a 12-hour clock. 2 digit (01-12) hour of the meridiem (AM/PM)), expressed as a 12-hour clock. 1- or 2-digit (1-12) hour of the meridiem (AM/PM). 2-digit (01-12) hour of the meridiem (AM/PM). 1- or 2-digit (0-11) hour of the meridiem (AM/PM). 2-digit (00-11) hour of the meridiem (AM/PM). 1- or 2-digit (0-23) hour of the day, expressed as a 24-hour clock. Zero-padded 2 digit (00-23) hour of the day, expressed as a 24-hour clock. 1- or 2-digit (1-24) hour of the day. Zero-padded 2 digit (01-24) hour of the day. 1- or 2-digit (0-59) minute of the hour. 2-digit (00-59) minute of the hour. 1- or 2-digit (0-59) second of the minute. 2-digit (00-59) second of the minute. 3-digit (000-999) thousandth of the second. Meridiem name (AM or PM) of the prevailing locale. Abbreviated time-zone name (GMT, EST, GMT-00:30) of the prevailing locale.
D DD
MMM
'
'
' '
DD
MM
YYY
YY
'
'
' '
1989-12-23 1998-12-10
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1026
Symbol
z
Is the picture symbol for ISO-8601 time-zone format: Z, +HH[MM], or -HH[MM]. In the examples at left, HH is a placeholder for a zero-padded 2-digit hour of the day, and the MM is a placeholder for a zero-padded 2-digit minute of the hour. The acceptable values for z are further described below:
Z. A time zone of 'Z' (Unicode character U+005A) indicates the time zone is 'zero meridian', or 'Zulu Time'. The [ISO-8601] section titled Universal Time Coordinated describes a method of defining time absolutely. Another helpful document is A Few Facts Concerning GMT, UT, and the RGO, by R. Langley, 20 January 1999, which is available at http://www.apparent-wind.com/gmt-explained.html. +HH[MM] or -HH[MM]. A time zone expressed as an offset of plus or minus states that the offset can be added to the time to indicate that the local time zone is HH hours and MM minutes ahead or behind. The plus or minus sign must be included.
zz
Alternate ISO-8601 time-zone format: Z, +HH[:MM], or -HH[:MM]. The z and zz formats differ only in their use of the colon as a separator. See also Global Picture-Clause Symbols on page 1004, which describes the symbols "?", "*", and "+".
The standard and full-width comma (,), dash (-), colon (:), slash (/), period (.) and space ( ) are treated as literals.
Symbol (U+FF48)
(U+FF4B)
Prevailing locale's ideographic numeric value (0-11) for the hour of the meridiem.
11 00
2-digit ( (AM/PM).
21 1
21 10
11 0
hhhh
hhh
kk k
hh kk k
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1027
Symbol
Full-width (FW) or ideographic (I) Is the picture symbol for I, tens rule FW FW I I, tens rule FW FW I I, tens rule FW FW FW I, tens rule FW FW I I, tens rule FW FW Prevailing locale's tens rule ideographic numeric value (0-11) for the hour of the meridiem. 1 or 2 digit (0-23) full-width numeric value for the hour of the day, expressed as a 24-hour clock. Zero-padded 2-digit (00-23) full-width numeric value for the hour of the day, expressed as a 24-hour clock. Prevailing locale's ideographic numeric value (0-23) for the hour of the day. Prevailing locale's tens rule ideographic numeric value (0-23) for the hour of the day. 1- or 2-digit (1-24) full-width numeric value for the hour of the day. Zero-padded 2-digit (01-24) full-width numeric value for the hour of the day. Prevailing locale's ideographic numeric value for the (1-24) hour of the day. Prevailing locale's tens rule ideographic numeric value for the (1-24) hour of the day 1- or 2-digit (0-59) full-width numeric value for the minute of the hour. 2-digit (00-59) full-width numeric value for the minute of the hour. Prevailing locale's ideographic numeric value (0-59) for the minute of the hour. Prevailing locale's tens rule ideographic numeric value (0-59) for the minute of the hour 1- or 2-digit (0-59) full-width numeric value for the second of the minute. 2-digit (00-59) full-width numeric value for the second of the minute. Prevailing locale's ideographic numeric value (0-59) for the second of the minute. Prevailing locale's tens rule ideographic numeric value (0-59) for the second of the minute. 3-digit (000-999) full-width numeric value for the thousandth of the second. Full-width ISO-8601 time-zone format: , [ ], or [ ]. All characters are full-width. In the above examples, is a placeholder for an hour digit, and the is a placeholder for a minute digit.
MM HH-
H M M H H+ Z
M MMM
HH HH
MMM
KK K K
H HH
KKK
k kk k
(U+FF28)
SS SS
MM
HH
(U+FF2B)
F FF
S SS
KK
SS
H K S z
(U+FF2D)
(U+FF33)
(U+FF26)
(U+FF5A)
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1028
Symbol
See also Global Picture-Clause Symbols on page 1004, which describes the symbols "?", "*", and "+". The standard and full-width comma (,), dash (-), colon (:), slash (/), period (.) and space ( ) are treated as literals.
Input value
11:11:11 11:11:11 14:30:59 14:30:59
Formatted result
"11:11 AM" "11:11:11 o'clock AM EDT" "2:30 PM" "14:30:59 PM EDT"
When input parsing with time picture clauses, a successfully parsed input value is returned as an ISO local time string of the form
HH[MM[SS[.FFF][z]]] HH[MM[SS[.FFF][+HH[MM]]]] HH[MM[SS[.FFF][-HH[MM]]]] HH[:MM[:SS[.FFF][z]]] HH[:MM[:SS[.FFF][-HH[:MM]]]] HH[:MM[:SS[.FFF][+HH[:MM]]]]
M M : H H+ Z
FW
], or
MM: HH-
zz
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1029
Input value
18:00 12.59 Uhr 1:05:10 PM PST
Parsed result
18 12:59 17:05:10
Note: The return value in the last example will vary with the platform's timezone at the time the platform was parsing the input; the displayed result comes from a platform running on EDT.
Example 26.24 Input parsed using time picture clauses in Asian locales
Picture clause
time(ja){Ahh' 'MM' ' ' 'DD' ' ' '} ' '}
Input value
Parsed result
17:02:03 12:35:46
This example specifies ideographic hours (24-hour clock), minutes and seconds. Although the picture symbols do not specify tens-rule, the numbers use it because all Korean ideographic numbers use tens rule.
This example specifies tens-rule ideographic hours, minutes and seconds. The hours are meridiem.
+ 1
a.The parsed result reflects the current time zone. This result indicates the user resides in the Central European Time timezone. If the user resided elsewhere, the parsed result would differ.
Numeric Pictures
The following table describes the standard ASCII and full-width numeric picture clause symbols. The category of such picture clauses is identified as num. Full-width symbols can be used in Asian locales to specify full-width data.
0 0 3: 3 1
SSS S
MMMM
hhhhA
time(ja){
'
'
'
SSS
M MM
KK K
time(ko){
'
'
'}
12:01:02
13:30:00+01a
z z M M: H H
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1030
Full-width
(U+FF19) Output formatting: a single digit, or for the zero digit if the input data is empty or a space in the corresponding position. Input parsing: a single digit.
$$
$$
(U+FF18) Output formatting: a single digit, or for nothing if the input data has nothing in the corresponding position. For more information see Effect of the 8 Picture Symbol on page 1032. Input parsing: a single digit or nothing. (U+FF5A) Output formatting: a single digit, or for nothing if the input data is empty, a space, or the zero digit in the corresponding position. For more information see Uppercase Picture Symbols versus Lowercase Picture Symbols on page 1031. Input parsing: a single digit or nothing. (U+FF3A) Output formatting: a single digit, or for a space if the input data is empty, a space, or the zero digit in the corresponding position. For more information see Uppercase Picture Symbols versus Lowercase Picture Symbols on page 1031. Input parsing: a single digit or a space. (U+FF33) Output formatting: a minus sign if the number is negative, and a space otherwise. Input parsing: a minus sign if the number is negative and a plus sign if the number is positive. (U+FF53) Output formatting: a minus sign if the number is negative, and nothing otherwise. Input parsing, it is also the picture symbol for a plus sign if the number is positive. (U+FF25) Output formatting: the exponent part of a floating point number, consisting of the exponential symbol (E), followed by an optional plus or minus sign, followed by the exponent value. Input parsing: Same as for output formatting. (U+FF04) Currency symbol of the prevailing locale. In cases where the symbol may be ambiguous, please use the $$ symbol. For example, the dollar symbol applies equally to the Canadian dollar and the U.S. dollar. International currency name of the prevailing locale, as described in [ISO-4217].
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1031
Full-width
Is the picture symbol for Credit symbol (CR) if the number is negative, or spaces otherwise. Note: CR and DB are English-language accounting practices and may not be meaningful in other locales.
cr
Credit symbol (CR) if the number is negative, or nothing otherwise. Note: CR and DB are English-language accounting practices and may not be meaningful in other locales.
DB
Debit symbol (DB) if the number is negative, or spaces otherwise. Note: CR and DB are English-language accounting practices and may not be meaningful in other locales.
db
Debit symbol (DB) if the number is negative, or nothing otherwise. Note: CR and DB are English-language accounting practices and may not be meaningful in other locales.
The standard and full-width dash (-), colon (:), slash (/), and space ( ) are treated as literals. Unlike the other categories of picture clauses, the comma is omitted as a literal because it is used as the symbol for grouping separators.
, (comma)
. (period)
Left parenthesis if the number is negative, or a space otherwise. Right parenthesis if the number is negative, or a space otherwise. Decimal radix of the prevailing locale. See also Uppercase Picture Symbols versus Lowercase Picture Symbols on page 1031.
(U+FF36) Decimal radix of the prevailing locale, allowing the decimal radix to be implied when input parsing. (U+FF56) Decimal radix of the prevailing locale, allowing the decimal radix to be implied when input parsing and output formatting. (U+FF0C) Grouping separator of the prevailing locale Percent symbol of the prevailing locale. For more information see Effect of the % Picture Symbol on page 1033. See also Global Picture-Clause Symbols on page 1004, which describes the symbols "?", "*", and "+".
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1032
1. Lowercase z to the left of the . (period) picture symbol omits leading zeros, whereas uppercase Z in this position displays leading zeros as space characters. This also applies if the picture clause does not contain a . (period) picture symbol. 2. Lowercase z to the right of the . (period) picture symbol omits the radix point when the input number does not have it, whereas uppercase Z in this position always inserts the radix point.
1. Lowercase (U+FF5A) to the left of the (U+FF0E) picture symbol omits leading zeros, whereas uppercase (U+FF3A) in this position displays leading zeros as space characters. This also applies if the picture clause does not contain a (U+FF0E) picture symbol. 2. Lowercase (U+FF5A) to the right of the (U+FF0E) picture symbol omits the radix point when the input number does not have it, whereas uppercase (U+FF3A) in this position always inserts the radix point. The following table shows differences in the formatting of output strings when Z is used in place of z in a picture clause. The output strings are shown within quotation marks to make the string boundaries apparent, however the quotation marks would not be included in the formatted output.
Z z z
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1033
Example 26.26 Input parsed using numeric pictures containing the '8' symbol
Picture clause
zzz,zz9.8888
Input value
123456.000 123456.0 123456
Formatted result
123,456.000 123,456.0 123,456 123,456
zzz,zz9.88
123456
Note that, as for the lower-case z picture symbol, when the input number is an exact integer the decimal radix is removed from the formatted result.
Example 26.27 Input and output using numeric picture clauses containing the '%' symbol
Picture clause
zz9% zzz,zz9.99%
Input value
12% 1,234.5%
Output value
12% 1,234.50%
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1034
Input value
-1.23 1.23 123
Formatted results
"-00123" " 001.23" " 123.00" " 12.30"
SZZ9.99
12.3 -12.3
szz9.99
123 -123
$ZZ,ZZ9.99CR
1234 -1234
1,234.00CR"
$z,zz9.99DB
1234 -1234
99.999E
12345 .12345
Input value
1050 3125
Parsed results
10.50 31.25 12345 .12345 150 150 10.50 3125.00 1234.00 -1234.00
99.999E
12.345E3 12.345E-2
z999
150 0150
z,zz9.99
10.50 3,125.00
$z,zz9.99DB
$1,234.00 $1,234.00DB
If the distinction between various numeric picture symbols appears subtle, it's to provide the flexibility normally required when strict parsing and formatting rules are in place. For instance, a number value of
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1035
150 should be accepted given the picture clause z999; the addition of a leading zero to the value does not change the value from 150, i.e., the values 0150 and 150 are equivalent. Similarly the picture clause S9999 would accept the value -5000 or +5000 or 5000.
Example 26.30 Output formatted using numeric picture clauses with full-width characters
In the examples below results have been quoted, so that one can see where spaces would appear in the formatted value. The quotes are not actually part of the result. Input value (English language locale) Formatted results
Picture clause
Text Pictures
The following table describes the text picture clause symbols. The category of such picture clauses is identified as text. Symbol
A X
3- E543 .21
.12345
3+ E543 .21
12345
00. 432,1 $ -
-1234
"
00.432 ,1 $
1234
"
00.321 -
-123
"
00 .321
123
"
03.21 -
-12.3
"
03 .21
12.3
"
00 .321
123
"
32 .100
1.23
"
32100 -
-1.23
"
s99 .9 Z Z,Z Z$
99v99 9S
" "
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1036
Symbol
9
Is the picture symbol for Single digit. See also Global Picture-Clause Symbols on page 1004, which describes the symbols "?", "*", and "+".
The standard and full-width comma (,), dash (-), colon (:), slash (/), period (.) and space ( ) are treated as literals.
Input value
K1S5K2 6135551212 6135551212
Formatted result
"K1S 5K2" "+1 (613) 555-1212" "613.555.1212"
The following table shows the result of applying this picture clause as an input mask against various input strings. Results have been quoted, so that one can see where spaces would appear in the formatted value. The quotes are not actually part of the result. Picture clause
AAA-9999-X
Input value
ABC-1234-5 ABC-1234-D 123-4567-8a
Formatted result
"ABC12345" "ABC1234D" ""a
a.Note that the input data 123-4567-8 did not satisfy the input mask, and the resulting parsed value was an empty string.
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1037
See also Compound Picture Clauses on page 1008 and Numeric Pictures on page 1029. Null-category picture clauses are typically used in alternate picture clause expressions, such as the following.
Example 26.34 Null-category picture clause used to differentiate null and non-null data
Null-category picture clauses are especially useful when there is a difference between null-data and non-null data. In the example at right, the field labeled "Tax withheld" remains blank until the person filling out the form supplies a value. The illustrated behavior is specified by the picture clause null{}|num{$z,zz9.99}.
See also Compound Picture Clauses on page 1008 and Numeric Pictures on page 1029. As with null-category picture clauses, zero-category picture clauses are typically used in alternate picture clause expressions, such as the following.
XFA Specification Chapter 26, Picture Clause Specification Picture Clause Reference 1038
where spaces would appear in the formatted value. The quotes are not actually part of the result. The word null without quotation marks represents null data.
Example 26.36 Input parsed against null- and zero-category alternate picture clauses
Picture clause
null{'n/a'} | zero {9} | num{z,zz9.9}
Input value
""
Note: Order is important in expressions that use alternative picture clauses. If the picture clause num{z,zz9.9} is the first picture clause in the expression, the zero{9} picture clause is never considered.
Example 26.37 Output formatted by null- and zero-category alternate picture clauses
Picture clause
null{'n/a'} | zero {9} | num{z,zz9.9}
Formatted output
"n/a"
"0" "1,234.5"
Note: Order is important in expressions that use alternative picture clauses. If the picture clause num{z,zz9.9} is the first picture clause in the expression, the zero{9} picture clause is never considered.
27
Where described Bold on page 1047 Line Break on page 1042 Body Element on page 1041 HTML Element on page 1040 Italic on page 1050 Paragraph on page 1043 Span on page 1050 Subscript on page 1050 Superscript on page 1051
XFA processors support the following [CSS2] style attributes on the above-listed [XHTML] elements: Attribute name
color
1039
XFA Specification Chapter 27, Rich Text Reference Supported Container Elements 1040
Attribute name
font font-family font-size font-stretch font-style font-weight margin margin-bottom margin-left margin-right margin-top line-height tab-interval tab-stop text-decoration text-indent vertical-align
Set Margins on page 1044 Space After Paragraph on page 1044 Left Margin on page 1042 Right Margin on page 1043 Space Before Paragraph on page 1045 Line Spacing on page 1042 Tab Stops on page 1051
Underline and Strikethrough on page 1053 First Line Indent on page 1041 Vertical Alignment on page 1045
This specification supports the following subset of allowable [CSS2] measurement units:
HTML Element
The outer element for HTML documents is an html element, as specified in [XHTML]. In XFA rich text may be enclosed in an html element, although this is not required. The html element is merely a container and does not appear in the output.
XFA Specification Chapter 27, Rich Text Reference Supported Paragraph Formatting 1041
Body Element
The displayable content of an HTML document is contained in a body element, as specified in [XHTML]. In XFA rich text may be enclosed in a body element, although this is not required. It may also be enclosed in a body element that is itself within an html element. The body element is merely a container and does not appear in the output.
Produces:
The first line of this paragraph is indented a half-inch. Successive lines are not indented. This is the last line of the paragraph.
Horizontal Alignment
A paragraph of text may be aligned horizontally via the use of the [CSS2] text-align style attribute. The supported alignments are limited to left, center, right, justify, and justify-all. justify-all is a non-standard extension to [CSS2] expressing that all lines of the paragraph including the last line shall be justified.
Produces:
This is the first line of the paragraph. This is the second line of the paragraph. This is the last line of the paragraph.
XFA Specification Chapter 27, Rich Text Reference Supported Paragraph Formatting 1042
Left Margin
A paragraph of text may be indented on the left (adjusting the left margin) via the use of the [CSS2] margin-left style attribute with a measurement.
Produces:
This text is left-indented a half-inch.
Line Break
Within a paragraph, br elements may be used to force line breaks as defined in [XHTML]. Example:
<p>This is a paragraph of text.<br/>This is some more text.</p>
Produces:
This is a paragraph of text. This is some more text.
Line Spacing
A paragraph of text may have the line-spacing of its text set via the use of the [CSS2] line-height style attribute with a measurement. By default, line-spacing is derived from the tallest object on any given line.
XFA Specification Chapter 27, Rich Text Reference Supported Paragraph Formatting 1043
Produces:
Paragraph
A paragraph of text is expressed using the [XHTML] paragraph p element. By default text contained within the p element flows from left-to-right, word-wrapping as necessary to fit within the left and right margins. By default consecutive white space characters are compressed to a single space character. p elements cannot nest, nor can they hold html or body elements.
Produces:
This is a paragraph of text. This is some more text.
The paragraph element may have attributes that format the paragraph, as described in the following subsections. The left-to-right flow may be interrupted by a br element, as described in Line Break on page 1042.
Right Margin
A paragraph of text may be indented on the right (adjusting the right margin) via the use of the [CSS2] margin-right style attribute with a measurement. This is most commonly used in concert with a right text alignment, as described in Horizontal Alignment.
Produces:
This text is right-aligned and right-indented a half-inch.
XFA Specification Chapter 27, Rich Text Reference Supported Paragraph Formatting 1044
Set Margins
One or more margins may be adjusted, affecting paragraph spacing and indenting, through the use of the [CSS2] margin style attribute which accepts a variable number of arguments affecting the top, bottom, left, and right margins. Use of this attribute provides no additional features beyond the individually addressable features described in sections Space Before Paragraph, Space After Paragraph, Line Spacing, Left Margin, Right Margin, and First Line Indent. The syntax of the margin style attribute is explained in the following excerpt from the [CSS2] specification: If there is only one value, it applies to all sides. If there are two values, the top and bottom margins are set to the first value and the right and left margins are set to the second. If there are three values, the top is set to the first value, the left and right are set to the second, and the bottom is set to the third. If there are four values, they apply to the top, right, bottom, and left, respectively.
Produces:
This is the first paragraph.
XFA Specification Chapter 27, Rich Text Reference Supported Paragraph Formatting 1045
Produces:
This paragraph is spaced a half-inch away from the next paragraph.
Produces:
This is a paragraph of text.
Vertical Alignment
A paragraph of text may be aligned vertically via the use of a text-valign style attribute which is a non-standard extension to [CSS2]. The supported alignments are limited to top, middle, and bottom.
Produces:
This is the first line of the paragraph. This is the second line of the paragraph. This is the last line of the paragraph.
XFA Specification Chapter 27, Rich Text Reference Supported Character Formatting 1046
Baseline Adjustment
A region of text may have its baseline position raised or lowered within a line of text via the use of the [CSS2] vertical-align style attribute. The font size of the text is not affected. This specification supports a restricted set of [CSS2] vertical-align formats, hence, this attribute is defined as:
vertical-align:vAlginValue
where vAlignValue is either the keyword baseline or a measurement. If vAlignValue is baseline, the region of text will have its baseline situated on the calculated baseline for the surrounding line of text. Note that this behavior differs from [CSS2] where the region of text has its baseline situated on the calculated baseline for the surround parent span element rather than the surrounding line. If vAlignValue is a measurement, the region of text will have its baseline raised for a positive measurement or lowered for a negative measurement in relation to the calculated baseline for the surrounding line of text. A measurement of zero (0) produces the same result as vertical-align:baseline.
XFA Specification Chapter 27, Rich Text Reference Supported Character Formatting 1047
Produces:
This sentence contains lowered text on a line. Most of this sentence is lowered but this word appears on the line's baseline. This sentence contains raised text on a line.
Superscripts and subscripts can be implemented using a combination of a baseline adjustment and font size adjustment. However, vertical alignment can also be adjusted using sub (subscript) and sup (superscript) elements.
Bold
A region of text may be in bold type via the use of the [CSS2] font-weight style attribute or the b [XHTML] element.
Produces:
The second and fourth words are bold.
Color
A color may be specified for a region of text via the [CSS2] color style attribute. Color rendition is deviceand implementation-specific so the text may be rendered in a color other than the specified color. Conforming implementations are merely required to make their best effort to render the requested color. For example, when printing with a monochrome printer, colors other than black and white are usually rendered as grey. This specification supports a restricted set of [CSS2] color-value formats, defined as:
color:colorValue colorValue values are described in the following table.
"colorValue" value
#rrggbb
Specifies colors RGB value as Hexadecimal notation with a two-digit non-negative hexadecimal value each for red, green, and blue. A value of 00 means the color is absent (zero-intensity) whereas ff means it is at full intensity. Digits a through f may be upper or lower case. Separate non-negative integer decimal values for red, green, and blue. A value of 0 means the color is absent (zero-intensity) whereas 255 means it is at full intensity.
rgb(r,g,b)
XFA Specification Chapter 27, Rich Text Reference Supported Character Formatting 1048
The value is an RGB value specified in the sRGB color space [SRGB].
Produces: All of this text is blue except for this green word.
Font
A region of text may be in a specific font via the use of one or more of the [CSS2] font style attributes; the deprecated font HTML element is not supported. The [CSS2] specification provides several style attributes that affect the current font. Font style attribute
line-height:lineHeight font-family:fontFamilyName
Description
lineHeight is a measurement giving the distance between baselines of adjacent lines fontFamilyName is a list of one or more typeface names. The list constitutes a search path such that the glyph for any particular character is taken from the first font on the list which contains a glyph for that character. If a typeface name contains white space, it must be enclosed either within single quote (') characters or within double quote (") characters. Such punctuation allows the font name to be parsed as a single parameter.
ultra-condensed extra-condensed condensed semi-condensed normal, the default semi-expanded expanded extra-expanded ultra-expanded
XFA Specification Chapter 27, Rich Text Reference Supported Character Formatting 1049
Description
styleName is one of:
normal, the text appearance will be normal (Roman) italic, the text appearance will be oblique or slanted
font-weight:weightName
normal, the text appearance will be at the font's normal (default) weight bold, the text appearance will be in a bold type 100, 200, 300, 400, 500, 600, 700, 800, or 900, the text appearance will approximate as closely as possible a weight corresponding to the number, using a scale upon which normal is equivalent to 400 and bold is equivalent to 700
Note: Acrobat does not support numeric weights. Alternatively, multiple font properties may be defined at once using the following syntax:
font:[ styleName ] [ weightName ] characterHeight [ / lineHeight ] fontFamilyName
or
font:[ weightName ] [ styleName ] characterHeight [ / lineHeight ] fontFamilyName
where styleName, weightName, characterHeight, lineHeight, and fontFamilyName are as defined above. The character "/" (U002F) preceding lineHeight is a literal. The styleName and weightName parameters, if present, can be specified in either order. When an optional parameter is omitted, the result is to set the corresponding property to its default. This syntax is a subset of the corresponding [CSS2] syntax.
XFA Specification Chapter 27, Rich Text Reference Supported Character Formatting 1050
Produces:
The base font for this text is Minion Pro italic bold 16pt with a line-spacing of a half-inch. The second sentence switches to a Courier Std typeface.
to a 12-point font. The last sentence switches
Italic
A region of text may be italicized via the use of the [CSS2] font-style style attribute or the i [XHTML] element.
Produces:
The second and fourth words are italicized.
Span
The span element has no formatting effect of its own, but it accepts formatting attributes and applies those attributes to whatever it encloses, as defined by the [CSS2] and [XHTML] specifications. However XFA imposes an additional restriction, namely that span elements can not nest.
Subscript
A region of text may have its baseline position lowered within a line of text via the use of the [XHTML] sub element. The effect is to lower the baseline by 15% of the current font height, and to set a new font height which is 66% of the current font height.
Produces:
This sentence contains
lowered text
on a line.
XFA Specification Chapter 27, Rich Text Reference Supported Character Formatting 1051
Subscripts with other baseline and height parameters can be achieved using a combination of the vertical-align and line-height style attributes.
sub elements must not contain sub or sup elements. In addition they must not contain span elements that assert vertical-align or font-size.
Superscript
A region of text may have its baseline position raised within a line of text via the use of the [XHTML] sup element. The effect is to raise the baseline by 31% the current font height, and to set a new font height which is 66% of the current font height.
Produces:
This sentence contains
raised text
on a line.
Superscripts with other baseline and height parameters can be achieved using a combination of the vertical-align and line-height style attributes.
sup elements must not contain sub or sup elements. In addition they must not contain span elements that assert vertical-align or font-size.
Tab Stops
Tab stops are not a feature provided by [CSS2] or the [XHTML] specification, however, the following extensions are provided for setting tab-stops at either a repeating interval or at specific locations. For compatibility with [XHTML], tabs are invoked using an element with a style attribute. The ASCII tab character (U0009) is ordinary white space that does not advance to the next tab-stop. Default tab stops may be set at a repeating interval via the use of a nonstandard [CSS2] style attribute tab-interval. The default tab stops occur at every multiple of the specified measurement value. However, these tab stops are in effect only beyond the positions specified by the nonstandard [CSS2] style attribute tab-stops described below. As a consequence, if no tab stops were defined with the tab stops attribute then all of the default tab stop positions will be in effect. Default tab stops are always left tabs, that is, after advancing to the tab stop subsequent text is left-aligned with the tab stop. This attribute is defined as:
tab-interval:size
where size is a non-zero measurement A span element with a style attribute of xfa-tab-count may be used to advance by a specific number of tab-stops relative to the current position. The span element is recommended to be empty, as any text or markup that is contained within the span may be discarded by an XFA processing application.
xfa-tab-count:count
XFA Specification Chapter 27, Rich Text Reference Supported Character Formatting 1052
where count is a non-negative integer representing the number of tabs-stops to advance When count is zero the xfa-tab-count attribute must have no effect.
Produces:
A B C
Tab-stops may be set at specific locations via the use of a nonstandard [CSS2] style attribute tab-stops. This attribute is defined as:
tab-stops:align measurement[ align measurement]...
Note: This document uses the monospaced italics type face to indicate placeholders. In actual use, meaningful values replace such placeholders.
align values are described in the following table.
"align" value
center left right decimal
Effect Center-aligned tab stop Left-aligned tab stop Right-aligned tab stop Tab-stop that aligns content around a radix point
A center-aligned tab stop causes the text following the tab to be centered on the tab stop position. A left-aligned tab stop causes the text following the tab to be left-aligned with the tab stop position. A right-aligned tab stop causes the text following the tab to be right-aligned with the tab stop position. A radix-aligned tab stop is used with numeric data. It causes the text following the tab to be aligned with its radix character (for example, in English-speaking locales) left-aligned with the tab stop position. If the text has no radix character the text is right-aligned with the tab stop position. The determination of the appropriate radix character for the locale is implementation-defined. The cursor position starts at the left margin and the tab index starts at zero upon entry to the element that declares the tab-stops. Within a p element that declares tab-stops, a br element restarts the cursor position at the left margin and the tab index at zero.
XFA Specification Chapter 27, Rich Text Reference Supported Character Formatting 1053
Produces:
Charles Alice Porter Crawford
Produces:
1.2345 99 -.033 $ 17.70 plus tax
or
text-decoration: line-through [ decorationStyle ]
Produces Single continuous underline Single underline that breaks at word boundaries Double continuous underline Double underline that breaks at word boundaries
Note that double word has whitespace between the words, not a hyphen.
XFA Specification Chapter 27, Rich Text Reference Retaining Consecutive Spaces (xfa-spacerun:yes) 1054
Produces:
The second and fourth words are underlined.
Produces:
The second and fourth words appear with strikethrough.
The above example also demonstrates that a region of text may have both an underline and strikethrough by applying the [CSS2] text-decoration style attribute with multiple values.
XFA Specification Chapter 27, Rich Text Reference Retaining Consecutive Spaces (xfa-spacerun:yes) 1055
Produces:
Two spaces here: ; and three spaces here: before the next word.
The same result as above is produced by an application that supports this feature regardless of whether the span element contains non-breaking-space or normal-space characters.
Produces:
Two spaces here: and three spaces here: before the next word.
An application that supports this feature must process any character other than a non-breaking-space or normal-space character as normal text content.
Produces:
All of this is ordinary text.
XFA Specification Chapter 27, Rich Text Reference Embedded Object Specifications 1056
xfa:embedType
An attribute that specifies the type of reference in xfa:embed.
som
xfa:embed
An attribute that provides a SOM or URI reference to the text being embedded.
xfa:embedMode
An attribute that specifes whether styling markup specification in the imported text should be respected.
formatted
Version Specification
In the HTML body element, the XFA grammar defines several attributes that specify the version of rich text supported and the version of the API used to produce the rich text.
XFA Specification Chapter 27, Rich Text Reference Version Specification 1057
</body>
Correlating updates to this specification with the software that processes the rich text Allowing future revisions of the software to apply special processing to the rich text that was produced by earlier releases of the software
xfa:APIVersion
A concatenation of numeric fields that specify the version of the software used to produce the enclosing rich text. Numeric fields are separated from one another with periods, and each numeric field contains a whole number. The larger the number, the more recent the version. The further left the field, the more significant it is. When comparing two version identifiers, if one identifier has fewer fields than the other, the one with fewer fields must be extended by padding it on the right with fields containing 0. The syntax of xfa:APIVersion is
xfa:APIVersion=releaseID
where releaseID is a version identifier representing the version of the software that produced the document. If the xfa:APIVersion attribute is omitted from rich text, it should be assumed that the application producing the rich text has used markup attributes that correspond to the latest revision of this specification (XFA Specification). The features described by this specification are supported by Adobe XFA rich text processing software bearing an xfa:APIVersion attribute of "2.6.7185.0" or later.
xfa:spec
The version of the XFA specification to which the rich text string complies.
spec=revisionID
1058
28
Adobe Implementation
This appendix discusses details of the Adobe XFA implementation. This information is of interest both to those who wish to create XFA forms and those who wish to create an XFA processor. The Adobe implementation described here corresponds to the following products:
Adobe LiveCycle Designer ES version 8.1 Adobe Acrobat 8 Professional version 8.1 and 8.1.1 Adobe LiveCycle 8
Although these products were created to implement the XFA 2. 6 specification, Adobes implementation does not conform in every way to this specification. The section Non-conformance on page 1060 lists ways in which Adobes implementation is known to be non-conforming. This specification allows certain choices to be made by the implementer of the XFA processor. The section Implementation-specific behavior on page 1062 lists particular choices made by Adobe. Anyone who creates XFA forms should be aware that non-Adobe XFA processors may make different choices. Finally, an XFA template may contain a processing instruction which provides hints toXFA processors to maximize backward compatability. Some keywords for this processing instruction are applicable to XFA processors generally, and are formally part of the XFA standard. However Adobe also defines some implementation-specific keywords which will probably be ignored by non-AdobeXFA processors. Non-Adobe XFA processors may in turn define their own implementation-specific keywords. The complete set of keywords defined by this standard and/or used by Adobe products is described in Processing instruction for backward compatability on page 1071.
1059
Non-conformance
This section lists behaviors of Adobe products that deviate from the XFA specification.
Font metrics
Many Adobe products use a common text engine (AXTE) for laying out text. Starting with the XFA 2.2 generation (corresponding to Acrobat 7) Adobe products adopted this engine for laying out rich text from XFA forms. This engine includes heuristics based upon Adobes long experience with fonts in the field. For example, the line gap value in many installed fonts is unreliable, so the text engine ignores the font-supplied line gap and instead uses 20% of the font height. The behavior of the text engine, as it relates to XFA, is described in AXTE Line Positioning on page 1199.
on containers. Adobe products have always ignored these properties on containers. See Template Syntax on page 1226.
Implementation-specific behavior
This section lists behaviors of Adobe products that are allowed by the XFA specification but may differ from other conforming implementations.
XML 1.1
Adobe products do not implement XML 1.1. In consequence not all Unicode code points are supported. See Unicode Support on page 364.
JavaScript
Support for scripts written in FormCalc is required by this specification. Adobe products also support scripts written in JavaScript. See Selecting a Script Language on page 359.
Generator Tag
Applications that generate XFA forms may insert a generator identifier in an XML processing instruction (PI). For more information see The xfa Processing Instruction on page 887. Adobe LiveCycle Designer inserts a generator identifier of AdobeLiveCycleDesigner_VM.N where M.N represents the version number.
Image URIs
To protect the user, Acrobat requires any images that are supplied with a form to be included in the XDP or PDF that contains the form. Image references are resolved based on the images in the package. If a reference cannot be resolved in the package the image is not displayed. However image fields (fields with an image-picker UI type) allow the user to pick an image from some other place, for example from a file on disk. In this case Acrobat saves a copy of the image by value so it is rendered correctly. See Respecting External References in Image Data and Rich Text on page 473.
Locale
Acrobat ignores the locale property in the common portion of the Acrobat section of the Config DOM (page 146). This is by design because it makes no sense for the server to override the clients locale.
LocaleSet
Acrobat ignores the localeSet property in the common portion of the Acrobat section of the Config DOM (page 146). This is by design to prevent a possible avenue of attack using Acrobat to fetch private data by taking advantage of the users access privileges. The locale definition must be satisfied by a
combination of the information included with the form (including any locale set packets) and the knowledge of locales built into Acrobat. See Resolving Locale Properties on page 141.
Caution: Adobe products do not currently generate this markup. However Adobe will use this markup in future. All existing Adobe products ignore this markup.
Schemes in URIs
For properties which take URIs in their values, such as href and usehref, Adobe products pass the URI through to the OS and/or browser. Hence the set of supported schemes varies depending upon the platform.
Signature encoding
The encoding element in the template grammar specifies the type of signature encoding. The signature code inside this element is vendor-defined. For a list of the codes defined by Adobe see the description of the encoding element in the template syntax reference.
The syntax of the XFA processing instruction is described in The xfa Processing Instruction on page 887.
XMP packet
This standard permits XDP files to contain an XMP [XMPMeta] packet. XMP is used to hold data about the document which is not part of the document itself (also known as metadata). The XMP packet is not required and XFA processors do not rely upon its presence. On the other hand XMP is a standard format for metadata so programs that do not know anything about the XFA schema can read and use information in the XMP packet. LiveCycle Designer puts an XMP packet into the XDP. The main payload of this XMP packet is identification information which is described in Creation tool identification on page 1066, Author identification on page 1066, and Document identification on page 1067. In addition the XMP packet may optionally carry a fragment catalog which is described in Fragment catalog on page 1067. The example below shows an XDP file created by LiveCycle Designer. The file has been stripped down to just the XMP packet and those other parts of the file to which the XMP packet makes reference or from which it copies data. It does not include a fragment catalog.
Example 28.1 XMP packet and related information as emitted by LiveCycle Designer
<?xfa generator="AdobeLiveCycleDesignerES_V8.1" APIVersion="2.6.7185.0"?> <xdp:xdp xmlns:xdp="http://ns.adobe.com/xdp/" timeStamp="2007-07-20T21:05:10Z" uuid="5c302b76-3043-456d-a8ef-6c571387782c"> <template xmlns="http://www.xfa.org/schema/xfa-template/2.6/"> <subform > <desc> <text name="version">8.1.1.2188.1.406459.359820</text> <text name="contact">Joseph M. Fiddlehead</text> <text name="department">Department of Deportment</text> </desc> </subform> </template> <xmp:xmpmeta xmlns:xmp="adobe:ns:meta/" xmp:xmptk="Adobe XMP Core 4.0-c319 44.281645, Sun Mar 25 2007 16:17:34"> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"> <rdf:Description xmlns:xap="http://ns.adobe.com/xap/1.0/" rdf:about=""> <xap:MetadataDate>2007-07-20T20:22:36Z</xap:MetadataDate> <xap:CreatorTool>Adobe LiveCycle Designer ES 8.1</xap:CreatorTool> </rdf:Description> <rdf:Description xmlns:pdf="http://ns.adobe.com/pdf/1.3/" rdf:about=""> <pdf:Producer>Adobe LiveCycle Designer ES 8.1</pdf:Producer> </rdf:Description> <rdf:Description xmlns:xapMM="http://ns.adobe.com/xap/1.0/mm/" rdf:about=""> <xapMM:DocumentID> uuid:27364638-70c3-44e2-8df4-206026612a01 </xapMM:DocumentID> </rdf:Description> <rdf:Description xmlns:desc="http://ns.adobe.com/xfa/promoted-desc/" rdf:about="">
<desc:version rdf:parseType="Resource"> <rdf:value>8.0.1291.1.339988.308172</rdf:value> <desc:ref>/template/subform[1]</desc:ref> </desc:version> </rdf:Description> <desc:contact rdf:parseType="Resource"> <rdf:value>Joseph M. Fiddlehead</rdf:value> <desc:ref>/template/subform[1]</desc:ref> </desc:contact> <desc:department rdf:parseType="Resource"> <rdf:value>Department of Deportment</rdf:value> <desc:ref>/template/subform[1]</desc:ref> </desc:department> </rdf:RDF> </xmp:xmpmeta> </xdp:xdp>
It also records a build identifier in the desc:version field. For backwards compatability it also copies the same information into a desc element inside the template. In Dublin Core style the desc:version field is defined as follows:
http://ns.adobe.com/xfa/promoted-desc/ desc:version = "..." desc: (0x80000000 : schema)
In addition to the value LiveCycle Designer also includes a desc:ref field which contains an [XPATH] expression pointing to the parent of the associated desc element in the template.
Author identification
As shown in XMP packet and related information as emitted by LiveCycle Designer on page 1065, LiveCycle Designer records the authors name in the desc:contact field. For backwards compatability It also copies this information into a desc element which is a child of the template element that encloses the template packet. Similarly LiveCycle Designer records the authors department in the desc:department field. For backwards compatability It also copies this information into a desc element inside the template. In Dublic Core style these fields are defined as follows.
desc:
(0x80000000 : schema)
For each of these fields, in addition to the value LiveCycle Designer also includes a desc:ref field which contains an [XPATH] expression pointing to the parent of the associated desc element in the template.
Document identification
XFA forms packaged as XDP files have a Universally Unique Identifier (UUID) as the value of the uuid attribute on the XDP root element. As shown in XMP packet and related information as emitted by LiveCycle Designer on page 1065, LiveCycle Designer prepends the string uuid: and copies the result into the xapMM:DocumentID field. If the XFA form is packaged as a PDF file then the copy in the XMP packet is the only copy of the UUID. In Dublin Core style this field is defined as follows.
http://ns.adobe.com/xap/1.0/mm/ xmpMM:DocumentID = "..." xmpMM: (0x80000000 : schema)
LiveCycle Designer records the time and date at which the form was created in the xap:MetadataDate field in [ISO-8601] format. This is the same value it records in the timeStamp attribute of the XDP element. In Dublin Core style this field is defines as follows.
http://ns.adobe.com/xap/1.0/ xap:MetadataDate = "..." xap: (0x80000000 : schema)
If a form is subsequently loaded into LiveCycle Designer and updated these document identification strings do not change.
Fragment catalog
XFA templates residing in XDP files can import fragments by reference from other templates. (This is not allowed for XFA templates inside PDF files because PDF files are required to be self-contained.) XFA does not require that fragments be specially marked or declared. However, it is often convenient for form authors to be able to nominate fragments that are intended for incorporation elsewhere. The fragment catalog provides a place to catalog such fragments. Because the catalog is XMP-based it can easily be read and used by multiple applications. Because the fragment catalog is metadata, form design tools may not rely upon either its presence or its correctness. In particular it is not guaranteed to be in sync with the template. It may lists fragments that no longer exist. The fragment catalog is expressed as a property named fragmentCatalog. This property is defined in the namespace http://ns.adobe.com/livecycle/designer/. A prefix of lcd is suggested for representing this namespace.
The fragmentCatalog property describes an array of fragments defined in the XFA template packet. The order of entities in the array is significant. For each defined fragment, there is an entry in the ordered array. Definition for lcd:fragmentCatalog Property
lcd:fragmentCatalog
Category Internal
Description An ordered arrayof fragments which are defined within the template.
Each entry in the array is a structure which stores information about the fragment definition. The information about the fragment definition is stored as a set of fields. Some fields use the Dublin Core namespace http://purl.org/dc/element/1.1/ while others use the LiveCycle Designer namespace http://ns.adobe.com/livecycle/designer/. The preferred field namespace abbreviation is dc for Dublin Core and lcd for LiveCycle Designer. Definition for fragment FieldName
dc:title dc:description
Description The fragments UI name (distinct from any XFA name). The fragments UI description. This is used to communicate intented use of the fragment to anyone referencing the fragment. A fully-qualified XFA-SOM expression identifying the fragment within the template. A keword identifying the context in which the fragment is intended to be used. One of Subform, ScriptObject, Table, TableBodyRow, TableHeader, or TableFooter.
dc:identifier lcd:fragmentRole
A portion of an XMP packet containing a fragment catalogue is shown below. For brevity only English-language dc:title and dc:description fields are shown, but there could be many such fields for each fragment defining titles and descriptions in other languages.
<rdf:li xml:lang="x-default">Fragment used to create a standard header.</rdf:li> </rdf:Alt> </dc:description> <dc:identifier> $template.#subform.MyHeaderFragment </dc:identifier> <lcd:fragmentRole>Subform</lcd:fragmentRole> </rdf:li> <rdf:li rdf:parseType="Resource"> <dc:title> <rdf:Alt> <rdf:li xml:lang="x-default">My Footer Fragment</rdf:li> </rdf:Alt> </dc:title> <dc:description> <rdf:Alt> <rdf:li xml:lang="x-default">Fragment used to create a standard footer.</rdf:li> </rdf:Alt> </dc:description> <dc:identifier> $template.#subform.MyFooterFragment </dc:identifier <lcd:fragmentRole>Subform</lcd:fragmentRole> </rdf:li> </rdf:Seq> </lcd:fragmentCatalog> </rdf:Description> </rdf:RDF> </x:xmpmeta>
If the form author has nominated form fragments for the catalog, LiveCycle Designer includes a fragment catalog in the form. It does so regardless of whether the form is packaged in an XDP file or in a PDF file. The fragment catalog has no immediate use inside a PDF file but the information is preserved in case the form is later converted from PDF format to XDP format.
Config packet
The Adobe-specific portion of the config grammar is documented in Adobe Config Syntax Reference on page 1074.
specified by earlier versions of the specification and since changed; left unspecified or ambiguous by earlier versions of the specification and since clarified; defective behavior (contrary to the specification) exhibited by a particular earlier XFA processor and since corrected; legal behavior by a particular XFA processor that has changed but is nonetheless still legal.
The processing instruction, if present, is a child of the template element which contains the packet. It is recommended that it be the first child in document order. The processing instruction has the following syntax:
<?originalXFAVersion http://www.xfa.org/schema/xfa-template/2.x/ [flags] ?>
where 2.x identifies the version of the XFA specification for which the template was originally created.
flags represents one or more parameters in the form name:value. When more than one flag is present they must be separated by whitespace. Any flags not recognized by the XFA processor are ignored. The flags listed below are understood by some versions of the Adobe XFA processor.
Caution: Contrary to the usual practice for XFA names, some flag names use upper case for the first character.
original XFA-Template version is 2.4 or later, or if this flag is given as LegacyEventModel:0, the XFA processor uses the newer event model.
Leading was applied to the first (or only) line of all text blocks, causing top-aligned text to appear pushed down from the top border. Font metrics were used to determine leading, resulting in text lines too close together or too spread out, depending on the font. (This occurred only with fonts that reported incorrect metrics, but fonts often do.) Hidden borders influenced text positioning, generally causing text to shift away from the bounding box of its container. Line spacing did not allow for different ascent/descent ratios on font changes, typically resulting in text being pushed up when the line contained a font change. Fonts with an ascent/descent combination greater than the font height were not handled properly, causing text to be pushed up when such a font was encountered. (This occurred only with fonts reporting incorrect metrics.) The wrong font was sometimes used at a paragraph break, typically causing the last line of the paragraph to be pushed down. Baseline shifts could lead to unnecessary space being added after a line with a down-shift. Also, there were slight differences in handling of metrics for up-shifts. With some fonts, upper-case accented letters could spill out of the top of the text area. (This occurred only with fonts reporting incorrect metrics.) Vertical font metric values were truncated to a more limited accuracy, causing imperceptible printing differences but confusing automated differencing tools.
Line-spacing could change at the span level, leading to unpredictable spacing in word-wrapped lines. Span elements are no longer allowed to change the line spacing in the middle of a paragraph.
Inaccurate use of character widths could lead to underestimated line widths and possibly result in wrapping errors. Justified text leading up to a forced line break was not properly justified. Line breaking opportunities were missed. Now [UAX-14] line breaking rules are used. A line break took place prematurely after a tab to the end of line. Now the line break only takes place if non-blank text follows the tab. Unresolved characters appeared as 10 point spaces. Now they appear as question marks.
For any text object using the old text positioning algorithms, a combination of these issues could apply, either compounding the effect, or canceling each other out.
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The agent element is used within the following other elements: config
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The area element is used within the following other elements: trace NOTE: Trace messages are intended for use internally by Adobe. They are not localized and are not generally comprehensible without access to the source code. This option is documented here in order to assist customers who are in contact with Adobe support.
Do not generate any trace messages for this subsection. This is the default for all subsections, so if there is no area element supplied for a particular subsection it does not generate any trace messages.
1
Generate all trace messages, no matter how trivial, for this subsection.
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barcode
Traces overall process flow in LiveCycle products. Acrobat does not generate these messages.
layout
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XFA Specification Chapter 29, Adobe Config Syntax Reference Config General Reference 1079
The trace element is used within the following other elements: config
XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for Acrobat 1080
The acrobat element is used within the following other elements: config Acrobat 6 retrieved its configuration settings from an agent element with a name attribute carrying the value acrobat. Newer versions use an acrobat element instead. For backwards compatability if this element is missing Acrobat falls back on the old agent syntax.
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The acrobat7 element is used within the following other elements: acrobat The legacy flags within this element force Acrobat version 7 and later to continue behaving like Acrobat 6 in certain ways. Note that a new syntax for declaring legacy flags was introduced in a later version of XFA. Newer legacy flags are expressed within the template (not config) using the originalXFAVersion processing instruction. However, the flags defined under acrobat7 are still part of the config grammar and are still supported by Acrobat.
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The dynamicRender element is used within the following other elements: acrobat7 Acrobat 6 could update the content of fields as they were modified but it could not resize a field, add new pages or fields, show content which had been hidden or hide content which had been shown. This flag forces newer versions of Acrobat to behave the same way as Acrobat 6.
Content
The content must be one of the following:
forbidden
Do not re-render. This setting is appropriate for XFAF forms. It is also appropriate for old-style static forms.
required
Perform re-rendering whenever necessary. Note that this is not the default so dynamic forms must explicitly set this flag in order to work properly. Setting this flag introduces some additional processing overhead even when re-rendering does not take place.
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The accessibleContent element is used within the following other elements: permissions Accessibility aids such as screen readers need to copy text from the document into their own buffers. This option sets a permission flag which controls the ability of programs which identify themselves as accessibility aids to extract text or graphics from the document. Once extracted, the data may be used for any purpose. This permission flag applies only when an encrypted PDF document is opened using the user password. There are no restrictions if the document is unencrypted or it is opened using the master password. This option corresponds to bit 10 in table 3.20 ("User access permissions") of [PDF].
Content
The content must be one of the following:
0
XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1084
The addSilentPrint element is used within the following other elements: silentPrint
Content
The content must be one of the following:
0
Do not invoke a print dialog on open. The user can still invoke the normal print dialog via the menu.
1
Open a print dialog on open. The print job will not be submitted until the user approves it by some action such as clicking on a button.
XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1085
The addViewerPreferences element is used within the following other elements: viewerPreferences
Content
The content must be one of the following:
0
Do not include the viewer preferences. The viewer program will use its own defaults.
1
Include the viewer preferences. These are just defaults which the user can override.
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The alwaysEmbed element is used within the following other elements: fontInfo This option overrides the embed element for the font it names, forcing it to be embedded in the output document whenever possible. One use of this is for a specialized font that is not likely to be present in the client or printer. Another use is for a font containing only the Euro symbol, which is not included in many fonts that were defined before the Euro was introduced. It is not always possible to embed a font in the document. Some page description languages do not support embedding, or only support some types of fonts. In addition particular fonts may have license restrictions which bar embedding.
Content
The content must be a font name. Any whitespace in the element content is presumed to be part of the font name, including leading and trailing whitespace. No normalization is performed, so for example a space character is not equivalent to a tab character and upper-case letters are distinct from lower-case letters.
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The amd element is used within the following other elements: pdfa
Content
As specified in [ISO-19005-1], the content of this element "shall be the amendment number and year, separated by a colon" (paragraph 6.7.10). An empty element, which is the default, signifies the original unamended specification.
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The batchOutput element is used within the following other elements: pcl pdf ps zpl Normally an XFA processor produces a single output document containing all of the data which it has merged into the form. However in batch mode it produces a separate document for each input record. The collection of separate documents is packaged within a single output file.
Batching is enabled. Each record generates a separate document. The collection of documents is packaged as a standard zip file (without any compression).
zipCompress
Batching is enabled. Each record generates a separate document. The collection of documents is packaged as a compressed zip file.
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The cache element is used within the following other elements: present
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The change element is used within the following other elements: permissions The permisson bit controlled by this option grants the user permission to modify the contents of the document by any means not controlled by the modifyAnnots element, the formFieldFilling element, or the documentAssembly element. For example, this option controls the user's ability to edit the boilerplate.
Content
The content must be one of the following:
0
Disallow changes.
1
Allow changes.
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The compress element is used within the following other elements: ps Some PostScript printers allow compression of images or the entire document. However different printers support different compression algorithms. The print driver is required to know what compression algorithm(s) can be used with the particular printer.
Only images are compressed. For each image the driver picks a compression method that is efficient for binary data. After compression the data is encoded as printable characters.
document
The entire document is compressed. The driver picks a single compression method for the whole document that is efficient for textual data.
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The compressLogicalStructure element is used within the following other elements: compression Logical structure data is ancillary information about the document, beyond the visible appearance. For example it includes hints for screen readers. This information can be quite bulky. Logical structure is described in section 10.6 of [PDF].
Content
The content must be one of the following:
0
Compress the logical structure data. Doing so consumes additional processing time.
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The compression element is used within the following other elements: pdf
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The conformance element is used within the following other elements: pdfa
Content
The PDF/A-1 specification [ISO-19005-1] defines two levels of conformance, PDF/A-1A and PDF/A-1B. The content must be one of the following:
A
Conformance to PDF/A-1A.
B
Conformance to PDF/A-1B.
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The contentCopy element is used within the following other elements: permissions This permission flag enables or disables the ability to copy or otherwise extract text or graphics from the document. Note that, for older PDF client software, disabling copying also disables accessibility aids such as screen readers. Newer PDF client software (implementing PDF 1.4 or later) understands a separate permission flag for accessibility aids. That flag is controlled by the accessibleContent element. This permission flag applies only when an encrypted PDF document is opened using the user password. There are no restrictions if the document is unencrypted or it is opened using the master password. This option corresponds to bit 5 in table 3.20 ("User access permissions") of [PDF].
Content
The content must be one of the following:
0
Disallow copying.
1
Allow copying.
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The copies element is used within the following other elements: present This option is used by Presentation Agent when producing an output document. It is ignored if the destination element contains pdf. Otherwise it is incorporated into the output document as a directive.
Content
The content must be a positive integer. The default is 1.
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The creator element is used within the following other elements: pdf PDF documents can identify the document creator via the Creator entry in the Document Information dictionary. This dictionary is described in table 10.2 of [PDF]. XFA processors duplicate this string in the XMP metadata packet.
Content
The content is a string identifying the program or application that created the template. The string may contain whitespace. If the supplied element is omitted or empty the existing value is preserved.
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The currentPage element is used within the following other elements: script At the start of processing the application copies this value into xfa.host.currentPage. Scripts may subsequently alter the value.
Content
The content must be a non-negative integer. The default is 0.
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The debug element is used within the following other elements: xsl If the uri element contained within the debug element is empty or absent the XFA application must not save the preprocessed document. Hence the temp file containing the preprocessed document, if any, must be deleted. However if the uri element contained with the debug element is non-empty the XFA application must, upon exiting, leave behind an XML document at the specified URI containing the output of the preprocess phase. This option takes effect during the data-load phase if it is contained in data, in the template-load phase if it is contained in template, and in the rendering phase if it is contained in xdc. For more information about this element, see XSLT Transformations.
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The defaultTypeface element is used within the following other elements: fontInfo Different installations have different fonts available. Different platforms have different fallback policies. This option specifies a uniform fallback font across all platforms and installations. This element is deprecated. Newer implementations should use the content of the typefaces element in the locale set.
Content
The content is the typeface name for the font. Any whitespace in the element content is presumed to be part of the typeface name, including leading and trailing whitespace. No normalization is performed, so for example a space character is not equivalent to a tab character and upper-case letters are distinct from lower-case letters. When there is no defaultTypeface element supplied, or there is none that applies to the current locale, the application falls back onto "Courier Std". This font ships with LiveCycle.
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Use the font as the default for locales which are not explicitly matched by any other defaultTypeface element.
Arabic
XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1102
When contained by an openAction element this option specifies the action to be performed upon opening the document in an interactive client.
<destination Properties: desc="cdata" lock="0 | 1" > ...pcdata... </destination>
The destination element is used within the following other elements: openAction present
Content
When containted by a present element, the content specifies the output format as follows:
pdf
The output format is [PDF]. The pdf element contains PDF-specific options. PDF may be used either for interactive clients such as Acrobat or for printing.
pcl
The output format is [PCL]. The pcl element contains PCL-specific options. PCL is used for printing.
ps
The output format is [PostScript]. The ps element contains PostScript-specific options. PostScript is used for printing.
webClient
The output format is HTML. The webClient element contains HTML-specific options.The HTML may incorporate CSS, JavaScript and other extensions and may vary from one client to another. Interactivity is expected, but not necessarily support for every XFA feature.
zpl
The output format is [ZPL]. The zpl element contains ZPL-specific options. ZPL is used for printing. When contained by an openAction element, the content specifies the action to be performed upon opening the document in an interactive client. If it contains pageFit the document is resized to fit the window. If the element is empty or omitted or contains some other value the default action is taken.
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XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1104
The documentAssembly element is used within the following other elements: permissions This options controls whether the user has the right to insert, delete, or rotate pages, and create navigation elements such as bookmarks and thumbnail images. If permission is granted the user has these rights, even if modification of the document is otherwise forbidden by the setting of the change element. This permission flag applies only when an encrypted PDF document is opened using the user password. There are no restrictions if the document is unencrypted or it is opened using the master password. This option corresponds to bit 11 in table 3.20 ("User access permissions") of [PDF].
Content
The content must be one of the following:
0
XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1105
The driver element is used within the following other elements: present Adobe supplies drivers for the most popular page description languages such as PDF, PDF/A, PCL, and ZPL. However custom drivers may also be used. This element supplies the driver with additional information.
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The duplexOption element is used within the following other elements: viewerPreferences
Content
This value corresponds to the Duplex option in the viewer preferences dictionary. The Duplex option is described in table 8.1 in section 8.1 of [PDF]. The content must be one of the following:
simplex
XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1107
The embed element is used within the following other elements: fontInfo This option controls whether fonts used in the document are embedded in the document, when possible. If the fonts are not embedded the client computer or printer may not be able to reproduce the text properly. On the other hand fonts take a relatively large amount of data. It is not always possible to embed a font in the document. Some page description languages do not support embedding, or only support some types of fonts. In addition particular fonts may have license restrictions which bar embedding. When this option is set to disable embedding of fonts, it may be overriden for specific fonts by the alwaysEmbed element.
Content
The content must be one of the following:
0
Do not embed the fonts in the output document, except where overridden by the alwaysEmbed element.
1
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The encrypt element is used within the following other elements: encryption Encryption of PDF documents is described in section 3.5 of [PDF]. The algorithm used is RC4 as described in section 3.5.1 of [PDF].
Content
The content must be one of the following:
0
Do not encrypt.
1
Encrypt.
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The encryption element is used within the following other elements: pdf The document author can impose restrictions upon the use of a PDF document, such as allowing fields to be filled in but no other changes to be made. In order to enforce this the document is encrypted. PDF viewers know how to decrypt PDF documents, however they also enforce the restrictions imposed by the permissions declared within this element.
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The encryptionLevel element is used within the following other elements: encryption Encryption of PDF documents is described in section 3.5 of [PDF]. The algorithm used is RC4 as described in section 3.5.1 of [PDF] .
Content
The content must be one of the following:
40bit
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The equate element is used within the following other elements: map This option is commonly used to deal with typefaces specified in the device control information that are not available on the printer or display device. For example, the following syntax:
<equate from="Arial_normal_normal", to="Arial_bold_italic">
changes the font for text that is specified as plain Arial to bold italicized Arial in the generated output.
Perform the substitution only for characters that are missing from the from font.
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The to property
This attribute supplies the name of the substitute typeface.
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The exclude element is used within the following other elements: script Scripts are normally invoked by events. Some events are generated only by a user interface and thus cannot occur in a non-interactive context such as a form server. However other events can occur. This option controls which of those events are allowed to occur.
Content
The content must be a space-separated list of zero or more of the following:
calculate
Exclude validate events. Validation scripts will not be triggered. The default is an empty list, which enables all events.
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XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1115
The flipLabel element is used within the following other elements: zpl To flip a label is to print its content rotated by 180 degrees around the geometric center of the label.
Content
The content must be one of the following:
usePrinterSetting
This value causes the label content to rotate 180 degrees, regardless of the printer setting.
off
This value causes the label content to print without rotation, regardless of the printer setting.
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The fontInfo element is used within the following other elements: driver pcl pdf ps webClient zpl
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XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1118
The formFieldFilling element is used within the following other elements: permissions This option sets a permission bit which controls the user's ability to fill in form fields, including signature fields. If permission is granted the user can fill in fields regardless of the content of the modifyAnnots element. This permission flag applies only when an encrypted PDF document is opened using the user password. There are no restrictions if the document is unencrypted or it is opened using the master password. This option corresponds to bit 9 in table 3.20 ("User access permissions") of [PDF].
Content
The content must be one of the following:
0
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The includeXDPContent element is used within the following other elements: pdfa The specified packet(s), without any XDP container, is/are placed in the generated PDF under the XFAResources Names dictionary. This is purely supplementary information, not a "live" part of the document.
Content
In XFA 2.6 the content of this element must be either an empty string (signifying no packets), which is the default, or the value datasets which causes the dataSets packet to be attached to the document.
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The incrementalMerge element is used within the following other elements: present
Content
The content must be one of the following:
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The interactive element is used within the following other elements: pdf There are two distinct ways to use a PDF document. One is to print it out, employing PDF as a page description language. The other is to use client software with a user interface that allows interaction with the document. The content of this element indicates which way the output document will be used.
Content
The content must be one of the following:
0
The form will be printed for filling out off-line with a pen or pencil. Interactive user interface objects, such as fields and radio buttons, are rendered as boilerplate and the annotation layer is left empty.
1
The form will be filled out on-line using a suitable client program. Interactive user interface objects are placed into the annotation layer.
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The jog element is used within the following other elements: pcl ps Many printers provide a facility to make it easy to separate different sets of pages in the output tray by shifting alternate sets slightly to one side or the other. This option controls that behavior.
Content
The content must be one of the following:
usePrinterSetting
Causes the paper to jog between page sets within the XFA print job.
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The layout element is used within the following other elements: present
Content
The content must be one of the following:
paginate
This is normally used when the output is going to a printer or a PDF client such as Acrobat. As containers grow they overflow from one page to the next. The output document includes all pages.
panel
This is normally used when the output is going to an HTML browser. Containers can grow to any size without overflowing the page. The output document includes only the content corresponding to xfa.host.currentPage.
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The level element is used within the following other elements: compression Most of a PDF document can be packaged internally into streams. Streams can be compressed. Other (non-streamed) portions of the document cannot be compressed.
Content
The content must be one of the following:
0
Disables compression.
integer
Enables compression. The integer must be greater than zero. The value makes no difference to the compression.
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The linearized element is used within the following other elements: pdf Linearized PDF is reorganized to optimize performance when the document is being viewed across a network. For more information see appendix F "Linearized PDF" of [PDF].
Content
The content must be one of the following:
0
Do not linearize.
1
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The map element is used within the following other elements: fontInfo mediumInfo This option is commonly used to deal with typefaces specified in the device control information that are not available on the printer or display device.
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The mediumInfo element is used within the following other elements: pcl ps Medium types are defined in the device control file (XDC). The medium type can specify not only the paper specification (and therefore input tray) but also the output tray and output treatment.
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The modifyAnnots element is used within the following other elements: permissions The permission bit set by this option grants the user the ability to add or modify text annotations and, if the change element grants permission, to create or modify interactive form fields (including signature fields). This option can also grant the user the ability to fill in existing fields of a form, but that permission can also be granted independently by the formFieldFilling element. This permission flag applies only when an encrypted PDF document is opened using the user password. There are no restrictions if the document is unencrypted or it is opened using the master password. This option corresponds to bit 6 in table 3.20 ("User access permissions") of [PDF].
Content
The content must be one of the following:
0
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The neverEmbed element is used within the following other elements: fontInfo This option overrides the embed element for the font it names, forcing it not to be embedded in the output document. This is used for a font that is known to be present in the client or printer.
Content
The content must be a font name. Any whitespace in the element content is presumed to be part of the font name, including leading and trailing whitespace. No normalization is performed, so for example a space character is not equivalent to a tab character and upper-case letters are distinct from lower-case letters.
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The numberOfCopies element is used within the following other elements: viewerPreferences
Content
This value corresponds to the NumCopies option in the viewer preferences dictionary. The NumCopies option is described in table 8.1 in section 8.1 of [PDF]. The content must be an integer in the range 2 through 5, inclusive. There is no default. When this element is omitted the NumCopies option is not set and the viewer defaults to a single copy.
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The openAction element is used within the following other elements: pdf
When contained by an openAction element this option specifies the action to be performed upon opening the document in an interactive client.
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The output element is used within the following other elements: present The output element must contain a to element. If the to element contains uri there must also be a uri element containing the URI.
The to property
This option controls the location where either Presentation Agent will place either the log data or its output data.
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The outputBin element is used within the following other elements: pcl ps
Content
The content is inserted verbatim into the print stream. Consequently the content must conform to the page description language (PCL or PDF) corresponding to its containing element. When this element is enclosed within a pcl element, the content of this element is a non-negative integer which is inserted into a PCL output tray select command. When this element is enclosed within a ps element, the content of this element is a string which is passed as the value of a PostScript OutputTray parameter. This parameter is described in table 6.5 of the PostScript reference, [PostScript]. Note that the mapping from the content to the physical bin is specific to the individual printer. It may even change when the printer is reconfigured. When this element is empty or omitted the output bin selection is left up to the printer.
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The overprint element is used within the following other elements: present This option is only used when printing. When generating PDF this option is ignored unless the interactive property in the pdf section is set to 0.
Content
The content must be one of the following:
none
Forbids overprinting. The renderer clips all content at container boundaries. This is the default.
both
Both field and draw content is allowed to print beyond container boundaries. No clipping is done.
draw
Draw content is allowed to print beyond the draw boundaries. Field content is clipped.
field
Field content is allowed to print beyond the field boundaries. Draw content is clipped.
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The packets element is used within the following other elements: xdp An XDP contains subsections called packets. This option controls which packets are included in the XDP. Each packet is enclosed within an element which is a second-level node, that is, a child of the xdp element. The packets are identified by the name in the start tag of the enclosing element. Some packets are defined as part of XFA - the template and data packets, for example. There may be custom packets in an XDP, that is, packets not defined in XFA. When an XDP containing custom packets is loaded, for each custom packet a corresponding placeholder node is created under the root xfa node. These placeholder nodes are accessible to scripts, but they have no content or children in the XFA DOM. However the full custom packet content is preserved in the associated XML DOM. The name of the custom packet node is copied from the packet's enclosing element. When the packet element is empty, missing, or contains *, all XFA packets and custom packets are included in the output XDP. This option has effect only when the content of destination is xdp.
Content
The content must be * or a list of packet element names separated by white space. The following packet element names correspond to XFA DOMs:
config
XFA configuration information (i.e. the options described in this present specification).
datasets
Annotations.
xslt
An XSLT stylesheet for transforming data before it is loaded into the XFA Data DOM.
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XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1137
The pageOffset element is used within the following other elements: pcl Using this element the printed region can be shifted away from the default location. This is commonly used with pre-printed stock. The printed region may be shifted right or left, up or down, provided that printable content of the form remains within the printable region of the page.
The x property
The amount to shift the origin in the horizontal direction. The value must be either the string useXDCSetting (which is the default) or a measurement. The value useXDCSetting causes the XFA processor to use the default X offset provided by the device driver. When a measurement is supplied it is used as the X offset. A positive measurement shifts the content to the right. A negative measurement shifts the content to the left.
The y property
The amount to shift the origin in the vertical direction. The value must be either the string useXDCSetting (which is the default) or a measurement. The value useXDCSetting causes the XFA processor to use the default Y offset provided by the device driver. When a measurement is supplied it is used as the Y offset. A positive measurement shifts the content down the page. A negative measurement shifts the content up the page.
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The pageRange element is used within the following other elements: viewerPreferences This option corresponds to the PrintPageRange option in the viewer preferences dictionary. The PrintPageRange option is described in table 8.1 in section 8.1 of [PDF].
Content
The content must be a space-separated list of positive integer page numbers and there must be an even number of page numbers in the list. Each successive pair of page numbers specifies a page range which is inclusive. For example, the range "5 10" means pages 5, 6, 7, 8, 9, and 10. When this element is omitted or empty PrintPageRange is omitted from the preferences dictionary. When printing the viewer defaults to all pages.
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The pagination element is used within the following other elements: present There are three cascading levels of simplex/duplex control. The highest level is the device control document (XDC) which specifies the printer capabilities. The next level is the job level which is controlled by this very option. Finally the form template may specify different page layouts for different simplex/duplex settings.
Content
The content must be one of the following:
simplex
If the printer is capable of duplex printing the form is printed using both sides of the paper. The second side of each sheet is reached by flipping the sheet in the axis of the short edge.
duplexLongEdge
If the printer is capable of duplex printing the form is printed using both sides of the paper. The second side of each sheet is reached by flipping the sheet in the axis of the long edge.
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The part element is used within the following other elements: pdfa
Content
Currently the only legal value is 1, corresponding to PDF/A-1 [ISO-19005-1]. This is also the default value.
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The pcl element is used within the following other elements: present This element is only used when the content of destination is pcl.
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The pdf element is used within the following other elements: present This element is only used when the content of destination is pdf.
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The pdfa element is used within the following other elements: pdf
XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1147
The permissions element is used within the following other elements: encryption Permissions are described in section 3.5.2 of [PDF].
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XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1149
The plaintextMetadata element is used within the following other elements: permissions Document metadata is represented by an XML stream contained within the output PDF document. However if the document is encrypted, the metadata is also by default encrypted. When asserted this option causes the metadata stream to be unencrypted even if the rest of the document is encrypted, thus making the metadata available to unprivileged applications. The metadata stream is discussed in section 10.2.2 of [PDF].
Content
The content must be one of the following:
0
Do not encrypt the metadata even if the rest of the document is encrypted.
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The present element is used within the following other elements: config
When contained by an openAction element this option specifies the action to be performed upon opening the document in an interactive client.
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The ps property
This element contains options that apply specifically to PostScript output files.
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XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1153
The print element is used within the following other elements: permissions The permission bit set by this option controls whether the user is able to produce a hard copy of the document. The printed copy may be degraded in appearance compared to the original, depending upon the content of the printHighQuality element. This permission flag applies only when an encrypted PDF document is opened using the user password. There are no restrictions if the document is unencrypted or it is opened using the master password. This option corresponds to bit 3 in table 3.20 ("User access permissions") of [PDF].
Content
The content must be one of the following:
0
Disallow printing.
1
Allow printing.
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The printHighQuality element is used within the following other elements: permissions The permission bit set by this option controls whether the user is able to produce a print file with as much detail as the original document. The print file is a faithful digital copy of the original document, hence could be used to spoof the original. This permission flag applies only when an encrypted PDF document is opened using the user password. There are no restrictions if the document is unencrypted or it is opened using the master password. This option corresponds to bit 12 in table 3.20 ("User access permissions") of [PDF].
Content
The content must be one of the following:
0
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The printerName element is used within the following other elements: silentPrint When the addSilentPrint option is enabled a print dialog is presented upon opening the document. This option names the default printer for that print job.
Content
The content of this option is the name of a printer in the form that the operating system requires. There is no default in the usual XFA sense. If this element is missing or empty the dialog diplays the ambient default printer.
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The producer element is used within the following other elements: pdf PDF documents can identify the document producer via the Producer entry in the Document Information dictionary. This dictionary is described in table 10.2 of [PDF]. XFA processors duplicate this string in the XMP metadata packet.
Content
The content is a string identifying the program or application that filled and rendered the form. The string may contain whitespace. If the supplied element is omitted or empty the existing value is preserved.
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The ps element
This element contains options that apply specifically to PostScript output files.
<ps Properties: desc="cdata" lock="0 | 1" name="cdata" > <batchOutput/> [0..1] <compress/> [0..1] <fontInfo/> [0..1] <jog/> [0..1] <mediumInfo/> [0..1] <outputBin/> [0..1] <staple/> [0..1] <xdc/> [0..1] </ps>
The ps element is used within the following other elements: present This element is only used when the content of destination is ps.
XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1158
XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1159
The renderPolicy element is used within the following other elements: pdf Clients that process dynamic forms necessarily have the ability to generate page content from the XFA content. Therefore when creating a PDF file containing a dynamic form it is not necessary to include any PDF page content in the PDF file. Instead the PDF file may contain just the XFA content and a shell of PDF markup surrounding it. This is called a shell PDF file. The PDF specification defines a NeedsRendering flag in the the catalog dictionary (document catalog) which controls whether PDF viewers attempt to regenerate the page content when the document is opened. For a shell PDF file this flag is true.
Content
The content must be one of the following:
server
Page content is generated on the server. An ordinary PDF file is produced. This value may be used with any kind of form.
client
No page content is generated on the server. A shell PDF file is produced. This value must only be used with a dynamic form.
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The runScripts element is used within the following other elements: script Scripts can be labelled with the runAt attribute as runnable at the client, at the server, or at both. The XFA application uses the content of the runScript element to tell it whether it is to execute only client scripts, only server scripts, or all scripts. In effect runScript tells it whether to behave like a server, like a client, or like a standalone application. When a client encounters a script marked to run at the server, it submits a request to the server to run the script and return the result. The submit target is controlled by the submitUrl option and the format of the request is controlled by the submitFormat option. Assuming the request is processed successfully, after the client receives the result it merges the received data into the form.
Content
The content must be one of the following:
both
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The script element is used within the following other elements: present
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The scriptModel element is used within the following other elements: pdf PDF is an extendible format which is capable of carrying XFA information embedded in the document. This embedded information is simply ignored by non-XFA PDF clients. However, it does make the file bigger. This option is provided as a way to produce plain PDF without any XFA content.
Content
The content must be one of the following:
XFA
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The silentPrint element is used within the following other elements: pdf This facility can be used to present a print dialog to the user upon opening the document. The print job is not submitted until the user approves printing by taking some action such as clicking on a button.
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The staple element is used within the following other elements: pcl ps
The print job is stapled, regardless of the printer setting. The location and number of staples is determined by the printer driver and device control document (XDC). If multiple copies are printed each copy is stapled individually.
off
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The submitFormat element is used within the following other elements: pdf This option applies only to interactive PDF output documents. The content of this element determines the settings for bits 3 (ExportFormat, 9 (SubmitPDF), and 6 (XFDF) in the submit-form action as described in table 8.86 ("Flags for submit-form actions") of [PDF].
Content
The content must be one of the following:
html
The format will be determined by the server and client at run time. The result is implementation-defined.
fdf
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The submitUrl element is used within the following other elements: present This is the submit target for running a script on the server when required by the script's runAt property. It is also the default target used by template submit elements that do not specify a target.
Content
The content must be a valid URL to which the eventual client may submit the form data.
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The subsetBelow element is used within the following other elements: fontInfo Sometimes a font is used only for a few characters in a document. It is wasteful to embed the entire font if only a portion of it is used. This options sets a usage threshold below which only the used subset is to be embedded. Above the threshold the entire font is to be embedded, if possible. This option does not apply to fonts that are not embedded. Embedding is controlled by the embed and alwaysEmbed elements. This option has no effect for fonts that are used in data-entry fields. If the font is embedded at all, it is embedded in its entirety.
Content
The content must be a positive integer from 0 to 100, inclusive. The default value for this option is 100, which causes all embedded fonts that are not used in data-entry fields to be subsetted.
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The tagged element is used within the following other elements: pdf Tags, in the context of PDF, are additional information included in a document to expose the logical structure of the document. Tags assist accessibility aids and reformatting. For example a page number may be tagged as an "artifact" so that a screen reader does not enunciate it in the middle of the text. Although tags make a document more useful they also increase the size of the document and the processing time to create it. Tags are described in section 10.7 of [PDF].
Content
The content must be one of the following:
0
Insert tags.
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The templateCache element is used within the following other elements: cache In automated workflows the same templates are frequently reused. Since parsing and loading a template consumes resources it is desireable to keep recently used templates preloaded in memory. If both the URI and timestamp of a desired template match a template currently in the cache, the copy in the cache is used. Otherwise the template is loaded the normal way.
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The to element
This option controls the location where either Presentation Agent will place either the log data or its output data.
<to Properties: desc="cdata" lock="0 | 1" > ...pcdata... </to>
The to element is used within the following other elements: output When contained within a log element this element controls where Presentation Agent places the log data. When contained within a output this element controls where Presentation Agent will place the generated output data.
Content
The content must be one of the following. In addition, when contained within an output element, the value stderr is prohibited.
null
The log or output data is written to system memory. This is used internally by LiveCycle to avoid unnecessary disk I/O.
stderr
The log data is written to standard error. This option is not available for output data, only for log data.
stdout
I'm guessing that this means the log or output data is written to the system log??
uri
The log or output data is directed to the [URI] specified by this element's sibling uri element. For more information about this element, see [PA].
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XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1172
The type element is used within the following other elements: compression output There are two type elements. When contained by compression, the type element specifies the type of compression to be applied to a file. When contained by output, the type element specifies the type of output to be produced by a form server.
Content
When contained by compression, the content specifes the type of compression to be applied to a PDF file. Allowable compression methods are a subset of those listed in Table 3.5 of the PDF Reference [PDF]. The allowable compression methods are as follows:
none
Compresses images using the CCITT compression method that is used for facsimile. Other streams are compressed using the zlib/flate method.
flate
Compresses images using run length compression. Other streams are compressed using the zlib/flate method. When contained by output, the content specifes the output of a form server as follows:
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native
The form server performs a merge operation, runs calculations, then creates an XDP file.
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The uri element is used within the following other elements: debug output xdc xsl This option takes effect during a phase that depends on its context. It merely supplies additional information to the element which encloses it, hence takes effect during the same phase as its enclosing element.
Content
The content of this element may be empty in some contexts. In contexts where it may be empty, emptiness indicates that the action governed by the enclosing element is not to be performed. For example, when the uri element inside outputXSL is empty, its emptiness signifies that no output XSLT processing is to be done. The uri element may be empty when it is inside a debug, outputXSL, or xsl element. The uri element must not be empty when its immediate container is a data element, a template element, or a xdc element. When the uri element is not empty, its content must be either a filename in animplementation-defined format or a URI in accordance with RFC 2396 [RFC2396]. The set of supported schemes ("http:", "ftp:", "file:", etc.) isimplementation-defined.
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The validate element is used within the following other elements: present For all activities except saving the form to a file, when the validation fails with an error the pending action is cancelled. However when validation generates a warning, or when validation succeeds, the pending action goes ahead. When saving the form to a file the XFA processor does not care whether validation succeeds or fails; it saves the file regardless. This is the only reasonable behavior for a non-interactive application. However the warning and error messages logged during validation may still be useful.
Content
The content is a space-separated list of zero or more activity names. The activity names must be drawn from the following list:
preSubmit
Validate before saving the form to a file. The default behavior is to validate only before submitting. To prevent even this validation supply this element but leave it empty.
XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1176
XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1177
The version element is used within the following other elements: pdf The PDF language was designed to be extensible and has been extended numerous times. To ensure forward compatability with newer versions of PDF, clients and printers that do not recognize a portion of a PDF file simply ignore that portion. Usually this works well, but sometimes it is desireable to generate PDF that caters to older software.
Content
The content must be one of the following:
1.7
This and earlier revisions of PDF are supported by Acrobat 8.0, corresponding to XFA 2.5 and by Acrobat 8.1, corresponding to XFA 2.6. For XFA 2.6 this is the default.
1.6
This and earlier revisions of PDF are supported by Acrobat 7, corresponding to XFA 2.2 and by Acrobat 7.0.5, corresponding to XFA 2.4. (There is no XFA 2.3).
1.5
This and earlier revisions of PDF are supported by Acrobat 6, corresponding to XFA 2.1. This was the earliest version of PDF to include XFA.
1.4
This and earlier revisions of PDF are supported by Acrobat 3. For any given release of XFA the default is the corresponding version of PDF.
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XFA Specification Chapter 29, Adobe Config Syntax Reference Config Reference for LiveCycle Forms Server 1179
The viewerPreferences element is used within the following other elements: pdf The viewer preferences dictionary is described in section 8.1 of [PDF].
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The webClient element is used within the following other elements: present This element is only used when the content of destination is webClient.
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The xdc element is used within the following other elements: driver pcl pdf ps webClient zpl The device control information is used by the driver for the particular printer or language. For example, it contains information about the available fonts.
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The xdp element is used within the following other elements: present The contained options have effect only when the content of destination is xdp.
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The xsl element is used within the following other elements: xdc When this element is contained by a data element it controls the preprocessing of data from the XML data document before loading into the XML Data DOM. When it is contained by a template element it controls the preprocessing of the template definition from the template document before loading into the Template DOM. When it is contained by an xdc element it controls the preprocessing of the device control information. If xsl is empty or if it contains a uri element which is empty preprocessing does not take place - instead the XFA application loads directly from the supplied document into the target DOM. However if xsl contains a non-empty uri element the XFA application gets an XSLT script from the URI which is the content of uri and invokes an XSLT interpreter to preprocess the supplied XML document. The XFA application then loads the preprocessed document into the target DOM. XSLT is defined by XML Transformations (XSLT) Version 1.0 [XSLT]. This option takes effect during the data-load phase if it is contained in data or in the template-load phase if it is contained in template. For more information about this element, see XSLT Transformations.
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The zpl element is used within the following other elements: present ZPL is used by specialized printers that print labels.
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The different zpl elements invoke different device descriptor files via their xdc properties. This brings about the actual difference in generated ZPL.
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Layout Objects
The following table lists the characteristics of all the different layout objects.
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Association at layout time draw containing image static displayable (boilerplate) image layout strategy break control? natural size? Positioned No May be supplied by the properties w and h; otherwise, content + caption + margins. Does not cause splitting growable? splittable? multiply-occurring? container for draw containing geometric figure Yes. Optional limits supplied by properties, such as minH In margins No Image static displayable (boilerplate) geometric figure layout strategy break control? natural size? growable? splittable? multiply-occurring? container for Positioned No Properties w and h required. Does not cause splitting No In margins No
arc, line, rectangle
clickable widget layout strategy break control? natural size? growable? splittable? multiply-occurring? container for Positioned No Content + caption + margins Yes. Optional limits supplied by properties such as maxH. In margins No
checkButton
one item of variable data layout strategy break control? natural size? growable? splittable? multiply-occurring? container for Flowing No Content + caption + margins Yes. Optional limits supplied by properties such as maxH. In margins and between lines No
text
variable numeric data layout strategy break control? natural size? growable? splittable? multiply-occurring? container for Flowing No Content + caption + margins No In margins No
text (single-line)
variable character data layout strategy break control? natural size? growable? splittable? multiply-occurring? container for Flowing No Implementation-defined No In margins No
text (single-line)
clickable widget layout strategy break control? natural size? growable? splittable? multiply-occurring? container for Implementation-defined No Content + caption + margins No In margins No Implementation-defined object variable character data layout strategy break control? natural size? growable? splittable? Flowing No Content + caption + margins No In margins and between lines. Text within rotated containers cannot be split. No
text
pageSet layout strategy break control? natural size? growable? splittable? multiply-occurring? container for rectangle layout strategy break control? natural size? growable? splittable? multiply-occurring? container for
collection of display surfaces Not applicable No Assumed to be infinite Not applicable; already infinite No No
pageArea
boilerplate geometric figure Not a container No Inherited, except line thickness All except line thickness; no limit No No N/A
growable? splittable? multiply-occurring? container for subformSet layout strategy break control? natural size? growable? splittable? multiply-occurring? container for text layout strategy break control? natural size? growable? splittable? multiply-occurring? layout container for
sequence of glyphs and/or embedded objects Flowing No Determined by contents No Between lines. Text within rotated containers cannot be split. No glyph or embedded object
Introduction
The process of text layout is indeed complex. Even Englishwhich is perhaps the simplest language to lay outis not without its challenges. A number of Adobe products, including Acrobat, use the Adobe XFA Text Engine (AXTE) to effect text layout. Description of a complete layout process might occupy volumes. This document attempts to describe one key aspect of the AXTE layout process: line positioning. This document describes the behavior of AXTE when used for XFA-related processing in Acrobat 7 and Acrobat 8. Acrobat 6 used a different text engine which is not discussed here. Some other (non-XFA) subsystems of Acrobat use a different mode of AXTE which behaves slightly differently. Note: This appendix is non-normative, that is, it is not a requirement that XFA processors operate exactly as described here. Rather this appendix is provided to help users of XFA understand the way in which a popular implementation handles certain aspects of text layout.
Line Positioning
An extreme over-simplification might be to describe the text layout process as follows:
Divide the text amongst one or more lines Position each line vertically Within each line, position its text horizontally
This document describes the middle step. One aspect of the first and third steps that makes them difficult to document is that their processing is very language-dependent. For example, the rules for determining how much Arabic text fits in a line, and then positioning that text horizontally within the line are quite different from the rules for Thai text. With one exception, the variables that control line positioning are used in the same way across languages. The exception is overall text orientation: horizontal (e.g., English) of vertical (e.g., Chinese). At this time of writing, vertically-oriented text is very much a work-in-progress in AXTE. Consequently, this document limits itself to horizontally-oriented text. In other words, describing line position is simply describing the vertical position of lines of horizontal text.
Scope
AXTE is only the text engine. It does not stand alone. Instead, there is an application that invokes AXTE services as needed to lay out and render text. AXTE deals with each text object in isolation. It is up to the invoking application to determine where text objects go on the page, screen or output/display medium. For example, any XFA-based application deals with the concept of the XFA box model. This model describes object positioning and display embellishments such as margins and borders. In turn, box model objects are typically positioned in a subformitself a box model object. Eventually, the entire hierarchy gets placed on a page. AXTE is oblivious to the box model constructs and higher-level positioning operations. Instead, it works in its own relative co-ordinate space that XFA applications place in the content region of the box model text object. In other words, AXTE deals only with the text itself and all box
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model application is outside the scope of this document. Note that box model captions are separate text objects from AXTEs perspective. This document makes no attempt to describe the behaviours of higher-level applications. For more information on those behaviours, please consult the applications documentation. AXTE makes extensive use of font metrics. These are measurements of various aspects of glyphs stored in font files. However, there are inconsistencies and ambiguities in the way such metrics are created and used. AXTE relies on Adobes font access library, Adobe CoolType, to access font information and resolve such issues. Explanation of CoolType algorithms is beyond the scope of this document.
Definitions
This document uses the term text block to describe any text object. In an XFA form each text object (including separate caption and field value) is a separate text block. In the XFA world, higher-level XFA processing applies many XFA box model variables to get each AXTE text block positioned properly. These include borders and margins at the object, caption and widget level. As mentioned already, such processing is outside the scope of this document. Note that AXTE has its own margins, applied at the paragraph level. The following diagram demonstrates some of the key concepts in vertical text positioning. Figure 1 shows three lines of text, middle-aligned in a block, with paragraph top and bottom margins. The black box indicates the extent of the text block. Dark grey lines denote the vertical boundaries between lines. Light grey lines indicate significant vertical offsets within lines.
Ascent
Definition Additional vertical ascent applied to the first line to accommodate accents and other ascenders that extend beyond the declared ascent of the font. See the special handling of the letter in the first line of figure 1. Ascent overflow is determined by comparing the bounding boxes of all glyphs in the line against the lines ascent. The line on which text characters are placed. Note that some characters extend below the baseline, for example, the letter p in figure 1. As a variable, the value of the baseline is the positive distance from the top of the lines extent to the baseline position. Amount to shift the baseline of a span of text, either up or down. Height of the text block into which the lines are to be placed. Vertical line spacing computed for a line after all variables have been taken into account except for paragraphs top and bottom margins. The portion of a letter that extends below the baseline, for example, the bottom part of the letter p in figure 1 above.
Baseline
Computed
BS BH DS
Font
The nominal height of the font below the baseline, for example, to accommodate the portion of the letter p in figure 1 that extends below the baseline. Descent is based on the Roman baseline of a font. The distance from the top of the text block to the top of the first line. The declared size of the font. In an ideal world, this would be equal to the sum of the ascent and descent. For example, suppose a text object asserts a font of 12pt Myriad Pro. Then, the characters will normally be scaled such that the sum of the ascent and descent is 12pt. However, for many fonts, the sum of ascent and descent may be more than or less than the font height. Also known as font height. Final height of a line, after all variables and computations have been taken into account. In figure 1, the full height is the distance between the dark grey lines that denote its vertical limits. The fundamental unit of vertical placement of horizontal text. In figure 1, each line is denoted by the text line at the left-hand side.
FO FS
Computed Text
Full Height
FH
Computed
Line
Definition Space inserted between lines to ensure there is a visually pleasing separation between those lines. The line gap may also allow for descenders to clear ascenders or accented capitalized letters on the next line. Note that the line gap is not included in the font size. Note also that the line gap appears between lines. In other words, the number of gaps in a block of text is one less than the number of lines. In AXTE, the line gap is associated with the line that precedes it. Also sometimes referred to as leading, although leading can also mean the distance from one baseline to the next. The height of a line, including ascent, descent and line gap across all fonts in a line.
Override of line height, supplied by the text. It is quite common for the line spacing override to be zero, indicating there is no override in effect. In other words, the line height would be determined from font metrics. Margin applied after the last line in a paragraph. Also referred to as bottom margin. This is independent of margins applied by the XFA box model. Margin applied before the first line in a paragraph. Also referred to as top margin. This is independent of margins applied by the XFA box model. Text height, generally computed as the sum of maximum ascent and descent across a line.
MB
Text
MT
Text
Text Height
TH
Computed
Discussion
This section provides a verbal description of positioning issues.
Flatten field hierarchy Break individual lines Measure and place lines
Coordinate Systems
In any large graphic application, there are often multiple coordinate systems in use, with transformations between each. For this discussion, there are at least four:
Application coordinates Text block coordinates Text line coordinates Font (glyph) coordinates
This discussion concentrates on the middle two. The rendering API used by AXTE supports multiple coordinate systems and stacking of coordinate transformations. It also supports rotation, so that AXTE need only worry about rendering glyphs horizontally and lines vertically.
derived variables. For example, suppose a line has two spans with the same font size, but that height is apportioned differently into ascent and descent between the two spans. If AXTE were to compute text height on each span first, both spans would yield the same height and AXTE would end up with a text height that was too small. Instead, AXTE accumulates ascent and descent separately and computes text height only when all spans have been accumulated. In this way, the computed text height is larger and has room for both the maximum ascent and maximum descent. When examining line content for vertical positioning, AXTE accumulates all of the following variables across the entire line, before performing calculations based on them:
Ascent (A) Descent (D) Line Gap (LG) Spacing Override (SP), though this should not change value over the line
Note that Descent and Line Gap are accumulated independently. Some text processing systems accumulate the sum of Descent and Line Gap.
Special Lines
AXTE is aware of four special line types and applies special vertical positioning processing: Type First line in block Processing If there is a line spacing override and it is larger than the default line spacing, the extra space is ignored on the first line in a text block, for consistency with other text processing applications. Any line gap value does not apply to the last line in a text block. The top margin value applies only if the line is the first in its paragraph. The bottom margin value applies only if the line is the last in its paragraph.
Note that the first line in a text block is also the first line in its paragraph and that the last line in a text block is also the last line in its paragraph. In addition, the first line in a paragraph may be also the last line in its paragraph (one-line paragraph), and the first line in a block may be also the last line in the block (one-line text block).
Baseline Shift
Baseline shifts introduce a fair degree of complexity to the vertical positioning of text.
Relative Shifts
A baseline shift can be specified as a percentage of font size. This means that font metrics must be available to the code processing baseline shifts, and it must compute absolute shifts on-the-fly. Resolving relative shifts into absolute values is done a span-by-span basis, relative to the font size of the span containing the shift. In the algorithm descriptions below, any reference to a spans baseline shift (sBS) assumes that it has been resolved to an absolute value.
Detailed Algorithms
The following two subsections describe the vertical placement algorithms with a minimum of prose. Note that all span-level algorithms are applied before line-level ones, which in turn are applied before any block-level ones.
Span Level
Basic Metric Adjustments
AXTE accommodates a combined ascent and descent larger than the font size. If the sum of the two is less than the font size, it pads the ascent, so that the requested font size is always consumed. In addition, some fonts report unusual values for line gap, ranging from zero to 100% of the font size. Such values could lead to text lines that were too close together or too far apart. AXTE adopts the convention embraced by other Adobe applications that line gap is always determined to be 20% of font size.
if (sA + sD) < sFS then sA = sFS sD sLG = sFS * 0.2
Line Spacing
Internally AXTE has the convention that a line spacing override value of zero means that there is no override in effect (line spacing to be determined from font metrics). Convention has it that increasing line spacing does not push down the first line of a text blockit affects only the remaining lines.
if first line in block then if sSP > sFS then sSP = 0 accumulate sSP in SP
Baseline Shift
Note that most spans have no shift. This discussion applies only to those that do. The spans absolute shift value, sBS, is negative for up-shifts and positive for down-shifts. AXTE treats up-shifts and down-shifts consistently. An up-shift will alter the accumulated ascent only if more ascent space is required after taking both the shift and font size into account. A down-shift will alter the accumulated descent only if more descent space is required after taking both the shift and font size into account. Note that a baseline shift is often accompanied by a change to a smaller font size. Therefore, span variables sA, sD, sLG and sFS are often smaller than those accumulated elsewhere in the line.
Consequently, steps that accumulate data based on these variables often dont change the underlying accumulated values.
if sBS < 0 then accumulate sA + |sBS| in A else accumulate sD + |sBS| in D
Line Level
Text Height
This is simply a matter of computing the overall text height based on the independently accumulated ascent and descent values.
TH = A + D
Derived Spacing
This is essentially the calculation of the line height required for all the text in the line, before considerations that apply to special lines. If any line spacing override is in effect, it is used. Otherwise, AXTE uses the sum of accumulated ascent, descent and line gap.
if SP > 0 then DS = SP else DS = TH + LG
Margin Adjustments
Appropriate margins are dropped if this line doesnt meet special line criteria. If there is no bottom margin or it is too small, it is increased.
if not first line in paragraph then MT = 0 if not last line in paragraph then MB = 0
Full Height
The full height is the total amount of vertical space occupied by the line. AXTE removes the line gap on the last line in a block so that bottom-aligned text doesnt appear shifted up.
FH = MT + DS + MB if last line in block then FH = FH - LG
Baseline
Finally the position of the baselinerelative to the top of the lines spacecan be determined. All non-shifted glyphs are drawn on this baseline (B). For any span that has a baseline shift, its glyphs are position on a baseline computed as B+sBS. When no line spacing override was in effect, version 6 effectively included the line gap above every line (including the first) by computing a baseline above the bottom margin by the lines descent amount. If there is a spacing override, AXTE uses that value to position the descent, provided the spacing override exceeds the text height. In other words, increasing the line spacing override over the text height makes the text move down, but decreasing it below the text height does not make it move up. This is intentional behaviour to obtain the most sensible line positioning in both cases. AXTE has already accounted for the spurious line gap (after the last line) in the calculation of full height above.
if (SP == 0) or (SP LG < TH) then B = MT + TH - D else B = MT + SP - LG - D
Block Level
First Line Offset
Once the full height of all lines in the block has been determined, the first line offset can be set. Under certain circumstances, AXTE may store lines whose total height is greater than the block height. In such a case, the block is treated as being top-aligned. Depending on the application, lines spilling out the bottom may or may not be rendered.
if sum(FH) > BH then FO = 0 else if top alignment then FO = 0 else if middle alignment then FO = (BH sum(FH)) / 2 else FO = BH sum(FH)
1211
Container Properties
Image storage in PDF, version 2.6
When an XFA form is packaged inside a PDF, the XFA form can now draw upon images stored as resources in the PDF container. When an image is referenced by URI the URI is checked against the list of stored images. This allows image reuse without replicating the image data. It also allows the form to be preloaded with images from which users can select using an image picker. If a reference in the client does not match any of the images in the PDF the reference fails. See Storing Images Inside PDF on page 230.
Scripts specify whether they should be executed on the client, server or both, version 2.1
Scripts may now specify whether they should be executed on an XFA processing application that thinks it is a client, one that thinks it is a server, or both. Previously, there was no such distinction.
The new event is especially useful when the choice list is infrequently used and its choices take a while to load.
Event source included as an event attribute, version 2.1 The event element now includes an attribute used to indicated the source of the trigger that activates the event. In the following template sample, the script fires in the context of field "X" when the button associated with "Y" is clicked.
<field name="X"> <event ref="Y" activity="click"> <script> </script> </event> </field> <field name="Y"/>
The default value for ref is "$", indicating the event context is the current node.
Other
See FormCalc support for East Asian scripts in locale designators on page 1224.
Naming Conventions
Support for tags and attribute names containing . and _ version 2.2 ,
In earlier versions of XFA, XFA names were not allowed to include the characters . (period) or _ (underscore). This simplified parsing of SOM expressions in which . is a special character. However this meant that XFA could not support data files containing element tags or attribute names containing either . or _. In XFA 2.2 the definition of an XFA name is relaxed so that almost any valid tag or attribute as defined in [XML] can be used in data. The sole exception is that XFA still does not support the colon (:) character in tags and attributes; although the colon character is allowed by XML, it is rarely used because it conflicts with [XML Namespace].
Note that XFA 2.1 also requires XFA-SOM expression parsers to support an escape notation using \ (backslash) to escape the special meaning of . inside SOM expressions. In addition scripts written in FormCalc (FormCalc Specification on page 902) require special handling of references to data nodes having names containing the . character. See Using SOM Expressions in FormCalc on page 93 for more information.
Specifying data attributes to use for naming nodes in the XFA Data DOM, version 2.1
The config element can specify the data attribute from which the data loader obtains the node name, rather than using the data element name. This config attribute is useful in situations where the element names are not meaningful. See The nameAttr Element on page 451.
Data Unloading
Use of data description when writing out XML, version 2.1
When loading data from XML XFA does not need to know the schema of the input XML data document. However when unloading to XML, XFA 2.1 allows for the use of a schema to control the form of the output XML data document. When no schema is supplied the behavior is unchanged from previous versions. The schema, if present, is contained in an XFA Data Description as described in Unloading Node Type Information on page 137. See Data Values Representing Null Data on page 126 for a detailed description of the way in which the data description is applied when unloading.
Data Binding
Complex binding, version 2.4
Data binding can update properties other than value via an explicit reference to the Data DOM or to a web service. Almost any property can be updated this way at bind time, for example a caption can be copied from a data value. See Bind to Properties (Step 5) on page 187.
Layout
XFA Foreground (XFAF), version 2.5
A new way of declaring boilerplate is defined. In traditional XFA forms the boilerplate is defined as draw elements and laid out at run time. This applies whether the form is static or dynamic. In the new XFAF forms the boilerplate is laid out in advance as a PDF appearance stream split up into pages. This reduces run time overhead at the cost of fixing the appearance (but not the order) of each page. It also allows finer control over the appearance of boilerplate text within a page because PDF supports features such as kerning that XFA does not. It is still necessary to use draw for boilerplate when you need to add or omit sections within a page dynamically. For this reason traditional boilerplate is still fully supported by XFA. An XFAF form is restricted to a subset of template elements. The type of form in which each element is used is indicated in the element description within the template syntax specification. See How to Read an Element Specification on page 493. For more information about XFAF see The Relationship between XFA and PDF on page 19 and Static versus Dynamic Forms on page 27
Rich Text
Embedded objects, version 2.1
Rich text may now include references to text or images. Such references may be expressed using the Scripting Object Model (for internal references) or using URIs (for external references). Embedded objects are resolved dynamically.
Widget Appearance
Control over scrolling, version 2.5
New properties hScrollPolicy and vScrollPolicy have been added to various widgets to give explicit control over horizontal and vertical scrolling when being used interactively. For more information see Date/Time Editing Widget on page 422, Numeric Edit on page 424, and Text Edit Widget on page 426.
Caption Appearance
Clarification of caption reserve, version 2.5
Previous versions of this specification did not make clear the meaning of a caption reserve set to zero. This is now clarified. For more information see the description of the caption element under the Template Specification on page 493.
Form Navigation
Accelerator key allows keyboard sequence to bring fields into focus, version 2.2
Fields and Exclusion Groups may now have an accelerator key property (accessKey). When the character assigned to a fields accessibility key is selected in combination with the systems modifier key (on Windows, Alt), the forms focus shifts to the indicated field.
Locale Set, an XML grammar for representing localization information, version 2.1
The Locale Set contains locale-specific data used in localization and canonicalization. Such data includes picture clauses for representing dates, times, numbers, and currency. It also contains the localized names of items that appear in dates, times and currencies, such as the names of months and the names of the days of the week. It also contains mapping rules that allow picture clauses to be converted into a localized string that can be used in UI captions and prompts.
template-provided picture clauses, in resolving canonicalization/localization when multiple XFA fields provide conflicting bind picture clauses for the same data. See Transforms on page 436.
Picture clause symbols for zero and null values, version 2.2
Picture clauses now include picture clause symbols that can format/parse null data and zero data. These new symbols are identified with category designators that identify them as applying to null data or zero data. See Null-Category Picture Clauses on page 1037 and Zero-Category Picture Clauses on page 1037.
Full-width numeric values. All time, date, and number data formats can be specified as full-width characters. In text that combines Latin numbers and Asian-language ideographs, full-width numbers provide a consistent size and a squared shape that is more consistent with Asian-language ideographs.
Ideographs
All time and date information may be expressed using ideographs. The particular script (ideograph system) used may be the default for the prevailing locale or may be explicitly declared in the prevailing locale.
Tens rule
All ideographic numeric values may be expressed using the Arabic numeral system or the tens rule numeral system. A numeral system is a method for using numerals to represent numbers.
A script is an entire set of characters or ideographs, such as Korean Hangul or Latin. This change is consistent with corresponding changes in Localization and Picture Clauses and New XFA Features. Note: XFA template values for the locale attribute is limited to language and country code designators, such as fr_FR (French specific for France) and zh (Chinese).
Scripting
Scripting Object Model (SOM)
Value tests in SOM expressions, version 2.4
The SOM expression syntax is extended to allow selection of a subset of nodes by applying a Boolean expression to each. See Selecting a Subset of Sibling Nodes on page 89.
FormCalc
New functions to access locale, version 2.1
FormCalc now provides several functions that support locale. In particular, it allows conversion of canonical localizable data, such as currency, date, and time, from/to localized presentations of such data. It also allows access to the prevailing locale for any form data, where prevailing data is obtained from the template, from the host system, or from the default locale for XFA processing applications.
JavaScript
Change "ECMAScript" to "JavaScript", version 2.6
Most references to ECMAScript in this specification have been changed to JavaScript in deference to ISO terminology and to the PDF reference [PDF]. In practice this makes no difference because this specification has never required any support for JavaScript/ECMAScript, much less compliance with a particular version of the ECMA or ISO standard. A few references to ECMAScript remain where the context requires it.
Schemas
This declares that the element a has three child elements x, y, and z which may appear in any order. There are six possible permutations for the child elements: xyz, xzy, yxz, yzx, zxy, and zyx . This could be declared in XML-Schema but it would have to be declared as six alternative sequences of child elements. Unfortunately the number of permutations goes up as the factorial of the number of distinct child elements and XFA has elements with dozens of distinct children. Hence it is not practical to represent XFA in XML-Schema while preserving the free ordering.
XFA Profiles
Starting with XFA 2.5 there is a facility to specify that a form uses a subset of the full XFA capability. This is indicated in the template element by a non-default value for the baseProfile attribute. Currently the only specified value is interactiveForms, which corresponds to the XFAF subset. When the template element specifies a profile, the contents of the template must be restricted to the set of elements and attributes allowed by that profile. For the restrictions of the XFAF profile see Grammar Excluded from XFAF on page 240. Caution: The XFA Schema attached to this Appendix is defined for the full XFA grammar. It will not detect the presence of elements or attributes that are not appropriate for the profile specified by the form.
1228
Description configuration connections to web services user data portion of the dataSets packet data description portion of the dataSets packet locale definitions accompanying PDF connections to databases XSLT stylesheet(s) for custom transformation of data and/or the template template container for everything else annotations signing control
Attachment
Note: These schemas validate XFA 2.6 grammars only. They ignore packets generated for other versions of XFA which use different namespaces. Some namespaces stay the same from one version of XFA to the next, while others change. The template grammar in particular always changes from one version of the specification to the next, hence the template packet namespace always changes.
Note: The XDP schema allows it to contain arbitray custom packets as child elements. The validation accepts any and all such packets. However if a packet matches one of the types declared in any of the schemas then the content of that packet is validated against that schema.
Bibliography
The references in this section are grouped in the categories: General References, Fonts and Character Encoding References, and Barcode References.
General References
[ADO]
ADO API Reference. Microsoft. At press time the most current version, 2.8, is available at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/ado270/htm/mdmscadoapirefe rence.asp
[Adobe-Patent-Notice]
Adobe Patent Clarification Notice. At press time there are two relevant Patent Clarification Notices, one for PDF and one for XDP, and they are available at http://adobe.com/go/developer_legal_notices.
[CSS2]
Cascading Style Sheets, level 2 (CSS2) Specification. B. Bos, H. W. Lie, C. Lilley, I. Jacobs, 12 May 1998. Available at http://www.w3.org/TR/REC-CSS2
[ElectronicSecurity]
Exclusive XML Canonicalization. World Wide Web Consortium, 2002. Available at http://www.w3.org/TR/xml-exc-c14n/.
[HTTP]
Hypertext Transfer Protocol -- HTTP/1.1. World Wide Web Consortium. Available at http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.5
[IANA]
IEEE 754: Standard for Binary Floating-Point Arithmetic. This standard may be purchase through http://grouper.ieee.org/groups/754.
1231
[ISO-639-1]
Codes for the representation of names of languages -- Part 1: Alpha-2 code. International Organization for Standardization. Available for purchase at http://www.iso.org/
[ISO-3166-1]
Country Codes. International Organization for Standardization. Available for purchase at http://www.iso.org/
[ISO-4217]
Codes for the representation of currencies and funds. International Organization for Standardization. Available for purchase at http://www.iso.org/
[ISO-8601]
Data elements and interchange formats Information interchange Representation of dates and times. International Organization for Standardization (ISO), 2000. Available for purchase at http://www.iso.org/.
[ISO-15924]
ISO 15924:2004 Information and documentation -- Codes for the representation of names of scripts. International Organization for Standardization (ISO), 2004. Available for purchase at http://www.iso.org/.
[ISO-19005-1]
ISO 19005-1 Document Management - Electronic document file format for long-term preservation -Part 1: Use of PDF 1.4 (PDF/A-1). International Organization for Standardization (ISO), 2007. Available for purchase at http://www.iso.org/.
[ISO-32000-1]
ISO/DIS 32000 - Document management -- Portable document format -- PDF 1.7. International Organization for Standardization (ISO), 2007. Available for purchase at http://www.iso.org/.
[JING]
JING. A RELAX NG validator in Java. Thai Open Source Software Center Limited, 2001, 2002, 2003. Available at http://www.thaiopensource.com/relaxng/jing.html.
[LC-Scripting-Reference]
PDF Reference, sixth edition, Adobe Portable Document Format, Version 1.7. Adobe Systems Incorporated, 2006. Available at the PDF Reference Page at http://www.adobe.com/go/partner_public_pdf_ref.
[PostScript]
PostScript Language Reference, Third Edition. Also known as the Red Book. Addison-Wesley, 1999. Available at the PDF Reference Page at http://www.adobe.com/go/partner_public_pdf_ref.
[RELAX-NG]
RELAX NG Specification, Committee Specification: 3 December 2001. The Organization for the Advancement of Structured Information Standards (OASIS), 2001. Available at http://www.oasis-open.org/committees/relax-ng/spec-20011203.html.
[RFC1738]
Uniform Resource Locators (URL). T. Berners-Lee, L. Masinter, M. McCahill, 1994. Available at http://www.ietf.org/rfc/rfc1738.txt.
[RFC1951]
DEFLATE Compressed Data Format Specification version 1.3. P. Deutsch, 1996. Available at http://www.ietf.org/rfc/rfc1951.txt
[RFC1766]
Tags for the Identification of Languages. Internet Engineering Task Force, March 1995 http://www.ietf.org/rfc/rfc1766.txt.
[RFC2045]
Multipurpose Internet Mail Extensions (MIME) Part One, Format of Internet Message Bodies. N. Freed, N. Borenstein, November 1996. Available at http://www.ietf.org/rfc/rfc2045.txt.
[RFC2046]
Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types. N. Freed, N. Borenstein, 1996. Available at http://www.ietf.org/rfc/rfc2046.txt.
[RFC2119]
RFC2119: Key words for use in RFCs to Indicate Requirement Levels. S. Bradner, March 1997. Available at http://www.ietf.org/rfc/rfc2119.txt.
[RFC2376]
RFC2396: Uniform Resource Identifiers (URI): Generic Syntax. T. Berners-Lee et al., August 1998. Available at http://www.ietf.org/rfc/rfc2396.txt.
[RFC2397]
RFC2397: The "data" URL scheme. L. Masinter, August 1998. Available at http://www.ietf.org/rfc/rfc2397.txt.
[RFC3161]
RFC3161: Internet X.509 Public Key Infrastructure Time-Stamp Protocol (TSP). C. Adams et al., August 2001. Available at http://www.ietf.org/rfc/rfc3161.txt.
[RFC-3066bis]
RFC 3066bis is the identifier for a working draft of Tags for Identifying Languages. Available at http://xml.coverpages.org/draft-phillips-langtags-03.txt
[RFC3280]
Public Key Infrastructure (X.509) (PKIX) Certificate and Certificate Revocation List (CRL) Profile. IETF RFC 3280, April 2002 ,http://www.ietf.org/rfc/rfc3280.txt
[SOAP1.1]
Simple Object Access Protocol (SOAP) 1.1. World Wide Web Consortium, 2000. Available at http://www.w3.org/TR/2000/NOTE-SOAP-20000508/. Note that although this is merely a note, not a recommendation, it has been adopted as the framework for [[WSDL1.1].
[SRGB]
IEC 61966-2-1: Multimedia systems and equipment - Colour measurement and management - Part 2-1: Colour management - Default RGB colour space sRGB. October 1999. Amended by IEC 61966-2-1-am1: Amendment. March 2003. Available at http://webstore.iec.ch/.
[TRANG]
Trang. Multi-format schema converter based on RELAX NG. Thai Open Source Software Center Limited, 2002, 2003. Available at http://thaiopensource.com/relaxng/trang.html.
[URI]
RFC2396: Uniform Resource Identifiers (URI): Generic Syntax. T. Berners-Lee, R. Fielding, L. Masinter, August 1998. This document updates RFC1738 and RFC1808. Available at http://www.ietf.org/rfc/rfc2396.txt.
[UTS35]
Unicode Technical Standard #35: Locale Data Markup Language (LDML). M. Davis, July 2007. Available at http://www.unicode.org/reports/tr35/.
[WSDL1.1]
Web Services Description Language (WSDL) 1.1. World Wide Web Consortium, 2001. Available at http://www.w3.org/TR/2001/NOTE-wsdl-20010315
[XFDF]
XML Forms Data Format Specification Version 2.0. Adobe Systems Incorporated, 2003. Available at http://www.adobe.com/go/learn_lc_XFA.
[XHTML]
XHTML 1.0: The Extensible HyperText Markup Language - A Reformulation of HTML 4 in XML 1.0. World Wide Web Consortium, 2000. Available at http://www.w3.org/TR/2000/REC-xhtml1-20000126/.
[XML1.0]
Extensible Markup Language (XML) 1.0 Specification. World Wide Web Consortium, 1998. Available at http://www.w3.org/TR/REC-xml
[XML1.1]
Extensible Markup Language (XML) 1.1 (Second Edition). World Wide Web Consortium, 2006. Available at http://www.w3.org/TR/xml11.
[XMLBASE]
XML Base. World Wide Web Consortium, June 2001. Available at http://www.w3.org/TR/xmlbase/.
[XMLDOM2]
Document Object Model (DOM) Level 2 Specification: Version 1.0. World Wide Web Consortium, 1999. Available at http://www.w3.org/TR/DOM-Level-2/.
[XMLDSIG-CORE]
XML-Signature Syntax and Processing. World Wide Web Consortium, 2001. Available at http://www.w3.org/TR/xmldsig-core/.
[XMLEncryption]
XML Encryption Syntax and Processing. World Wide Web Consortium, 2002. Available at http://www.w3.org/TR/xmlenc-core/.
[XMLNAMES]
Namespaces in XML. T. Bray, D. Hollander, A. Layman, 14 January 1999. XML namespaces provide a simple method for qualifying names used in XML documents by associating them with namespaces identified by URI. Available at http://www.w3.org/TR/REC-xml-names
[XMLSchema]
XML Schema Part 1: Structures and XML Schema Part 2: Datatypes. World Wide Web Consortium, 2001. Available at http://www.w3.org/TR/xmlschema-1/ and http://www.w3.org/TR/xmlschema-2/ , respectively.
[XMPMeta]
XML Path Language (XPath) Version 1.0. World Wide Web Consortium, 1999. Available at http://www.w3.org/TR/xpath.
[XSL-FO]
Extensible Stylesheet Language (XSL) Version 1.1. World Wide Web Consortium, October 2006. Available at http://www.w3.org/TR/xsl11/.
[XSLT]
XSL Transformations (XSLT) Version 1.0. World Wide Web Consortium, November 1999. Available at http://www.w3.org/TR/xslt.
XFA Specification Chapter , Bibliography Fonts and Character Encoding References 1236
See: http://www.microsoft.com/globaldev/reference/dbcs/950.htm.
[GB2312]
Chinese Character Encoding Charset for Information Exchange Base Set (National Standard GB2312-80). State Bureau of Standardization of the People's Republic of China (PRC), 1980. A paper copy of this standard, with English titles but Chinese text, can be purchased at http://webstore.ansi.org/ansidocstore/chinese_standards.asp?.
[ISO-8859-1]
Information technology 8-bit single-byte coded graphic character sets Part 1: Latin alphabet No. 1. International Organization for Standardization (IS0), 1998. Available for purchase at http://www.iso.org/.
[ISO-8859-2]
Information technology 8-bit single-byte coded graphic character sets Part 2: Latin alphabet No. 2. International Organization for Standardization (IS0), 1998. Available for purchase at http://www.iso.org/.
[ISO-8859-7]
Information technology 8-bit single-byte coded graphic character sets Part 7: Latin/Greek alphabet. International Organization for Standardization (IS0), 1998. Available for purchase at http://www.iso.org/.
[ISO-10646]
Information technology Universal Multiple-Octet Coded Character Set (UCS) Part 1: Architecture and Basic Multilingual Plane. International Organization for Standardization (ISO), 2000. Available for purchase at http://www.iso.org/.
[KSC5601]
Code for Information Interchange (Hangul and Hanja). Korea Industrial Standards Association, 1987, Ref. No. KS C 5861-1992.
[Shift-JIS]
JIS X 0208: 7-bit and 8-bit double byte coded KANJI sets for information interchange. Japanese Industrial Standards Committee, 1997. Available for purchase at http://www.webstore.jsa.or.jp/webstore/Top/indexEn.jsp?lang=en.
[UAX-9]
Unicode Standard Annex #9. The Unicode Consortium, 2005. Available at http://www.unicode.org/unicode/reports/tr9/.
[UAX-14]
Unicode Standard Annex #14. The Unicode Consortium, 2002. Available at http://www.unicode.org/reports/tr14/tr14-12.html.
[Unicode-2.1]
The Unicode Standard, Version 2.1.9. The Unicode Consortium, 2002. This version of Unicode is referenced only for its definition of Basic Multilingual Plane (BMP) character set. All other Unicode references relate to the Unicode Standard, Version 3.2 (below). Available at http://www.unicode.org/standard/versions/components-pre4.html#Unicode_2_1_9.
[Unicode-3.2]
The Unicode Standard, Version 3.2. The Unicode Consortium, 2002. Available at http://www.unicode.org/standard/versions/components-pre4.htmll#Unicode_3_2_0.
Barcode References
[APO-Barcode]
ANSI/AIM BC13 ISS - Aztec Code. American National Standards Institute, Inc. and AIM International (year of publication not available). Available for purchase at http://www.aimglobal.org/aimstore/.
[Codabar]
ANSI/AIM BC3-1995, USS - Codabar. American National Standards Institute, Inc. and AIM International, 1993. Available for purchase at http://www.aimglobal.org/aimstore/.
[Code2Of5Interleaved]
ANSI/AIM BC2-1995, USS - Interleaved 2 of 5. American National Standards Institute, Inc. and AIM International, 1993. Available for purchase at http://www.aimglobal.org/aimstore/.
[Code39]
ANSI/AIM BC1-1995, Uniform Symbology Specification - Code39. American National Standards Institute, Inc. and AIM International, 1993. Available for purchase at http://www.aimglobal.org/aimstore/.
[Code49]
ANSI/AIM BC6-1995, Uniform Symbology Specification - Code49. American National Standards Institute, Inc. and AIM International, 1993. Available for purchase at http://www.aimglobal.org/aimstore/.
[Code93]
ANSI/AIM BC5-1995, Uniform Symbology Specification - Code93. American National Standards Institute, Inc. and AIM International, 1993. Available for purchase at http://www.aimglobal.org/aimstore/.
[Code128-1995]
ANSI/AIM BC4-1995, Uniform Symbology Specification - Code128. American National Standards Institute, Inc. and AIM International, 1995. Available for purchase at http://www.aimglobal.org/aimstore/.
[Code128-1999]
ANSI/AIM BC4-1999, Uniform Symbology Specification - Code128. American National Standards Institute, Inc. and AIM International, 1999. Available for purchase at http://www.aimglobal.org/aimstore/.
[DataMatrix]
ANSI/AIM BC11 ISS - Data Matrix. AIM International (year of publication not available). Available for purchase at http://www.iso.org/.
[ISO-15420]
Information technology Automatic identification and data capture techniques Barcode symbology specification EAN/UPC (ISO/IEC 15420:2000). International Organization for Standards (ISO) and International Electrotechnical Commission (IEC), 2000. Available for purchase at http://www.iso.org/.
[LOGMARS]
MIL-STD-1189B. United States (of America) Department of Defence, 1984. Note: this standard has been withdrawn. The Department of Defence has adopted [Code39] in its place. However according to http://www.afmc.wpafb.af.mil/HQ-AFMC/LG/LSO/LOA/stands.htm on 5 December 2003, "Users are cautioned to evaluate this document for their particular application before citing it as a replacement document."
[Maxicode]
ANSI/AIM BC10-ISS, Maxicode. American National Standards Institute, Inc. and AIM International, 1996. Available for purchase at http://www.aimglobal.org/aimstore/.
[PDF417]
Uniform Symbology Specification PDF417. AIM International, 1998. Available for purchase at http://www.aimglobal.org/aimstore/.
[QRCode]
International Symbology Specification - QR Code (AIM ITS/97/001). AIM International, 1997. Available for purchase at http://www.aimglobal.org/aimstore/.
[RM4SCC]
Mailsort User Guide, sections "Mailsort 700" and "Mailsort 120". Royal Mail (United Kingdom), 2006. Available at http://www.mailsorttechnical.com/downloads_mailsort_user_guide.cfm.
[RSS14]
Reduced Space Symbology (RSS) bar code symbology specification. AIM International, 2006. Also known as ISO/IEC 24724-2006. Available for purchase at http://www.aimglobal.org/aimstore/.
[Telepen]
Uniform Symbology Specification - Telepen. AIM International (year of publication not available). Available for purchase at http://www.aimglobal.org/aimstore/.
[USPS-C100]
Facing Identification Mark (FIM). United States (of America) Postal Service, 2006. Replaces the C100 standard. Available at http://pe.usps.com/text/dmm300/708.htm#wp1316612.
[USPS-C840]
Barcoding Standards for Letters and Flats. United States (of America) Postal Service, 2006. Replaces the C840 standard. Available at http://pe.usps.com/text/dmm300/708.htm#wp1352817.
Glossary
A
ambient locale The locale specified for the operating system or environment in which an application operates. In the rare circumstance where the application is operating on a system or within an environment where a locale is not present, the ambient locale defaults to English United States (en-US), which is the default locale. application processor See XFA application processor annotation Additional content added to a PDF document. Such content includes comments. connection set The connections used to initiate or conduct web services. Such a set defines connections for web services (WSDL), sample data (XML), and schema files (XSD). container element A type of XFA template element that specifies either of the following: (a) content elements and the form-related aspects of navigating to, displaying and processing those elements; or (b) other container elements and the form-related aspects of navigating to, displaying and processing those container elements. Container elements include pageArea, area, subform, field, and exclGroup. container object or node
B
boilerplate See fixed content (boilerplate).
An object that can be populated with content objects or with other subordinate container objects. Container objects are created during data binding and layout processing. Container objects include area, subform, field, and exclGroup. content element A type of XFA template element that houses datatyped text or graphic elements (lines and images). Such text or graphic elements may be defined as default data or un-changeable data in the content element. content object or node An object that houses datatyped pcdata (text) or graphic elements (lines and images). New content objects are created during data binding and layout processing. The data may be pre-defined in the content element or may be provided by the form user or by some other source, such as Web Service interactions.
C
canonical format A locale-agnostic, standardized way to represent date, time, numbers, and currencies. Canonical time and date formats are subsets of the ISO-8601 standard [ISO-8601]. canonicalization The part of input parsing that considers locale when converting locale-specific dates, times, numbers, and currencies into canonical format. See also localization. character data All text within an XML document that is not markup constitutes character data. See the description of character data within section 2.4 Character Data and Markup of the XML specification [XML].
1240
Glossary
1241
content type element A content type element defines the type of the data in the parent content element. It may also include default data or un-changeable data, which is used when the form is displayed. Examples of such datatype elements are date, decimal, and image. current record It is possible to read and process the data document one record at a time rather than loading it all into memory at once. When operating in this mode the record which is currently being processed is called the current record. Records immediately preceding and following the current record may also be loaded, depending upon the setting of a configuration option. When record processing is not being done the current record should be understood as including the entire data document. See Creating, Updating, and Unloading a Basic XFA Data DOM on page 109 for more information about record processing.
of the data. This feature also retains the structure of the XML Data DOM and the values of objects in the XML Data DOM that are not used used in the XFA Form DOM. data loader A program or subsystem responsible for loading data from an XML data document into the XFA Data DOM. data unloader A program or subsystem responsible for unloading data from the XFA Data DOM into a new XML data document. data value A data value is an object in the XFA Data DOM that corresponds to an element holding character data (and possibly other elements) in an XML data document. Within the XFA Data DOM leaf nodes are usually data values. A data value may have other data values descended from it but it must not have any data group descended from it. date/time format style A locale-independent style of representing date or time. Supported date and time styles include short, medium, long, and full. One date style is designated the default, as is one time style. The date/time format styles may be defined in the localeSet element, described inThe localeSet Element on page 154. default locale See ambient locale. default mapping rule A rule that governs, by default, how an XML data document is mapped to an XFA Data DOM. document An serialized XML tree. A document is typically stored as a file. document object model (DOM) A Data Object Model is an in-memory representation of data as a tree of objects. An object which belongs to a DOM may be referred to as a node in order to emphasize its role as a tree
D
data binding (merging)
The process of merging the Data DOM with the Template DOM.
Data DOM (XFA Data DOM) The Data DOM is the tree-structured representation of user data. During the data binding process, the Data DOM supplies the content for fields in the merged form. The term Data DOM differs from the XML Data DOM. data group A data group is an object in the XFA Data DOM that corresponds to an element holding other elements (as opposed to character data) in an XML data document. Within the XFA Data DOM interior nodes are usually data groups. A data group may have other data groups and/or data values descended from it. data independence An XFA feature that allows a form designer to change a template without requiring that corresponding changes be made to the structure
member. For example, a form node is an object belonging to the Form DOM. document order The order in which a Form DOM is traversed. Document order starts at the root of the content subtree of the Form DOM and traverses the content subtree depth-first and left-to-right (oldest-to-newest). document range The section(s) of the XML data document that is/are loaded into the XFA Data DOM. dynamic form An XFA form that automatically adds containers and rearranges its layout depending on the data being entered into it. In a dynamic form, the arrangement of the form is determined by the arrangement of the data supplied to the Form DOM. A dynamic form is enabled by an XFA template that specifies subforms that may be replicated, depending on the data supplied to the Form DOM. See also static form.
empty merge An empty merge occurs when a template is merged with an empty data document (or no data document at all). The rules for an empty merge are slightly different than the rules for a non-empty merge. Different attributes of The Occur Element are used and default data, if defined by the template, is inserted. extended mapping rule A rule that is not in effect by default but is available as an override or extension to the default-mapping rules.
F
fixed content (boilerplate) Data associated with a draw. Such data is defined by the template designer and does not vary throughout the life of the form, with the following exception: Dynamic forms may omit fixed content that appears in unused containers. See also variable content. form creator The person and/or software that creates a form template, possibly along with other information such as a data description. form data The variable data within a form. This is data that the user can enter or modify and/or that is loaded from an external source such as a database at the time the form is presented to the user. Form DOM The Form DOM is the tree-structured representation of the filled-in form. The Form DOM is created and populated by the data binding process. The Form DOM is not, however, ready to display; there is another step required to perform a physical layout, then another to render the form to a display or printer. The Form DOM embodies structural relationships, not physical representations. form template A collection of related subforms and optional business logic, constraints, and processing rules.
E
element content XML elements that contain only XML child elements, optionally separated with white space, constitute element content. See the description within section 3.2.1 Element Content of the XML specification [XML]. element type The first token within an XML start or end tag identifies the element type. The element type is a string containing a qualified name. A qualified name consists of an optional namespace prefix and colon, followed by a mandatory local name. See the description within section 3. Qualified Names of Namespaces in XML [XMLNAMES]. empty element An XML element that does not enclose any content.
G
global When record processing is in effect the current record and optionally other records adjacent to it are loaded into the Data DOM. In addition, global data is loaded into the Data DOM and kept in memory while records cycle in and out. Hence, global data is available for use by scripts throughout the document. For example, when an organization carries on business under several different names, the appropriate name is often made global so that it can be displayed on every page of a multi-page document without having to incorporate it in the data more than once. Data is made global by placing it in elements that are at the same level as or higher in the hierarchy than the records. In addition a field may be marked global, which means it is a candidate for matching to global data (but it can still match to non-global data). grammar Set of rules that specify the use of words in a particular namespace. This specification describes several XFA-related grammars, including template, config , and localeSet.
L
Layout DOM
layout node A layout node is any object in the Layout DOM. layout processor The layout processor is an entity tasked with laying out displayable content on the display surface(s), typically on behalf of an application. locale A standard term used to identify a particular nation (language and/or country). A locale defines (but is not limited to) the format of dates, times, numeric and currency punctuation that are culturally relevant to a specific country. locale-dependent format A style of representing dates, times, numbers, and currencies that is unique to the locale. locale set Locale-specific data used in localization and canonicalization. Such data includes picture clauses for representing dates, times, numbers, and currency. It also contains the localized names of items that appear in dates, times and currencies, such as the names of months and the names of the days of the week. It also contains mapping rules that allow picture clauses to be converted into a localized string that can be used in UI captions and prompts. localization The part of output formatting that involves converting canonical dates, times, numbers, and currencies into formats and characters commonly used in a particular locale. See also canonicalization. localized date or time format Locale-specific character strings intended for use in UI captions and prompts. Such strings are defined in the localeSet element (locale set). Some FormCalc functions return localized date or time formats.
I
input parsing The process of transforming a formatted input value into a raw elemental value, under the direction of a picture clause. This term is the inverse of output formatting. instance manager An object placed into the Form DOM by the data binding process for the use of scripts. One instance manager is placed in the Form DOM for each dynamic subform in the Form DOM. A script can use the instance manager to determine how many instances of the subform have been copied into the Form DOM and it can delete instances or insert more instances.
Localized date or time formats cannot be used as date or time picture clauses (picture clause (pattern)). In some locales, localized date or time formats are identical to their picture clause counterparts; however, this similarity is not consistent across locales. For example, en_US might use MM/DD/YY as both a picture clause and a localized date format. In contrast, the fr_CA locale might use a localized date format of aa/nn/jj as the counterpart to the MM/DD/YY picture clause.
nominal extent does not necessarily include the whole physical extent of a visible object or, in the case of a container, its contents. normalizing the Data DOM A process optionally performed by XFA processing applications to move data nodes around to reconcile data-binding contradictions. An example of such a contradiction is a data node being bound to a form node, even though the nearest merge-able ancestor of the data node and the nearest merge-able ancestor of the form node are not bound to each other. Re-Normalization (Step 4) on page 182.
M
merge The data-binding process is sometimes called the merge process because it can be thought of as merging content from the Data DOM with structure from the Template DOM to create a single document, the Form DOM. However it should be noted that it is possible to perform a data binding operation without a Data DOM, in which case the Form DOM gets its content from default data in the Template DOM. metadata In this specification, metadata refers to data expressed via XML attributes. mixed content XML elements that contain character data interspersed with XML child elements constitute mixed content. See the description of mixed content within section 3.2.2 Mixed Content of the XML specification [XML].
O
output formatting The process of transforming a raw value into a formatted value, under the direction of a picture clause. This term is the inverse of input parsing.
P
page area A description of a rendering surface, such as one side of a printed page or a screen-display. page set An XFA element used to represent a set of display surfaces, such as a stack of sheets of paper. For example, a page set for a duplex document would nominally consist of two page areas: a front page area and a back page area. In another example, a page set for an invoice might consist of three page areas: a first page bearing a letter, followed by alternating statement-front and statement-back pages. PDF subassembly An unit of content added to the top level of a PDF document tree. Examples of PDF subassemblies are annots, data, and signature. picture clause (pattern) A sequence of symbols (characters) that specify the rules for formatting and parsing textual data, such as dates, times, numbers and text. Each
N
node An object linked to other objects within a hierarchical structure. In XFA the hierarchical structure is always one of a predefined set of DOMs (Document Object Models). All objects specified in XFA are nodes. nominal extent The nominal extent of an object is a rectangle aligned with the X and Y axes that covers the region on the page reserved for the object. The
symbol is a place-holder that typically represents one or more characters that occur in the data. plain text Text that does not contain any markup signifying formatting, hence, text that is not rich text. prevailing locale
static form An XFA form that has a set number of subforms. Unlike dynamic forms, static forms cannot add subforms to accommodate additional data.
T
template
The locale obtained after resolving locales supplied from the following sources (in priority order) the picture clause, the field or subform locale property, or the ambient locale. The prevailing locale affects input parsing and output formatting. It also affects the results of FormCalc functions.
See form template. Template DOM The Template DOM is the tree-structured representation of the template for the form. During the data binding process it supplies the prototype objects and relationships between objects which are copied into the Form DOM. Hence the Template DOM dictates the structure of the resulting merged form.
R
rich text Text containing markup signifying formatting such as bold and underline.
U
UI A type of element that describes how data should be presented to a form user. UI elements are defined in the XFA template grammar.
S
script A set of instructions for processing data or initiating events such as data exchange with a server. In XFA scripts are not necessary for common electronic form functionality, but scripts may be used to provide greater control or meet unusual needs. SOM (XFA Script Object Model) A model for referencing values, properties and methods within a particular Document Object Model (DOM). SOM resolver A software component that interprets a SOM expression, yielding the set of all nodes that match the expression. The resulting set may be empty. source set ADO database queries, used to describe data binding to ADO data sources
V
variable content Data associated with an exclusion group or field. Such data, which varies throughout the life of the form, may be provided by any of the following: the template as a default value, the person filling out the form, an external source, a calculation, and other sources. See also fixed content (boilerplate).
W
Web service An automated service provided by an external (non-XFA) processor and accessed using the Simple Object Access Protocol (SOAP) [SOAP 1.1] and Web Services Description Language (WSDL) [WSDL 1.1]. Such services are often made available to all comers across the Internet, hence the name "web service".
widget A simulated mechanism displayed by the user interface to enable the user to enter or alter data. Examples of widgets are radio buttons and popup-up lists.
X
XCI (XML Configuration Information) Configuration information for a Presentation Agent output driver. The root element i n the XCI grammar is the config element (Config Specification on page 752). XDC (XML Device Control) A package within an XDP that holds information specific to a particular output device (such as a printer) or input-output device (such as a cell phone). This specification does not define the contents of the XDC package. XDP (XML Data Package) Provides a mechanism for packaging specific types of content within a surrounding XML container. The types of content include PDF, XML configuration information (XCI), dataSet, sourceSet, XSLT style sheet, XFA template, and XFDF (form data). XDP may also contain undocumented packets, such as those used to communicate events to a Form Server. The XDP format is intended to be an XML-based companion to PDF. XFA (XML Forms Architecture) An application of XML for modeling electronic forms and related processes. XFA provides for the specific needs of electronic forms and the processing applications that use them. XFA is a collection of specifications, including template and data. XFA is a superset of XForms. XFA application processor A program which implements all or part of this document, the XFA Specification. DOM (Document Object Model) - a tree-structured set of data as represented internally inside an XFA processor. Although the word "object" suggests an object-oriented programming language, the XFA
DOMs can be implemented in any language. Document order - the order in which the contents of a DOM would appear if written out as an XML document. To traverse a DOM in document order, start at the topmost node and perform a depth-first descent of the tree, descending from each node through its eldest child first, then upon returning to that node descending through the next-eldest child, and so on. XFA Configuration DOM The XFA Configuration DOM provides a set of software interfaces to the data obtained from an XFA configuration document. The XFA Configuration DOM includes sections for all of the different components of XFA, including a section for the data loader. XFA Data DOM The XFA Data DOM provides a set of software interfaces to the data loaded from an XML data document. The data in the XFA Data DOM is in general a subset of the data in the XML data document, but it may also contain other data not present in the XML data document as well as data that originated in the XML data document but has been modified. XFA name A string suitable for identifying an object in an XFA DOM, using the XFA Scripting Object Model syntax. A valid XFA name must be a valid XML name, as defined in the XML specification version 1.0 [XML], with the additional restriction that it must not contain a colon ( : ) character. XFD (XML Form Data) XML representation of the content of a form. XFA can employ any XML data but by convention the name XFD indicates form-specific data. For example, when a user partially fills out a form and saves the partial data as a file, the resulting file is conventionally known as an XFD. XFDF (XML Forms Data Format) XML representations of Adobe PDF annotations. XFT (XFA Template) The filename suffix and preferred namespace prefix for the XFA Template grammar.
Glossary
XFA Specification XML (Extensible Markup Language) XSS (XFA Source Set)
1247
XML (Extensible Markup Language) A grammar for packaging arbitrary data using standard markup elements. XML is intended to be both human- and machine-readable. The controlling specification is [XML1.0], as modified by [XMLNAMES]. XML Data Document Well-formed XML document containing data that is processed by XFA processing applications. Such a document is intended to be processed as data in the context of a form or workflow processing application, such as displaying or printing the data with a form, or manipulating the data via a workflow process.
XML data DOM An XML data DOM provides a set of software interfaces to the data in an XML data document. XMP (XML Metadata) The filename suffix and preferred namespace prefix for XML Metadata, which is an XML representation of PDF metadata. Such metadata includes information about the document and its contents, such as the author's name and keywords, that can be used by search utilities. XSS (XFA Source Set) The filename suffix and preferred namespace prefix for the source set grammar.
Index
!, a SOM naming convention 80 ",", a picture clause symbol 1031 " ", a picture clause symbol 1031 accelerator keys 432 container role 433 speech 433 ADO 408 Adobe.PPKList 485 allowRichText, a template attribute 197 ambient locale See locale anchor point 235, 245 angles 36 APIVersion, an XFA attribute 193, 194 APIVersion, an xfa attribute used in rich text 1057 appearance order 58, 239, 251 append loading 136 Arabic numeral system 1014 arc, a template element layout characteristics 1189 area, a template element 83, 222, 233 layout characteristics 1189 Asian date picture clauses 10201024 date time rules 1014 dates, times and numbers 10121016 eras 1014 numeric picture clauses 10291035 time picture clauses 10261029 assist, a template element 433 attributes, a config element 434, 438 automation objects 327357 order of precedence 353357
$
$$, a picture clause symbol 1030 , a picture clause symbol 1030 $, a picture clause symbol 1030 , a picture clause symbol 1030 $, a SOM naming convention 96, 101 $connectionSet, a SOM naming convention 79 $data, a SOM naming convention 79 $event, a SOM naming convention 79 $form, a SOM naming convention 79 $host, a SOM naming convention 79 $layout, a SOM naming convention 79 $record, a SOM naming convention 79, 80 $template, a SOM naming convention 79
(, a picture clause symbol 1031 , a picture clause symbol 1031 ), a picture clause symbol 1031 , a picture clause symbol 1031
$ $$
&
.
.*, a SOM naming convention 88 .., a SOM naming convention 91
@
[*], a SOM naming convention 89 [+nnn], a SOM naming convention 107 [-nnn], a SOM naming convention 107 [nnn], a SOM naming convention 80
\
\, a SOM naming convention 92
0
0 (zero), a picture clause symbol 1035
9
9, a picture clause symbol 1030, 1036 , a picture clause symbol 1030
A
A, a picture clause symbol 1025, 1035 accelerator keys 432 accessibility 428433
) (
B
background images 229 barcode, a template element 45 layout characteristics 1190 barcodes formatting 45 one-deminsional 47 two-dimensional 47 bibliography 12311239 bind, a template element 162, 181, 452 boilerplate 221 bookend leaders and trailers 274 boolean, a template element 38 border, a template element 226, 259 borders 36 box model 46, 232 growable containers 244 break conditions 237 button 417 button, a template element 417 layout characteristics 1190
1248
XFA Specification Index contentArea, a template element 222, 233, 259 layout characteristics 1191 control 471490 conventions DOM xi FormCalc 906 layout drawings xiii nodes in a tree graph 160 notational x optional terms xii picture clause notation 1018 Unicode xi CR, a picture clause symbol 1031 cr, a picture clause symbol 1031 CreateDate, a property used in XML digital signatures 487 CSS See rich text currencySymbol, a localeSet element 808 currencySymbols, a localeSet element 809 1249
C
calculations 333334 calendar symbols 156 calendarSymbols, a localeSet element 806 canonical format 143, ??901 date 898 date-time 900 number 900 text 901 time 899 canonicalization 139157 See localization certificate authorities 485 certified signature 477 change history 12111227 changes introduced in this version 1199?? check boxes 419 check buttons 419 checkButton, a template element 419 layout characteristics 1190 choice lists 419 multiselect 420 user provided values 420 choiceList, a template element 179, 419 clipping content to fit into a container 51, 236 comments stored in template 59 concealing containers 56 config syntax reference 752 config, an xdp packet 891 Configuration DOM 68, 752 connect, a template element 400, 404 Connection Data DOM 342, 346, 389, 393, 394, 400, 401, 402, 403, 404, 405, 414 connection set 832844 Connection Set Data DOM 69 Connection Set DOM 68 connectionSet, an xdp packet 891 container role 433 container rotation affect on flowed layout 250 containers 22, 31, 221 of fixed content 221 of other containers 33, 222 of variable content 31 physical surfaces and regions 222 content absent 39 requirement for decimal and float types 40 content elements 33 content type data binding 174 content types 3741, 228231 boolean, integer, decimal, and float 38 date, time and dateTime 38 external data 41 image 40, 229 lines, rectangles, and arcs 229 text 38
D
D, a picture clause symbol 1018 , a picture clause symbol 1020 data 24 data binding 159191, 292312 ambiguous matches 170 attributes 182 choice lists 179 content type 174 current connection (web services) 394 data window and global data 220 default bind picture clause 452 direct matches 167 exclusion groups 177 explicit data references 181, 306 form ready event 190 global matches 218 globals 306 greedy matching 304 incremental merge 191 introduction to 2425 nameless fields 176 non-record mode 215 occurrances 296 principles 162 record mode 215 remerge 191 repeated fields or subforms 206238 steps 166 subform set 307 transparent nodes 175 data bindings blank form 302 data description 845853 Data Description DOM 69 data independence 162 data loader 110, 435, 436, 470 data mapping attribute values 129
XFA Specification Index calculations and validations 190 character data 124 data groups 129 document range 118, 436 empty elements 125 excluding data by namespace 439 extended rules 434469 flatten or filter 453 grouping flat stream data 441 image data 133 limiting the range of records 455 mixed content 124 null data 126 overriding attribute loading 438 overriding default empty element handling 447 overriding default handling of inverted XML 451 overriding the data structure 467 range of records considered 455 renaming data elements 462 repeating records 123 rules 118135 specifying data partitioning 456 starting point 463 values containing element content 128 white space 132 data unloader 435, 436 data window 220 datadescription, a dataDescription element 848 dataGroup, an XFA Data DOM object 110, 115 dataNode, an XML data document attribute 434, 467 datasets, an xdp packet 891 dataValue, an XFA Data DOM object 110, 112 date canonical format 898 date format styles 930 datePattern, a localeSet element 810 datePatterns, a localeSet element 811 date-time canonical format 900 date-time widgets 422 dateTimeSymbols, a localeSet element 812 day, a localeSet element 813 dayNames, a localeSet element 814 DB, a picture clause symbol 1031 db, a picture clause symbol 1031 DD, a picture clause symbol 1018 , a picture clause symbol 1020 , a picture clause symbol 1020 , a picture clause symbol 1020 decimal requirement for radix separator 40 decimal, a template element 38 default UI 423 defaults Configuration DOM 753 defualtUi, a template element 423 desc, a template element 59 Description, a property used in XML digital signatures 487 description, a property used in XML digital signatures 487 digital certificates 485 digital signatures 475490 for authenticity 476, 481 for integrity 476, 477, 479 for non-reputiability 476, 481 for usage rights 476, 482 part being signed 477 PDF packaging 477 PDF signatures 490 tracking document changes 477 XDP packaging 477 See also PDF digital signature See also XML digital signatures displayable layout elements 223 Document Object Model See DOMs document range 436 DOM notation xi examples for XFA Data DOM 117 DOMs 6474 and XML 65 hierarchy 64 interactions 71 draw, a template element 221, 229 layout characteristics 1191, 1192 DSA-SHA1 485 dynamic forms compared to static forms 291 data binding 292312 dynamic layout 315326 adhesion 315 break conditions 316 1250
E
E, a picture clause symbol 1018, 1030 , a picture clause symbol 1021, 1030 e, a picture clause symbol 1019 , a picture clause symbol 1021 ECMAScript SOM expressions 94 special characters 94 EEE, a picture clause symbol 1018 EEEE, a picture clause symbol 1018 embed, an xfa attribute used in rich text 1056 embedded objects defined by rich text 44 defined in image elements 229 layout characteristics 1192 embedMode, an xfa attribute used in rich text 1056 embedType, an xfa attribute used in rich text 1056 era, a localeSet element 815 eraNames, a localeSet element 816 escape characters 92 event, a template element 402 events 340353 exclGroup, a template element 32, 177 layout characteristics 1192 excludeNS, a config element 434, 439 exclusion group 32 check buttons 419 exData, a template element 41
e E
DD DD D DD DD
XFA Specification Index execute, a template element 404 extras, a template element 59 operators 910 references 920 SOM 93 string literals 908 support for locale 929 syntactic grammar 910912 time format styles 931 tokens 910 user-defined functions 917 variables 917 white space 907 FormCalc functions Abs() 933 Apr() 957 At() 972 Avg() 934 Ceil() 935 Choose() 967 Concat() 974 Count() 936 CTerm() 958 Date() 943 Date2Num() 944 DateFmt() 945 Decode() 975 Encode() 976 Exists() 968 Floor() 937 Format() 977 FV() 959 Get() 995 HasValue() 969 IPmt() 960 IsoDate2Num() 946 IsoTime2Num() 947 Left() 979 Len() 980 LocaleDateFmt() 948 LocalTimeFmt() 949 Lower() 981 Ltrim() 982 Max() 938 Min() 939 Mod() 940 NPV() 961 Num2Date() 950 Num2GMTime() 951 Num2Time() 952 Oneof() 970 Parse() 983 Pmt() 962 Post() 996 PPmt() 963 Put() 998 PV() 964 Rate() 965 Ref() 999 Replace() 984 Right() 985 Round() 941 1251
F
FFF, a picture clause symbol 1025 , a picture clause symbol 1027 field navigation 428433 field, a template element 31, 40 layout characteristics 1193, 1194, 1195 filename suffix xci 752 fill of closed graphics 37 filter, a template element 485 fixed content 22 float requirement for radix separator 40 float, a template element 38 flowing layout 234 font, a template element 41 Form DOM 69, 159191 formatting data as specified by picture clauses 45 FormCalc 9021001 built-in functions arithmetic 933942 date and time 943956 financial 957966 logical 967971 miscellaneous 9991001 string 972994 URL 995998 case sensitivity 928 comments 907 date and time values 932 date format styles 930 date picture clauses 930 expressions accessors 918 additive 916 assignment 918 block 926 break 923 continue 924 equality 915 for 924 foreach 925 if 924 lists 912 logical and 914 logical or 914 multiplicative 916 primary 917 relational 915 simple 913 unary 916 while 925 lexical grammar 907910 line terminators 907 method calls 928
FFF
XFA Specification Index Rtrim() 986 Space() 987 Str() 988 Stuff() 989 Substr() 990 Sum() 942 Term() 966 Time() 953 Time2Num() 954 TimeFmt() 956 UnitType() 1001 UnitValue() 1000 Upper() 992 Uuid() 991 Within() 971 WordNum() 993 full (date) 930 full XFA 19 1252
I
ifEmpty, a config element 435, 436, 448 image widget 424 image, a template element 40, 229 layout characteristics 1196 imageEdit, a template element 424 images aspect ratio 48 described in draw elements 229 described in field elements 40 mapping 133 provided as data 40 imperial era 1016 imperial eras 1014 incremental merge 191 input parsing 139, 1002 instance manager 311 integer, a template element 38
G
G, a picture clause symbol 1019 g, a picture clause symbol 1020 , a picture clause symbol 1021 gg, a picture clause symbol 1020 , a picture clause symbol 1021 ggg, a picture clause symbol 1020 glossary 12401247 glyph layout characteristics 1196 greedy matching 304 groupelement, a dataDescription element 848 groupParent, a config element 435, 436, 442 growable containers 243 anchor point 245 box model 244 influence on flowed content 249 text placement 245246 GuangXu 1016
J
J, a picture clause symbol 1018 , a picture clause symbol 1020 JavaScript See ECMAScript JJJ, a picture clause symbol 1018 , a picture clause symbol 1020
H
H, a picture clause symbol 1025 , a picture clause symbol 1027 h, a picture clause symbol 1025 , a picture clause symbol 1026 handedness borders and rectangles 226 stroke elements 225 Hangul 1016 Hanja 1016 Heisei 1015 HH, a picture clause symbol 1025 , a picture clause symbol 1027 hh, a picture clause symbol 1025 , a picture clause symbol 1026 , a picture clause symbol 1027 , a picture clause symbol 1026 , a picture clause symbol 1027 , a picture clause symbol 1026 HTTP POST 386
K, a picture clause symbol 1025 , a picture clause symbol 1027 k, a picture clause symbol 1025 , a picture clause symbol 1026 KK, a picture clause symbol 1025 , a picture clause symbol 1027 kk, a picture clause symbol 1025 , a picture clause symbol 1026 , a picture clause symbol 1027 , a picture clause symbol 1026 , a picture clause symbol 1027 , a picture clause symbol 1027
k k kk K KK K k kk KK K kk KK k K
JJJ
K L
gg g h H
layout 23 adhesion 270, 315 anchor point 235 barcodes 47 basic 4658, 232239 break conditions 237, 316 clipping 51, 236 combined leaders and trailers 285 concealing containers 56 container rotation 52 container size requirements 51, 233 content overflow 255 content splitting 255 display surface (pageArea) 233 document order 251 drawing conventions xiii
XFA Specification Index flowing between contentArea objects 259 flowing text within a container 53 geometric figures 233 grouping related objects (area) 233 growable containers and flowed content 249 growable objects 242266 images 48 leaders and trailers 272 locating containers based on data 27, 237 logical grouping of objects (subform) 49 offset vectors 236 page background 238 physical region (contentArea) 233 positioned 246286 print order 252 relative positions 46, 232 repeating sections 237 set of display surfaces (pageSet) 233 strategies 234 text 49 transformations (spacial) 52 widgets 50 See also dynamic layout layout algorithm 253 Layout DOM 70 layout DOM 251 layout elements 223 layout objects 224 characteristics 11891198 layout processor 232, 253 leaders and trailers 272 combined overflow and bookend 285 letterheads 238 line, a template element layout characteristics 1196 locale ambient 141 FormCalc 929 picture clauses 1005 specifying 1006 locale identifiers ar_SA 142 en 142 en_CA 142 en_GB 142 en_GB_EURO 142 fr 143 fr_CA 143 ja 1015 ja_JP 1015 ko 1015 ko_KR 143, 1015 ko_KR_Hani 143 th_TH_TH 143 zh_CN 143, 1016 zh_HK 143, 1016 zh_MO 1016 zh_TW 1016 locale set syntax reference 806 locale, a localeSet element 817 locale, a template element 1005 locale-dependent format 139 localeSet, a localeSet element 154, 819 localeSet, an xdp packet 892 localization 139157 calendar symbols 156 canonical format 143 dataflow paths 147 localeSet 154 picture clauses 144147 prevailing locale 140 rules 150 specifying locale 140 user expectations 139 long (date) 930 1253
M
M, a picture clause symbol 1018, 1025 , a picture clause symbol 1020, 1027 machine-readable schemas 12281230 manifest, a template element 485 mapping See data mapping maxOccur, a dataDescription element 849 measurements 34 medium (date) 930 Meiji 1015 merge. See data binding. meridiem, a localeSet element 820 meridiemNames, a localeSet element 821 metadata stored in template 59 MinGuo 1016 minOccur, a dataDescription element 849 MM, a picture clause symbol 1018, 1025 , a picture clause symbol 1020, 1027 mminOccur, a dataDescription element 849 MMM, a picture clause symbol 1018 , a picture clause symbol 1020, 1027 MMMM, a picture clause symbol 1018 , a picture clause symbol 1021, 1027 model, a dataDescription element 850 month, a localeSet element 822 monthNames, a localeSet element 823
MMMM MMM
MM
M
N
name conflicts 116 nameAttr, a config element 435, 436 names 63 namespaces XML data documents 121 node type information unloading 137 nominal extent 46, 232 notation conventions sourceSet 493 notation for describing contents xi notational conventions x
XFA Specification Index config 493 template 493 null data unloading 137 nullType, a dataDescription element 852 number canonical format 900 numberSymbol, a localeSet element 826 numberSymbols, a localeSet element 827 numeric widget 424 numericEdit, a template element 422, 424 ideographs 1013 imperial eras 1014 limitations 144 literal text 1004 locale identifier 145, 1005 locale-specific 45, 1010, 1012 requirements for numbers 1033 requirements for time 1028 tens rule numeric systems 1014 picture, a config element 435, 452 positioned layout 234, 246286 Predicate 89 presence, a config element 434, 435, 436, 453 prevailing locale 140, 1005 print order 252 proto, a template element 199 prototypes 199 overriding properties 203 1254
O
O (letter), a picture clause symbol 1035 obtaining the value of a SOM expression 94 occur, a template element 213, 260, 296 offset vectors 236 output formatting 139, 1002 outputXSL, a config element 470 overflow leaders and trailers 276 inheritance 282 lists 280
R
range, a config element 435, 455 rawValue 94 rawValue, a form DOM property 452 record mode 215 record, a config element 435, 456 records 115 rectangle, a template element 226 layout characteristics 1197 ref, a template element 486 reference point See anchor point references boilerplate or images 330 prototypes 200 trustability 473 remerge 191 rename, a config element 435, 436, 462 re-normalization 182 repeated fields or subforms 206238 fixed occurrence 213 reqAttrs, a dataDescription element 853 resolveNode(), an XFA DOM method 93 resource consumption managing 215 rich text 43, 10391057 character formatting 1046 consecutive spaces 1054 container elements 1040 converting into plain text 194 CSS color 1039 font 1040 font-family 1040 font-size 1040 font-stretch 1040 font-style 1040 font-weight 1040 line-height 1040 margin 1040
P
page background 238 page coordinates algorithms 1188 pageArea, a template element 222, 233, 238, 259 layout characteristics 1197 pageSet, a template element 223, 233, 260 layout characteristics 1197 para, a template element 41, 42 para, a templete element 42 parsing 139 password, a template element 425 PDF contained within XDP 20 PDF and XFA 17 PDF digital signatures 475 PDF signatures 489, 490 pdf, an xdp packet 892 picture clause 977, 983, 10021038 picture clauses 45 alternate 1010, 1012 Asian date time rules 1014 Asian dates 10201024 Asian dates, times, and numbers 10121016 Asian numbers 10291035 Asian time 10261029 categories date 10181024 null 1037 num 10291035, 10351036 time 10251029 zero 1037 compound 10081009, 1010 context-specific symbols 1003 date requirements 1022 full-width characters 1013 global symbols 1004
XFA Specification Index margin-bottom 1040 margin-left 1040 margin-right 1040 margin-top 1040 tab-align 1040 tab-interval 1040 tab-stop 1040 text-decoration 1040 text-indent 1040 vertical-align 1040 displaying 198 embedded objects 1056 external objects 197 identifying 193 paragraph formatting 1041 properties in XFA Data DOM 194 properties in XFA Template DOM 195 updating in XML Data DOM 197 used for fomatting 192 used to insert external objects 193 user interface 197 version identifiers 193 version specification 1056 XFA Data DOM 194 XHTML b 1039 body 1039 br 1039 html 1039 i 1039 p 1039 span 1039 sup 1039 RSA-SHA1 485 signature, a template element 425 signature, an xdp packet 893 signatures user experience 427 See digital signatures signData, a template element 427, 485 signed forms 475490 SOAP 393 SOM 74108 attributes 84 compound object names 78 conventions 76 current container 96 ECMAScript 94 explicitly named objects 81 expressions that include periods and dashes 92 FormCalc 93 inferred index for ancestors 104 inferred index for peers 102 instance manager 311 interleaved elements 81 internal properties and methods 85 name clashes 86 parent property 91 qualified reference 101 qualified vs unqualified references 101 reference by element class 84 relative index 107 repeated elements 80 resolving unqualified web service data 401 runtime object resolution 93 selecting descendants 91 selecting multiple nodes 88 shortcuts 79 transparent nodes 82 unqualified ancestor references 100 unqualified child references 97 unqualified sibling references 98 value 94 variable elements 108 source set 408, 854883 Source Set DOM 70, 408 and template features 411 sourceSet, a sourceSet element 408 sourceSet, an xdp packet 893 speak a template element 433 spec, an xfa attribute used in rich text 1057 special characters ECMAScript 94 SOM expressions 92 speech 433 speech order 428 speed navigation 432 SS, a picture clause symbol 1025 , a picture clause symbol 1027 , a picture clause symbol 1027 , a picture clause symbol 1027 start element XML data documents 119 startNode, a config element 434, 463 1255
S
s a picture clause symbol 1030 S, a picture clause symbol 1025, 1030 , a picture clause symbol 1027, 1030 , a picture clause symbol 1030 schemas template, connectionSet, sourceSet x scripting Unicode support 364 scripting object model See SOM scripts 23, 358364 automation objects 327 exception handling 363 where executed 359 security 471490 server interactions ADO API 408413 submiting data 386392 web services 393405 short (date) 930 Showa 1015 signature manifest 485 signature widget 425
SS SS S SS SS
s S
XFA Specification Index static forms 206 structural layout elements 223 stylesheet, an xdp packet 893 subform, a template element 33, 49 layout characteristics 1198 subformSet, a template element 307 layout characteristics 1198 submit, a template element 387 submitting data and other form packages 386392 trust 473 drawing conventions 160 trust external references 473 receiving submissions 473 1256
U
ubiquitized documents 482 Unicode 901 notation xi units 35, 1001 unitspan 1000 unload processing 136 uri, a config element 470 URL 995, 998 URL decoded 975 URL encoded 976 user experience 417433 user interface 34 rich text 197 See also widget
T
tabbing order 428 tables 286290 Taisho 1015 Tangun 1015, 1016 template 21, 493751 adding custom information 59 containers 22 creating 25 deprecated features 1226 layout elements 223 modified features 1226 new features 1212 scripts 23 Template DOM 70, 158 template, a template element 33 template, an xdp packet 893 templates unique identification 471 tens rule 1016 tens rule numeric systems 1014 text canonical format 901 text formatting 41??, 231, ??366 alignment and justification 42 bar codes 45 line height 43 other 43 rich text 43 text placement 245246 text, a template element layout characteristics 1198 textEdit, a template element 426 textLocation, a template element 45 time canonical format 899 timePattern, a localeSet element 828 timePatterns, a localeSet element 829 toolTip, a template element 433 tracking templates 471 transform, a config element 437 transformation precedence 437 transformations (spacial) 52 transforms 436 transparent nodes 175 traversal 428 traversal, a template element 429 traverse a template element 429 tree graph
V
V, a picture clause symbol 1031 , a picture clause symbol 1031 v, a picture clause symbol 1031 , a picture clause symbol 1031 validations 334340 value, a form DOM property 452 values 35 variable content 22 variables 330 named script objects 331 variables, a template element 83, 330, 331 views used to hide containers 57
v V w
W
w, a picture clause symbol 1019 , a picture clause symbol 1021 watermark 238 web service message structure 394 web services 393416 web services architecture 395 white space 982, 986, 987 white space handling 132 overriding default behavior 465 whitespace, a config element 435, 436, 465 widgets 50, 417427 button 417 check box 419 check list 419 date-time 422 default 423 image 424 natural size of 50 numeric 424 signature 425
XFA Specification Index text edit 426 widgets. See also user interface. WSDL 393 wsdlConnection, a connectionSet element 400 WW, a picture clause symbol 1019 , a picture clause symbol 1021 See rich text XML data document influence on extended data mapping 434 XML Data DOM 71 changes to 136 logical structures 119 relationship with XFA Data DOM 135 unloading 136 XML data DOM 469 XML decoded 975 XML digital signature properties CreateDate 487 Description 487 description 487 xmp 487 xmpmeta 487 XML digital signatures 475, 482489 digital certificates 485 removing a signature 484 signature manifest 485 signing a form 482 template-provided instructions 485 verifying a signature 484 XML encoded 976 xmp, a property used in XML digital signatures 487 xmpmeta, a property used in XML digital signatures 487 xmpmeta, an xdp packet 896 xsl, a config element 469 XSLT transformations 469470 postprocessing 469 preprocessing 469 XuanTong 1016 1257
Z, a picture clause symbol 1025, 1030 , a picture clause symbol 1030 z, a picture clause symbol 1026, 1030 , a picture clause symbol 1027, 1030 Z-order 58, 239, 251 zz, a picture clause symbol 1026 , a picture clause symbol 1028
Y YY Y Y YY Y Y YYY YY Y
zz
z Z
WW
X
X, a picture clause symbol 1035 xdc, an xdp packet 894 XDP 20 xdp, an xdp packet 894 XFA content elements 33 family of grammars 17 introduction 1529 key features 15 layout objects 224 major components of 2024 names 63 scenarios for use 1517 XFA Config DOM 434469 XFA Configuration DOM 470 influence on extended data mapping 434 XFA Data DOM 70, 109139, 401, 434 changes to 135 dataGroup 110, 115 dataValue 110, 112 logical equivalence 139 properties 111 relationship with XML Data DOM 115 structure 110 updating for choice lists 421 XFA data packaging. See XDP XFA DOM 70 XFA Foreground. See XFAF XFA form fill in 26 processing 27 XFA Form DOM See Form DOM XFA form lifecycle creating an XFA template 25 filling in an XFA form 26 processing an XFA form 27 XFA Template DOM See Template DOM XFAF 19, 22, 25, 27, 28, 30, 31, 41, 46, 49, 60, 61, 221, 237, 418, 493, 1228 xfa-spacerun, a value of CSS style attribute 1054 xfdf, an xdp packet 895 XHTML
Y
Y, a picture clause symbol 1022 , a picture clause symbol 1022 YY, a picture clause symbol 1019 , a picture clause symbol 1022 , a picture clause symbol 1022 YYYY, a picture clause symbol 1019 , a picture clause symbol 1022 , a picture clause symbol 1022