Extensibility-definitions

DSTU2

This page is part of the FHIR Specification (v1.0.2: DSTU 2). The current version which supercedes this version is 5.0.0. For a full list of available versions, see the Directory of published versions . Page versions: R5 R4B R4 R3 R2

1.17.3 Extension - Detailed Descriptions

FHIR Infrastructure

Work Group

Maturity Level: N/A

Ballot Status: DSTU 2

Extension
Definition	Optional Extensions Element - found in all resources.
Control	1..1
Requirements	The ability to add extensions in a structured way is what keeps FHIR resources simple.
Extension.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Control	1..1
Type	uri
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition should be version specific. This will ideally be the URI for the Resource Profile defining the extension, with the code for the extension after a #.
Extension.value[x]
Definition	Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list).
Control	0..1
Type	*
[x] Note	See Choice of Data Types for further information about how to use [x]