Abstract
We present a model for deductive object oriented query languages with inheritance and overriding. In this model, we consider a DAG like dynamic isa hierarchy and we account for both value or attribute inheritance and method inheritance or code sharing. We show that these two types of inheritance can be treated uniformly within an elegant declarative setting. We then propose a novel semantics for the non-monotonic behavior resulting from the combination of overriding, dynamic selfbinding and the dynamic structure of the isa hierarchy. This semantics is reminiscent of the stable model semantics of logic programs with negation. We also isolate a syntactic condition that guarantees the existence of a unique stable model for a program. This condition, in its turn, is inspired by the local stratification condition of perfect model semantics for programs with negation. Finally we define a bottom-up procedure that computes the unique stable model of a stratified program.
Partially supported by “Progetto Finalizzato Sistemi Informatici e Calcolo Parallelo” of C.N.R. grant n. 93.00898.PF69.
Partially supported by grants from the Canadian Commonwealth Scholarship and Fellowship Plan and the University of Dhaka, Bangladesh.
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Bugliesi, M., Jamil, H.M. (1995). A stable model semantics for behavioral inheritance in deductive object oriented languages. In: Gottlob, G., Vardi, M.Y. (eds) Database Theory — ICDT '95. ICDT 1995. Lecture Notes in Computer Science, vol 893. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-58907-4_18
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DOI: https://doi.org/10.1007/3-540-58907-4_18
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