A Stable Model Semantics for Behavioral Inheritance in Deductive Object Oriented Languages

We present a model for deductive object oriented query lan guages with inheritance and overriding In this model we consider a DAG like dynamic isa hierarchy and we account for both value or attribute in heritance and method inheritance or code sharing We show that these two types of inheritance can be treated uniformly within an elegant declar ative setting We then propose a novel semantics for the non monotonic behavior resulting from the combination of overriding dynamic self bind ing and the dynamic structure of the isa hierarchy This semantics is reminiscent of the stable model semantics of logic programs with nega tion 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 strati cation condition of perfect model semantics for programs with negation Finally we de ne a bottom up procedure that computes the unique stable model of a strati ed program