Abstract

Hybrid knowledge representations that combine description logics with logic programs are considered. Previous works combine description logics with Horn logic programs. In this paper, the expressive power of such hybrid systems is extended by allowing the combination of function-free, non-recursive stratified logic programs with description logics. Tw o model-theoretic definitions for the semantics of the hybrid knowledge representation are presented. It is shown that the inference problem based on the second semantics is decidable. When the logic program is Horn, the two semantics defined in this paper coincide with the semantics in [4] with regard to the inference problem.

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