Query Answering for OWL-DL with Rules


Both OWL-DL and function-free Horn rules are decidable fragments of first-order logic with interesting, yet orthogonal expressive power. A combination of OWL-DL and rules is desirable for the Semantic Web; however, it might easily lead to the undecidability of interesting reasoning problems. Here, we present a decidable such combination where rules are required to be DL-safe: each variable in the rule is required to occur in a non-DL-atom in the rule body. We discuss the expressive power of such a combination and present an algorithm for query answering in the related logic SHIQ extended with DL-safe rules, based on a reduction to disjunctive programs.

DOI: 10.1007/978-3-540-30475-3_38

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@article{Motik2004QueryAF, title={Query Answering for OWL-DL with Rules}, author={Boris Motik and Ulrike Sattler and Rudi Studer}, journal={J. Web Sem.}, year={2004}, volume={3}, pages={41-60} }