Document Type

Conference Proceeding

Publication Date

10-1-2009

Abstract

Nonmonotonic extensions of description logics (DLs) allow for default and local closed-world reasoning and are an acknowledged desired feature for applications, e.g. in the Semantic Web. A recent approach to such an extension is based on McCarthy's circumscription, which rests on the principle of minimising the extension of selected predicates to close off dedicated parts of a domain model. While decidability and complexity results have been established in the literature, no practical algorithmisation for circumscriptive DLs has been proposed so far. In this paper, we present a tableaux calculus that can be used as a decision procedure for concept satisfiability with respect to concept circumscribed ALCO knowledge bases. The calculus builds on existing tableaux for classical DLs, extended by the notion of a preference clash to detect the non-minimality of constructed models.

Comments

Presented at the Third International Conference on Web Reasoning and Rule Systems, Chantilly, VA, October 25-26, 2009.

Attached is the unpublished, authors' version of this proceeding. The final, publisher's version is available at http://dx.doi.org/10.1007/978-3-642-05082-4_4.

DOI

10.1007/978-3-642-05082-4_4