On the Semantics of Epistemic Description Logics

Riccardo Rosati

The modal description logic ACCK both constitutes a promising framework for reasoning about actions and allows for the formalization of several non-first-order aspects of KR systems based on DLs. However, other nonmonotonic features of DL-based KR systems, in particular role and concept closure inside the knowledge base, lack an intuitive formalization in this modal framework. To overcome these difficulties, we propose a modification of the semantics for .ACCIC, which consists in allowing selective minimization of primitive concepts and roles, thus providing for a correct formalization of the notion of role and concept closure.

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