Knowledge Compilation for Description Logics

Abstract. Knowledge compilation is a common technique for propositional logic knowledge bases. The idea is to transform a given knowledge base into a special normal form ([MR03],[DH05]), for which queries can be answered efficiently. This precompilation step is very expensive but it only has to be performed once. We propose to apply this technique to knowledge bases defined in Description Logics. For this, we introduce a normal form, called linkless concept descriptions, for ALC concepts. Further we present an algorithm, based on path dissolution, which can be used to transform a given concept description into an equivalent linkless concept description. Finally we discuss a linear satisfiability test as well as a subsumption test for linkless concept descriptions.

• Type: Conference
• Year: 2007
• Where: KI
• Authors: Ulrich Furbach, Claudia Obermaier
• Keywords: KI 2007, Knowledge Bases, Linkless Concept Descriptions, Normal Form