A Defeasible Logic Reasoner for the Semantic Web

Nick Bassiliades, Grigoris Antoniou and Ioannis Vlahavas
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Nick Bassiliades: Aristotle University of Thessaloniki, Greece
Grigoris Antoniou: F.O.R.T.H., Greece
Ioannis Vlahavas: Aristotle University of Thessaloniki, Greece

International Journal on Semantic Web and Information Systems (IJSWIS), 2006, vol. 2, issue 1, 1-41

Abstract: Defeasible reasoning is a rule-based approach for efficient reasoning with incomplete and inconsistent information. Such reasoning is, among others, useful for ontology integration, where conflicting information arises naturally; and for the modeling of business rules and policies, where rules with exceptions are often used. This paper describes these scenarios and reports on the implementation of a system for defeasible reasoning on the Web. The system, DR-DEVICE, is capable of reasoning about RDF metadata over multiple Web sources using defeasible logic rules. It is implemented on top of CLIPS production rule system and builds upon R-DEVICE, an earlier deductive rule system over RDF metadata that also supports derived attribute and aggregate attribute rules. Rules can be expressed either in a native CLIPS-like language, or in an extension of the OO-RuleML syntax. The operational semantics of defeasible logic are implemented through compilation into the generic rule language of R-DEVICE. The paper also presents a full semantic Web broker example for apartment renting.

Date: 2006
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