A Defeasible Logic Reasoner for the Semantic Web

N. Bassiliades, G. Antoniou, I. Vlahavas, “A Defeasible Logic Reasoner for the Semantic Web”, International Journal on Semantic Web and Information Systems, Amit Sheth , Miltiadis D. Lytras (Ed.), IDEA Group Publishing, Vol. 2, No. 1, pp. 1-41, 2006.

defeasible logic, RDF, reasoning, rule markup languages, rules, semantic brokering.

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 ex-ceptions are often used. This paper describes these scenarios in more detail, and reports on the implementation of a system for defeasible reasoning on the Web. The system is called DR-DEVICE and is capable of reasoning about RDF metadata over multiple Web sources using defeasible logic rules. The system 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.