Fuzzy Extension of OWL Ontology Language

Ontology is intended to provide a formal description of concepts,terms,and relationships within a given knowledge domain.Although ontology has a powerful expressive ability on knowledge,it has no capability to represent the uncertainty and imprecise information.Vague or imprecise information is most important in the context of semantic Web and multimedia applications.This paper proposes an extension of OWL DL with fuzzy logic to deal with the problem.The formal syntax and semantics are presented and an instance shows that fuzzy information can be expressed well in the proposed ontology language.