A Fuzzy Extension of OWL for Vague Knowledge

OWL web ontology language is an official W3C recommendation in ontology language that has recently been developed by the W3C. Although OWL has a powerful expressive ability on knowledge, it has no capability to represent the uncertainty and imprecise information. In the context of Semantic Web and multimedia applications, concepts are rather vague than precise and there are increasing needs to deal with vague knowledge. This paper proposes an extension of OWL DL with fuzzy logic by giving the formal syntax and semantics. The feature of the extension is that it has the ability of capture the vague concepts with the defined modifying operators.