摘要: Ontologies are set to play a key role in the “Semantic Web”, extending syntactic interoperability semantic by providing source of shared and precisely defined terms. DAML+OIL is an ontology language specifically designed for use on Web; it exploits existing Web standards (XML RDF), adding familiar ontological primitives object oriented frame based systems, formal rigor very expressive description logic. The logical basis means that reasoning services can be provided, both support design make described resources more accessible automated processes.