Are there OWL ontologies available already?
A. There are a large number of ontologies available on the Web in OWL. There is an ontology library at DAML ontology library, which contains about 250 examples written in OWL or DAML+OIL (a converter from DAML+OIL to OWL is available on the web). In addition, several large ontologies have been released in OWL. These include a cancer ontology in OWL developed by the US National Cancer Institute’s Center for Bioinformatics, which contains about 17,000 cancer related terms and their definitions, and an OWL version of the well-known GALEN medical ontology, developed at the University of Manchester.
