The Protégé-OWL editor is an extension of Protégé that supports the Web Ontology Language (OWL). OWL is the most recent development in standard ontology languages, endorsed by the World Wide Web Consortium (W3C) to promote the Semantic Web vision. "An OWL ontology may include descriptions of classes, properties and their instances. Given such an ontology, the OWL formal semantics specifies how to derive its logical consequences, i.e. facts not literally present in the ontology, but entailed by the semantics. These entailments may be based on a single document or multiple distributed documents that have been combined using defined OWL mechanisms" (see the OWL Web Ontology Language Guide).

The Protégé-OWL editor enables users to:

• Load and save OWL and RDF ontologies.
• Edit and visualize classes, properties, and SWRL rules.
• Define logical class characteristics as OWL expressions.
• Execute reasoners such as description logic classifiers.
• Edit OWL individuals for Semantic Web markup.

Protégé-OWL's flexible architecture makes it easy to configure and extend the tool. Protégé-OWL is tightly integrated with Jena and has an open-source Java API for the development of custom-tailored user interface components or arbitrary Semantic Web services.

Further documentation about Protégé-OWL is available in the documentation section of the Protégé-OWL Web site, including the popular Protégé OWL Tutorial and the Protégé-OWL FAQ.


View screenshots of Protégé-OWL.

Download Protégé-OWL.

Browse examples of ontologies created in OWL.