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Graphical ontology editor, plugin for protege

Collaborative Protégé is an extension of the existing Protégé system that supports collaborative ontology editing as well as annotation of both ontology components and ontology changes.

See also: http://lists.w3.org/Archives/Public/semantic-web/2008Apr/0005.html NaturalOWL is an open-source natural language generation engine written in Java. It produces descriptions of individuals (e.g., items for sale, museum exhibits) and classes (e.g., types of exhibits) in English and Greek from OWL DL ontologies. The ontologies must have been annotated in RDF with linguistic and user modeling resources. We demonstrate a plug-in for Protege that can be used to produce these resources and to generate texts by invoking NaturalOWL. We also demonstrate how NaturalOWL can be used by robotic avatars in Second Life to describe the exhibits of virtual museums. NaturalOWL demonstrates the benefits of Natural Language Generation (NLG) on the Semantic Web. Organizations that need to publish information about objects, such as exhibits or products, can publish OWL ontologies instead of texts. NLG engines, embedded in browsers or Web servers, can then render the ontologies in multiple natural languages, whereas computer programs may access the ontologies directly.

This ontology supports the development of Protégé ontologies using the OntoClean methodology (PDF). This methodology for ontological analysis was developed by N. Guarino and C. Welty. The OntoClean methodology applies the notions used for ontological analysis in philosophy to analyzing conceptual modeling in information systems. If you include this Protégé ontology in your ontology, you can annotate your classes with meta-properties of identity, unity, essence, and dependence. The OntoClean ontology in Protégé also contains constraints in the Protégé Axiom Language (PAL) enabling you to verify whether the ontology is "clean"---does not violate any of the constraints based on these properties.

The Protégé Axiom Language (PAL) extends the Protégé-2000 knowledge modeling environment with support for writing and storing logical constraints and queries about frames in a knowledge base. More than just a language, PAL is a plugin toolset that comprises engines for checking constraints and running queries on knowledge bases, as well as a set of useful user interface components.