ExcuseMe?, Earle. Let me ApologizeFirst for disturbing the harmony of this page that you last edited and created 1.5 years ago. Can you, or someone else having interests in SemanticWeb, tell me what relationship exists between OWL and "Ontology Markup Language" (see http://www.ontologos.org/ and http://www.semanticweb.org/knowmarkup.html BrokenLink 200071212). Also I am interested in how OWL can be described as a VocabularyExtension to RDF (see http://en.wikipedia.org/wiki/Web_Ontology_Language) -- dl Dec2004
OntoClean provides a discussion of metaproperties for the building of ontology in languages such as OWL.