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The conceptual knowledge framework OML/CKML needs several components for asuccessful design. One important, but previously overlooked, component is thecentral core of OML/CKML. The central core provides a theoretical link betweenthe ontological specification in OML and the conceptual knowledgerepresentation in CKML. This paper discusses the formal semantics and syntacticstyles of the central core, and also the important role it plays in defininginteroperability between OML/CKML, RDF/S and Ontolingua.

Conceptual Knowledge Markup Language: The central core