Archive For January 2011

Is a class the same as its extent?

on January 14, 2011 by Phillip Lord and Uli Sattler in Articles, Reviewed, Comments (4)

Abstract While it is true that an ontology class defines a set of individuals, its extent, the reverse is not so. The class is not the same as its […]


Closing Down the Open World: Covering Axioms and Closure Axioms

on January 12, 2011 by Robert Stevens in Under Review, Comments (4)

OWL has an open world assumption. This means that just because we don’t say something doesn’t mean it isn’t true. For example, we have an ontology of amino acids […]