6Sean Bechhofer, lan Horrocks, Carole Goble, Robert Stevens. OILEd: a Reason-able Ontology Editor for the Semantic Web [ C ]. Proceedings of KI2001, Joint German/Austrian conference on Artificial Intelligence, September 19-21, Vienna. Springer-Verlag LNAI Vol. 2174, pp 396-408. 2001.