1. Boag, S., Chamberlin, D., Fernandez, M.F., Florescu, D., Robie, J., SimŽon, J.: XQuery 1.0: An XML query language. Technical report, W3C (2003)
2. Dean, M., Connolly, D., Harmelen, F. v., Hendler, J., Horrocks, I., McGuinness, D.L., Patel-Schneider, P.F., Stein, L.A.: Web ontology language (OWL) reference version 1.0 (2002), http://www.w3.org/tr/owl-guide/
3. Fellbaum, C. (ed.): WordNet: An Electronic Lexical Database. MIT Press, Cambridge (1998)
4. Fikes, R., McGuinness, D.L.: An axiomatic semantics for RDF, RDF-S, and DAML+OIL. Technical report, World Wide Web Committee (W3C) Note (2001)
5. Gruber, T.R.: A translation approach to portable ontology specification. Knowledge Acquisition 5, 199–220 (1993)