1. Berners-Lee, T., Hendler, J., Lassila, O.: The semantic Web. Scientific American 284(5), 34–43 (2001)
2. Brickley, D., Guha, R.V. (eds.): Resource description framework (RDF) schema specification 1.0. W3C Recommendation (March 2000), http://www.w3.org/TR/2000/CR-rdf-schema-20000327/
3. Lecture Notes in Computer Science;J. Broekstra,2002
4. Dean, M., Schreiber, G., van Harmelen, F., Hendler, J., Horrocks, I., McGuinness, D.L., Patel-Schneider, P.F., Stein, L.A.: OWL web ontology language reference. Working draft, W3C (March 2003)
5. Demoen, B.: Dynamic attributes, their hProlog implementation, and a first evaluation. Report CW 350, Department of Computer Science, K.U.Leuven, Leuven, Belgium (October 2002), URL = http://www.cs.kuleuven.ac.be/publicaties/rapporten/cw/CW350.abs.html