1. Daconta, M.C., Obrst, L.J., Smith, K.T.: The Semantic Web: A Guide to the Future of XML, Web Services, and Knowledge Management. John Wiley & Sons Inc., Chichester (2003)
2. Geroimenko, V.: Dictionary of XML Technologies and the Semantic Web. Springer, Heidelberg (2003)
3. Davies, J., Fensel, D., Van Harmelen, F.: Towards the Semantic Web: Ontol-ogy-Driven Knowledge Management. John Wiley & Sons Inc., Chichester (2003)
4. XML, http://www.w3c.org/TR/xmlschema-2/
5. Brickley, D., Guha, R.V.: RDF Vocabulary Description Language 1.0: RDF Schema, 2002-04-30, W3C Working Draft (2002), http://www.w3.org/TR/rdf-schema