1. Martin, D., Burstein, M., Hobbs, J., Lassila, O., McDemott, D., McIlraith, S., Narayanana, S., Paolucci, M., Parsia, B., Payne, T., Sirin, E., Srinivasan, N., Sycara, K.: OWL-S: Semantic markup for web services. Member Submission 22, W3C (November 2004), http://www.w3.org/Submission/2004/SUBM-OWL-S-20041122/
2. Biron, P.V., Malhotra, A. (eds.): XML Schema Part 2: Datatypes (2004), http://www.w3.org/TR/xmlschema-2/
3. Brickley, D., Guha, R.V.: RDF vocabulary description language 1.0: RDF schema. Recommendation, W3C (February 10, 2004), http://www.w3.org/TR/rdf-schema/
4. de Bruijn, J. (ed.): The Web Service Modeling Language WSML, WSMO Final Draft D16.v0.21 (2005), http://www.wsmo.org/TR/d16/d16.1/v0.21/
5. de Bruijn, J., Polleres, A., Lara, R., Fensel, D.: OWL DL vs. OWL Flight: Conceptual modeling and reasoning on the semantic web. In: Proc. WWW 2005, Chiba, Japan (2005)