1. Klyne, G., Carroll, J.J.: Resource description Framework (RDF): Concepts and Abstract Syntax (2004), http://www.w3.org/TR/rdf-concepts/
2. McGuinness, D.L., Van Harmelen, F.: OWL Ontology Language: Overview (2004), http://www.w3.org/TR/owl-features/
3. Horrocks, I., Patel-Schneider, P.F., Boley, H., Tabet, S., Grosof, B., Dean, M.: SWRL: A Semantic Web rule Language: Combining OWL and RuleML (2004), http://www.w3.org/Submission/SWRL/
4. Carroll, J.J., Bizer, C., Hayes, P., Stickler, P.: Named Graph. Provenance and Trust (2005), http://www2005.org/cdrom/docs/p613.pdf
5. http://www.iai-international.org (2007)