1. RDF Primer, W3C Recommendation. Tech. rep., W3C (February 10, 2004)
2. RDF Vocabulary Description Language 1.0: RDF Schema. Tech. rep., W3C (2004)
3. RDF/XML Syntax Specification. Tech. rep., W3C (2004)
4. Abiteboul, S., Buneman, P., Suciu, D.: Data on the Web – from Relations to Semistructured Data and XML. Morgan Kaufmann, New York (2000)
5. Abiteboul, S.: Querying Semi-Structured Data. In: Proceedings of the 6th International Conference on Database Theory, pp. 1–18. Springer, London (1997)