OWL : Web Ontology Language

RDF and OWL are Semantic Web standards that provide a framework for asset management, enterprise integration and the sharing and reuse of data on the Web.

http://www.w3.org/2001/sw/WebOnt/
Web-Ontology working group in w3c

http://www.w3.org/2004/OWL/
specific OWL website

http://www.w3.org/TR/owl-test/
This document contains and presents test cases for the Web Ontology Language (OWL) approved by the Web Ontology Working Group.

http://www.w3.org/TR/owl-semantics/
Normative descriptoin of the language OWL.

RDF : Ressource Description format, based on XML
OWL : Ontology Web Language, based on XML/RDF