W3C is pleased to announce the advancement of “Semantic Annotations for WSDL and XML Schema” to Candidate Recommendation. With these attributes, semantic annotations can be added to Web Services Description Language (WSDL) components for use in classifying, discovering, matching, composing, and invoking Web services. The group also released an updated Working Draft of the companion “Usage Guide.”
http://www.w3.org/TR/2007/CR-sawsdl-20070126/
http://www.w3.org/TR/2007/WD-sawsdl-guide-20070126/
http://www.w3.org/2002/ws/