Semantic Annotations for WSDL
The W3C has created a Semantic Annotations for WSDL Working Group (chaired by Jacek Kopecký, congrats); from the charter:
The objective of the Semantic Annotations for WSDL Working Group is to develop a mechanism to enable annotation of Web services descriptions. This mechanism will take advantage of the WSDL 2.0 extension mechanisms to build a simple and generic support for semantics in Web services.