Yesterday morning it was announced to the W3C membership that the Web Services Description Language 2.0 (WSDL 2.0) was officially a standard. WSDL is an XML language for describing web services using an abstract model for service operations. I mentioned a few weeks ago that WSDL had become a Proposed Recommendation, and the final version has come out a few days after the end of the comment period with a small number of minor revisions. You can get all of the parts of the specification at the W3C site.