During the OGSA EAP session on the Oct 19^th, we discussed the possible use of WS-MetadataExchange (MEX) as a way of exchanging a services’ communication security policy encoded in WS-SecurityPolicy. The status of the MEX specification was raised. 

I have confirmed that MEX is not yet in a standards body. 

There are however, a fairly large number of implementations of the published specification  (“Web Services Metadata Exchange (WS-MetadataExchange)”, Version 1.1, August 2006) co-authored by Microsoft, Sun Microsystems, IBM, SAP, BEA, Computer Associates, and webMethods.  Implementers include Microsoft, IBM, Oracle, Sun, Adobe, and open source AXIS.

Regards,

Blair Dillaway