WS-Mex is now published at the Microsoft site.
The spec is 975 lines long, but I can summarize it for you.
One verb: [get] and three nouns: [schema, wsdl, policy]
Naturally, this took 6 type definitions, 11 messages and 3 operations.
Suddenly: ?WSDL, ?POLICY, ?SCHEMA doesn't look so bad...
They hardcoded in three types of metadata into the spec - isn't there something IRONIC about that???
Oh, the editors are:
Francisco Curbera (Editor), IBM
Jeffrey Schlimmer (Editor), Microsoft