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In Section 5, which discusses the metadata section there is an explanation of the mex dialect. /mex:Metadata/mex:MetadataSection/@Dialect ="http://www.w3.org/2009/02/ws-mex" This value indicates the type of the metadata contained within the Metadata Section. When used in conjunction with Metadata Reference or Location, this allows the inclusion of metadata by reference. This is a bit cryptic. I realize it covers the case where the content is a reference to a metadata section and the refered-to section contains the specific dialect. Recommend adding a few words to clarify.
Proposal: http://lists.w3.org/Archives/Public/public-ws-resource-access/2009Jul/0026.html
Action-84
resolved with the proposal linked through comment #3 in Issue-6720