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The "http://www.w3.org/2009/09/ws-mex/Dialects/ws-mex-all" Dialect IRI will never appear as the value of @Identifier in a mex:MetadataSection. It is essentially a "selector IRI" that is only used in mex:GetMedata queries. The fact that this IRI is lumped in with the normal Dialect IRI's is the source of some confusion. General Propsal 1: Define "Selector IRI's" as entities that are different from Dilalect URI's and describe their use more accurately. General Proposal 2: Eliminate the need for a special Selector IRI by defining the mex:GetMetadata without a @Dialect value to mean "retrieve all metadata".