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mex says: /mex:Metadata/mex:MetadataSection/@Dialect This indicates the format and version of the metadata unit contained in this Metadata Section (e.g., WSDL version 1.1). Dialect is an absolute URI. This value should be compared directly, as a case-sensitive string, with no attempt to unescape or to otherwise canonicalize it. Seems like the "should" be a "MUST" (last sentence)
one more: /mex:Metadata/mex:MetadataSection/@Identifier This indicates the Identifier for the metadata unit in this Metadata Section. Identifier is an absolute URI. This value should be compared directly, as a case-sensitive string, with no attempt to unescape or to otherwise canonicalize it. If omitted, there is no implied value.
URI comparisons are performed according to RFC3986 section 6.2.1 add a normative reference in the references section to this rfc