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Schema.org using microdata shows an RDF which makes sense (e.g. the URIs are correctly the same as those poposed on schema.org)see http://schema.org/docs/datamodel.html the RDFa example (just convert it to rdf) but if the proposed algorithm is used the URIS would be really strange and incompatible with these. "http://www.w3.org/1999/xhtml/microdata#http://example.com/a%23:q%20r". it is really important to fix this algorithm since we do need implementations asap also driven by schema.org
From http://schema.org/docs/datamodel.html it doesn't look like they are using microdata at all. See also http://www.w3.org/Bugs/Public/show_bug.cgi?id=12713
*** This bug has been marked as a duplicate of bug 12713 ***