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(I did not find an appropriate Bugzilla Product/Component for this issue. Hopefully it can be forwarded.) The document "RDFa Core 1.1" (W3C Working Draft 03 August 2010) http://www.w3.org/2010/02/rdfa/drafts/2010/WD-rdfa-core-20100803/ contains this sentence: "The following RDFa Profile document, residing at http://www.example.org/vocab-rdf-dc.html defines the standard RDF prefixes as well as the Dublin Core vocabulary prefix in RDFa." But http://www.example.org/vocab-rdf-dc.html does not exist.
I am the editor on the RDFa Core spec. I have made a change to address this issue - thanks for pointing out that the text implied the example RDFa Profile document actually existed. It was only meant to be a mythical example.
mass-move component to LC1