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In section B.1 Normative References of the XDM 1.1 spec (http://www.w3.org/TR/xpath-datamodel-11/), the second entry reads, in its entirety: Namespaces in XML ERROR: NO xml-names KNOWN! This may right itself automatically, but it seems worth pointing it out.
I can't explain how that came to be, but it doesn't seem to be the case anymore, I'm happy to say. (That is, the reference works in new builds.)