Hi Tantek,
the current situation for validity of Dublin Core in HTML5 is a bit
strange (*).
The WhatWG Wiki allows dcterms:*, and validator.nu accepts them.
The Microformats Wiki appears to have the same information, labeled as
"proposed".
Both ask for a link relation of "schema.dcterms", but that one doesn't
seem to be supported by the Validator, nor by the Microformats Wiki.
So there's minimally an inconsistency here.
Best regards, Julian
(*)
https://validator.nu/?doc=http%3A%2F%2Fgreenbytes.de%2Ftech%2Fwebdav%2Ftestcase.html