| http://www.w3.org/ns/prov#value | - llowing the supposed authorities that you evidently have. *And in learning that system, I honestly do not recall '*didn't used to' being mentioned much if at all (though one can of course find something about it, if not in grammars or grammar courses, then at least in usage manuals and dictionaries), so like I say, whatever instincts I have developed are a product of learning a wider, more generalize
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