2019-02-06 UTC
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[tantek] aaronpk, however, I did some digging, your challenge "mf2 does not support an extension mechanism" has at least some surface merit - as in http://microformats.org/wiki/microformats2 nor microformats2-parsing describe an extension mechanism. It's buried here: http://microformats.org/wiki/microformats2-origins#VENDOR_EXTENSIONS as a "Proposal" which means it "exists" but "supports" is debatable from a formal perspective