2015-04-29 UTC
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@kevinmarks @LeaVerou @tommorris clarified this: http://microformats.org/wiki/index.php?title=microformats2-prefixes&diff=64932&oldid=48175&rcid=101308 - obviously you can't write a parser for as yet unspecified type prefixes (twitter.com/_/status/593362679269462016)