“ It is also important to note that, similarly to schema.org, Facebook has also updated its pages for Webmasters on the Open Graph Protocol to use RDFa 1.1. (That was done even before the publication of RDFa 1.1 as a standard!)
Schema.org, OGP, and RDFa 1.1… | Semantic Web Activity News
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a personal flow of consciousness - by - Matteo Brunati
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in italian on dagoneye.it
