RDFa 1.1 was published last month and requires namespaces to be serialized in a prefix attribute. This effectively backports the RDFa changes which happened in Drupal 8 at #1077566: Convert html.tpl.php to HTML5.

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#1 1674252_1_framework_rdfa11.patch1.57 KBscor

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scor commented
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new 1674252_1_framework_rdfa11.patch1.57 KB

this patch changes the way the namespace prefixes are declared in HTML using the new prefix attribute.