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Section 3.1 Document Conformance defines the requirements for a conforming document. Somewhat surprisingly, this does not include a requirement that HTML+RDFa / XHTML+RDFa attributes are used in a way that is conforming with those specifications.
RDFA-SPEC-SECTIONS [document-conformance]
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the tracker issue; or you may create a tracker issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Fixed Change Description: Added new Document conformance requirement: http://dev.w3.org/html5/rdfa/drafts/ED-rdfa-in-html-20100502/#document-conformance "All HTML5 elements and attributes must be used in a way that is conformant with [HTML5]. All RDFa attributes must be used in a way that is conformant with [RDFA-CORE] and this document." Rationale: Submitter is correct, we should make it clear that authors SHOULD use the combination of HTML5 and RDFa attributes for the purposes for which they were intended. I stopped short of stating MUST because if we would've made this requirement on the class="" attribute, Microformats would have been a non-conforming use of HTML4.
Diff-marked version: http://dev.w3.org/html5/rdfa/drafts/ED-rdfa-in-html-20100502/diff-20100304.html#document-conformance
mass-move component to LC1