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"The doctype declaration is <!DOCTYPE html> and is case-insensitive in the HTML syntax." - this sounds like <!DOCTYPE html> is "the" doctype declaration also in XML, but the XML syntax has no requirements at all wrt which doctype to use, so that's a bit misleading. It should say that that's the doctype for the HTML syntax, and that the XML syntax can use any or no doctype.
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: Accepted Change Description: http://dev.w3.org/cvsweb/html5/html4-differences/Overview.src.html.diff?r1=1.194;r2=1.195 Rationale: Concurred with reporter's comments