This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
If forcing Doctype to HTML5, the validator switches to HTML5 mode, which is != XML, hence triggering some warnings such as Namespace Found in non-XML Document. e.g: http://qa-dev.w3.org/wmvs/HEAD/check?uri=http%3A%2F%2Fwww.w3.org%2F&doctype=HTML5 These warnings should be filtered out, since HTML5 mode covers both XML and non-XML. Implementation: either change from the model of "mode" being TBD, SGML, XML or HTML5, or change the triggers for the warning.
fixed in dev. http://lists.w3.org/Archives/Public/www-validator-cvs/2008Aug/0079.html