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The page http://www.student.lu.se/~lak04vlo is validated without warnings even though no XML namespace is declared. Gecko based browsers refuse to parse it, though.
Sorry, the end of the URL got cut off. It's supposed to be http://www.student.lu.se/~lak04vlo/noxmlns.xhtml
Vincent, thanks for your bug report. This appears to be a duplicate of a known bug, so I am consolidating the two in one. *** This bug has been marked as a duplicate of bug 68 ***