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From http://lists.w3.org/Archives/Public/www-validator/2004Sep/0034.html ''' >I wonder why the validator does not use the actual DTD specified by the >second string but instead performs a phoney validation. I believe this is due to a missing OVERRIDE NO entry preceding the DOCTYPE html "REC-xhtml1-20020801/xhtml1-transitional.dtd" entry in <http://validator.w3.org/sgml-lib/xml.soc>. '''
This should be fixed in CVS HEAD.