See: http://lists.w3.org/Archives/Public/public-grddl-wg/2007Apr/0166.html
See: http://lists.w3.org/Archives/Public/public-grddl-wg/2007Apr/0166.html

apparently xml:base='' should be treated as a no-op or at least resolved relative to the base URI given by publicID

git-svn-id: 60eb48102d1ca0c284ab3654bef916b01e1b221b@1117 4f84a9ca-5c3e-0410-8a68-0bdf370325d5

nwebs/rdflib