fix for reported bug: http://rdflib.net/pipermail/dev/2007-July/000206.html
fix for reported bug: http://rdflib.net/pipermail/dev/2007-July/000206.html

git-svn-id: 60eb48102d1ca0c284ab3654bef916b01e1b221b@1215 4f84a9ca-5c3e-0410-8a68-0bdf370325d5

nwebs/rdflib