get_by and filter_by will now work for inherited classes This adds _getdescriptor to rdfObject and fixes ticket:9
get_by and filter_by will now work for inherited classes
This adds _getdescriptor to rdfObject and fixes ticket:9

--HG--
extra : convert_revision : svn%3A9283dc3d-0829-0410-a9a8-f2d03961dc1a/rdfalchemy/trunk%4089

gjhiggins/RDFAlchemy