more tweaks, prefix handleing improvement
more tweaks, prefix handleing improvement

dbs/rdflib,yingerj/rdflib,dbs/rdflib,RDFLib/rdflib,yingerj/rdflib,marma/rdflib,armandobs14/rdflib,marma/rdflib,ssssam/rdflib,ssssam/rdflib,avorio/rdflib,ssssam/rdflib,avorio/rdflib,armandobs14/rdflib,dbs/rdflib,yingerj/rdflib,RDFLib/rdflib,avorio/rdflib,RDFLib/rdflib,armandobs14/rdflib,marma/rdflib,yingerj/rdflib,avorio/rdflib,RDFLib/rdflib,armandobs14/rdflib,ssssam/rdflib,dbs/rdflib,marma/rdflib