fix for PREFIX : <...> in the prolog
fix for PREFIX : <...> in the prolog

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