code: def getValuesForProperty(self, aPropURIRef):
          
          if not type(aPropURIRef) == rdflib.URIRef:
              aPropURIRef = rdflib.URIRef(aPropURIRef)
          return list(self.rdflib_graph.objects(None, aPropURIRef))
docs: generic way to extract some prop value eg
              In [11]: c.getValuesForProperty(rdflib.RDF.type)
              Out[11]:
              [rdflib.term.URIRef(u'http://www.w3.org/2002/07/owl#Class'),
               rdflib.term.URIRef(u'http://www.w3.org/2000/01/rdf-schema#Class')]