bugfix: turtle parser: (do not use the prefix)

before:
<http://semantic-machines.com/veda/veda-schema>
  rdf:type owl:Ontology ;
  rdfs:label "Онтология системы Veda"@ru ;
  rdfs:label "Veda system ontology"@en ;
  owl:imports rdf: ;
  owl:imports rdfs: ;
  owl:imports <http://www.w3.org/2002/07/owl> ;
  owl:versionInfo "1.0" ;

after:

veda-schema:
  rdf:type owl:Ontology ;
  rdfs:label "Онтология системы Veda"@ru ;
  rdfs:label "Veda system ontology"@en ;
  owl:imports rdf: ;
  owl:imports rdfs: ;
  owl:imports <http://www.w3.org/2002/07/owl> ;
  owl:versionInfo "1.0" ;