assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:6085  oio:id           DOID:6085  xsd:string  
1          0           graph  DOID:6090  rdfs:subClassOf  DOID:6085  _IRI        
1          0           graph  DOID:6089  rdfs:subClassOf  DOID:6085  _IRI