assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:6933  rdfs:subClassOf  DOID:5432  _IRI        
1          0           graph  DOID:6239  rdfs:subClassOf  DOID:5432  _IRI        
1          0           graph  DOID:5432  oio:id           DOID:5432  xsd:string