assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:7041  rdfs:subClassOf  DOID:4360  _IRI        
1          0           graph  DOID:7040  rdfs:subClassOf  DOID:4360  _IRI        
1          0           graph  DOID:4360  oio:id           DOID:4360  xsd:string