assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4547  rdfs:subClassOf  DOID:4545  _IRI        
1          0           graph  DOID:4546  rdfs:subClassOf  DOID:4545  _IRI        
1          0           graph  DOID:4545  oio:id           DOID:4545  xsd:string