assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:8083  rdfs:subClassOf  DOID:4773  _IRI        
1          0           graph  DOID:8082  rdfs:subClassOf  DOID:4773  _IRI        
1          0           graph  DOID:4773  oio:id           DOID:4773  xsd:string