assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:8093  rdfs:subClassOf  DOID:1358  _IRI        
1          0           graph  DOID:1358  oio:id           DOID:1358  xsd:string  
1          0           graph  DOID:7868  rdfs:subClassOf  DOID:1358  _IRI