assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0050625  rdfs:subClassOf  DOID:9741  _IRI        
1          0           graph  DOID:4138     rdfs:subClassOf  DOID:9741  _IRI        
1          0           graph  DOID:9741     oio:id           DOID:9741  xsd:string