assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:3447  oio:id           DOID:3447  xsd:string  
1          0           graph  DOID:3446  rdfs:subClassOf  DOID:3447  _IRI        
1          0           graph  DOID:7531  rdfs:subClassOf  DOID:3447  _IRI        
1          0           graph  DOID:3691  rdfs:subClassOf  DOID:3447  _IRI