assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:8564  oio:id           DOID:8564  xsd:string  
1          0           graph  DOID:8883  rdfs:subClassOf  DOID:8564  _IRI        
1          0           graph  DOID:8630  rdfs:subClassOf  DOID:8564  _IRI