assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0050865  rdfs:subClassOf  DOID:8649  _IRI        
1          0           graph  DOID:0080641  rdfs:subClassOf  DOID:8649  _IRI        
1          0           graph  DOID:8649     oio:id           DOID:8649  xsd:string