assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:1039     oio:id           DOID:1039  xsd:string  
1          0           graph  DOID:0081042  rdfs:subClassOf  DOID:1039  _IRI        
1          0           graph  DOID:0081041  rdfs:subClassOf  DOID:1039  _IRI