assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0080956  rdfs:subClassOf  DOID:7841  _IRI        
1          0           graph  DOID:7522     rdfs:subClassOf  DOID:7841  _IRI        
1          0           graph  DOID:7841     oio:id           DOID:7841  xsd:string