assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:219      rdfs:subClassOf  DOID:9256  _IRI        
1          0           graph  DOID:0080199  rdfs:subClassOf  DOID:9256  _IRI        
1          0           graph  DOID:1993     rdfs:subClassOf  DOID:9256  _IRI        
1          0           graph  DOID:9256     oio:id           DOID:9256  xsd:string