assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0081245  rdfs:subClassOf  DOID:4847  _IRI        
1          0           graph  DOID:4847     oio:id           DOID:4847  xsd:string  
1          0           graph  DOID:4846     rdfs:subClassOf  DOID:4847  _IRI