assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:3847  rdfs:subClassOf  DOID:3840  _IRI        
1          0           graph  DOID:3846  rdfs:subClassOf  DOID:3840  _IRI        
1          0           graph  DOID:3840  oio:id           DOID:3840  xsd:string