assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:784   rdfs:subClassOf  DOID:1074  _IRI        
1          0           graph  DOID:4676  rdfs:subClassOf  DOID:1074  _IRI        
1          0           graph  DOID:1074  oio:id           DOID:1074  xsd:string