assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:8130  rdfs:subClassOf  DOID:3610  _IRI        
1          0           graph  DOID:3609  rdfs:subClassOf  DOID:3610  _IRI        
1          0           graph  DOID:3610  oio:id           DOID:3610  xsd:string