assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:6162  rdfs:subClassOf  DOID:5680  _IRI        
1          0           graph  DOID:5680  oio:id           DOID:5680  xsd:string  
1          0           graph  DOID:8275  rdfs:subClassOf  DOID:5680  _IRI