assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:6019  rdfs:subClassOf  DOID:3640  _IRI        
1          0           graph  DOID:6017  rdfs:subClassOf  DOID:3640  _IRI        
1          0           graph  DOID:3640  oio:id           DOID:3640  xsd:string  
1          0           graph  DOID:6015  rdfs:subClassOf  DOID:3640  _IRI