assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:5917  rdfs:subClassOf  DOID:5916  _IRI        
1          0           graph  DOID:5916  oio:id           DOID:5916  xsd:string  
1          0           graph  DOID:5915  rdfs:subClassOf  DOID:5916  _IRI