assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:5958  oio:id           DOID:5958  xsd:string  
1          0           graph  DOID:5957  rdfs:subClassOf  DOID:5958  _IRI        
1          0           graph  DOID:7244  rdfs:subClassOf  DOID:5958  _IRI