assertion  retraction  graph  subject     predicate        object     datatype    annotation
1          0           graph  DOID:5999   rdfs:subClassOf  DOID:5997  _IRI        
1          0           graph  DOID:5997   oio:id           DOID:5997  xsd:string  
1          0           graph  DOID:10353  rdfs:subClassOf  DOID:5997  _IRI