assertion  retraction  graph  subject     predicate        object     datatype    annotation
1          0           graph  DOID:2917   rdfs:subClassOf  DOID:2916  _IRI        
1          0           graph  DOID:2916   oio:id           DOID:2916  xsd:string  
1          0           graph  DOID:11335  rdfs:subClassOf  DOID:2916  _IRI