assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:6084  rdfs:subClassOf  DOID:2156  _IRI        
1          0           graph  DOID:5567  rdfs:subClassOf  DOID:2156  _IRI        
1          0           graph  DOID:2156  oio:id           DOID:2156  xsd:string  
1          0           graph  DOID:2155  rdfs:subClassOf  DOID:2156  _IRI