assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:2155  oio:id           DOID:2155  xsd:string  
1          0           graph  DOID:6331  rdfs:subClassOf  DOID:2155  _IRI        
1          0           graph  DOID:5550  rdfs:subClassOf  DOID:2155  _IRI        
1          0           graph  DOID:5351  rdfs:subClassOf  DOID:2155  _IRI