assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4813  rdfs:subClassOf  DOID:4202  _IRI        
1          0           graph  DOID:4202  oio:id           DOID:4202  xsd:string  
1          0           graph  DOID:4860  rdfs:subClassOf  DOID:4202  _IRI