assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:5349  oio:id           DOID:5349  xsd:string  
1          0           graph  DOID:7945  rdfs:subClassOf  DOID:5349  _IRI        
1          0           graph  DOID:7233  rdfs:subClassOf  DOID:5349  _IRI