assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4908  oio:id           DOID:4908  xsd:string  
1          0           graph  DOID:3447  rdfs:subClassOf  DOID:4908  _IRI        
1          0           graph  DOID:5525  rdfs:subClassOf  DOID:4908  _IRI        
1          0           graph  DOID:4284  rdfs:subClassOf  DOID:4908  _IRI