assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:7839  rdfs:subClassOf  DOID:3003  _IRI        
1          0           graph  DOID:3003  oio:id           DOID:3003  xsd:string  
1          0           graph  DOID:7533  rdfs:subClassOf  DOID:3003  _IRI