assertion  retraction  graph  subject     predicate        object     datatype    annotation
1          0           graph  DOID:6293   oio:id           DOID:6293  xsd:string  
1          0           graph  DOID:6291   rdfs:subClassOf  DOID:6293  _IRI        
1          0           graph  DOID:6607   rdfs:subClassOf  DOID:6293  _IRI        
1          0           graph  DOID:13743  rdfs:subClassOf  DOID:6293  _IRI