assertion  retraction  graph  subject     predicate        object      datatype    annotation
1          0           graph  DOID:7807   rdfs:subClassOf  DOID:12759  _IRI        
1          0           graph  DOID:12759  oio:id           DOID:12759  xsd:string  
1          0           graph  DOID:6438   rdfs:subClassOf  DOID:12759  _IRI