assertion  retraction  graph  subject     predicate        object    datatype    annotation
1          0           graph  DOID:12756  rdfs:subClassOf  DOID:292  _IRI        
1          0           graph  DOID:294    rdfs:subClassOf  DOID:292  _IRI        
1          0           graph  DOID:292    oio:id           DOID:292  xsd:string