assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:1906  rdfs:subClassOf  DOID:5274  _IRI        
1          0           graph  DOID:7639  rdfs:subClassOf  DOID:5274  _IRI        
1          0           graph  DOID:5274  oio:id           DOID:5274  xsd:string