assertion  retraction  graph  subject     predicate        object     datatype    annotation
1          0           graph  DOID:9351   rdfs:subClassOf  DOID:4194  _IRI        
1          0           graph  DOID:11716  rdfs:subClassOf  DOID:4194  _IRI        
1          0           graph  DOID:4194   oio:id           DOID:4194  xsd:string