assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:656   rdfs:subClassOf  DOID:9553  _IRI        
1          0           graph  DOID:3953  rdfs:subClassOf  DOID:9553  _IRI        
1          0           graph  DOID:3952  rdfs:subClassOf  DOID:9553  _IRI        
1          0           graph  DOID:9553  oio:id           DOID:9553  xsd:string