assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0080741  rdfs:subClassOf  DOID:9588  _IRI        
1          0           graph  DOID:646      rdfs:subClassOf  DOID:9588  _IRI        
1          0           graph  DOID:9588     oio:id           DOID:9588  xsd:string