assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0080879  oio:id           DOID:0080879  xsd:string  
1          0           graph  DOID:0080684  rdfs:subClassOf  DOID:0080879  _IRI        
1          0           graph  DOID:0080880  rdfs:subClassOf  DOID:0080879  _IRI