assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:7591  rdfs:subClassOf  DOID:5550  _IRI        
1          0           graph  DOID:8336  rdfs:subClassOf  DOID:5550  _IRI        
1          0           graph  DOID:7665  rdfs:subClassOf  DOID:5550  _IRI        
1          0           graph  DOID:5550  oio:id           DOID:5550  xsd:string