assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4869  rdfs:subClassOf  DOID:2600  _IRI        
1          0           graph  DOID:2876  rdfs:subClassOf  DOID:2600  _IRI        
1          0           graph  DOID:2600  oio:id           DOID:2600  xsd:string