assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:5727  oio:id           DOID:5727  xsd:string  
1          0           graph  DOID:3700  rdfs:subClassOf  DOID:5727  _IRI        
1          0           graph  DOID:7514  rdfs:subClassOf  DOID:5727  _IRI