assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:2664  rdfs:subClassOf  DOID:1383  _IRI        
1          0           graph  DOID:1383  oio:id           DOID:1383  xsd:string  
1          0           graph  DOID:2095  rdfs:subClassOf  DOID:1383  _IRI