assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:5236  rdfs:subClassOf  DOID:2431  _IRI        
1          0           graph  DOID:2431  oio:id           DOID:2431  xsd:string  
1          0           graph  DOID:2430  rdfs:subClassOf  DOID:2431  _IRI        
1          0           graph  DOID:5233  rdfs:subClassOf  DOID:2431  _IRI