assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:3723  rdfs:subClassOf  DOID:3721  _IRI        
1          0           graph  DOID:3722  rdfs:subClassOf  DOID:3721  _IRI        
1          0           graph  DOID:3721  oio:id           DOID:3721  xsd:string  
1          0           graph  DOID:3720  rdfs:subClassOf  DOID:3721  _IRI