assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4715  rdfs:subClassOf  DOID:4148  _IRI        
1          0           graph  DOID:4148  oio:id           DOID:4148  xsd:string  
1          0           graph  DOID:7402  rdfs:subClassOf  DOID:4148  _IRI