assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4489  rdfs:subClassOf  DOID:1790  _IRI        
1          0           graph  DOID:4488  rdfs:subClassOf  DOID:1790  _IRI        
1          0           graph  DOID:4486  rdfs:subClassOf  DOID:1790  _IRI        
1          0           graph  DOID:1790  oio:id           DOID:1790  xsd:string