assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4490  rdfs:subClassOf  DOID:1725  _IRI        
1          0           graph  DOID:1725  oio:id           DOID:1725  xsd:string  
1          0           graph  DOID:1788  rdfs:subClassOf  DOID:1725  _IRI        
1          0           graph  DOID:1791  rdfs:subClassOf  DOID:1725  _IRI