assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:7428  rdfs:subClassOf  DOID:1660  _IRI        
1          0           graph  DOID:6856  rdfs:subClassOf  DOID:1660  _IRI        
1          0           graph  DOID:1660  oio:id           DOID:1660  xsd:string  
1          0           graph  DOID:5510  rdfs:subClassOf  DOID:1660  _IRI        
1          0           graph  DOID:5553  rdfs:subClassOf  DOID:1660  _IRI        
1          0           graph  DOID:5341  rdfs:subClassOf  DOID:1660  _IRI