assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0060688  rdfs:subClassOf  DOID:6713  _IRI        
1          0           graph  DOID:6713     oio:id           DOID:6713  xsd:string  
1          0           graph  DOID:3454     rdfs:subClassOf  DOID:6713  _IRI        
1          0           graph  DOID:5393     rdfs:subClassOf  DOID:6713  _IRI