assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0060123  rdfs:subClassOf  DOID:0060099  _IRI        
1          0           graph  DOID:0060099  oio:id           DOID:0060099  xsd:string  
1          0           graph  DOID:461      rdfs:subClassOf  DOID:0060099  _IRI