assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0060088  oio:id           DOID:0060088  xsd:string  
1          0           graph  DOID:2068     rdfs:subClassOf  DOID:0060088  _IRI        
1          0           graph  DOID:2075     rdfs:subClassOf  DOID:0060088  _IRI