assertion  retraction  graph  subject     predicate        object      datatype    annotation
1          0           graph  DOID:60009  oio:id           DOID:60009  xsd:string  
1          0           graph  DOID:3829   rdfs:subClassOf  DOID:60009  _IRI        
1          0           graph  DOID:5048   rdfs:subClassOf  DOID:60009  _IRI