assertion  retraction  graph  subject     predicate        object      datatype    annotation
1          0           graph  DOID:60001  oio:id           DOID:60001  xsd:string  
1          0           graph  DOID:5547   rdfs:subClassOf  DOID:60001  _IRI        
1          0           graph  DOID:9477   rdfs:subClassOf  DOID:60001  _IRI