assertion  retraction  graph  subject     predicate        object      datatype    annotation
1          0           graph  DOID:11239  rdfs:subClassOf  DOID:60000  _IRI        
1          0           graph  DOID:60000  oio:id           DOID:60000  xsd:string  
1          0           graph  DOID:5146   rdfs:subClassOf  DOID:60000  _IRI