assertion  retraction  graph  subject     predicate        object      datatype    annotation
1          0           graph  DOID:60007  oio:id           DOID:60007  xsd:string  
1          0           graph  DOID:2626   rdfs:subClassOf  DOID:60007  _IRI        
1          0           graph  DOID:3544   rdfs:subClassOf  DOID:60007  _IRI