assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:5604     oio:id           DOID:5604  xsd:string  
1          0           graph  DOID:5602     rdfs:subClassOf  DOID:5604  _IRI        
1          0           graph  DOID:0060592  rdfs:subClassOf  DOID:5604  _IRI