assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0050619  rdfs:subClassOf  DOID:1352  _IRI        
1          0           graph  DOID:1352     oio:id           DOID:1352  xsd:string  
1          0           graph  DOID:1350     rdfs:subClassOf  DOID:1352  _IRI