assertion  retraction  graph  subject     predicate        object     datatype    annotation
1          0           graph  DOID:9471   oio:id           DOID:9471  xsd:string  
1          0           graph  DOID:9470   rdfs:subClassOf  DOID:9471  _IRI        
1          0           graph  DOID:10310  rdfs:subClassOf  DOID:9471  _IRI