assertion  retraction  graph  subject    predicate        object    datatype    annotation
1          0           graph  DOID:712   oio:id           DOID:712  xsd:string  
1          0           graph  DOID:711   rdfs:subClassOf  DOID:712  _IRI        
1          0           graph  DOID:7936  rdfs:subClassOf  DOID:712  _IRI        
1          0           graph  DOID:9544  rdfs:subClassOf  DOID:712  _IRI