assertion  retraction  graph  subject    predicate        object    datatype    annotation
1          0           graph  DOID:7390  rdfs:subClassOf  DOID:866  _IRI        
1          0           graph  DOID:866   oio:id           DOID:866  xsd:string  
1          0           graph  DOID:4522  rdfs:subClassOf  DOID:866  _IRI        
1          0           graph  DOID:7388  rdfs:subClassOf  DOID:866  _IRI