assertion  retraction  graph  subject    predicate        object    datatype    annotation
1          0           graph  DOID:479   rdfs:subClassOf  DOID:471  _IRI        
1          0           graph  DOID:4028  rdfs:subClassOf  DOID:471  _IRI        
1          0           graph  DOID:471   oio:id           DOID:471  xsd:string  
1          0           graph  DOID:470   rdfs:subClassOf  DOID:471  _IRI