assertion  retraction  graph  subject     predicate        object     datatype    annotation
1          0           graph  DOID:12603  rdfs:subClassOf  DOID:1037  _IRI        
1          0           graph  DOID:1037   oio:id           DOID:1037  xsd:string  
1          0           graph  DOID:1040   rdfs:subClassOf  DOID:1037  _IRI