assertion  retraction  graph  subject       predicate        object    datatype    annotation
1          0           graph  DOID:0060004  rdfs:subClassOf  DOID:438  _IRI        
1          0           graph  DOID:438      oio:id           DOID:438  xsd:string  
1          0           graph  DOID:437      rdfs:subClassOf  DOID:438  _IRI        
1          0           graph  DOID:0060033  rdfs:subClassOf  DOID:438  _IRI        
1          0           graph  DOID:0060030  rdfs:subClassOf  DOID:438  _IRI