assertion  retraction  graph  subject     predicate        object   datatype  annotation
1          0           graph  DOID:1459   rdfs:subClassOf  DOID:28  _IRI      
1          0           graph  DOID:10974  rdfs:subClassOf  DOID:28  _IRI      
1          0           graph  DOID:12361  rdfs:subClassOf  DOID:28  _IRI      
1          0           graph  DOID:7188   rdfs:subClassOf  DOID:28  _IRI