assertion  retraction  graph  subject    predicate        object     datatype  annotation
1          0           graph  DOID:2670  rdfs:subClassOf  DOID:2615  _IRI      
1          0           graph  DOID:9445  rdfs:subClassOf  DOID:2615  _IRI      
1          0           graph  DOID:3120  rdfs:subClassOf  DOID:2615  _IRI      
1          0           graph  DOID:6562  rdfs:subClassOf  DOID:2615  _IRI