assertion  retraction  graph  subject           predicate        object            datatype  annotation
1          0           graph  obo:SYMP_0000517  rdfs:subClassOf  obo:SYMP_0000514  _IRI      
1          0           graph  obo:SYMP_0000614  rdfs:subClassOf  obo:SYMP_0000514  _IRI      
1          0           graph  obo:SYMP_0000598  rdfs:subClassOf  obo:SYMP_0000514  _IRI