assertion  retraction  graph  subject           predicate        object            datatype  annotation
1          0           graph  obo:SYMP_0019161  rdfs:subClassOf  obo:SYMP_0000099  _IRI      
1          0           graph  obo:SYMP_0000504  rdfs:subClassOf  obo:SYMP_0000099  _IRI      
1          0           graph  obo:SYMP_0000576  rdfs:subClassOf  obo:SYMP_0000099  _IRI