assertion  retraction  graph  subject          predicate        object           datatype  annotation
1          0           graph  obo:CHEBI_6456   rdfs:subClassOf  obo:CHEBI_29347  _IRI      
1          0           graph  obo:CHEBI_46770  rdfs:subClassOf  obo:CHEBI_29347  _IRI      
1          0           graph  obo:CHEBI_48592  rdfs:subClassOf  obo:CHEBI_29347  _IRI