assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_64709  rdfs:label       organic acid     xsd:string  
1          0           graph  obo:CHEBI_64709  oio:id           CHEBI:64709      xsd:string  
1          0           graph  obo:CHEBI_64709  rdfs:subClassOf  obo:CHEBI_50860  _IRI        
1          0           graph  obo:CHEBI_64709  rdf:type         owl:Class        _IRI