assertion  retraction  graph  subject          predicate        object               datatype    annotation
1          0           graph  obo:CHEBI_25754  rdfs:label       oxo carboxylic acid  xsd:string  
1          0           graph  obo:CHEBI_25754  oio:id           CHEBI:25754          xsd:string  
1          0           graph  obo:CHEBI_25754  rdfs:subClassOf  obo:CHEBI_33575      _IRI        
1          0           graph  obo:CHEBI_25754  rdf:type         owl:Class            _IRI