assertion  retraction  graph  subject          predicate        object                     datatype    annotation
1          0           graph  obo:CHEBI_35951  rdfs:label       dioxo monocarboxylic acid  xsd:string  
1          0           graph  obo:CHEBI_35951  oio:id           CHEBI:35951                xsd:string  
1          0           graph  obo:CHEBI_35951  rdfs:subClassOf  obo:CHEBI_35871            _IRI        
1          0           graph  obo:CHEBI_35951  rdf:type         owl:Class                  _IRI