assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_25000  rdfs:label       lactone          xsd:string  
1          0           graph  obo:CHEBI_25000  oio:id           CHEBI:25000      xsd:string  
1          0           graph  obo:CHEBI_25000  rdfs:subClassOf  obo:CHEBI_38104  _IRI        
1          0           graph  obo:CHEBI_25000  rdfs:subClassOf  obo:CHEBI_33308  _IRI        
1          0           graph  obo:CHEBI_25000  rdf:type         owl:Class        _IRI