assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_33250  rdfs:label       atom             xsd:string  
1          0           graph  obo:CHEBI_33250  oio:id           CHEBI:33250      xsd:string  
1          0           graph  obo:CHEBI_33250  rdfs:subClassOf  obo:CHEBI_24431  _IRI        
1          0           graph  obo:CHEBI_33250  rdf:type         owl:Class        _IRI