assertion  retraction  graph  subject          predicate        object                                datatype    annotation
1          0           graph  obo:CHEBI_38101  rdfs:label       organonitrogen heterocyclic compound  xsd:string  
1          0           graph  obo:CHEBI_38101  oio:id           CHEBI:38101                           xsd:string  
1          0           graph  obo:CHEBI_38101  rdfs:subClassOf  obo:CHEBI_35352                       _IRI        
1          0           graph  obo:CHEBI_38101  rdfs:subClassOf  obo:CHEBI_24532                       _IRI        
1          0           graph  obo:CHEBI_38101  rdf:type         owl:Class                             _IRI