assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_23888  rdfs:label       drug             xsd:string  
1          0           graph  obo:CHEBI_23888  oio:id           CHEBI:23888      xsd:string  
1          0           graph  obo:CHEBI_23888  rdfs:subClassOf  obo:CHEBI_52217  _IRI        
1          0           graph  obo:CHEBI_23888  rdf:type         owl:Class        _IRI