assertion  retraction  graph  subject          predicate        object              datatype    annotation
1          0           graph  obo:CHEBI_59999  rdfs:label       chemical substance  xsd:string  
1          0           graph  obo:CHEBI_59999  oio:id           CHEBI:59999         xsd:string  
1          0           graph  obo:CHEBI_59999  rdfs:subClassOf  obo:CHEBI_24431     _IRI        
1          0           graph  obo:CHEBI_59999  rdf:type         owl:Class           _IRI