assertion  retraction  graph  subject          predicate        object                      datatype    annotation
1          0           graph  obo:CHEBI_33259  rdfs:label       elemental molecular entity  xsd:string  
1          0           graph  obo:CHEBI_33259  oio:id           CHEBI:33259                 xsd:string  
1          0           graph  obo:CHEBI_33259  rdfs:subClassOf  obo:CHEBI_23367             _IRI        
1          0           graph  obo:CHEBI_33259  rdf:type         owl:Class                   _IRI