assertion  retraction  graph  subject          predicate        object                   datatype    annotation
1          0           graph  obo:CHEBI_26712  rdfs:label       sodium molecular entity  xsd:string  
1          0           graph  obo:CHEBI_26712  oio:id           CHEBI:26712              xsd:string  
1          0           graph  obo:CHEBI_26712  rdfs:subClassOf  obo:CHEBI_33296          _IRI        
1          0           graph  obo:CHEBI_26712  rdf:type         owl:Class                _IRI