assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_24870  rdfs:label       ion              xsd:string  
1          0           graph  obo:CHEBI_24870  oio:id           CHEBI:24870      xsd:string  
1          0           graph  obo:CHEBI_24870  rdfs:subClassOf  obo:CHEBI_23367  _IRI        
1          0           graph  obo:CHEBI_24870  rdf:type         owl:Class        _IRI