assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_36914  rdfs:label       inorganic ion    xsd:string  
1          0           graph  obo:CHEBI_36914  oio:id           CHEBI:36914      xsd:string  
1          0           graph  obo:CHEBI_36914  rdfs:subClassOf  obo:CHEBI_24870  _IRI        
1          0           graph  obo:CHEBI_36914  rdfs:subClassOf  obo:CHEBI_24835  _IRI        
1          0           graph  obo:CHEBI_36914  rdf:type         owl:Class        _IRI