assertion  retraction  graph  subject          predicate        object             datatype    annotation
1          0           graph  obo:CHEBI_23906  rdfs:label       monoatomic cation  xsd:string  
1          0           graph  obo:CHEBI_23906  oio:id           CHEBI:23906        xsd:string  
1          0           graph  obo:CHEBI_23906  rdfs:subClassOf  obo:CHEBI_36916    _IRI        
1          0           graph  obo:CHEBI_23906  rdfs:subClassOf  obo:CHEBI_24867    _IRI        
1          0           graph  obo:CHEBI_23906  rdf:type         owl:Class          _IRI