assertion  retraction  graph  subject          predicate        object            datatype    annotation
1          0           graph  obo:CHEBI_36915  rdfs:label       inorganic cation  xsd:string  
1          0           graph  obo:CHEBI_36915  oio:id           CHEBI:36915       xsd:string  
1          0           graph  obo:CHEBI_36915  rdfs:subClassOf  obo:CHEBI_36916   _IRI        
1          0           graph  obo:CHEBI_36915  rdfs:subClassOf  obo:CHEBI_36914   _IRI        
1          0           graph  obo:CHEBI_36915  rdf:type         owl:Class         _IRI