assertion  retraction  graph  subject          predicate        object                     datatype    annotation
1          0           graph  obo:CHEBI_33362  rdfs:label       nickel group element atom  xsd:string  
1          0           graph  obo:CHEBI_33362  oio:id           CHEBI:33362                xsd:string  
1          0           graph  obo:CHEBI_33362  rdfs:subClassOf  obo:CHEBI_33561            _IRI        
1          0           graph  obo:CHEBI_33362  rdf:type         owl:Class                  _IRI