assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_28112  rdfs:label       nickel atom      xsd:string  
1          0           graph  obo:CHEBI_28112  oio:id           CHEBI:28112      xsd:string  
1          0           graph  obo:CHEBI_28112  rdfs:subClassOf  obo:CHEBI_88184  _IRI        
1          0           graph  obo:CHEBI_28112  rdfs:subClassOf  obo:CHEBI_33362  _IRI        
1          0           graph  obo:CHEBI_28112  rdf:type         owl:Class        _IRI