assertion  retraction  graph  subject          predicate        object                datatype    annotation
1          0           graph  obo:CHEBI_33561  rdfs:label       d-block element atom  xsd:string  
1          0           graph  obo:CHEBI_33561  oio:id           CHEBI:33561           xsd:string  
1          0           graph  obo:CHEBI_33561  rdfs:subClassOf  obo:CHEBI_27081       _IRI        
1          0           graph  obo:CHEBI_33561  rdf:type         owl:Class             _IRI