assertion  retraction  graph  subject          predicate        object                    datatype    annotation
1          0           graph  obo:CHEBI_33675  rdfs:label       p-block molecular entity  xsd:string  
1          0           graph  obo:CHEBI_33675  oio:id           CHEBI:33675               xsd:string  
1          0           graph  obo:CHEBI_33675  rdfs:subClassOf  obo:CHEBI_33579           _IRI        
1          0           graph  obo:CHEBI_33675  rdf:type         owl:Class                 _IRI