assertion  retraction  graph  subject          predicate        object                      datatype    annotation
1          0           graph  obo:CHEBI_33304  rdfs:label       chalcogen molecular entity  xsd:string  
1          0           graph  obo:CHEBI_33304  oio:id           CHEBI:33304                 xsd:string  
1          0           graph  obo:CHEBI_33304  rdfs:subClassOf  obo:CHEBI_33675             _IRI        
1          0           graph  obo:CHEBI_33304  rdf:type         owl:Class                   _IRI