assertion  retraction  graph  subject          predicate        object                       datatype    annotation
1          0           graph  obo:CHEBI_33579  rdfs:label       main group molecular entity  xsd:string  
1          0           graph  obo:CHEBI_33579  oio:id           CHEBI:33579                  xsd:string  
1          0           graph  obo:CHEBI_33579  rdfs:subClassOf  obo:CHEBI_23367              _IRI        
1          0           graph  obo:CHEBI_33579  rdf:type         owl:Class                    _IRI