assertion  retraction  graph  subject          predicate        object                   datatype    annotation
1          0           graph  obo:CHEBI_25806  rdfs:label       oxygen molecular entity  xsd:string  
1          0           graph  obo:CHEBI_25806  oio:id           CHEBI:25806              xsd:string  
1          0           graph  obo:CHEBI_25806  rdfs:subClassOf  obo:CHEBI_33304          _IRI        
1          0           graph  obo:CHEBI_25806  rdf:type         owl:Class                _IRI