assertion  retraction  graph  subject          predicate        object               datatype    annotation
1          0           graph  obo:CHEBI_64708  rdfs:label       one-carbon compound  xsd:string  
1          0           graph  obo:CHEBI_64708  oio:id           CHEBI:64708          xsd:string  
1          0           graph  obo:CHEBI_64708  rdfs:subClassOf  obo:CHEBI_50860      _IRI        
1          0           graph  obo:CHEBI_64708  rdf:type         owl:Class            _IRI