assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_25698  rdfs:label       ether            xsd:string  
1          0           graph  obo:CHEBI_25698  oio:id           CHEBI:25698      xsd:string  
1          0           graph  obo:CHEBI_25698  rdfs:subClassOf  obo:CHEBI_36963  _IRI        
1          0           graph  obo:CHEBI_25698  rdf:type         owl:Class        _IRI