assertion  retraction  graph  subject          predicate        object                datatype    annotation
1          0           graph  obo:CHEBI_53444  rdfs:label       potassium dichromate  xsd:string  
1          0           graph  obo:CHEBI_53444  oio:id           CHEBI:53444           xsd:string  
1          0           graph  obo:CHEBI_53444  rdfs:subClassOf  obo:CHEBI_26218       _IRI        
1          0           graph  obo:CHEBI_53444  rdf:type         owl:Class             _IRI