assertion  retraction  graph  subject              predicate        object               datatype  annotation
1          0           graph  obo:FOODON_00002220  rdfs:label       salmon food product  @en       
1          0           graph  obo:FOODON_00002220  rdfs:subClassOf  obo:FOODON_00001248  _IRI      
1          0           graph  obo:FOODON_00002220  rdf:type         owl:Class            _IRI