query: #title: en label should match P1705 value
  # Complex constraint from [[Property talk:P6597]]
  # check [[Property:P1705|native label&#32;<small dir="ltr">(P1705)</small>]] and label in English (en)
  SELECT ?item ?nl
  {
    ?item wdt:P6597 ?value .
    ?item wdt:P1705 ?nl . 
    BIND( strlang(str(?nl),"en") as ?en_label) 
    FILTER NOT EXISTS { ?item rdfs:label ?en_label }
  }