query: #title: Check location (without the prefix EXT)
  # Complex constraint from [[Property talk:P2584]]
  #
  SELECT ?item ?value {
  	?item wdt:P2584 ?value.
    FILTER NOT EXISTS {
      ?item wdt:P131/wdt:P131? ?loc.
      ?loc wdt:P300 ?iso.
    }
    FILTER (SUBSTR(?value, 1, 3) NOT IN ("EXT"))
  }