query: #title: Long postal identifiers
  # Complex constraint from [[Property talk:P281]]
  # postal identifiers having more than 50 chars
  SELECT ?item ?stringvalueNowiki WHERE {
     ?item wdt:P281 ?stringvalue .
     FILTER(strlen(?stringvalue) > 50) .
     BIND(CONCAT('') AS ?stringvalueNowiki)
  }