query: #title: to www or not to www
  # Complex constraint from [[Property talk:P856]]
  # Vast majority of sites would handle www. prefix for users. Very rare <s>dinosaurs</s> exceptions are possible.
  SELECT ?item ?value
  {
    ?item wdt:P856 ?value
    FILTER(STRSTARTS(STR(?value), "https://www.") \u007C\u007C STRSTARTS(STR(?value), "http://www."))
  } LIMIT 10