Function for easily appending namespaces to all key:value pairs of an object. Full traversal, so objects in arrays too.

Namespaces.dwl

%dw 2.0

fun appendNamespace(data, nsSelector: (k: Key) -> Namespace | Null) =
  data match {
    case is Array -> data map appendNamespace($, nsSelector)
    case is Object -> data mapObject do {
      var ns0 = nsSelector($$)
      ---
      if (ns0 != null) ns0#"$($$)": appendNamespace($, nsSelector)
      else ($$): appendNamespace($, nsSelector)
    }
    else -> data
}