add-namespace.xqy

declare namespace dmc = "dmc";

declare function local:change($node)
{
  typeswitch($node)
  case element(change-me) return
    element { xs:QName("dmc:" || fn:local-name($node)) } {
      $node/@*,
      $node/node() ! local:change(.)
    }
  case element() return 
    element { fn:node-name($node) } {
      $node/@*,
      $node/node() ! local:change(.)
    }
  default return $node
};