Xquery to remove namespace from XML

xquery version "1.0" encoding "utf-8";

(:: OracleAnnotationVersion "1.0" ::)

declare variable $input as element() external;

declare function local:change-ns($input as element()) as element() {

    

    element {fn:local-name($input) }

    {

    for $child in $input/(@*,node())

      return

      if ($child instance of element())

        then local:change-ns($child)

      else $child

    }

};

local:change-ns($input)