distinct-values

Hi,

I've the following XML-file (part of it):

<ReferenceList>
  <SourceList>
    <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel/10687759/"/>
    <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel/10689339/"/>
    <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel/10689856/"/>
  </SourceList>
  <TargetList>
    <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel-v/10689066/"/>
    <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel-v/12404611/"/>
    <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel-v/10691596/"/>
    <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel/10689856/"/>
    <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel/10692131/"/>
    <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel-v/10690342/"/>
  </TargetList>
</ReferenceList>

I'd like to create the following out of this:

<absatz>
  <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel/10687759/"/>
  <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel/10689339/"/>
  <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel/10689856/"/>
  <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel-v/10689066/"/>
  <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel-v/12404611/"/>
  <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel-v/10691596/"/>
  <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel/10692131/"/>
  <Link ref="wdg://pschyrembel/sozmed/sozmed_artikel-v/10690342/"/>
</absatz>

The Problem is, how to handle distinct values. The XML-file contains the
entry "<Link ref="wdg://pschyrembel/sozmed/sozmed_artikel/10689856/"/>"
following after the element <SourceList> and following after the element
<TargetList>.

How is it possible, to create a list of distinct values? I tried to use
distinct-values() but without any result.

Kind regards,
Monika