XML Filtering on Unique ID with XSL

I have a XML document that looks like the following

<xmlrootnode>
<person>
<childeren>
<child>
<id>1</id>
</child>
</childeren>
</person>
<person>
<childeren>
<child>
<id>2</id>
</child>
</childeren>
</person>
<person>
<childeren>
<child>
<id>2</id>
</child>
</childeren>
</person>
</xmlrootnode>

I need to convert this to the following:
<person>
<childeren>
<child id="1"/>
<child id="2"/>
</childeren>
</person>

As you can see I want to filter on ID and discard any doubles.
Has anybody have an idea to solve this. I don't want to use JavaScript within the XSL.

Greetings,


Jeroen

The filter part is easy, just use a xsl parameter and use that in your xsl template.

I have done something similar before but dont have the code with me at the moment. I do remember though that I used xml key functions to remove the duplicates.

Just a quick question... Do you use any tools to produce your xslt or are you hardcore and type it out manually?