for-each UNIQUE

[Wickersty]

Is there a way to do a for-each or something similar and look for UNIQUE values?

IE - say my XML was:

<xml>
<item id=&quot;1&quot;/>
<item id=&quot;1&quot;/>
<item id=&quot;2&quot;/>
<item id=&quot;3&quot;/>
<item id=&quot;3&quot;/>
</xml>

Could I do a query that returns some sort of list or queue of unique ids?

Thanks