remove duplicates in each big entry

I don't find any example for my doubt about xsl, so i post my question.
Supose that i have the next xml:

<root>
<item>
<value>foo</value>
<value>foo</value>
<value>bar</value>
</item>
<item>
<value>foo</value>
<value>cat</value>
<value>cat</value>
</item>
</root>

and i would like to create a xml like this:

<root>
<item>
<value>foo</value>
<value>bar</value>
</item>
<item>
<value>foo</value>
<value>cat</value>
</item>
</root>

As you can see, i want to remove all duplicates in each entry <item>, not in 
all document.
The examples that i find, is about all document, not about my question.
What lines i put in my xsl?


Thanks,
psc

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