Rendering XML

Hi:

I have the following XML file:

<npc id="1">
  <p desc="desktop" mpn="123" price="29.99"
vendor="xxx.com"/>
  <p desc="chair"   mpn="654" price="12.99"
vendor="xxx.com"/>
  <p desc="desktop" mpn="123" price="27.99"
vendor="yyy.com"/>
  <p desc="desktop" mpn="123" price="30.99"
vendor="zzz.com"/>
  <p desc="table"   mpn="389" price="45.99"
vendor="xxx.com"/>
</npc>

and I'd like to generate the following output but I
haven't figure it out yet.
Any ideas??
Thanks.

<npc id="1">
  <p desc="desktop" mpn="123">
    <pdet price="29.99" vendor="xxx.com"/>
    <pdet price="27.99" vendor="yyy.com"/>
    <pdet price="30.99" vendor="zzz.com"/>
  </p>
  <p desc="chair"   mpn="654" price="12.99"
vendor="xxx.com"/>
  <p desc="table"   mpn="389" price="45.99"
vendor="xxx.com"/>
</npc>


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