Split XML and output to different files

Hi:

I want to split my xml file into multiples files. Any
idea of how to accomplish it?

This is an example of the input file:

"input.xml"
<root>
<npc id="1">
  <p pid="1"/>
  <p pid="2"/>
  <p pid="3"/>
</npc>
<npc id="2">
  <p pid="3"/>
  <p pid="4"/>
  <p pid="5"/>
</npc>
<npc id="3">
  <p pid="4"/>
  <p pid="5"/>
  <p pid="6"/>
</npc>
</root>

The outputs should be like:

"npc1.xml"
<npc id="1">
  <p pid="1"/>
  <p pid="2"/>
  <p pid="3"/>
</npc>

"npc2.xml"
 <npc id="2">
  <p pid="3"/>
  <p pid="4"/>
  <p pid="5"/>
</npc>

"npc3.xml"
<npc id="3">
  <p pid="4"/>
  <p pid="5"/>
  <p pid="6"/>
</npc>

Thanks

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