Insert refs

Hello,

	I have a XML file with a lot of repeated information. The
question is how do I insert refs not repeating information:

For example if I have:

<email>
      <to>John</to>
      <to>Bill</to>
</email>
<email>
      <to>John</to>
</email>

I wnat the output to be:

      <to id ="id1">John</to>
      <to id = "id2">Bill</to>

      <email>
      	<to ref = "id1"/>
      	<to ref = "id2"/>
      </email>
      <email>
      	<to ref = "id1"/>
      </email>

Thanks in advance,

Ricardo Saraiva.




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