Automated Modify of a existing XML file. how to?

[sugar2]

Hi, I have few xml files with this format: it contains supplier info and a list of products.... but the products are not numbered (such as #1, #2, #3, etc)

 <Item>
   <Quantity>12</Quantity>
   <Code>20001318</Code>
   <TotalPrice>27.12</TotalPrice>
 </Item>

How can (or if is there a good tool to do that) batch number each item of the xml file? the result xml i wish to have is some like:

<Items>
  <Item>
   <ItemNumber>1</ItemNumber>
   <Quantity>12</Quantity>
   <Code>20001318</Code>
   <TotalPrice>27.12</TotalPrice>
  </Item>
  <Item>
   <ItemNumber>2</ItemNumber>
   <Quantity>2</Quantity>
   <Code>77701318</Code>
   <TotalPrice>27.12</TotalPrice>
  </Item>
  <Item>
   <ItemNumber>3</ItemNumber>
   <Quantity>1</Quantity>
   <Code>11111318</Code>
   <TotalPrice>27.12</TotalPrice>
  </Item>
</Items>

Thanks in advance

[sugar2]

well... finally the problem was solved using xsl styling

thaks anyway