[xsl] Outputing the same value-of for different nodes

["Liron" <magilam@xxxxxxxxxxxxxxxx>]

Hello,

I wanted to ask how to output the same value on different nodes without 
effecting performance. Here's an example:

original xml file:

<tree>
  <son><value>something1</value></son>
  <son><value>something2</value></son>
  <son><value>something3</value></son>
</tree>

Lets assume I want to output something like this:

<tree>
  <first>
      <son><value>something1><position>1</position></value></son>
      <son><value>something2><position>2</position></value></son>
      <son><value>something3><position>3</position></value></son>
  </first>
  <second>
      <son><value>something1><position>1</position></value></son>
      <son><value>something2><position>2</position></value></son>
      <son><value>something3><position>3</position></value></son>
  </second>
</tree>

This is just an example so please don't question the need for such an output 
;)

In my xslt I'd probably use a xsl:for-each select="/tree/son" and then 
output the "value" node and "position()" under the "first" node but would I 
have to write a
"xsl:for-each" again only output it for the "second" node or there's some 
way of outputing the same value, lets say "position()", under different 
output nodes?

Thank you
Liron