Flattening a XML tree

Hi,

I have an input tree that looks like this

<?xml version="1.0"?>
<Tree>
 <TreeNode id="1" weight="5">
  <TreeNode id="2" weight="3">
   <TreeNode id="6" weight="2"/>
   <TreeNode id="7" weight="2"/>
   <TreeNode id="8" weight="2"/>
  </TreeNode>
  <TreeNode id="3" weight="4">
   <TreeNode id="9" weight="3">
    <TreeNode id="11" weight="2"/>
    <TreeNode id="12" weight="2"/>
   </TreeNode>
   <TreeNode id="10" weight="2"/>
  </TreeNode>
  <TreeNode id="4" weight="2"/>
  <TreeNode id="5" weight="2"/>
 </TreeNode>
</Tree>

I need to flatten the tree to a structure that looks like this. I've
looked at the archives, but haven't found an answer.

<?xml version="1.0"?>
<Tree>
  <TreeNode id="1" weight="5">
    <TreeNode id="2" weight="3"/>
    <TreeNode id="3" weight="4"/>
    <TreeNode id="4" weight="2"/>
    <TreeNode id="5" weight="2"/>
    <TreeNode id="6" weight="2"/>
    <TreeNode id="7" weight="2"/>
    <TreeNode id="8" weight="2"/>
    <TreeNode id="11" weight="2"/>
    <TreeNode id="12" weight="2"/>
    <TreeNode id="9" weight="3"/>
    <TreeNode id="10" weight="2"/>
  </TreeNode>
</Tree>

Any help is appreciated.

Thanks,

-Farooq.

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