rearranging nodes using XSLT

Hi

How can I rearrange nodes in xslt?

My source XML looks something like this: I am trying to rearrance
tbd1, tbd2, tbd3 in that order

<root>
<list1>
<item1>
<para>sample</para>
</item1>
<tbd2><para>test1</tbd2>
<tbd1><para>test1</tbd1>
<list2>
<item1>
<para>sample</para>
</item1>
<tbd3><para>test1</tbd3>
<tbd1><para>test1</tbd1>
<item1>
<para>sample</para>
</item1>
</list2>
</list1>
</root>

My desired output:

<root>
<list1>
<item1>
<para>sample</para>
</item1>
<tbd1><para>test1</tbd1>
<tbd2><para>test1</tbd2>
<list2>
<item1>
<para>sample</para>
</item1>

<tbd1><para>test1</tbd1>
<tbd3><para>test1</tbd3>
<item1>
<para>sample</para>
</item1>
</list2>
</list1>
</root>

Thanks in advance for your help.