Mapping Elements into New Namespaces

Greatly simplified, I have source XML that looks like this

File: Source.xml
================
<?xml version="1.0"?>
<Root xmlns="http://www.aaa.com";>
 <PartAB>
  <A>1</A>
  <B>2</B>
 </PartAB>
 <PartCD>
  <C>3</C>
  <D>4</D>
 </PartCD>   
</Root>

And I need to transform it into this output format:

File: Target.xml
================
<?xml version="1.0"?>
<Output>
 <Parts  xmlns="http://www.bbb.com";>
  <Part1>
   <A>1</A>
   <B>2</B>
  </Part1>
  <Part2>
   <v:Details xmlns="http://www.ccc.com"; xmlns:v="http://www.bbb.com";>
    <C>3</C>
    <D>4</D>   
   </v:Details>
  </Part2>
 </Parts>
</Output>

I am having trouble transforming <C> and <D> because of the changed
default namespace on <Details>. Can someone suggest how to accomplish
this? I do not have control over the structure of the elements and 
namespaces in Target.xml. Copy to dandiebolt(_at_)yahoo(_dot_)com would help as 
I am on digest. Thanks in advance. 



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