XML grouping by attribute using Muenchian method?

Hi

This is my XML

<bookshelf>
  <book type="myshelf" title="some book" /> 
  <book type="yourshelf" title="some other book" /> 
  <book type="myshelf" title="yet some other book" /> 
</bookshelf>

I want to group these books by attribute "type" e.g. looking like this

myshelf
        some book
        yet some other book
yourshelf
        some other book

I've been messing around with keys but I can't get the desired result...

Thanks
Nicolas


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