Sorting - one to many

I am trying to figure out how to do a one to many sort relationship with
xsl.  (note - my list will have potentially millions of records with
hundreds of repeating fields)

For example,  if I have something like this:

<book>
    <title>
          A book that is published in 2 countries
     </title>
    <country>
          United States
    </country>
     <country>
          Canada
     </country>
</book>
<book>
    <title>
          A book that is published in 3 countries
     </title>
    <country>
          United States
    </country>
     <country>
          Canada
     </country>
    <country>
          Mexico
     </country>
</book>

I would like a sort that would sort by country and then title with results
like this:

Canada
     A book that is published in 2 countries
     A book that is published in 3 countries

Mexico
     A book that is published in 3 countries

United States
     A book that is published in 2 countries
     A book that is published in 3 countries


Any help would be appreciated.

Thanks,
Corey





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