Finding the highest node value

Say I have an XML fragment going like this:

=====================

<population unit="million">
  <country>
    <name>China</name>
    <population>1273</population>
    <continent key="2"/>
  </country>
  <!-- some more <country> -->
  <country>
    <name>India</name>
    <population>1033</population>
    <continent key="2"/>
  </country>
</population>

=====================

What I would like to do is store in a <xsl:variable> the highest
<population> value?

How would one go around this?

Thanks,

Antoine


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