[xsl] Finding max values

["tom tom" <tomxsllist@xxxxxxxxxxx>]

Using a single XPath expression in XSLT 2 can anyone recommend the most 
appropriate way to find a maximum value (ie most recent) of a date datatype 
that is encoded in the following kind of construct:

<objects>
<object>
	<p>
		<date publish="2005-10-05T02:08:54-03:00"/>
	</p>
</object>
<object>
	<p>
		<date publish="2005-10-03T02:08:54-03:00"/>
	</p>
</object>
<object>
	<p>
		<date publish="2005-10-04T02:08:54-03:00"/>
	</p>
</object>
<object>
	<p>
		<date publish="2005-10-04T02:08:54-03:00"/>
	</p>
</object>
</objects>

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