[xsl] Summing Time Durations Help

Subject: [xsl] Summing Time Durations Help
From: "Kent Seegmiller" <hookjaw20@xxxxxxxxxxx>
Date: Wed, 5 Oct 2005 00:54:06 -0600
I have some duration elements like
<alltimes>
   <tduration>PT1H23M</tduration>
   <tduration>PT5M</tduration>
   <tduration>PT44M12S</tduration>
   <tduration>PT57M23S</tduration>
   ...
</alltimes>

What is the most efficient way to sum the durations?  Is there an xpath =
expression for this?

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