[xsl] XPath expression for checking that an xs:duration value is not negative?

Subject: [xsl] XPath expression for checking that an xs:duration value is not negative?
From: "Costello, Roger L." <costello@xxxxxxxxx>
Date: Sat, 23 Apr 2011 09:22:06 -0400
Hi Folks,

What XPath expression will tell me if the xs:duration value in this element is
not negative:

    <duration>_______</duration>

/Roger

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