[xsl] Testing strings for null

[Paul Holman <pablos@xxxxxxxx>]

OK, I'm a newbie.  Please beat me over the head with why this doesn't work:

<xsl:choose>
       <xsl:when test="ASTRING $igt$ 0">
               <xsl:value-of select="ASTRING"/>
       </xsl:when>
       <xsl:otherwise>
               Empty!
       </xsl:otherwise>
</xsl:choose>

I just want to know if ASTRING is null, and I can't seem to figure out what 
to do.  This test comes up False every time.

Thanks, pablos.

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