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[xsl] less than zero

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I want to check if a value ( $leftmargin ) is less than 0 -
check my example please.

"$wert" is ok, "$leftmargin" is ok too but the xsl:if does not work.:

<xsl:variable name="notesleftmargin"><xsl:value-of
select="ancestor::dxl:richtext//dxl:pardef[@id=$pabid]/@leftmargin"/></xsl:v
ariable>
<xsl:variable name="wert" select="substring-before($notesleftmargin,'in')"/>
<xsl:variable name="leftmargin" select="$wert - 1"></xsl:variable>

<xsl:if test="number($leftmargin) &lt; 0"><xsl:variable name="leftmargin"
select="0"></xsl:variable></xsl:if>
<xsl:attribute name="margin-left"><xsl:value-of
select="concat($leftmargin,'in')"/></xsl:attribute>

but this does not work.
why?

sascha



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