<xsl:param name="Filter" select="@rebate>0"/>
so Filter is the boolean value true or false depending on the value of
the rebate attribute at this point.
<xsl:apply-templates
select="/Cat[(_at_)CatId=$Cat]/Prod[$Filter]"/>
If Filter is true it will have no effect but if Filter is the boolean
value false then this selct will not slect anything.
either way Filter is a constant value not depending on the path so this
is the same as
<xsl:if test="$Filter">
<xsl:apply-templates
select="/Cat[(_at_)CatId=$Cat]/Prod"/>
</xsl:if>
David
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