RE: [xsl] Parameters in XPath

["Michael Kay" <michael.h.kay@xxxxxxxxxxxx>]

> What I'm trying to accomplish with the Filter
> parameter is to dynamically pass into the stylesheet a
> XPath expression to be evaluated.
> For example:
> 
> <xsl:param name="Filter" select="@rebate>9.99 and 
> @shippingMethod='Ground' and @cost<199.99"/>
> 
> <xsl:apply-templates
> select="/Cat[@CatId=$Cat]/Prod[$Filter]"/>
> 

And I think several people explained (a) that you can't do this, except
with the xx:evaluate() extension that several processors provide, and
(b) that if you do use these extensions, the select attribute must be a
string containing the expression, not the expression itself: so you need
to write:

<xsl:variable name="defaultFilter">@rebate &gt; 9.99 and 
@shippingMethod='Ground' and @cost &lt; 199.99</xsl:variable>

<xsl:param name="Filter" select="string($defaultFilter)"/>

If you write it your way, $Filter will be the value of the expression,
not the expression itself.

Michael Kay
Software AG
home: Michael.H.Kay@xxxxxxxxxxxx
work: Michael.Kay@xxxxxxxxxxxxxx 


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