Some products offer an xx:evaluate() extension function that allows you
to evaluate an XPath expression supplied as a string.

The other technique is to create or modify the stylesheet source before
compiling it.

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

> -----Original Message-----
> From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx 
> [mailto:owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of 
> bernd@xxxxxxxxxxxxx
> Sent: 03 January 2003 16:41
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  string parameter to node-set?
> 
> 
> I am at a loss, and wonder if anybody can help: I pass two parameter 
> from Javascript into XSLT, the URI of an XML document and an XPath 
> expression. Both parameters are strings as far as JavaScript 
> is concerned.
> 
> I can load the XML data with document($para-xml) just fine:
> 
>     <xsl:param name="para-xml"/>
>     <xsl:param name="para-xpath" select="'/'"/>
> 
>     <xsl:template match="/">
>         <xsl:apply-templates select="document($para-xml)" 
> mode="transform"/>
>     </xsl:template>
> 
> Next, I would like to use the XPath expression to select the 
> node(s) the 
> subsequent transformation should apply to. Something along 
> the lines of 
> this:
> 
>     <xsl:template match="/" mode="transform">
>         <xsl:apply-templates select="/root/data[@id='whatever']"/>
>     </xsl:template>
> 
> That works great, too. However, I find myself unable to using 
> the XPath 
> parameter instead of the constant XPath expression, as in
> 
>     <xsl:template match="/" mode="transform">
>         <xsl:apply-templates select="$para-xpath"/>
>     </xsl:template>
> 
> I suppose this is because the parameter is of type string, and the 
> select attribute requires a node set. How do I solve this?
> 
> The key problem is that I need to transform a subset of a larger XML 
> stream, where the subset is defined through an XPath 
> expression and all 
> this must happen within XSL in order to avoid cross-domain security 
> constrains in JavaScript. Any recommendations welcome.
> 
> TIA
> Bernd
> 
> 
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> 


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