sorting parameter ?

Hello !
I would like to sort xml datas to display them in function of the user's
sort choice.
I send the sorting parameter (chosen by the user in a HTML form) to the xsl
stylesheet with the function addParameter from my xslt processor.
As I cannot do :

<xsl:sort select="$SortParam" case-order="lower-first"/>

I must evaluate the parameter as an XPath expression, which i have done
using the *evaluate* function of the *dyn* namespace :

<xsl:sort select="dyn:evaluate(.,$SortParam)" case-order="lower-first"/>

This is my xsl declaration :

<xsl:stylesheet version="1.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                xmlns:dyn="http://exslt.org/dynamic";
                xmlns:msxsl="urn:schemas-microsoft-com:xslt"
                extension-element-prefixes="dyn msxsl">

and the dyn function is defined as follow :

        <msxsl:script implements-prefix="dyn" language="jscript">
           function evaluate(context, expression)
              {
                 return context.nextNode().selectNodes(expression);
              }
        </msxsl:script>

It work fine but I'm just wondering if there's not another way of doing it
using standard xsl. I have seen things with <xsl:key> but i don't know if it
is appropiate here and actually i don't really understand what's this
element aims at...

Do you have suggestions ?
In advance thanks,

Matthieu.


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