xsl:key match expression doesn't support variables - any way round?

I'm using asp to take user input from a form and set variables in an xsl doc. I want to be able to use a variable with xsl:key, eg:

<xsl:key name="searchKey1" match="project" use="$searchBy1" />

But because it's a match, not a select, expression, I can't. I could get round this manually - and set up a key for each search category. But the whole point with what I'm building is that the search categories are derived from an xml document which can be added to/changed etc. over time. ie: To add a new category you don't have to go back into the xsl code.

Is there a way round this? I've scratched my head a lot and really can't work out what to do, so any help would be much apprieciated. Here's the relevant files:


a) sample from the xml doc:

<data>
<project>
<name>Community Enablers - Fulham Court</name>
<no>0304_1_1</no>
<finYear>0304</finYear>
<year>03</year>
<month>05</month>
<borough>Hammersmith and Fulham</borough>
<subArea>Fulham</subArea>
<theme>Communities</theme>
</project>
<project>
<name>Monks Park</name>
<no>0304_2_1</no>
<finYear>0304</finYear>
<year>03</year>
<month>08</month>
<borough>Brent</borough>
<subArea>Toykington</subArea>
<theme>Land</theme>
</project>
...
</data>


b) the xsl doc:

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:variable name="searchBy1">any</xsl:variable>
<xsl:variable name="searchFor1">any</xsl:variable>
<xsl:variable name="searchBy2">any</xsl:variable>
<xsl:variable name="searchFor2">any</xsl:variable>

<xsl:key name="searchKey1" match="project" use="$searchBy1" />
<xsl:key name="searchKey2" match="project" use="$searchBy2" />
<xsl:template match="/data">
<h2>Information is available on the following projects</h2>
<p>Not what you're looking for? <a href="javascript:history.back()">Try another search</a></p><hr/><br/>

<xsl:for-each select="key('searchKey1', $searchFor1)">
<xsl:sort select="no"/>
<p id="{no}"><a href="{concat('http://westlondonhome.ground-level.org/', no, '.xml')}"><xsl:value-of select="name"/></a><hr/><br/></p>
</xsl:for-each>

<xsl:for-each select="key('searchKey2', $searchFor2)">
<xsl:sort select="no"/>
<p id="{no}"><a href="{concat('http://westlondonhome.ground-level.org/', no, '.xml')}"> <xsl:value-of select="name"/></a><hr/><br/></p>
</xsl:for-each>

</xsl:template>
</xsl:stylesheet>


c) For what it's worth here's the asp file: (setting variables may look clumsy - I'm new to this and couldn't for the life of me get the addParameter method to work)

<%
var xsl = Server.CreateObject("Microsoft.XMLDOM")
xsl.async = false
xsl.load(Server.MapPath("stylesheet.xsl"))

var xml = Server.CreateObject("Microsoft.XMLDOM")
xml.async = false
xml.load(Server.MapPath("projectSearchData.xml"))

sBy1 = Request.Form("searchBy1")
sFor1 = Request.Form("searchFor1")
sBy2 = Request.Form("searchBy2")
sFor2 = Request.Form("searchFor2")

root=xsl.documentElement

a=root.firstChild.firstChild
var newTxt1 = xsl.createTextNode(sBy1)
a.removeChild(a.firstChild)
a.appendChild(newTxt1)

b=root.firstChild.secondChild
var newTxt2 = xsl.createTextNode(sFor1)
b.removeChild(b.firstChild)
b.appendChild(newTxt2)

c=root.firstChild.thirdChild
var newTxt3 = xsl.createTextNode(sBy2)
c.removeChild(c.firstChild)
c.appendChild(newTxt3)

d=root.firstChild.fourthChild
var newTxt4 = xsl.createTextNode(sFor2)
d.removeChild(d.firstChild)
d.appendChild(newTxt4)

Response.Write(xml.transformNode(xsl))
%>

Thanks in advance,

james.

cheers - just picked this up - yours is the route I've gone down...

j