How do I pass a variable into an x select?

[Digby]

I've just noticed that the select attribute of all the x tags isn't 
ynamic, so I can't pass in a variable - which is kind of exactly what I 
need to do. Is there a workaround, or am I going to have to abandon jstl 
xml for xsl or something?

What I'm trying to do is below (v variable fails, but I can't hardcode 
the "two" for obvious reasons.

TIA
Digby
<x:parse var="xml">
    <channels id="channels">
        <channel id="tv">
            <channel id="one"/>
            <channel id="two"/>
            <channel id="three"/>
            <channel id="four"/>
        </channel>
        <channel id="sky">
            <channel id="movies"/>
            <channel id="sports"/>
        </channel>
    </channels>
</x:parse>
<c:set var="v" value="three"/>
Self: <x:out select="$xml//[EMAIL PROTECTED]'two']/@id"/>
Index: <x:out select="$xml/channels/@id"/>
Parent: <x:out select="$xml//[EMAIL PROTECTED]'${v}']/../@id"/> <!--FAILS!-->
First: <x:out 
select="$xml//[EMAIL PROTECTED]'two']/../channel[position()=1]/@id"/>
Last: <x:out 
select="$xml//[EMAIL PROTECTED]'two']/../channel[position()=last()]/@id"/>
Next: <x:out 
select="$xml//[EMAIL PROTECTED]'two']/following-sibling::channel/@id"/>
Prev: <x:out 
select="$xml//[EMAIL PROTECTED]'two']/preceding-sibling::channel/@id"/>

---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]