XSL and processing

Hello,

I have a question regarding processing in XSL. I have the following document,

<root>
   <pool>
       <doc identifier="node6">
           <title>The node title</title>
       </doc>
       <doc identifier="node14">
           <title>The node title</title>
       </doc>
   </pool>
   <relations>
       <rel>
            <ref nodeidentifier="node6"/>
       <rel>
       <rel>
            <ref nodeidentifier="node14"/>
       <rel>
   </relations>
</root>

I would like to process the relations - rel section as a tree (image) and
after the tree node display the title of the references doc node. I have
tried the following,

<xsl:template match="root">
    <xsl:for-each select="relations/rel/ref">
	<IMG src="plus.bmp" style="cursor: hand;" align="top"></IMG>
	<SPAN>
	<xsl:process
select="ancestor(root)/pool/doc[attribute(identifier)='{attribute(nodeidenti
fier)}']/title"/>
	</SPAN>
    </xsl:for-each>
</xsl:template>

<xsl:template match="root/doc/title">
        <xsl:process-children/>
</xsl:template>

 I am only interested in the doc[identifier]/title matching the ref -
nodeidentifier value. 

It seems like I am loosing the value of {attribute(nodeidentifier)} when I
go into a new xsl:process instruction. 

Does anyone know how to process and match attribute values the way I want
to do ? Is it possible with XSL ?

Regards

Tomas


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