Re: Variable in XPath...

> The $node_id contains the exact node name.

I suspect you have the wrong model of what's happening.

It's a bit hard to tell as you didn't show th eformat of either of your
input files, but I guess

config_doc.xml
looks like
<config>
<nodename>xxx</nodename>
</config>

if so then $node_id contains a single element node (nodename)

so 

<xsl:for-each select="$node_id">

will select that node (in config_doc.xml, not any nodes in the original
document)

I think perhaps you want to select a node in the original document with
name given by the config file, but that's

<xsl:for-each select="//*[name()=$node_id]">

David

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