document() and keys

Hi XSLT experts,

A while ago I asked about how to refer to nodes in the original input
while processing another document().  A few of you replied with the
excellent suggestion of storing the root of the original document in a 
global variable:

<xsl:variable name="src-root" select="/"/>

and then selecting nodes inside it like this:

....select="$src-root//[ some test ]"

This works great.

But: as some of you might have guessed from the // up there, I now
find that I can make the transformation go about 20 times faster if I
use keys instead.  But I can't see how to make keys work in this
multi-document situation.

Having searched the archives I established that something like this
could work:

<xsl:for-each select="$src-root">
  .... select="key(keyname,...)" ...
</xsl:for-each>

I think that this does get the correct nodes (though I'm not 100% sure
of it).

The problem is that I want to pass the selected node as a parameter to 
a named template.  I have tried this:

<xsl:call-template.....>
  <xsl:for-each select="$src-root">
    <xsl:with-param .... select="key(keyname,...)"/>
  </xsl:for-each>
</xsl:call-template>

But that's not legal XSL.  So I tried putting it in a variable:

<xsl:variable name="tmp">
  <xsl:for-each select="$src-root">
    <xsl:value-of select="key(keyname,...)"/>
  </xsl:for-each>
</xsl:variable>

<xsl:call-template.....>
  <xsl:with-param select="$tmp"/>
</xsl:call-template>

But that gives the "result fragment not node set" error, so I tried
using a conversion extension function (yuk):

<xsl:call-template.....>
  <xsl:with-param select="xalan:nodeset($tmp)"/>
</xsl:call-template>

But that isn't working either: I think that the nodeset is copying the 
nodes, so my code in the called template that tries to look up its
parents fails to work.

Now I've run out of ideas.  Help!


--Phil.



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