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xsl:key on variable containing result of apply-templat

Subject: xsl:key on variable containing result of apply-templates
From: Grainne Reilly <greilly1@xxxxxxxxx>
Date: Sat, 23 Nov 2002 22:20:16 -0500
xsl key variable
Hello,
This is my first post to this list and I apologize for it's length. My question basically is whether it is possible to create a key on a variable which contains the result of applying a template? In my real stylesheet and xml the template which creates the node-set I would like to create the key on is much more complicated than the example I have given below - but the concept is the same. I apply-templates to the source document and the result tree fragment is kept in a variable ($alphabet). I convert this to a node-set ($alphabet-exslNodeSet) and then use that node-set in another template. It works but is pretty slow - I think it would be much faster if I were able to create a key on the node-set (each item in the node set is used multiple times). I can't see how to do that - it looks like my attempt below gives me the code in the variable, not the result. I know I can't use a variable in the key's match attribute, so I'm at a loss how to do this.
Thanks for any suggestions,
Grainne.


The Stylesheet:
============
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:saxon="http://icl.com/saxon" xmlns:exsl="http://exslt.org/common"
exclude-result-prefixes="ss"
extension-element-prefixes="exsl saxon">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>


	<xsl:variable name="alphabet">
		<xsl:apply-templates select="/test/alphabetList/alphabet" mode="loadList"/>
	</xsl:variable>

<xsl:variable name="alphabet-NodeSet" select="document('')/xsl:stylesheet/xsl:variable[@name='alphabet']" />
<xsl:variable name="alphabet-exslNodeSet" select="exsl:node-set($alphabet)"/>

<xsl:key name="myKey" match="/*/xsl:variable[@name='alphabet']" use="@col"/>


	<xsl:template match="alphabet" mode="loadList">
		<xsl:copy-of select="."/>
	</xsl:template>

<xsl:template match="*"/>

<xsl:template match="/">
Value of alphabet variable is:<xsl:text>
</xsl:text> <xsl:copy-of select="$alphabet"/><xsl:text>
</xsl:text>
Value of alphabet-NodeSet varaible is (I think this is what I get in the key!!)<xsl:text>
</xsl:text><xsl:copy-of select="$alphabet-NodeSet"/><xsl:text>
</xsl:text>
Value of alphabet-exslNodeSet variable is <xsl:text>
</xsl:text><xsl:copy-of select="$alphabet-exslNodeSet"/> <xsl:text>
</xsl:text>
<xsl:apply-templates select="test/numbers"/>
</xsl:template>


<xsl:template match="numbers">
<xsl:for-each select="number">
<xsl:variable name="curPosition" select="position()"/>
Using the key to get the alphabet element (THIS is what I'd like to do since each node in the set is used multiple times):
<number value="{.}">
<xsl:for-each select="document('')">
<xsl:copy-of select="key('myKey',$curPosition)"/>
</xsl:for-each>
</number>
Using the exslNodeSet variable to get the alphabet element (what I am doing but which is very slow in my real code):
<number value="{.}">
<xsl:copy-of select="$alphabet-exslNodeSet/alphabet[@col=$curPosition]"/>
</number>
<xsl:text>
</xsl:text>
</xsl:for-each>
</xsl:template>

</xsl:stylesheet>




Example xml:
==========
<?xml version="1.0" encoding="UTF-8"?>
<test>
	<alphabetList>
		<alphabet col="1">a</alphabet>
		<alphabet col="2">b</alphabet>
		<alphabet col="3">c</alphabet>
		<alphabet col="4">d</alphabet>
		<alphabet col="5">e</alphabet>
	</alphabetList>
	<numbers>
		<number>one</number>
		<number>two</number>
		<number>three</number>
		<number>four</number>
		<number>five</number>
	</numbers>
</test>

Result (tidied up a little):
====================
<?xml version="1.0" encoding="UTF-8"?>
Value of alphabet variable is:
<alphabet col="1">a</alphabet>
<alphabet col="2">b</alphabet>
<alphabet col="3">c</alphabet>
<alphabet col="4">d</alphabet>
<alphabet col="5">e</alphabet>

Value of alphabet-NodeSet varaible is (I think this is what I get in the key!!)
<xsl:variable xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:saxon="http://icl.com/saxon" xmlns:exsl="http://exslt.org/common" name="alphabet">
<xsl:apply-templates select="/test/alphabetList/alphabet" mode="loadList"/>
</xsl:variable>

Value of alphabet-exslNodeSet variable is
<alphabet col="1">a</alphabet>
<alphabet col="2">b</alphabet>
<alphabet col="3">c</alphabet>
<alphabet col="4">d</alphabet>
<alphabet col="5">e</alphabet>

Using the key to get the alphabet element (THIS is what I'd like to do since each node in the set is used multiple times):
<number value="one"/>
Using the exslNodeSet variable to get the alphabet element (what I am doing but which is very slow in my real code):
<number value="one">
<alphabet col="1">a</alphabet>
</number>

...<snip>...
Using the key to get the alphabet element (THIS is what I'd like to do since each node in the set is used multiple times):
<number value="five"/>
Using the exslNodeSet variable to get the alphabet element (what I am doing but which is very slow in my real code):
<number value="five">
<alphabet col="5">e</alphabet>
</number>




XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list


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