Re: [xsl] Using xsl:key and key() function on xsl:variable lookup data

Subject: Re: [xsl] Using xsl:key and key() function on xsl:variable lookup data
From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>
Date: Wed, 20 Aug 2008 12:52:00 -0400
At 2008-08-20 11:36 -0500, Russ Loucks wrote:
I have what I think should be a very easy problem to solve but the
solution eludes me.

The solution is in XSLT 2.0.


I have a simple stylesheet that attempts to lookup a value using the
xsl:key tag and key() functions.

I can easily get this to work if the lookup table is in a file and
read it in using the 'document()' function, as follows:

<xsl:stylesheet version="1.0"

You are using XSLT 1.0.


Below I've modified your stylesheet using XSLT 2.0, then I rewrote the template rule taking advantage of the new argument introduced in key().

I hope this helps.

. . . . . . . . . . Ken


T:\ftemp>type russ.xml <dataList> <data>key2</data> <data>key1</data> </dataList>

T:\ftemp>type russ.xsl
<xsl:stylesheet version="2.0"
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
        xmlns:exsl="http://exslt.org/common";
        extension-element-prefixes="exsl"
        >
        <xsl:variable name="lookupRTF">
                <entries>
                        <entry key="key1">lookup entry 1</entry>
                        <entry key="key2">lookup entry 2</entry>
                        <entry key="key3">lookup entry 3</entry>
                </entries>
        </xsl:variable>

<xsl:key name="lookupKey" match="entry" use="@key"/>

<xsl:template match="dataList/data">

                <xsl:variable name="dataKey" select="."/>
                data key: <xsl:value-of select="$dataKey" />

<xsl:for-each select="$lookupRTF" >
lookup entry value: <xsl:value-of select="key('lookupKey', $dataKey)"/>
</xsl:for-each>
</xsl:template>


</xsl:stylesheet>

T:\ftemp>call xslt2 russ.xml russ.xsl russ.out

T:\ftemp>type russ.out
<?xml version="1.0" encoding="UTF-8"?>

                data key: key2
                        lookup entry value: lookup entry 2

                data key: key1
                        lookup entry value: lookup entry 1

T:\ftemp>type russ2.xsl
<xsl:stylesheet version="2.0"
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
        xmlns:exsl="http://exslt.org/common";
        extension-element-prefixes="exsl"
        >
        <xsl:variable name="lookupRTF">
                <entries>
                        <entry key="key1">lookup entry 1</entry>
                        <entry key="key2">lookup entry 2</entry>
                        <entry key="key3">lookup entry 3</entry>
                </entries>
        </xsl:variable>

<xsl:key name="lookupKey" match="entry" use="@key"/>

<xsl:template match="dataList/data">
data key: <xsl:value-of select="." />
lookup entry value: <xsl:value-of select="key('lookupKey', ., $lookupRTF)"/>
</xsl:template>


</xsl:stylesheet>

T:\ftemp>call xslt2 russ.xml russ2.xsl russ2.out

T:\ftemp>type russ2.out
<?xml version="1.0" encoding="UTF-8"?>

          data key: key2
          lookup entry value: lookup entry 2

          data key: key1
          lookup entry value: lookup entry 1

T:\ftemp>rem Done!



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