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

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Subject: Re: 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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G. Ken Holman                 mailto:gkholman@xxxxxxxxxxxxxxxxxxxx
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Current Thread
Using xsl:key and key() function on xsl:variable lookup data Russ Loucks - 20 Aug 2008 16:36:35 -0000 G. Ken Holman - 20 Aug 2008 16:52:35 -0000 <= Russell Loucks - 20 Aug 2008 17:06:58 -0000

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