Re: [xsl] multiple values for the key

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2008-08-02 11:18 +0530, Mukul Gandhi wrote:
> David, has given one possible solution, in XSLT 1.0 (which has
> advantage, that you don't need to use any extension function). Mike
> gave you a XSLT 2.0 version (which I feel, is cool).
>
> Based on Mike's idea, here is another version using node-set extension
> function in XSLT 1.0,

The node-set extension can be avoided to achieve what you want.

>     <xsl:for-each select="key('x', exslt:node-set($x-values)/v)">

The above can be replaced with standard XSLT 1.0 to read the 
stylesheet file as a source node tree ...

    <xsl:for-each
      select="key('x',document('')/*/xsl:variable[@name='x-values']/v)">

... to get what you want without using extensions.  I think it is 
important not to rely on extensions when not absolutely 
necessary.  The "ken.xsl" below shows this.

I grant, though, that if your stylesheet is large then putting this 
into a small included or imported fragment would keep any overhead of 
building the tree small.  If, Mukul, you were looking to create a 
maintainable resource that could be shared across different 
stylesheets, then "ken2.xsl" below would achieve that where the only 
tree being built is for the "ken2values.xsl" fragment with the 
data.  This produces a simple variable that XSLT 1.0 stylesheet 
writers could use.

But moving to XSLT 2.0 would certainly be preferred.

I hope this helps.

. . . . . . . . Ken


t:\ftemp>type iyer.xml
<?xml version="1.0" encoding="UTF-8"?>
<root>
    <subroot id="11111">
        <ccc>11</ccc> ==> needs to be picked
        <ddd>2005-08-26</ddd>
        <eee>aaaaa</eee>
    </subroot>
    <subroot id="11111">
        <ccc>22</ccc> ==> needs to be picked
        <ddd>2005-08-26</ddd>
        <eee>bbbbb</eee>
    </subroot>
    <subroot id="11111">
        <ccc>11</ccc>
        <ddd>2005-08-26</ddd>
        <eee>ccccc</eee>
    </subroot>
    <subroot id="11111">
        <ccc>11</ccc>
        <ddd>2005-08-26</ddd>
        <eee>ddddd</eee>
    </subroot>
    <subroot id="11111">
        <ccc>33</ccc>
        <ddd>2005-08-26</ddd>
        <eee>eeeee</eee>
    </subroot>
</root>

t:\ftemp>type mukul.xsl
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                       xmlns:exslt="http://exslt.org/common";
                       exclude-result-prefixes="exslt"
                       version="1.0">

<xsl:output method="xml" indent="yes" />

<xsl:key name="x" match="subroot" use="ccc"/>

<xsl:variable name="x-values">
  <v>11</v>
  <v>22</v>
</xsl:variable>

<xsl:template match="/root">
  <result>
    <xsl:for-each select="key('x', exslt:node-set($x-values)/v)">
      <value>
        <xsl:value-of select="eee" />
      </value>
    </xsl:for-each>
  </result>
</xsl:template>

</xsl:stylesheet>

t:\ftemp>call xslt iyer.xml mukul.xsl mukul.xml

t:\ftemp>type mukul.xml
<?xml version="1.0" encoding="utf-8"?>
<result>
   <value>aaaaa</value>
   <value>bbbbb</value>
   <value>ccccc</value>
   <value>ddddd</value>
</result>
t:\ftemp>type ken.xsl
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="1.0">

<xsl:output method="xml" indent="yes" />

<xsl:key name="x" match="subroot" use="ccc"/>

<xsl:variable name="x-values">
  <v>11</v>
  <v>22</v>
</xsl:variable>

<xsl:template match="/root">
  <result>
    <xsl:for-each
      select="key('x',document('')/*/xsl:variable[@name='x-values']/v)">
      <value>
        <xsl:value-of select="eee" />
      </value>
    </xsl:for-each>
  </result>
</xsl:template>

</xsl:stylesheet>

t:\ftemp>call xslt iyer.xml ken.xsl ken.xml

t:\ftemp>type ken.xml
<?xml version="1.0" encoding="utf-8"?>
<result>
   <value>aaaaa</value>
   <value>bbbbb</value>
   <value>ccccc</value>
   <value>ddddd</value>
</result>
t:\ftemp>type ken2.xsl
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="1.0">

<xsl:output method="xml" indent="yes" />

<xsl:key name="x" match="subroot" use="ccc"/>

<xsl:include href="ken2values.xsl"/>

<xsl:template match="/root">
  <result>
    <xsl:for-each select="key('x',$x-values)">
      <value>
        <xsl:value-of select="eee" />
      </value>
    </xsl:for-each>
  </result>
</xsl:template>

</xsl:stylesheet>

t:\ftemp>type ken2values.xsl
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="1.0">

<xsl:variable name="x-values-data">
  <v>11</v>
  <v>22</v>
</xsl:variable>

<xsl:variable name="x-values"
              select="document('')/*/xsl:variable[@name='x-values-data']/v"/>

</xsl:stylesheet>

t:\ftemp>call xslt iyer.xml ken2.xsl ken2.xml

t:\ftemp>type ken2.xml
<?xml version="1.0" encoding="utf-8"?>
<result>
   <value>aaaaa</value>
   <value>bbbbb</value>
   <value>ccccc</value>
   <value>ddddd</value>
</result>
t:\ftemp>rem Done!



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