[xsl] Use of xsl:key to perform node traversal according to an association between nodes

Subject: [xsl] Use of xsl:key to perform node traversal according to an association between nodes
From: "Dunk, Michael (Mike)" <mikedunk@xxxxxxxxxxxxx>
Date: Wed, 26 Sep 2007 09:14:33 -0500
Thank you to Michael Kay and Wendell Piez for their help with processing
context and paths.

George Cristian Bina your comments about namespaces were appreciated.

I am struggling to find any clues in the examples of xsl:key in the text
xslt books about to use xsl:key to retrieve the contents of an element.
Or as Wendell Piez described it "the use of a key to perform node
traversal according to an association between nodes". Here is an
simplified example of the type of xml input I need to read:

<?xml version="1.0" encoding="UTF-8"?>
<Teams_and_Players>
  <Teams>
    <Team name="Man Utd">

<TeamPlayer>{0EA17FA0-D21B-4F1E-8B11-A250A6CF266C}+00000000</TeamPlayer>

<TeamPlayer>{1F3E974C-F180-45EB-AB59-4D1ACF4BB855}+00000000</TeamPlayer>

<TeamPlayer>{3F9BEEE0-35DB-4835-A89E-F2B240EC2CB0}+00000000</TeamPlayer>
    </Team>
  </Teams>
  <Players>
    <Player id="{0EA17FA0-D21B-4F1E-8B11-A250A6CF266C}+00000000"
name="Gary Neville"></Player>
    <Player id="{1F3E974C-F180-45EB-AB59-4D1ACF4BB855}+00000000"
name="Louis Saha"></Player>
    <Player id="{3F9BEEE0-35DB-4835-A89E-F2B240EC2CB0}+00000000"
name="Ryan Giggs"></Player>
  </Players>
</Teams_and_Players>


The xslt written to list the teams and players is :

<?xml version='1.0'?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output method="xml"/>

<xsl:key name="player-id" match="Teams_and_Players/Players/Player"
use="@id"/>

<xsl:template match="/">
  <xsl:apply-templates select="Teams_and_Players"/>
</xsl:template>

<xsl:template match="Teams_and_Players">
 <Teams>
  <xsl:apply-templates select="Teams"/>
 </Teams>
</xsl:template>

<xsl:template match="Teams">
  <xsl:apply-templates select="Team"/>
</xsl:template>

<xsl:template match="Team">
  <Team>
  <xsl:value-of select="@name"/>
  <xsl:apply-templates select="TeamPlayer"/>
  </Team>
</xsl:template>

<xsl:template match="TeamPlayer">
  <Player>
  <xsl:value-of select="key('player-id', @id)"/>
  </Player>
</xsl:template>
</xsl:stylesheet>

Currently the following is output:

<?xml version="1.0" encoding="UTF-8"?>
<Teams>
  <Team>Man Utd
    <Player/>
    <Player/>
    <Player/>
  </Team>
</Teams>

Has anyone got any clues about what is wrong with?

<xsl:key name="player-id" match="Teams_and_Players/Players/Player"
use="@id"/>

or

<xsl:value-of select="key('player-id', @id)"/>

Best regards,

Mike


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