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RE: Use of xsl:key to perform node traversal according

Subject: RE: Use of xsl:key to perform node traversal according to an association between nodes
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Wed, 26 Sep 2007 11:34:24 -0400
RE:  Use of xsl:key to perform node traversal according
Mike,

At 10:29 AM 9/26/2007, Brad wrote:
I think it's correct except for:
<xsl:value-of select="key('player-id', @id)"/>

which should be changed to:
<xsl:value-of select="key('player-id', .)"/>

because it's the content for TeamPlayer that you need to match to the key entries. TeamPlayer does not have an id attribute.

Also, once you've correctly selected the Player node, you presumably want to output its @name, not its value (since it's empty).


So that would be

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

Or there might be times (with problems of real-world complexity) when you even want to do:

<xsl:apply-templates select="key('player-id', .)" mode="name"/>

<xsl:template match="Player" mode="name">
  <xsl:value-of select="@name"/>
</xsl:template>

Cheers,
Wendell

-----Original Message-----
From: Dunk, Michael (Mike) [mailto:mikedunk@xxxxxxxxxxxxx]
Sent: September 26, 2007 10:15 AM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Use of xsl: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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======================================================================
Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
Mulberry Technologies, Inc.                http://www.mulberrytech.com
17 West Jefferson Street                    Direct Phone: 301/315-9635
Suite 207                                          Phone: 301/315-9631
Rockville, MD  20850                                 Fax: 301/315-8285
----------------------------------------------------------------------
  Mulberry Technologies: A Consultancy Specializing in SGML and XML
======================================================================

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