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

[Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>]

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: [xsl] 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
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