Use of xsl:key to perform node traversal according to

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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