Re: How to use xsl:key to get all values?

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Subject: Re: How to use xsl:key to get all values?
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Thu, 12 Apr 2001 18:11:41 +0100

Hello Di,

At 10:45 PM 4/12/01, you wrote:

Hi,

Based on the following XML and XSL file, I'd like to output "1"  "2". But I
just get "1" "1". Any body can tell me what is wrong with
<xsl:key>

Nothing's wrong with it, it's working fine.

xsl:key indexes nodes across the entire document. When you write

<xsl:variable name="child" select="key('key-name', 'a1')" />

You are setting the variable $child to be *all* the nodes that match the key with key value 'a1'. In your example, there are two such nodes, and you always get both of them regardless of the context node (since the value you give is always 'a1').

When you ask for

<xsl:value-of select="$child/@value" />

You get the value of the node set, which is defined as the string value of the first node in the node set in document order. That's always the same node, the one with value='1', because the node set is always the same and document order doesn't change either.

It's unclear why you are using the key. Why not just:
  <xsl:for-each select="CC">
    <xsl:value-of select="DD/EE/@value" />
  </xsl:for-each>

?

Hope that helps,
Wendell

p.s. what's that namespace declaration xmlns="http://www.w3.org/TR/WD-xsl" doing for you anyhow?

<?xml version="1.0"?>
<AA>
        <BB>
                <CC>
                        <DD>
                                <EE aField="a1" value="1"/>
                        </DD>
                </CC>
                <CC>
                        <DD>
                                <EE aField="a1" value="2"/>
                        </DD>
                </CC>
        </BB>
</AA>


<?xml version="1.0"?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
        xmlns="http://www.w3.org/TR/WD-xsl" version="1.0">

    <xsl:output method="text"/>
    <xsl:key name="key-name" match="EE" use="@aField" />
    <xsl:template match="AA/BB">
        <xsl:for-each select="CC">
                <xsl:variable name="child" select="key('key-name', 'a1')" />
                        <xsl:value-of select="$child/@value" />
          </xsl:for-each>
    </xsl:template>

</xsl:transform>


======================================================================
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
======================================================================

XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list

Current Thread
How to use xsl:key to get all values? Di Luo - Thu, 12 Apr 2001 17:46:27 -0400 (EDT) Wendell Piez - Thu, 12 Apr 2001 18:11:14 -0400 (EDT) <= Di Luo - Thu, 12 Apr 2001 18:33:13 -0400 (EDT) Michael Kay - Thu, 12 Apr 2001 18:43:11 -0400 (EDT) Jeni Tennison - Fri, 13 Apr 2001 06:04:15 -0400 (EDT)

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