Re: [xsl] Problem with Key matching XSLT 1.0

Subject: Re: [xsl] Problem with Key matching XSLT 1.0
From: Martin Honnen <Martin.Honnen@xxxxxx>
Date: Tue, 14 Sep 2010 12:32:09 +0200
Etheridge, Stephen wrote:

I am trying to compare two xml documents of the same format.  I have
successfully transformed the documents to include a field called ItemKey
which includes a unique key (comprised of four other elements).  I am
now trying to match and compare elements based on that key value.

My XSLT includes the following as "global" variables:

<xsl:variable name="file1">test_comp4.xml</xsl:variable>
<xsl:variable name="old_file"
<xsl:variable name="file2">test_comp4_edited.xml</xsl:variable>
<xsl:variable name="new_file"
<xsl:output method="xml" indent="yes"/>
<xsl:key name="test" match="//ItemKey" use="//ItemKey"/>

First of all, in a pattern like the match attribute you never need to start with "//", match="ItemKey" is enough, doing match="//ItemKey" does not gain anything.
match="//ItemKey" use="//ItemKey"
looks very odd, usually the "use" attribute selects an attribute (e.g. use="@foo") or a child element (e.g. use="bar") or the node itself (e.g. use=".") but putting use="//ItemKey" looks wrong, that way you "key" any "ItemKey" element on any "ItemKey" element in the document.


	Martin Honnen

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