[xsl] Trying to match elements NOT found in external document

Subject: [xsl] Trying to match elements NOT found in external document
From: "G. T. Stresen-Reuter" <tedmasterweb@xxxxxxxxx>
Date: Tue, 31 Mar 2009 20:04:55 +0100

It's been a while since I've written. I hope this email finds everyone doing well... on to business...

I'm trying to match items in the source XML document that are NOT present in an external XML document.

For example, Given the following XML documents I would like to match the atom:entry element whose atom:id = xyz by virtue of the fact that there is no corresponding email story with the same id.

        <atom:title>Story 1</atom:title>
        <atom:title>Story 2</atom:title>
        <atom:title>Story 3</atom:title>


I've tried the following and in spite of the fact that most documentation states that keys include documents included via the document() function, I've been unable to verify that this is true. Here is the stylesheet I've tried to no avail:

<xsl:key name="emailedstories" match="id" use="normalize-space(.)" />

<!-- there are many references to emailedstories.xml prior to the line below, for example -->
<xsl:for-each select="document('../subscriptions/emailedstories.xml')/ emails/email">

<!-- to select just the entry elements that are NOT in the emailedstories.xml file, I've been trying this -->
<xsl:apply-templates select="atom:entry[count(key('emailedstories', atom:id)) = 0]" />

This doesn't work. I suspect I'm confused about what the context node is and/or about comparing node sets vs. strings/numbers.

Does anyone have any suggestions on how to do what I'm trying to do?

Many thanks in advance!


G. T. Stresen-Reuter
Web: http://tedmasterweb.com
Blog: http://tecnotertulia.com
Twitter: http://twitter.com/tedmasterweb

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