[xsl] match by arbitrary number of criteria

Subject: [xsl] match by arbitrary number of criteria
From: "John Horner" <Horner.John@xxxxxxxxxx>
Date: Mon, 4 Jun 2007 16:10:58 +1000
I've got XML roughly like this:


Where each item, as you can see, is categorised.

I'm transforming them, using parameters for inclusion and exclusion,
roughly like this:

<xsl:stylesheet version="1.0"
	<xsl:param name="included" select="'Science'"/>
	<xsl:param name="excluded" select="'Politics'"/>
	<xsl:template match="//item">
		<xsl:if test="contains(subjects,$included) and
			<xsl:value-of select="name"/>

Which selects "bar", because its subjects match the included string and
don't match the excluded string.

So, all well and good if I only ever have one of each, but now I need to
add more. What if I might have any number of inclusions and exclusions?
Say I had a config file like this:


Allowing an arbitrary number of inclusions and exclusions, how would I
efficiently test each item?

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