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RE: match by arbitrary number of criteria

Subject: RE: match by arbitrary number of criteria
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Mon, 4 Jun 2007 09:39:54 +0100
RE:  match by arbitrary number of criteria
You're misusing the contains() function here: instead of contains(subjects,
$included) you should do subjects/subject=$included which returns true if
any of the subject children is equal to $included.

Note that when comparing two node-sets $s1 = $s2 the result is true if there
is some node in $s1 that is equal to some node in $s2. So you want: 

<xsl:variable name="s" select="subjects/subject"/>
<xsl:variable name="i" select="$config//included/subject"/>
<xsl:variable name="e" select="$config//excluded/subject"/>


... not($i[not($s = .)]) and not($e = $s)

Michael Kay

> -----Original Message-----
> From: John Horner [mailto:Horner.John@xxxxxxxxxx] 
> Sent: 04 June 2007 07:11
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  match by arbitrary number of criteria
> I've got XML roughly like this:
> <items>
> 	<item>
> 		<name>foo</name>
> 		<subjects>
> 			<subject>Science</subject>
> 			<subject>Politics</subject>
> 			<subject>History</subject>
> 		</subjects>
> 	</item>
> 	<item>
> 		<name>bar</name>
> 		<subjects>
> 			<subject>Science</subject>
> 			<subject>History</subject>
> 			<subject>Art</subject>
> 		</subjects>
> 	</item>
> </items>
> 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"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
> 	<xsl:param name="included" select="'Science'"/>
> 	<xsl:param name="excluded" select="'Politics'"/>
> 	<xsl:template match="//item">
> 		<xsl:if test="contains(subjects,$included) and 
> not(contains(subjects,$excluded))">
> 			<xsl:value-of select="name"/>
> 		</xsl:if>
> 	</xsl:template>
> </xsl:stylesheet>
> 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:
> <config>
> 	<included>
> 		<subject>Science</subject>
> 		<subject>History</subject>
> 	</included>
> 	<excluded>
> 		<subject>Politics</subject>
> 	</excluded>
> </config>
> Allowing an arbitrary number of inclusions and exclusions, 
> how would I efficiently test each item?
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