If you define a key like this:
<xsl:key name="branch_services" match="branch" use="service/@id"/>
Then you can find out how many branches have a particular service like this:
count(key('branch_services',@id))
And so if the count is less than the total number of branches, then not
every branch has that service.
So, adding some muenchian grouping to get unique services, I think this
should give you the nodeset you need:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:key name="services" match="service" use="@id"/>
<xsl:key name="branch_services" match="branch" use="service/@id"/>
<xsl:variable name="branches" select="count(//branch)"/>
<xsl:variable name="service_nodes" select="//service[generate-id(.) =
generate-id(key('services'
,@id)[1])][count(key('branch_services',@id)) < $branches]"/>
<xsl:template match="/">
<doc>
<xsl:for-each select="$service_nodes">
<xsl:copy-of select="."></xsl:copy-of>
</xsl:for-each>
</doc>
</xsl:template>
</xsl:stylesheet>
Hope this helps,
David.
--
David McNally Moody's Investors Service
Software Engineer 99 Church St, NY NY 10007
David(_dot_)McNally(_at_)Moodys(_dot_)com (212) 553-7475
-----Original Message-----
From: Adam van den Hoven [mailto:list(_at_)adamvandenhoven(_dot_)com]
Sent: Thursday, September 25, 2003 12:26 PM
To: XSL Mailing List
Subject: [xsl] Problems selecting the right nodes.
I have a nodeset or arbitrary length that contains a set of
tags which
look something like:
<branch id="br1">
<service id="service1" />
<service id="service2" />
<service id="service3" />
</branch>
<branch id="br2">
<service id="service1" />
<service id="service4" />
</branch>
Now what I want is a nodeset that contains (uniquely) all the
services
that do not occur in all the branches. In this case I want
service 2, 3
and 4 but not 1
My original solution was iffy. I ended up creating a tokenized string
("Service2|Service3|Service4" in this case) which I then ran
through a
recursive named template which did a lot of substring-before and
substring-after. Since what I cared about are the ids, that was fine.
However, the input file is occasionally very large so this can take a
very long time. I want to find a better solution.
If possible, I think I'd like to avoid using extension
functions, unless
there is an obvious performance boost.
Any thoughts?
Adam
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