Thanks Michael, that really helped to get it right.
$ xsltproc i.xsl some.xml | tidy -q -xml
<?xml version="1.0"?>
<out xmlns:data="data">
<ns1>
<flag xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>A</flag>
<flag xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>B</flag>
</ns1>
<ns2>
<flag xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>A</flag>
<flag xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>C</flag>
</ns2>
<int>
<flag xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>A</flag>
</int>
<uni>
<flag xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>B</flag>
<flag xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>A</flag>
<flag xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>C</flag>
</uni>
</out>
$
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:data="data"
<data:data>
<flags>
<flag>A</flag>
<flag>B</flag>
</flags>
<flags>
<flag>A</flag>
<flag>C</flag>
</flags>
</data:data>
<xsl:template match="/">
<xsl:variable name="ns1" select="document('')//flags[1]/flag"/>
<xsl:variable name="ns2" select="document('')//flags[2]/flag"/>
<xsl:variable name="intersection" select="$ns1[. = $ns2]"/>
<xsl:variable name="union" select="$ns1[not(. = $ns2)] | $ns2"/>
<out>
<ns1><xsl:copy-of select="$ns1"/></ns1>
<ns2><xsl:copy-of select="$ns2"/></ns2>
<int><xsl:copy-of select="$intersection"/></int>
<uni><xsl:copy-of select="$union"/></uni>
</out>
</xsl:template>
</xsl:stylesheet>
Mit besten Gruessen / Best wishes,
Hermann Stamm-Wilbrandt
Level 3 support for XML Compiler team and Fixpack team lead
WebSphere DataPower SOA Appliances
https://www.ibm.com/developerworks/mydeveloperworks/blogs/HermannSW/
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From: Michael Kay <mike(_at_)saxonica(_dot_)com>
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com,
Date: 03/28/2012 01:39 PM
Subject: Re: [xsl] Question on Kaysian method for set intersection
On 28/03/2012 12:16, Hermann Stamm-Wilbrandt wrote:
I used Kaysian method as described in this document (section 1c), sofar:
http://www.xml.org//sites/www.xml.org/files/xslt_efficient_programming_techniques.pdf#page=3
Now I wanted to use it similarly for nodesets from different parts of
document.
That does not work because /flags[1]/flag[.='A'] is not the same node
as /flags[2]/flag[.='A'].
Is it possible to get the flag with "A" for $int and flags for "A", "B"
and
"C" for $uni?
If so, with keys?
The so-called Kaysian method is a way of doing identity-based node-set
intersection and difference in XSLT 1.0, which does not offer the
"intersect" and "except" operators.
You seem to be wanting to do equality-based intersection and difference,
which is actually much simpler, for example
$x/ns1/flags/flag[not(. = $x/ns2/flags/flag)]
selects the flags that are in ns1 but not in ns2.
Michael Kay
Saxonica
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