Given this input:
--------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<foo>
<seq><k/><o/><p/><c/><f/></seq>
<seq><d/><e/><f/><g/></seq>
<seq><k/><f/><z/></seq>
<seq><a/><b/><c/><d/></seq>
</foo>
--------------------------------------
applying this XSLT:
--------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet
xmlns:xs="http://www.w3.org/2001/XMLSchema";
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:my="URN:my"
version="2.0" >
<xsl:output
method="xml"
indent="yes"
/>
<xsl:template match="/">
<xsl:apply-templates />
</xsl:template>
<xsl:template match="foo">
<xsl:copy>
<xsl:for-each-group select="seq/*" group-by="name(.)" >
<xsl:sort select="my:sortkey(.)"/>
<xsl:element name="{current-grouping-key()}" />
</xsl:for-each-group>
</xsl:copy>
</xsl:template>
<xsl:function name="my:sortkey" as="xs:integer?">
<xsl:param name="input" as="element(*)" />
<xsl:variable name="preceding-siblings"
select="$input/../../seq/*[name() =
name($input)]/preceding-sibling::*[1]" as="element(*)*" />
<xsl:sequence select="if ($preceding-siblings) then max(for $ps in
$preceding-siblings return my:sortkey($ps)) + 1 else 1"/>
</xsl:function>
</xsl:stylesheet>
--------------------------------------
I receive:
--------------------------------------
<foo>
<k/>
<a/>
<o/>
<b/>
<p/>
<c/>
<d/>
<e/>
<f/>
<g/>
<z/>
</foo>
--------------------------------------
Does that make sense?
If I include <o/> at the other position, i.e.,
<seq><k/><f/><z/><o/></seq>,
I receive "Too many nested function calls. May be due to infinite
recursion." as expected.
Gerrit
On 08.04.2010 16:38, Michael Kay wrote:
There is an arbitrary number of sequences, sometimes
containing items
with the same name:
(k, o, p, c, f)
(d, e, f, g)
(k, f, z, o)
(a, b, c, d)
I want to create a master sequence which contains every item once,
preserving the original order.
Doesn't xsl:for-each-group over combined sequence solves the problem?
No, it puts groups in order of first appearance, which would put f before d.
Regards,
Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay
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