Within xsl:for-each-group, current-group() selects all the nodes in the
group being processed, whereas "." selects only the first node in that
group. Writing "." is equivalent to writing current-group()[1].
Michael Kay
http://www.saxonica.com/
-----Original Message-----
From: john jacks [mailto:john(_dot_)jacks(_at_)yahoo(_dot_)co(_dot_)uk]
Sent: 05 April 2007 08:28
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: RE: [xsl] Recursive positional grouping (was xsl digest...)
Thanks Michael.
(As Abel pointed out, I'm replying to the digest since that's
what I receive).
This works nicely. I don't understand the difference between
<xsl:apply-templates select="."/>
and
<xsl:apply-templates select="current-group()"/>
within the xsl:for-each-group instruction.
The book says ' use current-group() is sometimes better
especially if the group includes elements of different types'
which this example does.
How can I understand the difference please?
JJ
From: "Michael Kay" <mike(_at_)saxonica(_dot_)com>
Subject: RE: [xsl] Recursive positional grouping (was xsl digest...)
Message-ID: <009e01c7769e$d165d290$6401a8c0(_at_)turtle>
I think your problem is that
<xsl:apply-templates select="current-group()"/>
is processing all the elements in a group, not only the
next-level headings
- so the paragraphs are output at every level.
I think this kind of recursive grouping works best if you use
a named template that is passed the contents of a group as a
parameter. Try something like this:
<?xml version="1.0" encoding="ISO-8859-1"?> <xsl:stylesheet
version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";;
xmlns:xs="http://www.w3.org/2001/XMLSchema";;>
<xsl:output indent="yes"/>
<xsl:template name="group">
<xsl:param name="pop" as="element()*"/>
<xsl:param name="level" as="xs:integer" />
<xsl:variable name="key" as="xs:string" select="concat('h',
$level)"/>
<xsl:for-each-group select="$pop"
group-starting-with="*[name() eq $key]">
<xsl:choose>
<xsl:when test="starts-with(name(.), 'h')">
<section level="{$level}">
<head><xsl:apply-templates
select="current-group()[1]"/></head>
<xsl:call-template name="group">
<xsl:with-param name="pop"
select="remove(current-group(), 1)"/>
<xsl:with-param name="level" select="$level + 1"/>
</xsl:call-template>
</section>
</xsl:when>
<xsl:otherwise>
<xsl:copy-of select="current-group()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each-group>
</xsl:template>
<xsl:template match="/">
<doc>
<xsl:call-template name="group">
<xsl:with-param name="pop" select="body/*"/>
<xsl:with-param name="level" select="1"/>
</xsl:call-template>
</doc>
</xsl:template>
</xsl:stylesheet>
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