Within your <xsl:template match="sect_break">, the <xsl:apply-templates>
instruction does nothing, because sect_break has no children. So there's
nothing here that will change prev_depth from its initial value.
You will find code for solving this problem in my 2004 paper
http://www.idealliance.org/proceedings/xml04/papers/111/mhk-paper.html
Michael Kay
http://www.saxonica.com/
-----Original Message-----
From: Tom Schmitter [mailto:toms(_at_)moto-research(_dot_)com]
Sent: 20 July 2008 17:43
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] parameter getting lost in tunnel?
Hi List,
I've been struggling for more hours than I care to admit on a
simple task
- passing a parameter through a series of templates using
tunnel="yes".
For some reason my parameter seems to be lost along the way
and inevitably ends up with the default value (0).
In the abbreviated "sect_break" template below, the param "prev_depth"
should start out at 0 then be set to 1 as it's passed through
apply-templates the first time. But the next time sect_break
is called, prev_depth is 0 (or whatever default is specified
in the param's select):
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:xs="http://www.w3.org/2001/XMLSchema";
xmlns:fn="http://www.w3.org/2005/xpath-functions";>
<xsl:output method="xml" version="1.0" encoding="UTF-8"
indent="yes"/>
<xsl:template match="/">
<xsl:apply-templates/>
</xsl:template>
<xsl:template match="sect_break">
<!-- prev_depth is the depth that we were at before
encountering this sect_break -->
<xsl:param name="prev_depth" select="0" tunnel="yes"/>
<!-- depth is the depth indicated in the current
sect_break -->
<xsl:variable name="depth" select="./@depth" as="xs:integer"/>
<xsl:variable name="direction" select="$depth - $prev_depth"
as="xs:integer"/>
<xsl:choose>
<xsl:when test="$direction > 0">
<!-- going deeper in depth -->
sect_break depth=<xsl:value-of select="$depth"/>
<xsl:apply-templates>
<xsl:with-param name="prev_depth" select="$depth"
tunnel="yes" />
</xsl:apply-templates>
</xsl:when>
<!-- some other cases have been omitted for brevity -->
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
Sample input:
<doc>
<sect_break depth="1"/>
<sect_break depth="2"/>
<sect_break depth="2"/>
<sect_break depth="3"/>
<sect_break depth="1"/>
</doc>
(fwiw, the objective is to create a nested hierarchy from one
that is defined unnested. eg:
<level 1>
<level 2>
<level 2>
<level 3>
<level 1>
becomes:
<level 1>
<level 2>
</level>
<level 2>
<level 3>
</level>
</level>
</level>
<level 1>
</level>
)
Thanks very much for any help!
--Tom
(using xmlspy)
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