At 2010-11-30 15:43 -0600, Steve Ylvisaker wrote:
I want to nest sections from a flat XML file based on the value of a
section attribute. I have done this before with a similar but
slightly different situation. I'm missing something with the
behavior of xsl:for-each-group.
Actually, you missed a very basic first step and were off on a
tangent with your testing. Once that first step is made correctly,
then it was just a matter of finding out what was missing.
<xsl:template match="/">
<xsl:variable name="unflattenedDoc">
<book>
<xsl:copy>
<xsl:for-each-group select="*"
group-starting-with="section[(_at_)label=1]">
Note that you are selecting all of the children of the *root* node,
not of the document element ... in my example before I'm selecting "*/*".
With that first step made correctly, then the rest falls into place.
I hope the answer below helps.
. . . . . . . . . Ken
p.s. I'm assuming your "pass2" is going to eventually be more
detailed than simply preserving the nodes, because if not then you
don't need the second pass.
T:\ftemp>type steve.xml
<?xml version="1.0" encoding="UTF-8"?>
<book type="Tech_Manual">
<bookinfo>
<title>client manual</title>
<subtitle>performance data</subtitle>
</bookinfo>
<section id="a--21" label="1">
<title lang="en">Preface</title>
<para>some interesting stuff</para>
</section>
<section id="a--22" label="2">
<title lang="en">Preface</title>
<para>some more interesting stuff</para>
</section>
<section id="a--23" label="2">
<title lang="en">Preface</title>
<para>some more interesting stuff</para>
</section>
<section id="a--24" label="3">
<title lang="en">Preface</title>
<para>some more interesting stuff</para>
</section>
<section id="a--25" label="1">
<title lang="en">Cautions</title>
<para>some interesting stuff</para>
</section>
</book>
T:\ftemp>call xslt2 steve.xml steve.xsl
<?xml version="1.0" encoding="utf-8"?>
<book>
<bookinfo>
<title>client manual</title>
<subtitle>performance data</subtitle>
</bookinfo>
<section id="a--21" label="1">
<title lang="en">Preface</title>
<para>some interesting stuff</para>
<section id="a--22" label="2">
<title lang="en">Preface</title>
<para>some more interesting stuff</para>
</section>
<section id="a--23" label="2">
<title lang="en">Preface</title>
<para>some more interesting stuff</para>
<section id="a--24" label="3">
<title lang="en">Preface</title>
<para>some more interesting stuff</para>
</section>
</section>
</section>
<section id="a--25" label="1">
<title lang="en">Cautions</title>
<para>some interesting stuff</para>
</section>
</book>
T:\ftemp>type steve.xsl
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:xs="http://www.w3.org/2001/XMLSchema";
exclude-result-prefixes="xs">
<xsl:output
method="xml"
omit-xml-declaration="no"
encoding="utf-8"
indent="yes"/>
<xsl:strip-space elements="*"/>
<!-- Pass one - recognize section headers and create nested <sections/> -->
<xsl:template match="/">
<xsl:variable name="unflattenedDoc">
<book>
<xsl:copy>
<xsl:for-each-group select="*/*"
group-starting-with="section[(_at_)label=1]">
<xsl:apply-templates select="." mode="group"/>
</xsl:for-each-group>
</xsl:copy>
</book>
</xsl:variable>
<xsl:apply-templates select="$unflattenedDoc" mode="pass2"/>
</xsl:template>
<xsl:template match="section[(_at_)label=1]" mode="group">
<section>
<xsl:copy-of select="@*"/>
<xsl:apply-templates mode="group"/>
<xsl:for-each-group select="current-group()[position()>1]"
group-starting-with="section[(_at_)label=2]">
<xsl:apply-templates select="." mode="group"/>
</xsl:for-each-group>
</section>
</xsl:template>
<xsl:template match="section[(_at_)label=2]" mode="group">
<section>
<xsl:copy-of select="@*"/>
<xsl:apply-templates mode="group"/>
<xsl:for-each-group select="current-group()[position()>1]"
group-starting-with="section[(_at_)label=3]">
<xsl:apply-templates select="." mode="group"/>
</xsl:for-each-group>
</section>
</xsl:template>
<xsl:template match="section[(_at_)label=3]" mode="group">
<section>
<xsl:copy-of select="@*"/>
<xsl:apply-templates mode="group"/>
</section>
</xsl:template>
<xsl:template match="node()" mode="group">
<xsl:copy-of select="."/> </xsl:template>
<!-- 2nd pass -->
<xsl:template match="book" mode="pass2">
<xsl:copy-of select="."/>
</xsl:template>
</xsl:stylesheet>
T:\ftemp>rem Done!
--
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