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[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] xsl:for-each-group, group-starting-with, nested
 Hello all,
I've been lurking and searching a bit to see if anyone had a similar
discussion on this, but I haven't seen anything quite like this. I
apologize if I've missed something and am repeating.
The challenge was to wrap parts of XML files in a tag called "split"
based on a marker that could occur essentially anywhere in the XML file
(but not inside a mixed content node). At this point in the process, I
had neither the option to limit the rules where the <splithere/> marks
could be made, nor the structure of the (several sets of) XML. I needed
a data-blind master key.
The content could be as simple as this:
<Chapter>
<Title>Whales</Title>
<splithere/>
<Section>
<Head>Types</Head>
<Para>La la la</Para>
<Para>La la la</Para>
</Section>
<splithere/>
<Section>
<Head>Colors</Head>
<Para>La la la</Para>
<Para>La la la</Para>
</Section>
</Chapter>
Or as complex as this:
<OtherChapter>
<Metainformation/>
<splithere/>
<Frontmatter>
<Cover/>
<People/>
<TOC/>
</Frontmatter>
<Sprockets>
<Sprocket>
<Introduction>
<splithere/>
<Section>
<Head/>
<Para/>
</Section>
</Introduction>
</Sprocket>
</Sprockets>
<Widgets>
<splithere/>
<Part>
<PartTitle/>
<splithere/>
<Widget>
<Intro>
<splithere/>
<Section>
<Head/>
<Section>
<Head/>
<Para/>
<Table/>
</Section>
</Section>
<splithere/>
<Section>
<Head/>
<Section>
<Head/>
<Para/>
</Section>
<Section>
<Head/>
</Section>
<Section>
<Head/>
</Section>
</Section>
</Intro>
</Widget>
</Part>
<splithere/>
<References>
<Head/>
<RefList/>
</References>
</Widgets>
</OtherChapter>
I thought, hey, I'll try this nifty new grouping method in XSLT 2.0, as
my first official foray into the new stuff. (I've been writing 1.0 for a
couple of years.). I'm using Saxon B, release 8.1.1.
So this is what I came up with:
<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes" encoding="UTF-8" />
<xsl:template match="* | @* | text()">
<xsl:choose>
<xsl:when test="splithere or descendant::splithere">
<xsl:call-template name="splitter"/>
</xsl:when>
<xsl:otherwise>
<xsl:copy>
<xsl:apply-templates select="* | @* | text()"/>
</xsl:copy>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template name="spliter">
<xsl:element name="{name()}">
<xsl:for-each select="@*">
<xsl:attribute name="{name(.)}"><xsl:value-of
select="."/></xsl:attribute>
</xsl:for-each>
<xsl:choose>
<xsl:when test="splithere">
<xsl:for-each-group select="*"
group-starting-with="splithere">
<chunk>
<xsl:choose>
<xsl:when
test="current-group()/splithere">
<xsl:for-each-group
select="current-group()" group-starting-with="splithere">
<chunk>
<xsl:for-each
select="current-group()">
<xsl:call-template name="splitter"/>
</xsl:for-each>
</chunk>
</xsl:for-each-group>
</xsl:when>
<xsl:otherwise>
<xsl:for-each
select="current-group()">
<xsl:call-template
name="splitter"/>
</xsl:for-each>
</xsl:otherwise>
</xsl:choose>
</chunk>
</xsl:for-each-group>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates select="* | @* |
text()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
But it leaves a lot of muck of extra tags in the file, like this:
<Chapter>
<split>
<Title>Whales</Title>
</split>
<split>
<splithere/>
<Section>
<Head>Types</Head>
<Para>La la la</Para>
<Para>La la la</Para>
</Section>
</split>
<split>
<splithere/>
<Section>
<Head>Colors</Head>
<Para>La la la</Para>
<Para>La la la</Para>
</Section>
</split>
</Chapter>
So I have a little fixer to follow it up, going back XSLT version 1.1
with an older saxon, I think 7-6-5a:
<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet version="1.1"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes" encoding="UTF-8" />
<xsl:template match="* | @* | text()">
<xsl:copy>
<xsl:apply-templates select="* | @* | text()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="split">
<xsl:choose>
<xsl:when test="splithere=true()">
<split>
<xsl:apply-templates/>
</split>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates/></xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
To give me this (desired output):
<Chapter>
<Title>Whales</Title>
<split>
<splithere/>
<Section>
<Head>Types</Head>
<Para>La la la</Para>
<Para>La la la</Para>
</Section>
</split>
<split>
<splithere/>
<Section>
<Head>Colors</Head>
<Para>La la la</Para>
<Para>La la la</Para>
</Section>
</split>
</Chapter>
I'd rather correct my initial code than correct it with another program.
Does anyone see my mistake, the one causing the extra <split> tags? I
think I've just banged my head on this a few too many times...
Thanks in advance,
Kate Atkins
Silverchair Science + Communications
http://www.silverchair.com
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