Mike,
Thanks. I won't have time to look at this until
tonight. Hopefully I'll be able to put it all together
then.
Don
--- Michael Kay <mike(_at_)saxonica(_dot_)com> wrote:
A tricky one, it has come up before but I don't
think it will be easy to
find the thread. On that occasion I think the break
was indicated by a
<newpage/> element that could appear at any depth,
but the principle is the
same.
I think the basic approach is this. When processing
a <point> that contains
a descendant <newpage/>, you need to split it into
two <point> elements, the
first containing everything before the <newpage/>,
the second containing
everything after. And it also applies recursively,
of course, to the
children. So it's something like this:
<xsl:template match="point">
<xsl:copy-of select="."/>
</xsl:template>
<xsl:template match="point[descendant::newpage]">
<xsl:variable name="this" select="."/>
<xsl:variable name="np"
select="descendant::newpage[1]"/>
<point id="{(_at_)id}" part="1">
<xsl:apply-templates select="child::node()[. <<
$np or (. intersect
$np/ancestor::node())]"/>
</point>
<newpage/>
<xsl:variable name="remainder as="element(point)">
<point id="{(_at_)id}" part="{1+position()}">
<xsl:copy-of select="$this/child::node()[. >>
$np or (. intersect
$np/ancestor::node())]"/>
</point>
</xsl:variable>
<xsl:apply-templates select="$remainder"/>
</xsl:template>
This basically creates a structure in which the
<newpage/> elements are
propogated to the top level, and every ancestor of a
<newpage/> element is
duplicated either side of this element, but with
unsplit <point> elements
appearing one side or the other. You've then got a
simpler second stage of
processing in which the pages are identified at the
top level (quite
possibly you can do this in the same pass but I
think it's useful to get the
basic splitting logic right first).
I've used some 2.0 constructs here (and for clarity
I've used the << and >>
operators without escaping) but they can probably
all be translated into 1.0
equivalents with a bit of ingenuity and verbosity.
You can probably substitute point[newSlide='true']
for my <newpage/>
elements, it will add a little bit of extra
complexity. I'd suggest getting
this working on a simplified version of the problem
first and when you've
got something that works, extend it to handle the
real problem.
This is untested and almost certainly contains bugs,
but I hope the general
idea comes across.
Michael Kay
http://www.saxonica.com/
-----Original Message-----
From: Don Smith [mailto:dtsmithisogen(_at_)yahoo(_dot_)com]
Sent: 19 June 2007 08:48
To: XSLT
Subject: [xsl] grouping nesting items, including
following items
I can't quite figure out how to group nested items
and also
pick up items on the following axis for a given
group. Here's
a sample source:
<slide title="Introduction" id="x1">
<point id="x2" >
<text>First point</text>
<subpoints id="x3">
<point id="x3a">
<text>First point, subpoint 1</text>
</point>
<point id="x3b">
<text>First point, subpoint 2</text>
</point>
<point id="x3c">
<text>First point, subpoint 3</text>
<subpoints id="x3c1">
<point id="x3c1a" newSlide="true"
title="Intro (cont.)">
<text>First point, subpoint 3, sub-subpoint
1 on new
slide</text>
</point>
<point id="x3c1b">
<text>First point 4, subpoint 3,
sub-subpoint 2 on new
slide</text>
</point>
</subpoints>
</point>
<point id="x4d">
<text>First point, subpoint 4 on new
slide</text>
</point>
</subpoints>
</point>
<point id="x5" >
<text>Second point, on new slide</text>
</point> </slide>
Note the attribute "newSlide" on <point
id="x3c1a">: I need
this element, all its descendants (if any), and
everything
that follows, to be in a different group than
everything that
comes before. Ideally, this would mean each group
is placed
in its own document using <xsl:result-document>.
This is just one example, but "newSlide='true'"
can occur on
any <point> or even any <subpoints>.
Thanks,
Don
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