Subject: Re: [xsl] breaking up XML on page break element|
From: "Imsieke, Gerrit, le-tex gerrit.imsieke@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 16 Jul 2014 21:49:54 -0000
What a great, cool, solution! I think of applying this to split FO page-sequences.
Because we will have to deal with very large documents the question of streaming comes to my mind. I have not yet looked up the many many restrictions for streamable expressions, but does anyone of you have a feeling whether streaming could be used here? Like: Process each segment of relevant nodes separately.
Thanks for your suggestions,
Am 04.07.2014 um 20:20 schrieb Imsieke, Gerrit, le-tex gerrit.imsieke@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>:
<?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">
<xsl:template match="* | @*" mode="#default"> <xsl:copy> <xsl:apply-templates select="@*, node()" mode="#current"/> </xsl:copy> </xsl:template>
<xsl:template match="book" mode="#default"> <xsl:variable name="context" select="." as="element(book)" /> <xsl:copy> <xsl:for-each-group select="descendant::node()[not(node())]" group-starting-with="pb"> <xsl:copy-of select="self::pb"/> <xsl:apply-templates select="$context/*" mode="split"> <xsl:with-param name="restricted-to" select="current-group()/ancestor-or-self::node()" tunnel="yes"/> </xsl:apply-templates> </xsl:for-each-group> </xsl:copy> </xsl:template>
<xsl:template match="node()" mode="split"> <xsl:param name="restricted-to" as="node()+" tunnel="yes" /> <xsl:if test="exists(. intersect $restricted-to)"> <xsl:copy> <xsl:copy-of select="@*" /> <xsl:apply-templates mode="#current" /> </xsl:copy> </xsl:if> </xsl:template>
<xsl:template match="pb" mode="split"/>
On 04.07.2014 18:31, Geert Bormans geert@xxxxxxxxxxxxxxxxxxx wrote:Thanks Gerrit, (I admit I need to read this twice to get it, but that might be caused by the 0-1 and me not trying to miss all of the fun in Rio) I will look into it after the match
At 17:18 4/07/2014, you wrote:I tackle it by what I call C"b,Eupward projectionC"b,B:
When processing the top-level element, do a for-each-group of all descendants that are terminal nodes (those without children), with a group-starting-with at the splitting points.
For each group, process the book (or the HTML body, or whatever common ancestor there is) once in another mode, with a tunneled parameter 'restricted-to' that contains, for each group, the terminal nodes and their ancestors.
When processing each group, for each node that you encounter, test whether the node is contained in the tunneled variable (using intersect). If it is, reproduce the node and continue in this mode, if it isnC"b,b"t contained, do nothing.
There may be an option to discard or to reproduce the splitting elements.
Examples for this technique are in https://subversion.le-tex.de/common/evolve-hub/evolve-hub.xsl, modes hub:split-at-tab and hub:split-at-br
They are a bit more complex than your case because they split paragraphs that may contain tables or footnotes that in turn can contain other paragraphs. I introduced the function hub:same-scope($splitting-element, $containing-element) to split only at splitting elements that are contained within the paragraph that should be split, rather than in a paragraph that is contained in a footnote or table cell that is somehow contained in the given paragraph.
I might prepare a synthetic standalone example if anyone is interested, and furthermore on the condition that interested parties root for Germany instead of France today.
On 04.07.2014 16:43, Geert Bormans geert@xxxxxxxxxxxxxxxxxxx wrote:Hi all,
Here is a fun one I thought I could share
I have a nicely nested XML (a bit TEI like) and markers for page breaks can happen everywhere in the document (as empty elements)
Now I want to break the document per page, reconstructing the structure So in a first step, I want to isolate the pagebreak to the highest level
<book> <title>...</title> <section> <para>aaa<pb/>bbb</para> </section> </book>
<book> <title>...</title> <section> <para>aaa</para> </section> <pb/> <section> <para>bbb</para> </section> </book>
Bearing in mind I need a generic solution and pagebreaks can happen at every level
Any thoughts? I am not looking for code, just curious on how people would attack this
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