Re: [xsl] Merging changes via ID

[Michael Ludwig <milu71@xxxxxx>]

Lech R. schrieb am 22.06.2009 um 18:13:24 (+0100):
> Or maybe I'm just tired.

Hi Lech,

in that case, more pivo is required !!!

> I want the new file to reflect the structure of the updated, English
> file and have the text content of the translated one. The XML files
> are derived from Docbook.

Okay, I guess the structure is the sequence of /*/*[@xml:id] - so
everything with an ID at level 2.

> So, to begin, I've created the following:
> 
>   <xsl:template match="*[@xml:id]">
>     <xsl:copy-of
> select="document('doc2.xml')//*[@xml:id=document('doc1.xml')//@xml:id]"/>
>   </xsl:template>

Note there is a nifty idiom: document('bla.xml#gurke') selects the
element node with ID "gurke" out of document "bla.xml".

Also, the id() function might come in handy.

> My worries:
> the recursion is from top to bottom, so what if there are changes
> below and the tempate matches the whole tree at the top?
> It matched on ID but what about the changes for inline elements below
> block level that don't have an ID? Would it make processing more
> simple were I to generate IDs for them or should I process and match
> them as descendant of a given ID of a block?
> Other worries such as removed, added element, I've already taken care
> of those.

I'm not sure I understand all of this. Take a look at the following,
maybe this is helpful, maybe not:

<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>

  <xsl:param name="doc2" select="'lech-xmlid.pl.xml'"/>

  <!-- elements with ID below document element -->
  <xsl:template match="/*/*[@xml:id]">
    <xsl:copy>
      <xsl:copy-of select="@*"/>
      <xsl:copy-of select="document( concat( $doc2, '#', @xml:id))"/>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="@*|node()">
    <xsl:copy>
      <xsl:apply-templates select="@*|node()"/>
    </xsl:copy>
  </xsl:template>

</xsl:stylesheet>

Note this leaves an unmatched <section xml:id="s02"/> in the output,
If you don't want that, it could be avoided quite easily.

<?xml version="1.0"?>
<article xmlns="http://docbook.org/ns/docbook"; version="5.0"
xml:id="SAMPLE_EN">
    <info xml:id="intro"><info xml:id="intro">                                                    
        <title>Wprowadzenie do Docbook</title>
    </info></info>
    <section xml:id="s01"><section xml:id="s01">
        <title>Formatowanie i Obrazki</title>
        <para>Oto przyklad ze &lt;oXygen/&gt; moze byc uzwany do
edycji dokumentow zgodnych z dockbookx.dtd.</para>
        <para>Aby obejrzec te instrukcje w przegladarce WWW, wybierz
nastepujacy scenariusz transformacji:
            <code>Docbook HTML</code>.
        </para>
    </section></section> 
    <section xml:id="s02"/>
    <section xml:id="s04"><section xml:id="s04"><title>Przyklad
zagniezdzania</title>
        <para>Aby zilustrowac problemy z zagniezdzaniem.</para>
    </section></section>                                   
</article>

Best,

Michael Ludwig