blog/Typesetting_a_short_story_using_docbook_for_PDF__HTML_and_EPUB.html

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   6     <title>Petter Reinholdtsen: Typesetting a short story using docbook for PDF, HTML and EPUB</title>
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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Typesetting a short story using docbook for PDF, HTML and EPUB</div>
  24       <div class="date">24th March 2013</div>
  25       <div class="body"><p>A few days ago, during a discussion in
  26 <a href="http://www.efn.no/">EFN</a> about interesting books to read
  27 about copyright and the data retention directive, a suggestion to read
  28 the 1968 short story Kodémus by
  29 <a href="http://web2.gyldendal.no/toraage/">Tore Åge Bringsværd</a>
  30 came up.  The text was only available in old paper books, and thus not
  31 easily available for current and future generations.  Some of the
  32 people participating in the discussion contacted the author, and
  33 reported back 2013-03-19 that the author was OK with releasing the
  34 short story using a <a href="http://www.creativecommons.org/">Creative
  35 Commons</a> license.  The text was quickly scanned and OCR-ed, and we
  36 were ready to start on the editing and typesetting.</p>
  37
  38 <p>As I already had some experience formatting text in my project to
  39 provide a Norwegian version of the Free Culture book by Lawrence
  40 Lessig, I chipped in and set up a
  41 <a href="http://www.docbook.org/">DocBook</a> processing framework to
  42 generate PDF, HTML and EPUB version of the short story.  The tools to
  43 transform DocBook to different formats are already in my Linux
  44 distribution of choice, <a href="http://www.debian.org/">Debian</a>, so
  45 all I had to do was to use the
  46 <a href="http://dblatex.sourceforge.net/">dblatex</a>,
  47 <a href="http://docbook.sourceforge.net/release/xsl/current/epub/README">dbtoepub</a>
  48 and <a href="https://fedorahosted.org/xmlto/">xmlto</a> tools to do the
  49 conversion.  After a few days, we decided to replace dblatex with
  50 xsltproc/fop (aka
  51 <a href="http://wiki.docbook.org/DocBookXslStylesheets">docbook-xsl</a>),
  52 to get the copyright information to show up in the PDF and to get a
  53 nicer &lt;variablelist&gt; typesetting, but that is just a minor
  54 technical detail.</p>
  55
  56 <p>There were a few challenges, of course.  We want to typeset the
  57 short story to look like the original, and that require fairly good
  58 control over the layout.  The original short story have three
  59 parts/scenes separated by a single horizontally centred star (*), and
  60 the paragraphs do not contain only flowing text, but dialogs and text
  61 that started on a new line in the middle of the paragraph.</p>
  62
  63 <p>I initially solved the first challenge by using a paragraph with a
  64 single star in it, ie &lt;para&gt;*&lt;/para&gt;, but it made sure a
  65 placeholder indicated where the scene shifted.  This did not look too
  66 good without the centring.  The next approach was to create a new
  67 preprocessor directive &lt;?newscene?&gt;, mapping to "&lt;hr/&gt;"
  68 for HTML and "&lt;fo:block text-align="center"&gt;&lt;fo:leader
  69 leader-pattern="rule" rule-thickness="0.5pt"/&gt;&lt;/fo:block&gt;"
  70 for FO/PDF output (did not try to implement this in dblatex, as we had
  71 switched at this time).  The HTML XSL file looked like this:</p>
  72
  73 <p><blockquote><pre>
  74 &lt;?xml version='1.0'?&gt;
  75 &lt;xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version='1.0'&gt;
  76   &lt;xsl:template match="processing-instruction('newscene')"&gt;
  77     &lt;hr/&gt;
  78   &lt;/xsl:template&gt;
  79 &lt;/xsl:stylesheet&gt;
  80 </pre></blockquote></p>
  81
  82 <p>And the FO/PDF XSL file looked like this:</p>
  83
  84 <p><blockquote><pre>
  85 &lt;?xml version='1.0'?&gt;
  86 &lt;xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version='1.0'&gt;
  87   &lt;xsl:template match="processing-instruction('newscene')"&gt;
  88     &lt;fo:block text-align="center"&gt;
  89       &lt;fo:leader leader-pattern="rule" rule-thickness="0.5pt"/&gt;
  90     &lt;/fo:block&gt;
  91   &lt;/xsl:template&gt;
  92 &lt;/xsl:stylesheet&gt;
  93 </pre></blockquote></p>
  94
  95 <p>Finally, I came across the &lt;bridgehead&gt; tag, which seem to be
  96 a good fit for the task at hand, and I replaced &lt;?newscene?&gt;
  97 with &lt;bridgehead&gt;*&lt;/bridgehead&gt;.  It isn't centred, but we
  98 can fix it with some XSL rule if the current visual layout isn't
  99 enough.</p>
 100
 101 <p>I did not find a good DocBook compliant way to solve the
 102 linebreak/paragraph challenge, so I ended up creating a new processor
 103 directive &lt;?linebreak?&gt;, mapping to &lt;br/&gt; in HTML, and
 104 &lt;fo:block/&gt; in FO/PDF.  I suspect there are better ways to do
 105 this, and welcome ideas and patches on github.  The HTML XSL file now
 106 look like this:</p>
 107
 108 <p><blockquote><pre>
 109 &lt;?xml version='1.0'?&gt;
 110 &lt;xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version='1.0'&gt;
 111   &lt;xsl:template match="processing-instruction('linebreak)"&gt;
 112     &lt;br/&gt;
 113   &lt;/xsl:template&gt;
 114 &lt;/xsl:stylesheet&gt;
 115 </pre></blockquote></p>
 116
 117 <p>And the FO/PDF XSL file looked like this:</p>
 118
 119 <p><blockquote><pre>
 120 &lt;?xml version='1.0'?&gt;
 121 &lt;xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version='1.0'
 122   xmlns:fo="http://www.w3.org/1999/XSL/Format"&gt;
 123   &lt;xsl:template match="processing-instruction('linebreak)"&gt;
 124     &lt;fo:block/&gt;
 125   &lt;/xsl:template&gt;
 126 &lt;/xsl:stylesheet&gt;
 127 </pre></blockquote></p>
 128
 129 <p>One unsolved challenge is our wish to expose different ISBN numbers
 130 per publication format, while keeping all of them in some conditional
 131 structure in the DocBook source.  No idea how to do this, so we ended
 132 up listing all the ISBN numbers next to their format in the colophon
 133 page.</p>
 134
 135 <p>If you want to check out the finished result, check out the
 136 <a href="https://github.com/sickel/kodemus">source repository at
 137 github</a>
 138 (<a href="https://github.com/EFN/kodemus">future/new/official
 139 repository</a>).  We expect it to be ready and announced in a few
 140 days.</p>
 141 </div>
 142
 143       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture</a>, <a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett</a>.</div>
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 459  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 460
 461  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (43)</a></li>
 462
 463  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 464
 465  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (4)</a></li>
 466
 467  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (48)</a></li>
 468
 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (3)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (10)</a></li>
 472
 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (35)</a></li>
 474
 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (2)</a></li>
 476
 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 478
 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (8)</a></li>
 480
 481  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (54)</a></li>
 482
 483  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 484
 485  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (37)</a></li>
 486
 487 </ul>
 488
 489
 490     </div>
 491     <p style="text-align: right">
 492  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 493 </p>
 494
 495   </body>
 496 </html>