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pdf-transformation-history.html

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  1. <!DOCTYPE html
    2. 

  2.   SYSTEM "about:legacy-compat">
    3. 

  3. <html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="UTF-8"><meta name="copyright" content="(C) Copyright 2019"><meta name="DC.rights.owner" content="(C) Copyright 2019"><meta name="DC.type" content="concept"><meta name="description" content="The DITA Open Toolkit PDF transformation was originally based on a third-party contribution by Idiom Technologies, and is commonly known as the “pdf2” plug-in."><meta name="DC.subject" content=", info, legacypdf, PDF2, PDF, plug-in, history of, languages, auto-generated strings, HTML formatting differences, Idiom Technologies, HTML, PDF formatting differences, DITA 1.1, index, indexing domain, Customization directory, org.dita.pdf2"><meta name="keywords" content=", info, legacypdf, PDF2, PDF, plug-in, history of, languages, auto-generated strings, HTML formatting differences, Idiom Technologies, HTML, PDF formatting differences, DITA 1.1, index, indexing domain, Customization directory, org.dita.pdf2"><meta name="DC.relation" scheme="URI" content="../reference/pdf-transform.html"><meta name="DC.format" content="HTML5"><meta name="DC.identifier" content="history-pdf-transformation"><link rel="stylesheet" type="text/css" href="../css/commonltr.css"><link rel="stylesheet" type="text/css" href="../css/dita-ot-doc.css"><title>History of the PDF transformation</title></head><body id="history-pdf-transformation"><header role="banner"><div class="header">
    4. 

  4.   <p>DITA Open Toolkit</p>
    5. 

  5.   <hr>
    6. 

  6. </div></header><nav role="toc"><ul><li><a href="../index.html">DITA Open Toolkit 3.3</a></li><li><a href="../release-notes/index.html">Release Notes</a></li><li><a href="../topics/installing-client.html">Installing DITA-OT</a></li><li><a href="../topics/alternative-input-formats.html">Authoring formats</a></li><li><a href="../topics/building-output.html">Building output</a></li><li><a href="../parameters/index.html">Setting parameters</a></li><li><a href="../topics/customizing.html">Customizing DITA-OT</a></li><li><a href="../topics/troubleshooting-overview.html">Troubleshooting</a></li><li><a href="../reference/index.html">Reference</a><ul><li><a href="../reference/architecture.html">DITA-OT architecture</a><ul><li><a href="../reference/processing-structure.html">Processing structure</a></li><li><a href="../reference/map-first-preprocessing.html">Map-first preprocessing</a></li><li><a href="../reference/processing-pipeline-modules.html">Processing modules</a></li><li><a href="../reference/processing-order.html">Processing order</a></li><li><a href="../reference/preprocessing.html">Pre-processing modules</a></li><li><a href="../reference/XhtmlWithNavigation.html">HTML-based processing modules</a></li><li><a href="../reference/pdf-transform.html">PDF processing modules</a><ul><li class="active"><a href="../reference/pdf-transformation-history.html">History of the PDF transformation</a></li></ul></li></ul></li><li><a href="../reference/DITA_spec-support.html">DITA specification support</a></li><li><a href="../reference/license.html">License</a></li></ul></li><li><a href="../topics/dita-and-dita-ot-resources.html">Resources</a></li></ul></nav><main role="main"><article role="article" aria-labelledby="ariaid-title1">
    7. 

  7.   <h1 class="title topictitle1" id="ariaid-title1">History of the PDF transformation</h1>
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  8.   
    9. 

  9.   
    10. 

  10.   <div class="body conbody"><p class="shortdesc">The DITA Open Toolkit PDF transformation was originally based on a third-party contribution by Idiom
    11. 

  11.     Technologies, and is commonly known as the “pdf2” plug-in.</p>
    12. 

  12.     <p class="p">When IBM developed the code that later became DITA-OT, it included only a proof-of-concept PDF
    13. 

  13.       transformation. IBM had their own processing chain for producing PDFs from SGML, which they had developed over
    14. 

  14.       several decades, so resources were focused primarily on XHTML output and preprocessing.</p>
    15. 

  15.     <p class="p">Since the initial proof-of-concept transformation was not robust enough for production-grade output, companies
    16. 

  16.       began to develop their own PDF transformations. One company, Idiom Technologies, made their transformation (known
    17. 

  17.       as the “pdf2” transformation) available as open source on 23 February 2006. The Idiom plug-in was initially
    18. 

  18.       available as a separately-downloadable plug-in that could be installed into DITA-OT.</p>
    19. 

  19.     <p class="p">Later the DITA-OT project formally incorporated the Idiom plug-in as a demonstration in the
    20. 

  20.         <span class="ph filepath">demo/fo</span> directory. Beginning with DITA-OT version 1.5, released 18 December 2009, the
    21. 

  21.       “pdf2” code served as the main, supported PDF transformation. (The original PDF transformation was deprecated and
    22. 

  22.       renamed “legacypdf”.) In DITA-OT version 1.6, the “pdf2” plug-in was moved to
    23. 

  23.         <span class="ph filepath">plugins/org.dita.pdf2</span>. </p>
    24. 

  24.     <p class="p">The fact that the current PDF transformation was not originally developed in parallel with the other core DITA-OT
    25. 

  25.       transformations led to anomalies that often confuse users:</p>
    26. 

  26.     <ul class="ul">
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  27.       <li class="li">Elements are often (by default) styled differently in the XHTML and PDF transformations. For example, consider
    28. 

  28.         the <code class="keyword markupname xmlelement">&lt;info&gt;</code> element in a task topic. In HTML output, this is an inline element; in PDF
    29. 

  29.         output, it is a block-level element.</li>
    30. 

  30.       <li class="li">The auto-generated strings used for localization are different, and so languages that are supported by DITA-OT
    31. 

  31.         differ based on whether the XHTML or PDF transformation is used.</li>
    32. 

  32.       <li class="li">The Idiom plug-in used its own extension mechanism (the <span class="ph filepath">Customization</span> folder) to provide
    33. 

  33.         overrides to the PDF transformation.</li>
    34. 

  34.       <li class="li">Before the release of DITA 1.1 (which added support for the indexing domain), Idiom developed an index
    35. 

  35.         extension that used a FrameMaker-inspired syntax.</li>
    36. 

  36.     </ul>
    37. 

  37.   </div>
    38. 

  38. <nav role="navigation" class="related-links"><div class="familylinks"><div class="parentlink"><strong>Parent topic:</strong> <a class="link" href="../reference/pdf-transform.html" title="The PDF (formerly known as PDF2) transformation process runs the pre-processing routine and follows it by a series of additional targets. These steps work together to create a merged set of content, convert the merged content to XSL-FO, and then format the XSL-FO file to PDF.">PDF processing modules</a></div></div></nav></article></main></body></html>
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