Convert Textile to DocBook

Why Convert Textile to DocBook?

Converting Textile markup to DocBook XML transforms your content into the industry-standard format for technical documentation and publishing. DocBook provides a rich semantic vocabulary that enables professional multi-format output including PDF, HTML, EPUB, man pages, and other formats from a single XML source.

DocBook has been the backbone of technical publishing since the early 1990s. Major projects like the Linux Documentation Project, FreeBSD documentation, and numerous O'Reilly books use DocBook for their documentation. The format's semantic markup ensures that document structure is preserved regardless of the output format.

The conversion maps Textile's lightweight notation to DocBook's semantic XML elements. Textile headings become DocBook sections with titles, paragraphs become para elements, lists become itemizedlist or orderedlist elements, and tables become CALS-model table structures. Code blocks are converted to programlisting elements with optional language attributes.

DocBook's strict XML schema ensures document validity, which is critical for automated publishing pipelines. The DocBook XSL stylesheets, maintained by Norman Walsh and the DocBook community, provide professional-quality transformations to HTML, PDF (via FOP or dblatex), EPUB, and other output formats with extensive customization options.

Key Benefits of Converting Textile to DocBook:

• Industry Standard: DocBook is the established standard for technical documentation
• Multi-Format Output: Generate PDF, HTML, EPUB, man pages from one source
• Semantic Markup: Rich vocabulary for technical content (admonitions, procedures, code)
• Schema Validation: Ensure document correctness with RELAX NG validation
• Publishing Quality: Professional output with DocBook XSL stylesheets
• Mature Ecosystem: Decades of tooling, stylesheets, and community support
• Scalable: Handles everything from single articles to multi-volume book sets

Practical Examples

Example 1: Article Structure

Input Textile file (guide.textile):

h1. Installation Guide

h2. Prerequisites

Before installing, ensure you have:

* Operating system: Linux, macOS, or Windows
* Python 3.8 or later
* 2 GB free disk space

h2. Installation Steps

# Download the package
# Extract the archive
# Run the installer

Output DocBook XML (guide.xml):

<?xml version="1.0" encoding="UTF-8"?>
<article xmlns="http://docbook.org/ns/docbook" version="5.0">
  <title>Installation Guide</title>
  <section>
    <title>Prerequisites</title>
    <para>Before installing, ensure you have:</para>
    <itemizedlist>
      <listitem><para>Operating system: Linux, macOS, or Windows</para></listitem>
      <listitem><para>Python 3.8 or later</para></listitem>
      <listitem><para>2 GB free disk space</para></listitem>
    </itemizedlist>
  </section>
  <section>
    <title>Installation Steps</title>
    <orderedlist>
      <listitem><para>Download the package</para></listitem>
      <listitem><para>Extract the archive</para></listitem>
      <listitem><para>Run the installer</para></listitem>
    </orderedlist>
  </section>
</article>

Example 2: Code and Tables

Input Textile file (api.textile):

h2. API Configuration

Set your API key:

bc. export API_KEY="your-key-here"
curl -H "Authorization: Bearer $API_KEY" \
  https://api.example.com/status

|_. Parameter |_. Type |_. Required |
| api_key | string | Yes |
| format | string | No |

Output DocBook XML (api.xml):

<section>
  <title>API Configuration</title>
  <para>Set your API key:</para>
  <programlisting language="bash">
export API_KEY="your-key-here"
curl -H "Authorization: Bearer $API_KEY" \
  https://api.example.com/status
  </programlisting>
  <table>
    <thead>
      <tr><th>Parameter</th><th>Type</th><th>Required</th></tr>
    </thead>
    <tbody>
      <tr><td>api_key</td><td>string</td><td>Yes</td></tr>
      <tr><td>format</td><td>string</td><td>No</td></tr>
    </tbody>
  </table>
</section>

Example 3: Blockquotes and Emphasis

Input Textile file (notes.textile):

h2. Important Notes

bq. Always backup your data before upgrading.

p(warning). This operation *cannot* be undone.

Read the _complete documentation_ before proceeding.

Output DocBook XML (notes.xml):

<section>
  <title>Important Notes</title>
  <blockquote>
    <para>Always backup your data before upgrading.</para>
  </blockquote>
  <warning>
    <para>This operation <emphasis role="bold">cannot</emphasis>
    be undone.</para>
  </warning>
  <para>Read the <emphasis>complete documentation</emphasis>
  before proceeding.</para>
</section>

Frequently Asked Questions (FAQ)

Q: What is DocBook?

A: DocBook is a semantic XML-based markup language maintained by OASIS for writing structured documentation. Originally developed in 1991 by HaL Computer Systems and O'Reilly Media, it provides a comprehensive vocabulary of over 400 elements for technical content including books, articles, reference documentation, and manuals. DocBook content can be transformed into HTML, PDF, EPUB, and other formats.

Q: Why is DocBook used for technical documentation?

A: DocBook separates content from presentation, enabling single-source publishing to multiple formats. Its semantic markup captures the meaning of content (e.g., "this is a warning" rather than "make this text red"), allowing different output formats to present the same content appropriately. This makes DocBook ideal for large documentation projects requiring consistent multi-format output.

Q: How complex is the Textile-to-DocBook conversion?

A: The conversion maps Textile's simple elements to DocBook's semantic equivalents. Headings become section titles, paragraphs become para elements, lists become itemizedlist/orderedlist, and tables use DocBook's table model. While DocBook has far more elements than Textile needs, the conversion produces valid, well-structured DocBook XML.

Q: Can I generate PDF from the DocBook output?

A: Yes! Use tools like Apache FOP, dblatex, or the DocBook XSL-FO stylesheets to produce professional PDFs from DocBook XML. These tools support customizable page layouts, fonts, headers, footers, table of contents, and other typographic features for print-quality output.

Q: What tools do I need to work with DocBook files?

A: You need an XSLT processor (xsltproc, Saxon) and the DocBook XSL stylesheets for transformations. For PDF, add Apache FOP or dblatex. XML editors like oXygen XML Editor or VS Code with XML extensions help with authoring. Pandoc can also read and write DocBook, providing a simpler alternative toolchain.

Q: Is DocBook still relevant today?

A: Yes, DocBook remains the gold standard for technical documentation. It is used by the Linux kernel documentation, FreeBSD project, many O'Reilly books, and enterprise documentation systems. While alternatives like AsciiDoc and Markdown have gained popularity for simpler needs, DocBook's comprehensive semantic vocabulary is unmatched for complex technical content.

Q: What is the difference between DocBook 4 and DocBook 5?

A: DocBook 5 uses XML namespaces (xmlns="http://docbook.org/ns/docbook"), RELAX NG schema instead of DTD, and simplified element names. DocBook 4 is the older DTD-based version. Our converter produces DocBook 5 output by default, which is the current standard recommended by OASIS.

Q: Can I validate the converted DocBook output?

A: Yes! DocBook 5 uses a RELAX NG schema that can be validated with tools like jing, xmllint, or any XML editor. Validation ensures the document structure is correct and all elements are properly nested. This is one of DocBook's key advantages over lightweight markup formats that lack formal schema validation.