book</strong> only supports Markdown as original format. If you want to add support for other formats, you have to create a new parser (dig into the Markdown parser to know how to create it) and you also have to change the <code>parseContents()</code> method of the <em>publisher</em>.</p>

<p>After converting all contents to the desired format (usually HTML) they are decorated using Twig templates (<code>decorateContents()</code>). Finally, the <code>assembleBook()</code> method is responsible for creating 