e initial
        value may be set in the <a class="link" href="structure.html#quickbook.ref.docinfo">Document</a>
        section.
      </p>
<p>
        To change the source mode, use the <code class="literal">[source-mode]</code> markup,
        where <code class="literal">source-mode</code> is one of the supported modes. For example,
        this:
      </p>
<pre class="programlisting">Python's [python] `import` is rather like C++'s [c++] `#include`. A
C++ comment `// looks like this` whereas a Python c