titlepage"><div><div><h3 class="title">
<a name="quickbook.syntax.phrase.source_mode"></a><a name="quickbook.ref.source_mode"></a><a class="link" href="phrase.html#quickbook.syntax.phrase.source_mode" title="Source Mode">Source
      Mode</a>
</h3></div></div></div>
<p>
        If a document contains more than one type of source code then the source
        mode may be changed dynamically as the document is processed. All QuickBook
        documents are initially in C++ mode by default, though an alternativ