ss="reference internal" href="preface.html">1. Preface</a><ul>
<li class="toctree-l2"><a class="reference internal" href="preface.html#about">1.1. About</a><ul>
<li class="toctree-l3"><a class="reference internal" href="preface.html#about-this-api">1.1.1. About this API</a></li>
<li class="toctree-l3"><a class="reference internal" href="preface.html#about-the-author">1.1.2. About the author</a></li>
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