       <li><a href="working_practices.html#rapid">Rapid vs Staged Development
        Practises</a></li>
      </ul>
    </li>

    <li>
      <a href="extract.html">The Extract System</a>

      <ul>
        <li><a href="extract.html#command">The Extract Command</a></li>

        <li>
          <a href="extract.html#simple">Simple Usage</a>

          <ul>
            <li><a href="extract.html#simple_local">Extract from a local
            path</a></li>

            <li><a href="extract.html#simple_url">Ex