s and planned futures are often recorded only fitfully. Here
is a summary of attempts to organize and record relevant data in this
area.
</p>
  <h3>Outline</h3>
  <nav>
    <ul>
      <li>The <code><abbr>tz</abbr></code> database product and process
	<ul>
	  <li><a href="#tzdb">The <code><abbr>tz</abbr></code> database</a></li>
	  <li><a href="#download">Downloading the <code><abbr>tz</abbr></code> database</a></li>
	  <li><a href="#changes">Changes to the <code><abbr>tz</abbr></code> database</a></li>
	  <