   <li>A variant name, usually empty but can be any string.</li>

                <li>An ISO 15924 alpha-4 script code, like <i>Latn</i> (Latin)</li>

                <li>A set of extensions represented by single characters, like <i>u</i>.</li>
            </ul>

            <p>But most of the time, we just work with languages and countries.</p>
            <hr />

            <h4><i>A Locale representation</i></h4>

            <p><i>The language part is required</i></p>

            <p><i>The country part