guage code of the variant
                        (see also <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Locale.html?is-external=true" title="class or interface in java.util"><code>Locale</code></a> class description);
                        may be <code>null</code> provided <code>language</code> and
                        <code>country</code> are <code>null</code> too.</dd>
<dd><code>encoding</code> - the content encoding of the variant - may be <code>null</code>.</dd>
<dt><span class="th