ided <code>language</code> is <code>null</code> too.</dd>
<dd><code>encoding</code> - the content encoding of the variant - may be <code>null</code>.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if all the parameters are <code>null</code>.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0<