>"null"</code> if
 the key is <code>null</code>.</li>
 <li>name - Same as displayName property.</li>
 <li>shortDescription - Empty string</li>
 <li>expert - <code>false</code></li>
 <li>hidden - <code>false</code></li>
 <li>preferred - <code>true</code></li>
 </ul>

 In addition, the following named attributes must be set in the returned <code>FeatureDescriptor</code>s:
 <ul>
 <li><a href="../../javax/el/ELResolver.html#TYPE"><code>ELResolver.TYPE</code></a> - The return value of calling the <code>getClass(