message <span class="message">ListPrefsArg</span>
{
  <span class="comment">/** 
   * Whether to sort the preferences alphabetically or not.
   */</span>
  optional <span class="bool">bool  </span> sort    = 1; 
  <span class="comment">/** 
   * List the keys in the specified section only. If not present,
   * all keys in all sections will be listed.
   */</span>
  optional <span class="string">string</span> section = 2; 
}
