es. Should be a set.<br>
  <br>
  <b>{DH 031003;fixed in iod and aod,&nbsp; declared as a set in grounding
not relevant for basic}</b><br>
</blockquote>
           
<hr width="100%" size="2">   
<h2>Other<b><br>
   </b></h2>
    <b>* comment the code, esp. rules and algorithms... - [SL 030724-4]</b><br>
   <br>
   <b>* describe undocumented features, including... - [SL 030724-5]</b><br>
     
<blockquote>- "up" action<br>
   - plan constructors:<br>
   * if_then_else<br>
   * bind<br>
   * protect<br>
   * 