[Zope] prefix attribute in dtml-in

[Sam Boggess]

Using Zope 2.8, I have two nested <dtml-in> tags that each loop  
through the results of different SQL methods.  I'm trying to use the  
prefix attribute to differentiate the two, but I can't get it to  
work.  Does anyone have any thoughts?

<dtml-in expr="getConsulting()" prefix="topic">
   <fieldset>
   <legend><dtml-var expr="sequence_var_fulltitle"> Sub Topics</legend>
     <dtml-in expr="getConsultingSub()" prefix="subtopic">
	<fieldset>
         <legend>Topic <dtml-var subtopic_displayorder>: <dtml-var  
subtopic_menutitle></legend>
	</fieldset>
   </dtml-in>
   </fieldset>
</dtml-in>