[ZDP] BackTalk to Document The Zope Book (2.6 Edition)/Basic DTML

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A comment to the paragraph below was recently added via http://zope.org/Documentation/Books/ZopeBook/2_6Edition/DTML.stx#3-91

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      Suppose we're running a special. First time zoo visitors get in
      for half price. Here's a DTML fragment that tests for a cookie
      using the *hasVisitedZoo* variable and displays the price
      according to whether a user is new or a repeat visitor::

        <dtml-if hasVisitedZoo>
          <p>Zoo admission <dtml-var adult_rate fmt="dollars-and-cents">.</p>
        <dtml-else>
          <p>Zoo admission for first time visitors
               <dtml-var expr="adult_rate/2" fmt="dollars-and-cents"></p>
        </dtml-if>  

        % Anonymous User - Apr. 5, 2004 1:21 pm:
         A few paragraphs above, the value of fmt is written without quotation marks. Which one is preferred/right?