[ZDP] BackTalk to Document The Zope Book (2.5 Edition)/Advanced Page Templates

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A comment to the paragraph below was recently added via http://www.zope.org/Documentation/Books/ZopeBook/current/AdvZPT.stx#3-96

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      Note that in this example you can't use the expression,
      "not:request/form/number", since that expression will be true if
      the 'number' variable exists and is zero.

        % Anonymous User - Sep. 26, 2002 1:47 pm:
         /expression,/expression/