[ZDP] BackTalk to Document The Zope Book (2.6 Edition)/Appendix C: Zope Page Templates Reference

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A comment to the paragraph below was recently added via http://zope.org/Documentation/Books/ZopeBook/2_6Edition/AppendixC.stx#3-16

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      Expressions used in statements may return values of any type,
      although most statements will only accept strings, or will convert
      values into a string representation.  The expression language must
      define a value named *nothing* that is not a string.  In
      particular, this value is useful for deleting elements or
      attributes.

        % Anonymous User - May 10, 2004 10:18 pm:
         deleting elements or attributes? when and where? this value refered to is nothing?