[ZDP] BackTalk to Document The Zope Book (2.5 Edition)/Variables and Advanced DTML

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A comment to the paragraph below was recently added via http://www.zope.org/Documentation/Books/ZopeBook/current/AdvDTML.stx#3-167

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      There is an important side effect to raising an exception,
      exceptions cause the current transaction to be rolled back. This
      means any changes made by a web request to be ignored. So in
      addition to reporting errors, exceptions allow you to back out
      changes if a problem crops up.

        % Anonymous User - Sep. 24, 2002 5:50 pm:
         /to be/are/
         /back out/back out of/ # not sure