[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#3-29

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      Just as the client object uses acquisition to look in a number
      of places for variables, so too the request looks up variables
      in a number of places. When the request looks for a variable it
      consults these sources in order:

        1. The CGI environment. The "Common Gateway
           Interface":http://www.w3.org/CGI/, or CGI interface defines
           a standard set of environment variables to be used by
           dynamic web scripts.  These variables are provided by Zope
           in the REQUEST namespace.

        2. Form data. If the current request is a form action, then
           any form input data that was submitted with the request can
           be found in the REQUEST object.

        3. Cookies. If the client of the current request has any cookies
           these can be found in the current REQUEST object.

        4. Additional variables. The REQUEST namespace provides you
           with lots of other useful information, such as the URL of
           the current object and all of its parents.

        % Anonymous User - Sep. 24, 2002 2:11 pm:
         - neither client object nor request object do the lookup, the DTML interpreter does.
         - the request object is *constructed* before the call to include the following sources
         - Form data: see http://www.zope.org/Members/Zen/howto/FormVariableTypes
           and http://www.dieter.handshake.de/pyprojects/zope/book/chap3.html