A comment to the paragraph below was recently added via http://zope.org/Documentation/Books/ZopeBook/2_6Edition/ZopeArchitecture.stx#3-25
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Zope objects are stored in a high-performance transactional
object database known as the Zope Object Database (ZODB). Each
Web request is treated as a separate transaction by the object
database. If an error occurs in your application during a
request, any changes made during the request will be
automatically rolled back. The object database also provides
multi-level undo, allowing a site manager to "undo" changes to
the site with the click of a button. The Zope framework makes
all of the details of persistence and transactions totally
transparent to the application developer. Relational databases
which are used with Zope can also play in Zope's transaction
framework.
% Anonymous User - Dec. 17, 2003 8:29 am:
testcbo
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