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Practical Plone 3: A Beginner's Guide to Building Powerful Websites by Clayton Parker, Alex Clark

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Zope 3 basics

How do you tell the difference between Zope 2 and Zope 3 code? And what is Zope 3 anyway?

Plone 3 sits on top of a combination of Zope 2 and Zope 3 architectures. It is not a pure Zope 3 implementation, in spite of the ongoing perception that it is. You might recognize the name Five, which is a product that helped bridge the gap from Zope 2 and Zope 3 (2+3=5). Five is now baked into Plone and is the basis of the Plone 3 architecture, but you will still hear it referred to as Zope 3 most of the time. Pure Zope 3 doesn't have acquisition, but Five does, and Plone still relies on it.

Plone's Zope 3 implementation differs from Zope 2 in a number of ways. Plone 3 introduces the concept of a Component Architecture that encourages the reusability ...

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