[ZDP] BackTalk to Document The Zope Book (2.5 Edition)/Extending Zope

[nobody@nowhere.com]

A comment to the paragraph below was recently added via http://www.zope.org/Documentation/Books/ZopeBook/current/CustomZopeObjects.stx#2-42

---------------

    Now click *Add*.  This will take you back to the *ZooExhibit* Product
    and you will see five new objects, as shown in [12-4].

      % Anonymous User - Aug. 21, 2002 9:09 am:
       I would like to build a ZClass that inherits from class SessionDataManager of the Session product, but no
       such class shows in the base classes list. Are there any techniques to make it became a base class extensible
       by ZClasses?
       The strange thing is that further on an __init__.py example shows how to register a class so to make it
       available to ZClasses for inheriting, and the __init__.py file of the Session product follows such
       registration directives!
       To be honest, it calls context.registerClass(), not context.registerBaseClass().
       Maybe that's the point? Can I overcome this editing __init__.py and changing
       context.registerClass() to context.registerBaseClass()?