[Zope-dev] ZClass inheriting from Python Class

Hi everybody, I've been toying with ZClasses. I made a simple Python class and registered it with Zope as mentioned in the ZClass tutorial. Then I made a ZClass that inherits from this Python class. I store some text data in a list in the ZClass. This works fine, except when I restart Zope; the data in the list is gone. Apparently the mixin Python class is not automatically persistent. Is this what should happen? What do I do about it? Regards, Martijn