Everything in Zope is an object. Zope has two types of objects: simple items and folderish. Folderish objects are objects that can contain other objects, simple items do not. Many Zope products are folderish. Objects like MailHost, Versions and DTML Methods contain only their own information and actions and are considered Simple Items. User Folders are a special type of folder that can only contain User objects, and User objects can only exist inside of User Folders.
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