[Zope] About factory_type_information

[D2]

Why is needed this factory_type_information in CMFDehault.portal.py

factory_type_information = ( Document.factory_type_information
                            + Image.factory_type_information
                            + File.factory_type_information
                            + Link.factory_type_information
                            + NewsItem.factory_type_information
                            + Favorite.factory_type_information
                            + DiscussionItem.factory_type_information
                            + SkinnedFolder.factory_type_information
                            )

as there is a specific factory_type_information in each type (document, 
file, etc) ?
-- 
Andre
PZP Enthusiast