[ZDP] BackTalk to Document Zope Developer's Guide (2.4 edition)/Zope Products

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A comment to the paragraph below was recently added via http://www.zope.org/Documentation/Books/ZDG/current/Products.stx#4-40

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        A 'w' present in the mode string indicates that the value of the
        property may be changed by the user. A 'd' indicates that the user
        can delete the property. An empty mode string indicates that the
        property and its value may be shown in property listings, but that
        it is read-only and may not be deleted.

          % Anonymous User - Nov. 3, 2002 6:12 pm:
           Example:

           _properties=({'id' : 'favorite_color', 
                         'type' : 'selection',
                         'select_variable' : 'getColors'

                        },
                       )

          % Anonymous User - Nov. 3, 2002 6:18 pm:
           # Example of mode:

           _properties=(
                         {'id':'title', 'type':'string', 'mode':'w'},
                         {'id' : 'favorite_color', 
                          'type' : 'selection', 
                          'select_variable' : 'getColors'
                          'mode':'wd'},
                       )

           # In this case, we don't want the user to delete the property
           # of 'title'. They can change it, but not remove it altogether.