[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#3-53

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      At this point there's quite a bit of testing and refinement that
      you can do. Your main annoyance will be having to restart Zope
      each time you make a change to your product class (but see
      Chapter 7 for information on how to avoid all this
      restarting). If you vastly change your class you may break
      existing poll instances, and will need to delete them and create
      new ones. See Chapter 7 for more information on debugging
      techniques which will come in handy.

        % Anonymous User - Nov. 8, 2002 8:15 pm:
         ... if you vastly change: more specific: if you change the class signature
         by adding/renaming/deleting class members (attribute or method) 
         or any of the class methods parameter lists
         product instances of previous trials will break.