Hi, Christian Theune wrote: > Issue 735 (http://www.zope.org/Collectors/Zope3-dev/735) describes a > problem how IAnnotations are used within Zope. > > I agree that this should be changed. I'd like to get some discussion on > the mailinglist on how to change this (I've added a short analysis in > the transcript of the issue).
I wanted to catch up on this. Thanks for the input! I've considered the options everybody gave me and have also been trying to find some pointers to how other people handle the evolution of interfaces and found an interesting read from the "java guys": http://wiki.eclipse.org/index.php/Evolving_Java-based_APIs I've considered the options written in there, which is basically that adding new required methods to an API class causes breakage. However, in the end, I found this section: http://wiki.eclipse.org/index.php/Evolving_Java-based_APIs#Defective_API_Specifications I've stepped back again and looked at the interface and thought about rewriting the code places specified in issue 735 and saw that there is no way to it. I hereby propose to consider zope.annotation.interfaces.IAnnotations underspecified and therefore defective. It is intended to be used dictionary-like, and some clients already expected it to be a dictionary. However, we do not offer any access to the typical methods that allow clients to get a list of keys or values. If the IAnnotations API is decided to be underspecified and therefore defective I argue that we can justify breakage and add the required methods to IAnnotations. However, in this case we should notify new users, maybe with an easy-to-find hint in the CHANGES.txt and maybe the release messages. Christian -- gocept gmbh & co. kg - forsterstraße 29 - 06112 halle/saale - germany www.gocept.com - [EMAIL PROTECTED] - phone +49 345 122 9889 7 - fax +49 345 122 9889 1 - zope and plone consulting and development
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