[Zope-PAS] Re: proposal: IUserAdder plugins

[Miles]

Jens Vagelpohl wrote:
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> On 6 May 2007, at 05:12, Miles wrote:
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>>> -1, we can not change semantics of existing interfaces.
>>>
>>
>> I agree with this.  Though the restriction is not documented  anywhere: I
>> am happy to add some explanatory notes though.
> 
> It does not need to be documented because that is a generally  accepted 
> rune, not something specific to this project. Interfaces  should not 
> change out of the blue. If a change must be made there are  mechanisms 
> (deprecation warnings, etc) that can be used to tell  people about 
> impending changes, and they're usually employed for 2  releases.
> 

Sorry, my mail wasn't very clear.

I meant the "the first IUserAdder plugin to return True vetoes further 
plugins" restriction (which isn't documented - I was suggesting adding a 
note about it) and not the "changing semantics of interfaces out of the 
blue is not allowed" restriction (which is documented in mailing lists 
and other places).

Miles