On Fri, Apr 23, 2010 at 5:58 PM, Tres Seaver <tsea...@palladion.com> wrote:
...
> I disagree, pretty strongly:  making code forever responsible for bad
> old data is responsible for a lot of horrors in both Zope2 and Zope3
> code bases.  Releasing the packages separately allows the folks who need
> time to fix the data to have it, while still allowing development to
> continue without the burden.
>
> If you are running with a 3.6.x version of zope.dublincore, and you have
> persisted the permissions somehow, then you need to *evolve the data*
> before upgrading to 3.7.0. That is why 3.7.0 got the bump from 3.6.x.

The bump to 3.7 would be due to a feature change. A backward-incompatible
change would require a bump to 4.

> If you can't afford (yet) to evolve the data, then don't upgrade the
> package until you can.  Running with 3.6.3 allows you to use either
> permission, as the zope.app.dublincore versions get upgraded in place to
> zope.dublincore equivalents.

No. The declarations you give in 3.6.3 cause the new names to be
mapped back to the old.

> Or are you saying that the way 3.6.3 uses meta:redefinePermission won't
> work for persisted permissions?

It will.  The redefinePermission change you propose for 3.7 won't,
which makes it
backward incompatible, which means it should be a 4.0 release.

Jim

-- 
Jim Fulton
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