Proposed Solution =================
1.) Adding ZCML that bridges existing z2 interfaces into the 'interfaces' module of their package. [Zope 2.8.0]
+1
2.) Copying z3 interfaces from Five.interfaces to the 'interfaces' module of the corresponding package. Marking those in Five as Zope 2.7 backwards compatibility cruft. [Zope 2.8.0]
+1
3.) Doing the same for Zope 2.7 with monkey patching code. [Five 1.0+]
I assume here you mean patching in OFS.interfaces, webdav.interfaces etc...
4.) Making interfaces.zcml point to the new locations. [Five 1.0+]
5.) Adding unit tests that verify interfaces and implementations. [Zope 2.8.0]
IMHO that's yagni. We actually don't use interfaces that much for verifying implementations anymore. I think their most common use in Zope 3/Five is documentation, API/schema specification, and easier spelling for security declarations.
Risks =====
I can't see a way to provide backwards compatibility for Products.Five.interfaces.*, but as explained above I'm hopeful this doesn't break many Five products.
How and where would we be backward incompatible? I assume that Five.interfaces would remain where it is, since its definitions are needed for your point 3) above.
Philipp
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