[Zope3-dev] calling objects when evaluating path expressions

[Phillip J. Eby]

At 05:06 PM 6/20/03 +0300, Steve Alexander wrote:
>One of the goals of page templates in Zope 3 is to allow them to present 
>content classes that were not written with such use in mind. So, in Zope 3 
>we cannot assume that properties are always provided where appropriate.

Note, by the way, that the idea of "implements no interfaces" is both bogus 
and fragile.  Bogus, in that every object implements *some* interface, it 
just may not be declared.  And fragile, in that it's susceptible to being 
changed by changes to a base class, or by external declaration via 
ZCML.  So some poor user's pages could break when a base class changes, 
perhaps because product A was upgraded and product B inherited from 
it.  Then a bunch of pages break for no apparent reason...  and the user 
thinks, "this Zope thing is mysterious and unstable."  Better to force the 
fixing of the breakage up front.