[Zope3-dev] Re: zope.annotation dependency to zope.app.container.contained

Christian Zagrodnick cz at gocept.com
Wed Aug 15 07:43:53 EDT 2007

On 2007-08-09 20:51:26 +0200, Philipp von Weitershausen 
<philipp at weitershausen.de> said:

> Roman Joost wrote:
>> we're doing some dependency checking at gocept and I discovered that
>> zope.annotation depends on zope.app.container in its factory.
>> What shall we do with this dependency to zope.app.container? Moving this
>> factory to zope.app is probably not the best solution.
> To be clear, zope.annotation doesn't depend on zope.app, it depends on 
> zope.app.container which is its own package and egg (and in fact, 
> zope.annotation's dependencies are refreshingly few). The real problem 
> is that zope.app.container depends on a whole bunch of other things. 
> The question is why.

Okay, actually I think that zope.annotation uses IContained. This is 
just wrong but also results in an underspecification of IContained:

class IContained(ILocation):
    """Objects contained in containers."""

When you read it very carefully you figure that it actually says is 
that object.__parent__[object.__name__] would result in the object 

IContained states how you can get the object from the __parent__. 
ILocation doesn't do that.

For the annotation factory using zope.location and ILocatable would be 
sufficient. So we could get rid of the zope.app.container dependency.

We should be a bit more specific about the IContained interface. Does 
it make any sense to have an IContained object without __name__. I 
think not. Chaning that would make __name__ a required attribute on 


Christian Zagrodnick

gocept gmbh & co. kg  ·  forsterstrasse 29 · 06112 halle/saale
www.gocept.com · fon. +49 345 12298894 · fax. +49 345 12298891

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