Jean-Marc Orliaguet wrote:
...
the idea is that you define as many categories as you need: IMetaType,
ISomeCategory, IWidgetType ... and you create relations between
interfaces with:
directlyProvides(IFile, IContentType)
Exactly.
as if you had a relation tool,
There are all sorts of ways of expressing relationships in Python
without central databases.
> then every object that implements IFile
(no matter in what position) will have the IFile content type?
Right. Note that a content type is a specific kind of type.
If an object provides interface I, then the object is said to
be of type I. If I is a content type, then the object is said
to have that content type.
As a matter of policy, we expect an object to have a single content
type and have a helper function for getting "the content type" by
finding an object's most specifiuc type that is a content type.
But where do you put the 'directlyProvides' statement?
There are two options. You put it in some python module, such
as the module that defines IFile:
class IFile(...):
...
directlyProvides(IFile, IContentType)
or, since this is often a configuration choice, you put in in
zcml:
<interface
interface=".interfaces.IFile"
type="zope.app.content.interfaces.IContentType"
/>
Jim
--
Jim Fulton mailto:[EMAIL PROTECTED] Python Powered!
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