[Zope-CMF] How to attach own properties to existing portal types (like metadata does)?

[Florent Guillaume]

Grégoire Weber  <gregoire.weber@switzerland.org> wrote:
> I'd like to attach additional properties to existing portal types. 
> These properties describe (store information) about additional 
> functionality independantly of the content type.
> 
> Existing and future portal types need not to know about this 
> functionality. 
> 
> The functionality has nothing to do with the metadata 
> functionality. That's why I don't want to integrate the properties 
> into it. I'd like to implement a new tool handling this 
> functionality.
> 
> Does someone have any pointers where to look, where to find 
> examples, which interface to implement to attach such properties, 
> etc.?

The WorkflowTool does that. It stores all its info on the object with
the object's knowledge, in an attribute called 'workflow_history'.

There's no general framework to do that in CMF though, although the in
Zope 3 as you mentionned there is.

Florent


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Florent Guillaume, Nuxeo (Paris, France)
+33 1 40 33 79 87  http://nuxeo.com  mailto:fg@nuxeo.com