[Zope-CMF] Re: [dev] RFC: Extensible propertysheet use cases

[Michel Pelletier]

On Wed, 2004-09-29 at 13:40, yuppie wrote:
> Hi Michel!
> 

> Two reasons why I would prefer a new class:
> 
> - The functions currently exposed in FactoryTypeInformation are mature 
> and fool save compared to the proposed PropertySheets machinery. If you 
> don't know exactly what you do, it is very likely that modifying the 
> schema after creating instances of that type screws up your data.

The instance property sheets can define a custom getProperty that checks
against the type schema to see if it's changed.

> 
> - FactoryTypeInformation is also used by Archetypes and CPSDocument. 
> These have their own schema machinery that's not compatible with the 
> PropertySheets machinery.

That's a good reason for a new class, but by "not compatible" do you
mean just different?  Or do thay actually conflict on the same
attributes and break each other?

> TW: Against which CMF version is your patch? I tried it with HEAD, but 
> that didn't work.

Oops, this was developed against the customer site, 2.0.4.  I'll try and
get a head version out soon.

-Michel

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