Re: [Zope] Using a ZCLass property as TALES expression ?

Gilles Lenfant writes:

I'm actually building a ZClass for which some validation rules may be customized object per object. I think that using a TALES expression for that purpose may be a good idea, but I can't find a way to execute a TALES expression in the context of the current object, and get the result. I do not know of a "TTW" (Through The Web) way to evaluate a TALES expression (given as a string) in a given context.

Of course, you can do it in an External Method. You will find several examples in the CMF (e.g. "ActionProviderBase", "DCWorkflow"). Dieter