Validation and Events

Hi,

Is it possible yet to hook in a validator to an Archetypes object using
Five/Zope3 events?

Related to Martin Aspeli's work on schema-by-interface -- it's clear how that
could be used to add in a validator just for one new field, but not how we could
validate that the data from two fields satisfy some condition (e.g., min < max).

Peace,
George


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