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Most of this functionality is possible through the Event System, AppData, the Custom URL JavaScript, and XSD constraints (as well as GUI extensions). However, not everything is exposed through the Schema form view and there isn't an explicit approach to re-using and managing such messages and logic.
We'll leave this open under community review to see how the community reacts to the idea. We'd also be interested in seeing how editors reacted to existing extensions or follow-up implementation based on these or other examples:
