I should be able to specify a Validation Filter for a Link Property

(User Story, Investigate , Priority: Medium, Test Status: No automated tests yet , Reported By Justin du Coeur, )
Data Model, QL, Editor
Summary: This would be a Function on a Link Property. When you edit a value of that Property, only values passing this filter would be offered.
This is motivated by the "Helpful Stories" Property on the Use Case Model in this Space. I really only want it to offer me open Stories, not closed ones. Validation Filter seems to be the abstraction of that notion, and seems generally useful -- if we add it, I suspect we'll wind up gradually broadening its usage. (Indeed, it could become extremely powerful and useful as a way for users to constrain the notion of a valid value.)