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At least looking at this closer made me realize I hadn’t constrained referential attributes to identifiers. (Doh!)
I do have the relationship between non-composition relationships and referential attributes as unconditional on both ends as ‘is formalized by’ M:1 ‘formalizes’, so the metamodel is formalizing all identifiers. I think this is correct. It should be the choice of the model editor to filter the referentials displayed for presentation to the user (via analyst direction).