Federation-safe element identity: a model-qualified key. Element identity is
(model, key) everywhere in the engine, so exclusions must be namespaced by
model too — otherwise two models that both contain element "42" collide and
can hide valid cross-model clashes.
Federation-safe element identity: a model-qualified key. Element identity is
(model, key)everywhere in the engine, so exclusions must be namespaced by model too — otherwise two models that both contain element "42" collide and can hide valid cross-model clashes.