UAF13 — Consistency - Overlapping Concerns

The statement - 'Due to the complexity of managing the multiple viewpoints with overlapping concerns and metamodels' ... needs to be clarified. Concerns never overlap - viewpoints may share concerns. I think what is being described is that donor AFs may have shared concerns - if so the sentence needs to be qualified because within a UAF you woudn't expect shared concerns because it is then poor viewpoint design and leads to inconsistency if the user can't easily select the same viewpoint to use (too much overlap).

It's all the more confusing because Fig-8:2 Architecture Views states that a zero or more Concerns are (framed?) by a single Viewpoint so it's not even possible for viewpoints to share a concern.