How to highlight a class attribute?

[Mauricio Moya (Arquesoft)]

In a particular diagram, I want to emphasize that a specific class has a newly added attribute. This is only relevant within the context of that diagram and doesn’t need to be a property of the attribute itself, since in future diagrams the same class might be reused, and by then that attribute will no longer be new. At that point, I’ll need to highlight other attributes that are newly added.

In other words, in some diagrams I want to highlight certain attributes, and in others, different ones.

Does anyone have an idea how I could implement this?

[Elpis]

Maybe not a delightful idea, but available out of the box in EA:
Place a small Artifact element (some other element types may be suitable as well) on the diagram, near the Class, name it "See new attributes" and add Trace relationships (as few as necessary) to the Class, each with "Link to Element Feature" set to particular 'new' attribute.
'New' attributes will be marked visually by Traces, but only on diagrams where the artifact element will be placed as well.