What is the best way to visualize a “resolution matrix” in a UML class diagram?

Question

For simplicity:

There is a permission-based system with various types of user levels and actions (think: UNIX file system permissions)

What is the best approach to visualize this in UML?

Answer 1

I usually have classes representing users, roles, and permissions. Users belong to Roles and Roles, which are allowed permissions. Permissions are required to access other objects. In UML, I assume that you will model the role as an abstract base class and have several different implementations, one for each role.

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Answer 2

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