Represent a dictionary within a dictionary

Question

I am creating UML diagrams that will represent C# code and I've reached somewhat of an impasse. I am currently representing a Dictionary<object, object> by using a qualified association, where the qualification is the key type and the class at the end of the association is the value type.

Now I would like to represent a type in UML, like so: Dictionary<int, Dictionary<object, object>. Is there any type of standard I can use to create a relationship that will accurately represent this relationship?

Answer 1

That line with angle brackets is merely a declaration that says what relations the class will have. You cannot show the declaration in the UML, except in a note (also useful it can be). But you can (and you should) show the relations themselves. Practically, the line Dictionary<int, Dictionary<object, object> can be taken as a strict declaration of a simple class diagram.