UML Class Diagram - User and User Type

Question

This is about User and User Type relationship.

I have two classes User and UserType User has UserID, UserName, UserTypeID UserType as : TypeID, TypeName

One user can have only one User Type (TypeID1/TypeID2/TypeID3)

What could be UML class diagram notation to represent this? is it association or composition or aggregation?

This diagram has Car and car type as Association http://www.jetbrains.com/idea/features/screenshots/80/uml2.png

This diagram has plugin and plugin type as composition http://indico-software.org/raw-attachment/wiki/Dev/Technical/PluginSystem/Plugin%20System%20class%20diagram.png

Answer 1

Something like this?

or like this

it dependents buddy, the first solution is useful when the user type does some functionality itself, in other word its a class(member), while the second solution is just useful when there is some constant about user types.

Answer 2

In order to know how to choose between association, composition or aggregation, you just have to answer at these two questions. 1) One is a part of the other? Yes => composition or aggregation, No => Association. 2) if you "delete" the container does the contain still exist? Yes => aggregation, No => Composition.

So as I understood your model you should model an association between User and UserType. Another solution would be to model an attribute on User with UserType as type.