How to show that certain types are in a specific namespace? Accordingly to UML 2.
You can create the package and include those items in the package. Note that UML2 has the notion of package, that is also a namespace (and gets translated as such into programming languages).
I'd say that the package construct is close enough to the idea of namespace. Use that.
As far as I know, there is no specific "namespace" notation in UML.
Just use a package around any components that belong in a specific namespace (and use the namespace as the package name).
In UML we use package with <> stereotype for modeling namespace. See UML v.2.5. 7.4 Namespaces for details.
来源：https://stackoverflow.com/questions/4114192/how-to-show-namespace-in-uml