Is your feature request related to a problem? Please describe.

Many programming languages allow you to create nested classes, however the notation for class diagram doesn't support class names such as "MySingleton.Holder".

Describe the solution you'd like

Make '.' an allowed character in class names

Describe alternatives you've considered

Right now I am using the '$' symbol instead of the '.' as it is rarely or never used in actual class names but is still valid.