The toolkit is combined from two basic set of classes - core and external.
The core classes are coded in C and form a base line for every Prima object
written in perl. The usage of C is possible together with the toolkit;
however, its full power is revealed in the perl domain. The external
classes present easily expandable set of widgets, written completely in
perl and communicating with the system using Prima library calls.

The core classes form an hierarchy, which is displayed below:

Prima::Object
Prima::Component
Prima::AbstractMenu
Prima::AccelTable
Prima::Menu
Prima::Popup
Prima::Clipboard
Prima::Drawable
Prima::DeviceBitmap
Prima::Printer
Prima::Image
Prima::Icon
Prima::File
Prima::Timer
Prima::Widget
Prima::Application
Prima::Window