There are a lot of chapters, but they fall all into one of the following categories.

• A large part of the manual is dedicated to the UI definition language. The section The UI language contains descriptions for every ui element such as ui:application, ui:variable, or ui:button. The small chapters about Processing instructions, and The standard UI library should be mentioned here, too.

• Another part describes the API of the WDialog library. The chapter WDialog API (O'Caml) goes through the whole interface of the library, and describes every type, class, and function. The manual currently covers only the O'Caml version of the library; the Perl bindings are only documented as perldoc in the individual Perl modules.

• There are some fundamental concepts that are important for both the UI definition and the application program. The chapters about Dialogs, Data types, Events, and Templates fall into this category.

• Finally, there are chapters about advanced techniques describing expert knowledge: Internationalization, Output encodings, Runtime models.