Calligra libs is a collection of libraries for very different functionality with the common denominator that some Calligra applications depend on it. Each of the libraries have a Mainpage.dox file which is used for API docs and it should contain an overview of the library goal and scope. If you add a class you should likely read this before deciding where it goes.
Various details can also be found here; community.kde.org/Calligra/Libs">http://community.kde.org/Calligra/Libs

SEE ALSO: README

Generated classes in the writeodf namespace.
The program rng2cpp compiles a given Relax NG (.rng) file into C++ headers. In Calligra, this is used in combination with the RNG for OpenDocument Format.
The generated code has an API with class names that resemble the names of the ODF tags. <text:h/> becomes writeodf::text_h, <office:automatic-styles> becomes writeodf::office_automatic_styles.
The generated code has advantages of directly using KoXMLWriter. - function names instead of strings gives autocompletion and catches typing errors at compile time. - since elements are added into other elements, the nesting is checked at compile time. - elements are automatically closed when they go out of scope (but end() can be called to close them sooner) - elements are automatically closed if another item (text or element or other) is added to its parent
Future improvements: - also generate code for reading elements - also generate code from OOXML Relax NG files - check data types (bool, int, string) at compile time