This document contains both the libmwaw API specification and the normal libmwaw documentation.
The external libmwaw API is provided by libmwaw.hxx and the MWAWDocument class. This class, combined with the libwpd's WPXDocumentInterface class and libwpg's WPGPaintInterface are the only three classes that will be of interest for the application programmer using libmwaw.
If you are interrested in the structure of libmwaw itself, this whole document would be a good starting point for exploring the interals of libmwaw. Mind that this document is a work-in-progress, and will most likely not cover libmwaw for the full 100%.