File access architecture

The document contains lists of items ; each item owns a reader object which is able to read the image or movie file associated with this item. The reader implements either the LynkeosImageFileReader protocol or the LynkeosMovieFileReader protocol, both being children of the LynkeosFileReader protocol.
When the window controller needs to save an image or a sequence in a file, it uses a writer object able to save it in the required format. The writer implements either the LynkeosImageFileWriter protocol or the LynkeosMovieFileWriter protocol, both being children of the LynkeosFileWriter protocol.