Export filter framework

The best thing to do in order to have a good understanding of what OO.o does when you save or export a file is to read the relevant code. A good place to start would be the SfxObjectShell::SaveTo_Impl(...) method in sfx2/source/doc/objstor.cxx. This method depicts the overall flow of the file save / file export operation, so reading that code will give you a good overview of the process. Beware, though, that the SaveTo_Impl method has roughly 600-lines of code in it. So, tracing the code there will probably drain a lot of your energy. Take a lot of vitamin before you start! :-)