We have now successfully designed, implemented, and tested the first version of our Family Tree modeling language. This is, however, still only the beginning. Usually at this stage we have learned certain new things about our problem domain that require us to change, or at least to fine-tune, our modeling language. Let us now look at a couple of improvements for our Family Tree modeling language, and get familiar with some of the more advanced metamodeling and modeling concepts provided by MetaEdit+