Graph-Controlled Systems — An Extension of OL systems

In a study of Lindenmayer developmental systems tabled OL systems(TOL systems, for short) has been investigated to examine the influence of changing environments on the growth of biological organism. For this purpose, many other extended types of OL systems have been proposed, and most of them concerns how one can control the way of applying tables to obtain a new language generating mechanism, and we observe that none of them try to give variety to tables themselves rather than the use of the tables.