“…This approach is followed by Mrncke c.s. in [19] for OPTRAN [11], a language and a system designed to describe and to perform tree transformations, by Alblas in [3], and also by Reps c.s. in [6,23,24], Yeh in [26] and Engelfriet in [8] for syntax directed editing, where the decisions to re-evaluate attributes are made on the fly, i.e., at compile time.…”