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The design language PLaSM is a geometry-oriented extension of a subset of FL.

FL Language

FL (programming at Function Level) is a language developed by the Functional Programming Group of IBM Research Division at Almaden (USA) [BWW90, BWWLA89]. The FL language, on the line of the Backus' Turing lecture [Backus78] introduces an algebra over programs and has an awesome expressive power.

PLaSM Language

PLaSM, (the Programming LAnguage for Solid Modeling) is a "design language" for geometric and solid parametric design, developed by the CAD Group at the Universities "La Sapienza" and "Roma Tre" [PS92, PPV95]. The language is strongly inFLuenced by FL. With few sintactical differences, it can be considered a geometric extension of a FL subset. 

PLaSM is Free Software and may be distributed under GNU LGPL