Graftals in GF. examples/graftals

examples/graftals/Graftal.gf

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+-- (c) Krasimir Angelov
+--
+-- The L-System is a grammar formalism which is used to describe 
+-- graftals (recursive graphical objects). It is interesting
+-- coincidence that every L-System grammar could be redefined
+-- as PMCFG grammar. This demo shows how to generate graftals
+-- using GF. The output from every concrete syntax is in postscript
+-- format.
+
+abstract Graftal = {
+cat N; S;
+fun z : N ;
+    s : N -> N ;
+    c : N -> S ;
+}