gf-book web page index and toc

gf-book/examples/chapter5/FoodsCat.gf

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+--# -path=.:present
+
+-- (c) 2009 Jordi Saludes under LGPL
+
+concrete FoodsCat of Foods = FoodsI with 
+  (Syntax = SyntaxCat),
+  (LexFoods = LexFoodsCat) ;