gf-book web page index and toc

gf-book/examples/chapter7/QueryFin.gf

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+concrete QueryFin of Query = {
+  lincat 
+    Answer, Question, Object = Str ;
+  lin 
+    Even  = pred "parillinen" ;
+    Odd   = pred "pariton" ;
+    Prime = pred "alkuluku" ;
+    Number i = i.s ;
+    Yes = "kyllä" ;
+    No = "ei" ;
+  oper
+    pred : Str -> Str -> Str = \f,x -> "onko" ++ x ++ f ;
+}