gf-book web page index and toc

gf-book/examples/chapter2/LettersCnc.gf

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+concrete LettersCnc of Letters = {
+
+  lincat L = Str ;
+  lin 
+    a = "a" ;
+    b = "b" ;
+    c = "c" ;
+    d = "d" ;
+    e = "e" ;
+    f = "f" ;
+    g = "g" ;
+    h = "h" ;
+    i = "i" ;
+    j = "j" ;
+    k = "k" ;
+    l = "l" ;
+    m = "m" ;
+    n = "n" ;
+    o = "o" ;
+    p = "p" ;
+    q = "q" ;
+    r = "r" ;
+    s = "s" ;
+    t = "t" ;
+    u = "u" ;
+    v = "v" ;
+    w = "w" ;
+    x = "x" ;
+    y = "y" ;
+    z = "z" ;
+}