gf-book web page index and toc

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diff --git a/gf-book/examples/chapter3/ResIta.gf b/gf-book/examples/chapter3/ResIta.gf
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+++ b/gf-book/examples/chapter3/ResIta.gf
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+resource ResIta = open Prelude in {
+  param
+    Number = Sg | Pl ;
+    Gender = Masc | Fem ;
+  oper
+    NounPhrase : Type = 
+      {s : Str ; g : Gender ; n : Number} ; 
+    Noun : Type = {s : Number => Str ; g : Gender} ;
+    Adjective : Type = {s : Gender => Number => Str} ;
+
+    det : Number -> Str -> Str -> Noun -> NounPhrase =
+      \n,m,f,cn -> {
+        s = table {Masc => m ; Fem => f} ! cn.g ++ 
+            cn.s ! n ;
+        g = cn.g ;
+        n = n
+      } ;
+    noun : Str -> Str -> Gender -> Noun =
+      \vino,vini,g -> {
+        s = table {Sg => vino ; Pl => vini} ;
+        g = g
+      } ;
+    adjective : (nero,nera,neri,nere : Str) -> Adjective =
+      \nero,nera,neri,nere -> {
+        s = table {
+          Masc => table {Sg => nero ; Pl => neri} ; 
+          Fem => table {Sg => nera ; Pl => nere}
+          }
+        } ;
+    regAdj : Str -> Adjective = \nero ->
+      let ner : Str = init nero 
+      in 
+      adjective nero (ner+"a") (ner+"i") (ner+"e") ;
+    copula : Number => Str = 
+      table {Sg => "è" ; Pl => "sono"} ;
+}