gf-book web page index and toc

gf-book/examples/chapter7/MapEng.gf

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+concrete MapEng of Map = {
+lincat
+  Query        = {s : Str} ;
+  Input, Place = {s : Str ; p : Str} ;
+  Click        = {p : Str} ;
+lin
+  GoFromTo x y = {
+    s = "I want to go from" ++ x.s ++ "to" ++ y.s ; 
+    p = x.p ++ y.p
+    } ;
+  ThisPlace c = {
+    s = "this place" ; 
+    p = c.p
+    } ;
+  QueryInput i = {s = i.s ++ ";" ++ i.p} ;
+  ClickCoord x y = {p = "(" ++ x.s ++ "," ++ y.s ++ ")"} ;
+}