started a subdir for the book

book/examples/chapter2/TicketEng.gf

@@ -0,0 +1,19 @@
+concrete TicketEng of Ticket = {
+
+lincat
+  Request, Station = Str ;
+lin 
+  Ticket X Y = 
+    ((("I" ++ ("would like" | "want") ++ "to get" |
+      ("may" | "can") ++ "I get" | 
+      "can you give me" |
+      []) ++ 
+        "a ticket") | 
+     []) ++ 
+     "from" ++ X ++ "to" ++ Y ++ 
+     ("please" | []) ;
+
+  Hamburg = "Hamburg" ;
+  Paris = "Paris" ;
+
+}