godis tram grammars, augmented with Fin

examples/godis-tram/Tram/TramSystem.gf

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+--# -path=.:../Common:prelude
+
+abstract TramSystem = GodisSystem, Stops, Lines ** {
+
+cat
+Route; -- route descripiption.
+Leg; 
+[Leg]{2}; -- route segments on a line
+-- the following are derived from declaring [Leg]{2}:
+-- BaseLeg : Leg -> Leg -> [Leg];
+-- ConsLeg : Leg -> [Leg] -> [Leg];
+
+
+fun
+
+-----------------------------------------------------------------
+-- Functions for creating routes
+
+lineLeg : Line -> Stop -> Stop -> Leg;
+
+oneLeg  : Leg -> Route;
+mkRoute : [Leg] -> Route;
+
+-------------------------------------------------------------------
+-- Predicates
+-- Questions and Propositions as they are intended to be used 
+-- by either System or User
+
+-- U: what is the shortest route?
+shortest_route_Q : Question;
+
+-- S: Take Tram Z from X to Y. Take...
+shortest_route_P : Route -> Proposition;
+
+-- S: Where do you want to go to?
+dest_stop_Q : Question;
+
+-- U: I want to go to Stop
+dest_stop_P : Stop -> Proposition;
+
+-- S: Where do you want to go from?
+dept_stop_Q : Question;
+
+-- U: I want to go from Stop
+dept_stop_P : Stop -> Proposition;
+
+
+-----------------------------------------------------------------
+-- Short answers
+
+-- U: "klippan" 
+stop : Stop -> ShortAns;
+
+
+------------------------------------------------------------------
+-- Actions
+ 
+-- S: GoTGoDiS is a tram information system
+help: Action;
+
+-- S: restarting
+top: Action;
+
+}