(function () {

    "use strict";

    angular.module("topoJsonServiceModule", [])
           .factory("topoJsonService", [function () {
               var myTopoJson = topojson;

               // No globals allowed. Topojson is only usable through this service.
               topojson = undefined;

               if (myTopoJson === undefined)
                   throw new Error("TopoJson service is undefined.");

               return myTopoJson;
           }]);

}());