 				paramsStr += (paramsStr ? '&' : '?') + key + '=' + params[key];
 			return serviceUrl + paramsStr;
 		}
-		/**
-		 * @param method Examples: "category", "category/series"
-		 * @param params Example: {category_id: 125}
-		 */
-		private function getJson(method:String, params:Object, handler:Function):void
-		{
-			jsonCache.getJsonObject(getUrl(method, params), handler);
-		}
 
 		public function createTopLevelNode():ColumnTreeNode
 		{

				label: data.name,
				hasChildBranches: true,
				children: function(node:ColumnTreeNode):Array {
					jsonCache.getJsonObject(baseUrl+"data.json", function(result:Object):void
						{
							data.result = result;
							for each (var dataSet:Object in result)

        private static const VARIABLES_DATA:String = "__CensusDataSource__variablesData";
        private static const GEOGRAPHY_DATA:String = "__CensusDataSource__geographyData";

        private static const GEOGRAPHY_LINK:String = "__CensusDataSource__geographyLink";
        private static const VARIABLES_LINK:String = "__CensusDataSource__variablesLink";

        private static const GEOGRAPHY_REQUIRES:String = "__CensusDataSource__geographyRequires";
        private static const GEOGRAPHY_NAME:String = "__CensusDataSource__geographyName";
