indexing description: "Object that defines application constants." author: "Peizhu Li" date: "$Date$" revision: "$0.3.1$" class SYSTEM_CONSTANTS feature -- Access app_working_folder: STRING is ".\" app_db_folder: STRING is ".\db\" users_file_name: STRING is "user_list.db" -- user roles ROLE_GUEST: INTEGER is 0 ROLE_NORMAL_USER: INTEGER is 1 ROLE_ADMINISTRATOR: INTEGER is 2 invariant invariant_clause: True -- Your invariant here end