Also: forgot the evolution into its final form, which is a list of rule objects. A practical example: Your program starts out accepting a config file that loo

Also: forgot the evolution into its final form, which is a list of rule objects. A practical example: Your program starts out accepting a config file that looks like this: enableLogging: true Then it changes into: logLevel: WARN Then that becomes: logging: { level: WARN file: system.log } Then: logging: fileLogger: { level: WARN file: system.log } And finally: logging: - fileLogger: { level: WARN file: system.log } - consoleLogger: { level: DEBUG }