Todo list the appender interface needs a better configuration system depending on the layout type. the udata field is a just a trick. the layout interface needs a better configuration system depending on the layout type. the udata field is a just a trick. a pattern layout would be welcomed !! the log4c_category_t is designed so that this method executes as quickly as possible. it could even be faster if the set priority was propagated through the children hierarchy of a category. need multiple appenders per category this is not used need to handle multi-threading (ndc)