These methods follow the usual pattern opening with the keywords PREPROCESSING, PROCESSING and POSTPROCESSING. They create no output and the only external effects they can manifest are via Decoder Data Objects and by throwing exceptions. PreProcessing methods can also initialize values in ai64Field. You can have multiple PRE-, POST- and PROCESSING directives in a Decoder. Pre- and PostProcessing methods are used in the header, while Processing methods are used in individual FIELDs.
