Throughout this documentation, many iWay Service Manager-specific objects have a name that begins with the letters XD, such as XDDocument. This has been done to make it easier for the programmer to differentiate between iWay Service Manager objects and other objects in a program. There is no requirement that processing exits such as business agents or preparsers use this convention, or exist in any specific package. On the other hand, some objects that are loaded by design pattern name, such as protocol emitters, must have names that conform to their design pattern and must be filed in a specific package. Where such rules apply, they are clearly stated in this manual.