Optional package:
An optional package is a set of J2ME APIs providing services in a specific
area, such as database access or multimedia. Unlike a profile, it does not define a complete application
environment, but rather is used in conjunction with a configuration or a profile. It extends the runtime
environment to support device
capabilities that are not universal enough to be defined as part of a
profile or that need to be shared by different profiles. J2ME RMI and the Mobile Media RMI are examples of
optional packages.