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.

Optional Api is used to provide additional functionality
that can be included for a configuration or profile.
possible future stack will be CLDC1.1/MIDP2.0+MMAPI.
Ex: MMAPI,javax.microedition.lcdui.game,will come under
optional API