(We may want make cute names for these, like Note, Beat, Baby, etc. for partition, Tune, Song, or just Profile for Profile)
Ideally every class belongs to one grape, a goal would be to reduce the size of the core or primordial grape and move all truly non-essential items into separate grapes in the core. ( a leading name is GRAPE, Groove Advanced Package Management)
The exact code to use for grape management is a discussion that is ongoing on the dev list. Options are
A Profile is a collection of these partitions. For example, an Applet Profile would include the Swing partition and the WebServices partition. The number of profiles should be kept relatively small. Strictly speaking any of these profiles could be created by installing the kernal and package management portions and installing the grapes in the profile. These exist as an external packaging and instillation convenience.