Groups

A group is a collection of objects and is a sub-unit of a track (Section 2.4). Groups SHOULD be indendepently useful, so objects within a group SHOULD NOT depend on objects in other groups. A group provides a join point for subscriptions, so a subscriber that does not want to receive the entire track can opt to receive only the latest group(s). The publisher then selectively transmits objects based on their group membership. Groups can contain any number of objects.

Groups are ordered numerically by their Group ID.