public abstract class AbstractContactGroupJabberImpl
The Jabber implementation of the service.protocol.ContactGroup interface. There
are two types of groups possible here. RootContactGroupJabberImpl
which is the root node of the ContactList itself and
ContactGroupJabberImpl which represents standard groups. The
reason for having those 2 is that generally, Jabber groups may not contain
subgroups. A contact list on the other hand may not directly contain buddies.
The reason for having an abstract class is only - being able to esily
recognize our own (Jabber) contacts.