ChangesSince(arg1)
DeleteItem(arg1)
GetCurrentPresence()
GetCurrentRosterVersion()
GetItem(arg1)
GetItems()
GetRosterSize()
RemoveSubscriptionRequest(arg1)
RetrieveStoredSubscriptionRequests()
SetCurrentPresence(arg1)
StoreSubscriptionRequest(arg1 arg2)
UpdateOrAddRosterItem(arg1 arg2)