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Batched NOTIFY Bundled notification (reverse of RLS) One or more watchers subscribe to multiple presentities in same or another domain Presentity’s presence server sends a single aggregated NOTIFY To watcher – per watcher aggregation To watcher domain presence server – per domain aggregation Watcher domain presence server distributes NOTIFY messages to individual watchers Multiple presence document in same NOTIFY MIME multipart – PIDF concatenation, PIDF-diff concatenation Identifying and sending the changes only ? new event package |