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@@ -20,6 +20,7 @@ Session is an abstract of Layer 4-7 connection, i.e., TCP Session, HTTP Session,
 - A session can derive child sessions.
 - All session has three states, which are Opening, Active, Closing.
 - State changes generate session events.
+
 Event is something happened in a session, i.e., TCP OPENING, HTTP Request, Session Extra Data updates.
 
 Session Extra Data is a developer defined data structure that attached to a session, it's lifetime is same as the session.