Different clients have different ways to determne if message is read by the 
user. For example, the client I'm developing right now has 2 absolutely 
disfferent ways. So, I think <read /> message is better way to determine that 
message is read by the user, than attempts to guess about it analysing chat 
states.
I think it's better to allow client to have an ability to notify other side 
that it suppose, that user read the message.

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