A comment on draft-ietf-simple-chat-12

Hi,

a quick comment on draft-ietf-simple-chat-12 before I start its IETF LC:

http://tools.ietf.org/html/draft-ietf-simple-chat-12

Requirement 2 says the following:

 REQ-2:  A conference participant must be able to determine the
           identities of the sender and recipient of the received IMs.

A few lines below, requirements 5 and 7 talk about participants having
nicknames, pseudonyms, real identities, and anonymous identities.

What would be a good way to rephrase requirement 2 so that it is clear
what type of identity it refers to?

Thanks,

Gonzalo