version 1 .
embeddedType EntityRef.Cap .

UserId = int .

Join = <joinedUser @uid UserId @handle #!Session>.

Session = @observeUsers <Observe =user @observer #!UserInfo>
        / @observeSpeech <Observe =says @observer #!Says>
        / NickClaim
        / Says
.

NickClaim = <claimNick @uid UserId @name string @k #!NickClaimResponse>.
NickClaimResponse = #t / NickConflict .

UserInfo = <user @uid UserId @name string>.

Says = <says @who UserId @what string>.

NickConflict = <nickConflict>.