$Revision$
$Date$
msgmain — The primary component of a message in a message set
               Every Msg must have one primary message.  This is stored in
               the MsgMain. The primary message is distinguished from
               any number of submessages (MsgSub) or related
               messages (MsgRel) that a Msg might have.
               
            
Formatted as a displayed block.
                  On the whole, the semantics of MsgSet
                  are not clearly defined.