Command = "!"cmd *(%d13 Command);
sp = " ";

cmd = "login" sp username / "logout" / "list" / "create" sp duration sp description/ "bid" sp id sp amount / "end" ;

username = *%d33-126; #all printable ascii chars without space

duration = *(%d48-57);

description = *(%d32-126); #20-255 all printable ascii with space

id = *%d48-57;

amount = *%d48-57["."2%d48-57];