{ "nummsgs": <?BSTR("__READLOOP:TOTALMSGS")>,
"startmsg": <?BSTR("__READLOOP:STARTMSG")>,
"roomname": "<?THISROOM:NAME("J")>",
"msgs": [ <?ITERATE("MAIL:SUMM:MSGS", ="mailsummary_json_section",
B("startmsg"), 0, B("stopmsg"))> ]
}