local tostring, type, next = tostring, type, next;
local t_concat = table.concat;
local st = require "util.stanza";
local jid_prep = require "util.jid".prep;
local tostring, type, next = tostring, type, next;
local t_concat = table.concat;
local st = require "util.stanza";
local jid_prep = require "util.jid".prep;