local RFC = { suite   = 'IETF RFC',               serial  = '2018-08-25',               version = '1.0' }  local p = {}  local yn = require( 'Module:Yesno' )  -- I18n local rfcDefs = { 	plainLink = 'n',    -- default value 	rfc       = 'RFC ', -- RFC string before link 	rfcUrl    = '[//tools.ietf.org/html/rfc%s %s]' -- link string formatter }  function p.rfc( frame ) 	local rfcs = {}, k, v, n 	 	-- Getting arguments 	local args = frame:getParent().args 	args.plainlink = args.plainlink or '' 	if args.plainlink == '' then 		args.plainlink = rfcDefs.plainLink 	end 	args.leadout = args.leadout or ''  	-- Getting and linking RFCs 	for k, v in pairs( args ) do 		v = mw.text.trim( v ) 		n = tonumber( v ) 		if tonumber( k ) and n and ( n == math.floor( n ) ) then 			table.insert( rfcs, string.format( rfcDefs.rfcUrl, v, v ) ) 		end 	end  	-- Formatting RFCs 	n = '' 	if #rfcs > 0 then 		n = table.concat( rfcs, ', ' ) 		if args.leadout ~= '' then 			n = n:gsub( ',([^,]*)$' , ' ' .. args.leadout .. '%1' ) 		end 		if not yn( args.plainlink, rfcDefs.plainLink ~= 'n' ) then 			n = rfcDefs.rfc .. n 		end 	end  	return n end  return p