Mô đun:Citation/CS1/sandbox

require ('strict');
------------------------------------------------------------------
each of these counts against the Lua upvalue limit
local validation;																-- functions in Module:Citation/CS1/Date_validation
local utilities;																-- functions in Module:Citation/CS1/Utilities
local z = {};																	-- table of tables in Module:Citation/CS1/Utilities
local identifiers;																-- functions and tables in Module:Citation/CS1/Identifiers
local metadata;																	-- functions in Module:Citation/CS1/COinS
local cfg = {};																	-- table of configuration tables that are defined in Module:Citation/CS1/Configuration
local whitelist = {};															-- table of tables listing valid template parameter names; defined in Module:Citation/CS1/Whitelist
local contentLanguage = mw.getContentLanguage()
-----------------------------------
declare variables here that have page-wide scope that are not brought in from
other modules; that are created here and used here
local added_deprecated_cat;														-- Boolean flag so that the category is added only once
local added_vanc_errs;															-- Boolean flag so we only emit one Vancouver error / category
local added_generic_name_errs;													-- Boolean flag so we only emit one generic name error / category and stop testing names once an error is encountered
local added_numeric_name_errs;													-- Boolean flag so we only emit one numeric name error / category and stop testing names once an error is encountered
local added_numeric_name_maint;													-- Boolean flag so we only emit one numeric name maint category and stop testing names once a category has been emitted
local is_preview_mode;															-- true when article is in preview mode; false when using 'Preview page with this template' (previewing the module)
local is_sandbox;																-- true when using sandbox modules to render citation
---Định dạng ngày tháng.
local function vi_formatdate(rawDate, dayPrefix)
	local formatStr = 'j "tháng" n "năm" Y'
	rawDate = mw.ustring.gsub(rawDate, "Tháng", "tháng", 1)
	if dayPrefix then formatStr = '"ngày" ' .. formatStr end
	
	-- Khoảng năm "c." hoặc "k."
	if mw.ustring.match(rawDate, "^%s*ck%.%s*%d%d%d%d?$") then
		rawDate = mw.ustring.gsub(rawDate, "c.", "k.", 1)
		return mw.text.trim(rawDate)
	end
	-- Năm
	if tonumber(rawDate) or mw.ustring.match(rawDate, "^1-9%d%d%d?%a?$") then
		return mw.text.trim(rawDate)
	-- Năm tháng
	elseif mw.ustring.match(rawDate, "^Ttháng %d%d?,? %d%d%d%d?$") or
		mw.ustring.match(rawDate, "^Ttháng %d%d?,? năm %d%d%d%d?$") or
		mw.ustring.match(rawDate, "^Ttháng %a+,? năm %d%d%d%d?$") or
		mw.ustring.match(rawDate, "^%a+%.?,? %d%d%d%d?$") or
		mw.ustring.match(rawDate, "^%d%d%d%d?%-%d%d$") then
		rawDate = mw.ustring.gsub(rawDate, ",", "")
		formatStr = '"tháng" n "năm" Y'
	-- Ngày tháng năm
	elseif mw.ustring.match(rawDate, "^Nngày %d%d? tháng %d%d? năm %d%d%d%d?$") then
		local day, month, year = mw.ustring.match(rawDate, "^Nngày (%d%d?) tháng (%d%d?) năm (%d%d%d%d?)$")
		rawDate = string.format("%s-%s-%s", year, month, day)
	elseif mw.ustring.match(rawDate, "^%d%d? tháng %d%d? năm %d%d%d%d?$") then
		local day, month, year = mw.ustring.match(rawDate, "^(%d%d?) tháng (%d%d?) năm (%d%d%d%d?)$")
		rawDate = string.format("%s-%s-%s", year, month, day)
	end
	
	local good, formattedDate = pcall(contentLanguage.formatDate, contentLanguage, formatStr, rawDate)
	if good then
		-- Xóa bỏ số 0 ở ngày có năm 3 chữ số như "ngày 1 tháng 1 năm 0789" thành "ngày 1 tháng 1 năm 789"
		formattedDate = mw.ustring.gsub(formattedDate, "năm 0", "năm ")
		return formattedDate
	else
		return rawDate
	end
end
function z._vi_formatdate(frame)
	return vi_formatdate(frame.args1, frame.args2)
end
---Định dạng số ấn bản.
local function vi_formatedition(rawEdition)
	if tonumber(rawEdition) then return rawEdition end
	
	local num = mw.ustring.match(rawEdition, "(%d+)th") or
	mw.ustring.match(rawEdition, "(%d+)st") or
	mw.ustring.match(rawEdition, "(%d+)nd") or
	mw.ustring.match(rawEdition, "(%d+)rd")
	
	return num or ""
end
function z._vi_formatedition(frame)
	return vi_formatedition(frame.args1)
end
----------------------------------------------------------------------------------------
Locates and returns the first set value in a table of values where the order established in the table,
left-to-right (or top-to-bottom), is the order in which the values are evaluated.  Returns nil if none are set.
This version replaces the original 'for _, val in pairs do' and a similar version that used ipairs.  With the pairs
version the order of evaluation could not be guaranteed.  With the ipairs version, a nil value would terminate
the for-loop before it reached the actual end of the list.
local function first_set (list, count)
	local i = 1;
	while i ----------------------------------------------------
Adds a single Vancouver system error message to the template's output regardless of how many error actually exist.
To prevent duplication, added_vanc_errs is nil until an error message is emitted.
added_vanc_errs is a Boolean declared in page scope variables above
local function add_vanc_error (source, position)
	if added_vanc_errs then return end
		
	added_vanc_errs = true;														-- note that we've added this category
	utilities.set_message ('err_vancouver', {source, position});
end
----------------------------------------------------------------------------------------
does this thing that purports to be a URI scheme seem to be a valid scheme?  The scheme is checked to see if it
is in agreement with http://tools.ietf.org/html/std66#section-3.1 which says:
	Scheme names consist of a sequence of characters beginning with a
letter and followed by any combination of letters, digits, plus
("+"), period ("."), or hyphen ("-").
returns true if it does, else false
local function is_scheme (scheme)
	return scheme and scheme:match ('^%a%a%d%+%.%-*:');						-- true if scheme is set and matches the pattern
end
--=---------------------------------------------------------------------------
Does this thing that purports to be a domain name seem to be a valid domain name?
Syntax defined here: http://tools.ietf.org/html/rfc1034#section-3.5
BNF defined here: https://tools.ietf.org/html/rfc4234
Single character names are generally reserved; see https://tools.ietf.org/html/draft-ietf-dnsind-iana-dns-01#page-15;
	see also Single-letter second-level domain
list of TLDs: https://www.iana.org/domains/root/db
RFC 952 (modified by RFC 1123) requires the first and last character of a hostname to be a letter or a digit.  Between
the first and last characters the name may use letters, digits, and the hyphen.
Also allowed are IPv4 addresses. IPv6 not supported
domain is expected to be stripped of any path so that the last character in the last character of the TLD.  tld
is two or more alpha characters.  Any preceding '//' (from splitting a URL with a scheme) will be stripped
here.  Perhaps not necessary but retained in case it is necessary for IPv4 dot decimal.
There are several tests:
	the first character of the whole domain name including subdomains must be a letter or a digit
	internationalized domain name (ASCII characters with .xn-- ASCII Compatible Encoding (ACE) prefix xn-- in the TLD) see https://tools.ietf.org/html/rfc3490
	single-letter/digit second-level domains in the .org, .cash, and .today TLDs
	q, x, and z SL domains in the .com TLD
	i and q SL domains in the .net TLD
	single-letter SL domains in the ccTLDs (where the ccTLD is two letters)
	two-character SL domains in gTLDs (where the gTLD is two or more letters)
	three-plus-character SL domains in gTLDs (where the gTLD is two or more letters)
	IPv4 dot-decimal address format; TLD not allowed
returns true if domain appears to be a proper name and TLD or IPv4 address, else false
**
local function is_domain_name (domain)
	if not domain then
		return false;															-- if not set, abandon
	end
	
	domain = domain:gsub ('^//', );											-- strip '//' from domain name if present; done here so we only have to do it once
	
	if not domain:match ('^%w') then											-- first character must be letter or digit
		return false;
	end
	if domain:match ('^%a+:') then												-- hack to detect things that look like s:Page:Title where Page: is namespace at Wikisource
		return false;
	end
	local patterns = {															-- patterns that look like URLs
		'%f%w%w%w%-+%w%.%a%a+$',										-- three or more character hostname.hostname or hostname.tld
		'%f%w%w%w%-+%w%.xn%-%-%w+$',									-- internationalized domain name with ACE prefix
		'%f%aqxz%.com$',													-- assigned one character .com hostname (x.com times out 2015-12-10)
		'%f%aiq%.net$',														-- assigned one character .net hostname (q.net registered but not active 2015-12-10)
		'%f%w%w%.%a%a$',													-- one character hostname and ccTLD (2 chars)
		'%f%w%w%w%.%a%a+$',												-- two character hostname and TLD
		'^%d%d?%d?%.%d%d?%d?%.%d%d?%d?%.%d%d?%d?',								-- IPv4 address
		'%a%d+%:?'                                                            -- IPv6 address
		}
	for _, pattern in ipairs (patterns) do										-- loop through the patterns list
		if domain:match (pattern) then
			return true;														-- if a match then we think that this thing that purports to be a URL is a URL
		end
	end
	for _, d in ipairs (cfg.single_letter_2nd_lvl_domains_t) do					-- look for single letter second level domain names for these top level domains
		if domain:match ('%f%w%w%.' .. d) then
			return true
		end
	end
	return false;																-- no matches, we don't know what this thing is
end
----------------------------------------------------------------------------------------------
returns true if the scheme and domain parts of a URL appear to be a valid URL; else false.
This function is the last step in the validation process.  This function is separate because there are cases that
are not covered by split_url(), for example is_parameter_ext_wikilink() which is looking for bracketted external
wikilinks.
local function is_url (scheme, domain)
	if utilities.is_set (scheme) then											-- if scheme is set check it and domain
		return is_scheme (scheme) and is_domain_name (domain);
	else
		return is_domain_name (domain);											-- scheme not set when URL is protocol-relative
	end
end
----------------------------------------------------------------------------------------
Split a URL into a scheme, authority indicator, and domain.
First remove Fully Qualified Domain Name terminator (a dot following TLD) (if any) and any path(/), query(?) or fragment(#).
If protocol-relative URL, return nil scheme and domain else return nil for both scheme and domain.
When not protocol-relative, get scheme, authority indicator, and domain.  If there is an authority indicator (one
or more '/' characters immediately following the scheme's colon), make sure that there are only 2.
Any URL that does not have news: scheme must have authority indicator (//).  TODO: are there other common schemes
like news: that don't use authority indicator?
Strip off any port and path;
local function split_url (url_str)
	local scheme, authority, domain;
	
	url_str = url_str:gsub ('(%a%d)%.?/%?#.*$', '%1');						-- strip FQDN terminator and path(/), query(?), fragment (#) (the capture prevents false replacement of '//')
	if url_str:match ('^//%S*') then											-- if there is what appears to be a protocol-relative URL
		domain = url_str:match ('^//(%S*)')
	elseif url_str:match ('%S-:/*%S+') then										-- if there is what appears to be a scheme, optional authority indicator, and domain name
		scheme, authority, domain = url_str:match ('(%S-:)(/*)(%S+)');			-- extract the scheme, authority indicator, and domain portions
		if utilities.is_set (authority) then
			authority = authority:gsub ('//', , 1);							-- replace place 1 pair of '/' with nothing;
			if utilities.is_set(authority) then									-- if anything left (1 or 3+ '/' where authority should be) then
				return scheme;													-- return scheme only making domain nil which will cause an error message
			end
		else
			if not scheme:match ('^news:') then									-- except for news:..., MediaWiki won't link URLs that do not have authority indicator; TODO: a better way to do this test?
				return scheme;													-- return scheme only making domain nil which will cause an error message
			end
		end
		domain = domain:gsub ('(%a):%d+', '%1');								-- strip port number if present
	end
	
	return scheme, domain;
end
-------------------------------------------------------------------------------
checks the content of |title-link=, |series-link=, |author-link=, etc. for properly formatted content: no wikilinks, no URLs
Link parameters are to hold the title of a Wikipedia article, so none of the WP:TITLESPECIALCHARACTERS are allowed:
	#    | { } _
except the underscore which is used as a space in wiki URLs and # which is used for section links
returns false when the value contains any of these characters.
When there are no illegal characters, this function returns TRUE if value DOES NOT appear to be a valid URL (the
local function link_param_ok (value)
	local scheme, domain;
	if value:find ('%%|{}') then                                          -- if any prohibited characters
		return false;
	end
	scheme, domain = split_url (value);											-- get scheme or nil and domain or nil from URL; 
	return not is_url (scheme, domain);											-- return true if value DOES NOT appear to be a valid URL
end
---link= has a value.  This function emits an error message when
that condition exists
check  for inter-language interwiki-link prefix.  prefix must be a MediaWiki-recognized language
code and must begin with a colon.
local function link_title_ok (link, lorig, title, torig)
	local orig;
	if utilities.is_set (link) then 											-- don't bother if -link doesn't have a value
		if not link_param_ok (link) then										-- check 
			orig = lorig;														-- identify the failing link parameter
		elseif title:find ('%%') then											-- check |title= for wikilink markup
			orig = torig;														-- identify the failing |title= parameter
		elseif link:match ('^%a+:') then										-- if the link is what looks like an interwiki
			local prefix = link:match ('^(%a+):'):lower();						-- get the interwiki prefix
			if cfg.inter_wiki_mapprefix then									-- if prefix is in the map, must have preceding colon
				orig = lorig;													-- flag as error
			end
		end
	end
	if utilities.is_set (orig) then
		link = ;																-- unset
		utilities.set_message ('err_bad_paramlink', orig);						-- URL or wikilink in |title= with |title-link=;
	end
	
	return link;																-- link if ok, empty string else
end
----------------------------------------------------------------------------------------
Determines whether a URL string appears to be valid.
First we test for space characters.  If any are found, return false.  Then split the URL into scheme and domain
portions, or for protocol-relative (//example.com) URLs, just the domain.  Use is_url() to validate the two
portions of the URL.  If both are valid, or for protocol-relative if domain is valid, return true, else false.
Because it is different from a standard URL, and because this module used external_link() to make external links
that work for standard and news: links, we validate newsgroup names here.  The specification for a newsgroup name
is at https://tools.ietf.org/html/rfc5536#section-3.1.4
local function check_url( url_str )
	if nil == url_str:match ("^%S+$") then										-- if there are any spaces in |url=value it can't be a proper URL
		return false;
	end
	local scheme, domain;
	scheme, domain = split_url (url_str);										-- get scheme or nil and domain or nil from URL;
	
	if 'news:' == scheme then													-- special case for newsgroups
		return domain:match('^%a%d%+%-_+%.%a%d%+%-_%.*%a%d%+%-_$');
	end
	
	return is_url (scheme, domain);												-- return true if value appears to be a valid URL
end
--=-----------------------------------------------------
Return true if a parameter value has a string that begins and ends with square brackets  and  and the first
non-space characters following the opening bracket appear to be a URL.  The test will also find external wikilinks
that use protocol-relative URLs. Also finds bare URLs.
The frontier pattern prevents a match on interwiki-links which are similar to scheme:path URLs.  The tests that
find bracketed URLs are required because the parameters that call this test (currently |title=, |chapter=, |work=,
and |publisher=) may have wikilinks and there are articles or redirects like '//Hus' so, while uncommon, |title=//Hus
is possible as might be .
**
local function is_parameter_ext_wikilink (value)
local scheme, domain;
	if value:match ('%f%%%a%S*:%S+.*%') then								-- if ext. wikilink with scheme and domain: 
		scheme, domain = split_url (value:match ('%f%%(%a%S*:%S+).*%'));
	elseif value:match ('%f%%//%S+.*%') then								-- if protocol-relative ext. wikilink: //yyyyy.zzz
		scheme, domain = split_url (value:match ('%f%%(//%S+).*%'));
	elseif value:match ('%a%S*:%S+') then										-- if bare URL with scheme; may have leading or trailing plain text
		scheme, domain = split_url (value:match ('(%a%S*:%S+)'));
	elseif value:match ('^//%S+') or value:match ('%s//%S+') then				-- if protocol-relative bare URL: //yyyyy.zzz; authority indicator (//) must be be preceded nothing or by whitespace
		scheme, domain = split_url (value:match ('(//%S+)'));					-- what is left should be the domain
	else
		return false;															-- didn't find anything that is obviously a URL
	end
	return is_url (scheme, domain);												-- return true if value appears to be a valid URL
end
--------------------------------------------------------------------------------
loop through a list of parameters and their values.  Look at the value and if it has an external link, emit an error message.
local function check_for_url (parameter_list, error_list)
	for k, v in pairs (parameter_list) do										-- for each parameter in the list
		if is_parameter_ext_wikilink (v) then									-- look at the value; if there is a URL add an error message
			table.insert (error_list, utilities.wrap_style ('parameter', k));
		end
	end
end
----------------------------------------------------------------------------------
Escape sequences for content that will be used for URL descriptions
local function safe_for_url( str )
	if str:match( "%%.-%%" ) ~= nil then 
		utilities.set_message ('err_wikilink_in_url', {});
	end
	
	return str:gsub( '%%\n', {	
		 = ,
		 = ,
		'\n' = ' ' } );
end
--------------------------------------------------------------------------------
Format an external link with error checking
local function external_link (URL, label, source, access)
	local err_msg = ;
	local domain;
	local path;
	local base_url;
	if not utilities.is_set (label) then
		label = URL;
		if utilities.is_set (source) then
			utilities.set_message ('err_bare_url_missing_title', {utilities.wrap_style ('parameter', source)});
		else
			error (cfg.messages"bare_url_no_origin");							-- programmer error; valid parameter name does not have matching meta-parameter
		end			
	end
	if not check_url (URL) then
		utilities.set_message ('err_bad_url', {utilities.wrap_style ('parameter', source)});
	end
	
	domain, path = URL:match ('^(/%.%-%+:%a%d+)(/%?#.*)$');					-- split the URL into scheme plus domain and path
	if path then																-- if there is a path portion
		path = path:gsub ('%%', { = '%5b',  = '%5d'});			-- replace  and  with their percent-encoded values
		URL = table.concat ({domain, path});									-- and reassemble
	end
	base_url = table.concat ({ "", URL, " ", safe_for_url (label), "" });		-- assemble a wiki-markup URL
	if utilities.is_set (access) then											-- access level (subscription, registration, limited)
		base_url = utilities.substitute (cfg.presentation'ext-link-access-signal', {cfg.presentationaccess.class, cfg.presentationaccess.title, base_url});	-- add the appropriate icon
	end
	return base_url;
end
------------------------------------------------------------------
Categorize and emit an error message when the citation contains one or more deprecated parameters.  The function includes the
offending parameter name to the error message.  Only one error message is emitted regardless of the number of deprecated
parameters in the citation.
added_deprecated_cat is a Boolean declared in page scope variables above
local function deprecated_parameter(name)
	if not added_deprecated_cat then
		added_deprecated_cat = true;											-- note that we've added this category
		utilities.set_message ('err_deprecated_params', {name});				-- add error message
	end
end
--=---------------------------------------------------------------------------------
Apply kerning to open the space between the quote mark provided by the module and a leading or trailing quote
mark contained in a |title= or |chapter= parameter's value.
This function will positive kern either single or double quotes:
	"'Unkerned title with leading and trailing single quote marks'"
	" 'Kerned title with leading and trailing single quote marks' " (in real life the kerning isn't as wide as this example)
Double single quotes (italic or bold wiki-markup) are not kerned.
Replaces Unicode quote marks in plain text or in the label portion of a D style wikilink with typewriter
quote marks regardless of the need for kerning.  Unicode quote marks are not replaced in simple D wikilinks.
Call this function for chapter titles, for website titles, etc.; not for book titles.
**
local function kern_quotes (str)
	local cap = ;
	local wl_type, label, link;
	wl_type, label, link = utilities.is_wikilink (str);							-- wl_type is: 0, no wl (text in label variable); 1, D; 2, D
	
	if 1 == wl_type then														-- D simple wikilink with or without quote marks
		if mw.ustring.match (str, '%%\"“”\'‘’.+\"“”\'‘’%%') then		-- leading and trailing quote marks
			str = utilities.substitute (cfg.presentation'kern-left', str);
			str = utilities.substitute (cfg.presentation'kern-right', str);
		elseif mw.ustring.match (str, '%%\"“”\'‘’.+%%')	then			-- leading quote marks
			str = utilities.substitute (cfg.presentation'kern-left', str);
		elseif mw.ustring.match (str, '%%.+\"“”\'‘’%%') then				-- trailing quote marks
			str = utilities.substitute (cfg.presentation'kern-right', str);
		end
	else																		-- plain text or D; text in label variable
		label = mw.ustring.gsub (label, '“”', '\"');							-- replace “” (U+201C & U+201D) with " (typewriter double quote mark)
		label = mw.ustring.gsub (label, '‘’', '\);							-- replace ‘’ (U+2018 & U+2019) with ' (typewriter single quote mark)
		cap = mw.ustring.match (label, "^(\"\'^\'.+)");						-- match leading double or single quote but not doubled single quotes (italic markup)
		if utilities.is_set (cap) then
			label = utilities.substitute (cfg.presentation'kern-left', cap);
		end
	
		cap = mw.ustring.match (label, "^(.+^\'\"\')$")						-- match trailing double or single quote but not doubled single quotes (italic markup)
		if utilities.is_set (cap) then
			label = utilities.substitute (cfg.presentation'kern-right', cap);
		end
		
		if 2 == wl_type then
			str = utilities.make_wikilink (link, label);						-- reassemble the wikilink
		else
			str = label;
		end
	end
	return str;
end
--script-=
local function format_script_value (script_value, script_param)
	local lang=;																-- initialize to empty string
	local name;
	if script_value:match('^%l%l%l?%s*:') then									-- if first 3 or 4 non-space characters are script language prefix
		lang = script_value:match('^(%l%l%l?)%s*:%s*%S.*');						-- get the language prefix or nil if there is no script
		if not utilities.is_set (lang) then
			utilities.set_message ('err_script_parameter', {script_param, cfg.err_msg_supl'missing title part'});		-- prefix without 'title'; add error message
			return ;															-- script_value was just the prefix so return empty string
		end
																				-- if we get this far we have prefix and script
		name = cfg.lang_tag_remaplang or mw.language.fetchLanguageName( lang, cfg.this_wiki_code );	-- get language name so that we can use it to categorize
		if utilities.is_set (name) then											-- is prefix a proper ISO 639-1 language code?
			name = mw.ustring.gsub(name, '^Ttiếng ', , 1);
			script_value = script_value:gsub ('^%l+%s*:%s*', );				-- strip prefix from script
																				-- is prefix one of these language codes?
			if utilities.in_array (lang, cfg.script_lang_codes) then
				utilities.add_prop_cat ('script', {name, lang})
			else
				utilities.set_message ('err_script_parameter', {script_param, cfg.err_msg_supl'unknown language code'});	-- unknown script-language; add error message
			end
			lang = ' lang="' .. lang .. '" ';									-- convert prefix into a lang attribute
		else
			utilities.set_message ('err_script_parameter', {script_param, cfg.err_msg_supl'invalid language code'});		-- invalid language code; add error message
			lang = ;															-- invalid so set lang to empty string
		end
	else
		utilities.set_message ('err_script_parameter', {script_param, cfg.err_msg_supl'missing prefix'});				-- no language code prefix; add error message
	end
	script_value = utilities.substitute (cfg.presentation'bdi', {lang, script_value});	-- isolate in case script is RTL
	return script_value;
end
--script-title=, this function concatenates those two parameter values after the script
value has been wrapped in  tags.
local function script_concatenate (title, script, script_param)
	if utilities.is_set (script) then
		script = format_script_value (script, script_param);					--  tags, lang attribute, categorization, etc.; returns empty string on error
		if utilities.is_set (script) then
			title = title .. ' ' .. script;										-- concatenate title and script title
		end
	end
	return title;
end
------------------------------------------------------------------------------------------
Applies additional message text to various parameter values. Supplied string is wrapped using a message_list
configuration taking one argument.  Supports lower case text for  templates.  Additional text taken
from citation_config.messages - the reason this function is similar to but separate from wrap_style().
local function wrap_msg (key, str, lower)
	if not utilities.is_set ( str ) then
		return "";
	end
	if true == lower then
		local msg;
		msg = cfg.messageskey:lower();										-- set the message to lower case before 
		return utilities.substitute ( msg, str );								-- including template text
	else
		return utilities.substitute ( cfg.messageskey, str );
	end		
end
--title-link=
local function wikisource_url_make (str)
	local wl_type, D, L;
	local ws_url, ws_label;
	local wikisource_prefix = table.concat ({'https://', cfg.this_wiki_code, '.wikisource.org/wiki/'});
	wl_type, D, L = utilities.is_wikilink (str);								-- wl_type is 0 (not a wikilink), 1 (simple wikilink), 2 (complex wikilink)
	if 0 == wl_type then														-- not a wikilink; might be from |title-link=
		str = D:match ('^Wwikisource:(.+)') or D:match ('^Ss:(.+)');		-- article title from interwiki link with long-form or short-form namespace
		if utilities.is_set (str) then
			ws_url = table.concat ({											-- build a Wikisource URL
				wikisource_prefix,												-- prefix
				str,															-- article title
				});
			ws_label = str;														-- label for the URL
		end
	elseif 1 == wl_type then													-- simple wikilink: Wikisource:ws article
		str = D:match ('^Wwikisource:(.+)') or D:match ('^Ss:(.+)');		-- article title from interwiki link with long-form or short-form namespace
		if utilities.is_set (str) then
			ws_url = table.concat ({											-- build a Wikisource URL
				wikisource_prefix,												-- prefix
				str,															-- article title
				});
			ws_label = str;														-- label for the URL
		end
	elseif 2 == wl_type then													-- non-so-simple wikilink: displayed text (D)
		str = L:match ('^Wwikisource:(.+)') or L:match ('^Ss:(.+)');		-- article title from interwiki link with long-form or short-form namespace
		if utilities.is_set (str) then
			ws_label = D;														-- get ws article name from display portion of interwiki link
			ws_url = table.concat ({											-- build a Wikisource URL
				wikisource_prefix,												-- prefix
				str,															-- article title without namespace from link portion of wikilink
				});
		end
	end
	if ws_url then
		ws_url = mw.uri.encode (ws_url, 'WIKI');								-- make a usable URL
		ws_url = ws_url:gsub ('%%23', '#');										-- undo percent-encoding of fragment marker
	end
	return ws_url, ws_label, L or D;											-- return proper URL or nil and a label or nil
end
--trans-= into a single Periodical meta-parameter.
local function format_periodical (script_periodical, script_periodical_source, periodical, trans_periodical)
	if not utilities.is_set (periodical) then
		periodical = ;														-- to be safe for concatenation
	else
		periodical = utilities.wrap_style ('italic-title', periodical);			-- style 
	end
	periodical = script_concatenate (periodical, script_periodical, script_periodical_source);	--  tags, lang attribute, categorization, etc.; must be done after title is wrapped
	if utilities.is_set (trans_periodical) then
		trans_periodical = utilities.wrap_style ('trans-italic-title', trans_periodical);
		if utilities.is_set (periodical) then
			periodical = periodical .. ' ' .. trans_periodical;
		else																	-- here when trans-periodical without periodical or script-periodical
			periodical = trans_periodical;
			utilities.set_message ('err_trans_missing_title', {'periodical'});
		end
	end
	return periodical;
end
--chapter-url= into a single chapter meta- parameter (chapter_url_source used
for error messages).
local function format_chapter_title (script_chapter, script_chapter_source, chapter, chapter_source, trans_chapter, trans_chapter_source, chapter_url, chapter_url_source, no_quotes, access)
	local ws_url, ws_label, L = wikisource_url_make (chapter);					-- make a wikisource URL and label from a wikisource interwiki link
	if ws_url then
		ws_label = ws_label:gsub ('_', ' ');									-- replace underscore separators with space characters
		chapter = ws_label;
	end
	if not utilities.is_set (chapter) then
		chapter = ;															-- to be safe for concatenation
	else
		if false == no_quotes then
			chapter = kern_quotes (chapter);									-- if necessary, separate chapter title's leading and trailing quote marks from module provided quote marks
			chapter = utilities.wrap_style ('quoted-title', chapter);
		end
	end
	chapter = script_concatenate (chapter, script_chapter, script_chapter_source);	--  tags, lang attribute, categorization, etc.; must be done after title is wrapped
	if utilities.is_set (chapter_url) then
		chapter = external_link (chapter_url, chapter, chapter_url_source, access);	-- adds bare_url_missing_title error if appropriate
	elseif ws_url then
		chapter = external_link (ws_url, chapter .. ' ', 'ws link in chapter');	-- adds bare_url_missing_title error if appropriate; space char to move icon away from chap text; TODO: better way to do this?
		chapter = utilities.substitute (cfg.presentation'interwiki-icon', {cfg.presentation'class-wikisource', L, chapter});				
	end
	if utilities.is_set (trans_chapter) then
		trans_chapter = utilities.wrap_style ('trans-quoted-title', trans_chapter);
		if utilities.is_set (chapter) then
			chapter = chapter .. ' ' .. trans_chapter;
		else																	-- here when trans_chapter without chapter or script-chapter
			chapter = trans_chapter;
			chapter_source = trans_chapter_source:match ('trans%-?(.+)');		-- when no chapter, get matching name from trans-
			utilities.set_message ('err_trans_missing_title', {chapter_source});
		end
	end
	return chapter;
end
-------------------------------------
This function searches a parameter's value for non-printable or invisible characters.
The search stops at the first match.
This function will detect the visible replacement character when it is part of the Wikisource.
Detects but ignores nowiki and math stripmarkers.  Also detects other named stripmarkers
(gallery, math, pre, ref) and identifies them with a slightly different error message.
See also coins_cleanup().
Output of this function is an error message that identifies the character or the
Unicode group, or the stripmarker that was detected along with its position (or,
for multi-byte characters, the position of its first byte) in the parameter value.
local function has_invisible_chars (param, v)
	local position = ;														-- position of invisible char or starting position of stripmarker
	local capture;																-- used by stripmarker detection to hold name of the stripmarker
	local stripmarker;															-- boolean set true when a stripmarker is found
	capture = string.match (v, '%w%p *');										-- test for values that are simple ASCII text and bypass other tests if true
	if capture == v then														-- if same there are no Unicode characters
		return;
	end
	for _, invisible_char in ipairs (cfg.invisible_chars) do
		local char_name = invisible_char1;									-- the character or group name
		local pattern = invisible_char2;										-- the pattern used to find it
		position, _, capture = mw.ustring.find (v, pattern);					-- see if the parameter value contains characters that match the pattern
		
		if position and (cfg.invisible_defs.zwj == capture) then				-- if we found a zero-width joiner character
			if mw.ustring.find (v, cfg.indic_script) then						-- it's ok if one of the Indic scripts
				position = nil;													-- unset position
			elseif cfg.emoji_tmw.ustring.codepoint (v, position+1) then			-- is zwj followed by a character listed in emoji{}?
				position = nil;													-- unset position
			end
		end
		
		if position then
			if 'nowiki' == capture or 'math' == capture or						-- nowiki and math stripmarkers (not an error condition)
				('templatestyles' == capture and utilities.in_array (param, {'id', 'quote'})) then	-- templatestyles stripmarker allowed in these parameters
					stripmarker = true;											-- set a flag
			elseif true == stripmarker and cfg.invisible_defs.del == capture then	-- because stripmakers begin and end with the delete char, assume that we've found one end of a stripmarker
				position = nil;													-- unset
			else
				local err_msg;
				if capture and not (cfg.invisible_defs.del == capture or cfg.invisible_defs.zwj == capture) then
					err_msg = capture .. ' ' .. char_name;
				else
					err_msg = char_name .. ' ' .. 'character';
				end
				utilities.set_message ('err_invisible_char', {err_msg, utilities.wrap_style ('parameter', param), position});	-- add error message
				return;															-- and done with this parameter
			end
		end
	end
end
-------------------------------------------
Argument wrapper.  This function provides support for argument mapping defined
in the configuration file so that multiple names can be transparently aliased to
single internal variable.
local function argument_wrapper ( args )
	local origin = {};
	
	return setmetatable({
		ORIGIN = function ( self, k )
			local dummy = selfk;												-- force the variable to be loaded.
			return origink;
		end
	},
	{
		__index = function ( tbl, k )
			if origink ~= nil then
				return nil;
			end
			
			local args, list, v = args, cfg.aliasesk;
			
			if type( list ) == 'table' then
				v, origink = utilities.select_one ( args, list, 'err_redundant_parameters' );
				if origink == nil then
					origink = ;												-- Empty string, not nil
				end
			elseif list ~= nil then
				v, origink = argslist, list;
			else
				-- maybe let through instead of raising an error?
				-- v, origink = argsk, k;
				error( cfg.messages'unknown_argument_map' .. ': ' .. k);
			end
			
			-- Empty strings, not nil;
			if v == nil then
				v = ;
				origink = ;
			end
			
			tbl = rawset( tbl, k, v );
			return v;
		end,
	});
end
-----------------------------------------------------
When date is YYYY-MM-DD format wrap in nowrap span: YYYY-MM-DD.
When date is DD MMMM YYYY or is MMMM DD, YYYY then wrap in nowrap span:
DD MMMM YYYY or MMMM DD, YYYY
DOES NOT yet support MMMM YYYY or any of the date ranges.
local function nowrap_date (date)
	local cap = ;
	local cap2 = ;
	if date:match("^%d%d%d%d%-%d%d%-%d%d$") then
		date = utilities.substitute (cfg.presentation'nowrap1', date);
	
	elseif date:match("^%a+%s*%d%d?,%s+%d%d%d%d$") or date:match ("^%d%d?%s*%a+%s+%d%d%d%d$") then
		cap, cap2 = string.match (date, "^(.*)%s+(%d%d%d%d)$");
		date = utilities.substitute (cfg.presentation'nowrap2', {cap, cap2});
	end
	
	return date;
end
--type=none).
local function set_titletype (cite_class, title_type)
	if utilities.is_set (title_type) then
		if 'none' == cfg.keywords_xlatetitle_type then
			title_type = ;													-- if |type=none then type parameter not displayed
		end
		return title_type;														-- if |type= has been set to any other value use that value
	end
	return cfg.title_types cite_class or ;									-- set template's default title type; else empty string for concatenation
end
---------------------------------------------------------
Joins a sequence of strings together while checking for duplicate separation characters.
local function safe_join( tbl, duplicate_char )
	local f = {};																-- create a function table appropriate to type of 'duplicate character'
		if 1 == #duplicate_char then											-- for single byte ASCII characters use the string library functions
			f.gsub = string.gsub
			f.match = string.match
			f.sub = string.sub
		else																	-- for multi-byte characters use the ustring library functions
			f.gsub = mw.ustring.gsub
			f.match = mw.ustring.match
			f.sub = mw.ustring.sub
		end
	local str = ;																-- the output string
	local comp = ;															-- what does 'comp' mean?
	local end_chr = ;
	local trim;
	for _, value in ipairs( tbl ) do
		if value == nil then value = ; end
		
		if str ==  then														-- if output string is empty
			str = value;														-- assign value to it (first time through the loop)
		elseif value ~=  then
			if value:sub(1, 1) == '", "" );								-- remove HTML markup (string -> string)
			else
				comp = value;
			end
																				-- typically duplicate_char is sepc
			if f.sub(comp, 1, 1) == duplicate_char then							-- is first character same as duplicate_char? why test first character?
																				--   Because individual string segments often (always?) begin with terminal punct for the
																				--   preceding segment: 'First element' .. 'sepc next element' .. etc.?
				trim = false;
				end_chr = f.sub(str, -1, -1);									-- get the last character of the output string
				-- str = str .. "
						str = f.sub(str, 1, -3);								-- remove them both
					end
				end
				if trim then
					if value ~= comp then 										-- value does not equal comp when value contains HTML markup
						local dup2 = duplicate_char;
						if f.match(dup2, "%A" ) then dup2 = "%" .. dup2; end	-- if duplicate_char not a letter then escape it
						
						value = f.gsub(value, "(%b)" .. dup2, "%1", 1 )		-- remove duplicate_char if it follows HTML markup
					else
						value = f.sub(value, 2, -1 );							-- remove duplicate_char when it is first character
					end
				end
			end
			str = str .. value; 												-- add it to the output string
		end
	end
	return str;
end
---------------------------------------------------------
returns true if suffix is properly formed Jr, Sr, or ordinal in the range 1–9.
Puncutation not allowed.
local function is_suffix (suffix)
	if utilities.in_array (suffix, {'Jr', 'Sr', 'Jnr', 'Snr', '1st', '2nd', '3rd'}) or suffix:match ('^%dth$') then
		return true;
	end
	return false;
end
-----------------------------------------
For Vancouver style, author/editor names are supposed to be rendered in Latin
(read ASCII) characters.  When a name uses characters that contain diacritical
marks, those characters are to be converted to the corresponding Latin
character. When a name is written using a non-Latin alphabet or logogram, that
name is to be transliterated into Latin characters. The module doesn't do this
so editors may/must.
This test allows |first= and |last= names to contain any of the letters defined
in the four Unicode Latin character sets
	 C0 Controls and Basic Latin 0041–005A, 0061–007A
	 C1 Controls and Latin-1 Supplement 00C0–00D6, 00D8–00F6, 00F8–00FF
	 Latin Extended-A 0100–017F
	 Latin Extended-B 0180–01BF, 01C4–024F
lastn= also allowed to contain hyphens, spaces, and apostrophes.
	(http://www.ncbi.nlm.nih.gov/books/NBK7271/box/A35029/)
firstn= also allowed to contain hyphens, spaces, apostrophes, and periods
This original test:
	if nil == mw.ustring.find (last, "^A-Za-zÀ-ÖØ-öø-ƿǄ-ɏ%-%s%'*$")
	or nil == mw.ustring.find (first, "^A-Za-zÀ-ÖØ-öø-ƿǄ-ɏ%-%s%'%.+2-6%a*$") then
was written outside of the code editor and pasted here because the code editor
gets confused between character insertion point and cursor position. The test has
been rewritten to use decimal character escape sequence for the individual bytes
of the Unicode characters so that it is not necessary to use an external editor
to maintain this code.
	\195\128-\195\150 – À-Ö (U+00C0–U+00D6 – C0 controls)
	\195\152-\195\182 – Ø-ö (U+00D8-U+00F6 – C0 controls)
	\195\184-\198\191 – ø-ƿ (U+00F8-U+01BF – C0 controls, Latin extended A & B)
	\199\132-\201\143 – Ǆ-ɏ (U+01C4-U+024F – Latin extended B)
local function is_good_vanc_name (last, first, suffix, position)
	if not suffix then
		if first:find (',%s') then											-- when there is a space or comma, might be first name/initials + generational suffix
			first = first:match ('(.-),%s+');									-- get name/initials
			suffix = first:match (',%s+(.+)$');								-- get generational suffix
		end
	end
	if utilities.is_set (suffix) then
		if not is_suffix (suffix) then
			add_vanc_error (cfg.err_msg_supl.suffix, position);
			return false;														-- not a name with an appropriate suffix
		end
	end
	if nil == mw.ustring.find (last, "^A-Za-z\195\128-\195\150\195\152-\195\182\195\184-\198\191\199\132-\201\143\225\184\128-\225\187\191%-%s%'*$") or
		nil == mw.ustring.find (first, "^A-Za-z\195\128-\195\150\195\152-\195\182\195\184-\198\191\199\132-\201\143\225\184\128-\225\187\191%-%s%'%.*$") then
			add_vanc_error (cfg.err_msg_supl'non-Latin char', position);
			return false;														-- not a string of Latin characters; Vancouver requires Romanization
	end;
	return true;
end
--firstn= may be separated by spaces or hyphens, or for initials, a period.
See http://www.ncbi.nlm.nih.gov/books/NBK7271/box/A35062/.
Vancouver style requires family rank designations (Jr, II, III, etc.) to be rendered
as Jr, 2nd, 3rd, etc.  See http://www.ncbi.nlm.nih.gov/books/NBK7271/box/A35085/.
This code only accepts and understands generational suffix in the Vancouver format
because Roman numerals look like, and can be mistaken for, initials.
This function uses ustring functions because firstname initials may be any of the
Unicode Latin characters accepted by is_good_vanc_name ().
local function reduce_to_initials (first, position)
	if first:find (',', 1, true) then
		return first;															-- commas not allowed; abandon
	end
	local name, suffix = mw.ustring.match (first, "^(%u+) (%dJS%drndth+)$");
	if not name then															-- if not initials and a suffix
		name = mw.ustring.match (first, "^(%u+)$");								-- is it just initials?
	end
	if name then																-- if first is initials with or without suffix
		if 3 > mw.ustring.len (name) then										-- if one or two initials
			if suffix then														-- if there is a suffix
				if is_suffix (suffix) then										-- is it legitimate?
					return first;												-- one or two initials and a valid suffix so nothing to do
				else
					add_vanc_error (cfg.err_msg_supl.suffix, position);			-- one or two initials with invalid suffix so error message
					return first;												-- and return first unmolested
				end
			else
				return first;													-- one or two initials without suffix; nothing to do
			end
		end
	end																			-- if here then name has 3 or more uppercase letters so treat them as a word
	local initials_t, names_t = {}, {};											-- tables to hold name parts and initials
	local i = 1;																-- counter for number of initials
	names_t = mw.text.split (first, '%s%-+');									-- split into a sequence of names and possible suffix
	while names_ti do															-- loop through the sequence
		if 1  i then
			table.insert (initials_t, mw.ustring.sub (names_ti, 1, 1));		-- insert the initial at end of initials sequence
		end
		i = i + 1;																-- bump the counter
	end
			
	return table.concat (initials_t);											-- Vancouver format does not include spaces.
end
--------------------------------------------------------------
extract interwiki prefixen from .  Returns two one or two values:
	false – no prefixen
	nil – prefix exists but not recognized
	project prefix, language prefix – when value has either of:
		:::
		:::
	project prefix, nil – when  has only a known single-letter prefix
	nil, language prefix – when  has only a known language prefix
accepts single-letter project prefixen: 'd' (wikidata), 's' (wikisource), and 'w' (wikipedia) prefixes; at this
writing, the other single-letter prefixen (b (wikibook), c (commons), m (meta), n (wikinews), q (wikiquote), and
v (wikiversity)) are not supported.
local function interwiki_prefixen_get (value, is_link)
	if not value:find (':%l+:') then											-- if no prefix
		return false;															-- abandon; boolean here to distinguish from nil fail returns later
	end
	local prefix_patterns_linked_t = {											-- sequence of valid interwiki and inter project prefixen
		'^%%:(dsw):(%l%l+):',												-- wikilinked; project and language prefixes
		'^%%:(%l%l+):(dsw):',												-- wikilinked; language and project prefixes
		'^%%:(dsw):',														-- wikilinked; project prefix
		'^%%:(%l%l+):',														-- wikilinked; language prefix
		}
		
	local prefix_patterns_unlinked_t = {										-- sequence of valid interwiki and inter project prefixen
		'^:(dsw):(%l%l+):',													-- project and language prefixes
		'^:(%l%l+):(dsw):',													-- language and project prefixes
		'^:(dsw):',															-- project prefix
		'^:(%l%l+):',															-- language prefix
		}
	
	local cap1, cap2;
	for _, pattern in ipairs ((is_link and prefix_patterns_linked_t) or prefix_patterns_unlinked_t) do
		cap1, cap2 = value:match (pattern);
		if cap1 then
			break;																-- found a match so stop looking
		end
	end
	
	if cap1 and cap2 then														-- when both then :project:language: or :language:project: (both forms allowed)
		if 1 == #cap1 then														-- length == 1 then :project:language:
			if cfg.inter_wiki_mapcap2 then									-- is language prefix in the interwiki map?
				return cap1, cap2;												-- return interwiki project and interwiki language
			end
		else																	-- here when :language:project:
			if cfg.inter_wiki_mapcap1 then									-- is language prefix in the interwiki map?
				return cap2, cap1;												-- return interwiki project and interwiki language
			end
		end
		return nil;																-- unknown interwiki language
	elseif not (cap1 or cap2) then												-- both are nil?
		return nil;																-- we got something that looks like a project prefix but isn't; return fail
	elseif 1 == #cap1 then														-- here when one capture
		return cap1, nil;														-- length is 1 so return project, nil language
	else																		-- here when one capture and its length it more than 1
		if cfg.inter_wiki_mapcap1 then										-- is language prefix in the interwiki map?
			return nil, cap1;													-- return nil project, language
		end
	end
end
---mask=0, the associated name is not rendered
local function list_people (control, people, etal)
	local sep;
	local namesep;
	local format = control.format;
	local maximum = control.maximum;
	local name_list = {};
	if 'vanc' == format then													-- Vancouver-like name styling?
		sep = cfg.presentation'sep_nl_vanc';									-- name-list separator between names is a comma
		namesep = cfg.presentation'sep_name_vanc';							-- last/first separator is a space
	else
		sep = cfg.presentation'sep_nl';										-- name-list separator between names is a semicolon
		namesep = cfg.presentation'sep_name';									-- last/first separator is 
	end
	
	if sep:sub (-1, -1) ~= " " then sep = sep .. " " end
	if utilities.is_set (maximum) and maximum  maximum then
				etal = true;
				break;
			end
			
			if mask then
				local n = tonumber (mask);										-- convert to a number if it can be converted; nil else
				if n then
					one = 0 ~= n and string.rep("—", n) or nil;			-- make a string of (n > 0) mdashes, nil else, to replace name
					person.link = nil;											-- don't create link to name if name is replaces with mdash string or has been set nil
				else
					one = mask;													-- replace name with mask text (must include name-list separator)
					sep_one = " ";												-- modify name-list separator
				end
			else
				one = person.last;												-- get surname
				local first = person.first										-- get given name
				if utilities.is_set (first) then
					if ("vanc" == format) then									-- if Vancouver format
						one = one:gsub ('%.', );								-- remove periods from surnames (http://www.ncbi.nlm.nih.gov/books/NBK7271/box/A35029/)
						if not person.corporate and is_good_vanc_name (one, first, nil, i) then		-- and name is all Latin characters; corporate authors not tested
							first = reduce_to_initials (first, i);				-- attempt to convert first name(s) to initials
						end
					end
					one = one .. namesep .. first;
				end
			end
			if utilities.is_set (person.link) then
				one = utilities.make_wikilink (person.link, one);				-- link author/editor
			end
			if one then															-- if  has a value (name, mdash replacement, or mask text replacement)
				local proj, tag = interwiki_prefixen_get (one, true);			-- get the interwiki prefixen if present
				if 'w' == proj and ('Wikipedia' == mw.site.namespaces.Project'name') then
					proj = nil;													-- for stuff like :w:de:, :w is unnecessary TODO: maint cat?
				end
				if proj then
					local proj_name = ({'d' = 'Wikidata', 's' = 'Wikisource', 'w' = 'Wikipedia'})proj;	-- :w (wikipedia) for linking from a non-wikipedia project
					if proj_name then 
						one = one .. utilities.wrap_style ('interproj', proj_name);	-- add resized leading space, brackets, static text, language name
						utilities.add_prop_cat ('interproj-linked-name', proj);	-- categorize it;  is sort key
						tag = nil;												-- unset; don't do both project and language
					end
				end
				if tag == cfg.this_wiki_code then
					tag = nil;													-- stuff like :en: at en.wiki is pointless TODO: maint cat?
				end
				if tag then
					local lang = cfg.lang_tag_remaptag or cfg.mw_languages_by_tag_ttag;
					if lang then												-- error messaging done in extract_names() where we know parameter names
						lang = mw.ustring.gsub(lang, "^Ttiếng ", "", 1);
						one = one .. utilities.wrap_style ('interwiki', lang);	-- add resized leading space, brackets, static text, language name
						utilities.add_prop_cat ('interwiki-linked-name', tag);	-- categorize it;  is sort key
					end
				end
				table.insert (name_list, one);									-- add it to the list of names
				table.insert (name_list, sep_one);								-- add the proper name-list separator
			end
		end
	end
	local count = #name_list / 2;												-- (number of names + number of separators) divided by 2
	if 0 -----------------------
Generates a CITEREF anchor ID if we have at least one name or a date.  Otherwise
returns an empty string.
namelist is one of the contributor-, author-, or editor-name lists chosen in that
order.  year is Year or anchor_year.
local function make_citeref_id (namelist, year)
	local names={};							-- a table for the one to four names and year
	for i,v in ipairs (namelist) do			-- loop through the list and take up to the first four last names
		namesi = v.last
		if i == 4 then break end			-- if four then done
	end
	table.insert (names, year);				-- add the year at the end
	local id = table.concat(names);			-- concatenate names and year for CITEREF id
	if utilities.is_set (id) then			-- if concatenation is not an empty string
		return "CITEREF" .. id;				-- add the CITEREF portion
	else
		return ;							-- return an empty string; no reason to include CITEREF id in this citation
	end
end
--mode= parameter
local function cite_class_attribute_make (cite_class, mode)
	local class_t = {};
	table.insert (class_t, 'citation');											-- required for blue highlight
	if 'citation' ~= cite_class then
		table.insert (class_t, cite_class);										-- identify this template for user css
		table.insert (class_t, utilities.is_set (mode) and mode or 'cs1');		-- identify the citation style for user css or javascript
	else
		table.insert (class_t, utilities.is_set (mode) and mode or 'cs2');		-- identify the citation style for user css or javascript
	end
	for _, prop_key in ipairs (z.prop_keys_t) do
		table.insert (class_t, prop_key);										-- identify various properties for user css or javascript
	end
	return table.concat (class_t, ' ');											-- make a big string and done
end
--display-=etal parameter
local function name_has_etal (name, etal, nocat, param)
	if utilities.is_set (name) then												-- name can be nil in which case just return
		local patterns = cfg.et_al_patterns; 									-- get patterns from configuration
		
		for _, pattern in ipairs (patterns) do									-- loop through all of the patterns
			if name:match (pattern) then										-- if this 'et al' pattern is found in name
				name = name:gsub (pattern, );									-- remove the offending text
				etal = true;													-- set flag (may have been set previously here or by |display-=etal)
				if not nocat then												-- no categorization for |vauthors=
					utilities.set_message ('err_etal', {param});				-- and set an error if not added
				end
			end
		end
	end
	return name, etal;
end
---------------------------------------------
Add an error message and category when  parameter value does not contain letters.  
Add a maintenance category when  parameter value has numeric characters mixed with characters that are 
not numeric characters; could be letters and/or punctuation characters.
This function will only emit one error and one maint message for the current template.  Does not emit both error
and maint messages/categories for the same parameter value.
returns nothing
local function name_is_numeric (name, name_alias, list_name)
	local patterns = {
		'^%D+%d',																--  must have digits preceded by other characters
		'^%D*%d+%D+',															--  must have digits followed by other characters
		}
	if not added_numeric_name_errs and mw.ustring.match (name, '^%A+$') then	-- if we have not already set an error message and  does not have any alpha characters
		utilities.set_message ('err_numeric_names', name_alias);				-- add an error message
		added_numeric_name_errs = true;											-- set the flag so we emit only one error message
		return;																	-- when here no point in further testing; abandon
	end
	if not added_numeric_name_maint then										-- if we have already set a maint message
		for _, pattern in ipairs (patterns) do									-- spin through list of patterns
			if mw.ustring.match (name, pattern) then							-- digits preceded or followed by anything but digits; %D+ includes punctuation
				utilities.set_message ('maint_numeric_names', cfg.special_case_translation list_name);	-- add a maint cat for this template
				added_numeric_name_maint = true;								-- set the flag so we emit only one maint message
				return;															-- when here no point in further testing; abandon
			end
		end
	end
end
-------------------------------------
Evaluates the content of last/surname (authors etc.) parameters for multiple names.
Multiple names are indicated if there is more than one comma or any "unescaped"
semicolons. Escaped semicolons are ones used as part of selected HTML entities.
If the condition is met, the function adds the multiple name maintenance category.
Same test for first except that commas should not appear in given names (MOS:JR says
that the generational suffix does not take a separator character).  Titles, degrees,
postnominals, affiliations, all normally comma separated don't belong in a citation.
– name parameter value
– AuthorList, EditorList, etc
– number of allowed commas; 1 (default) for surnames; 0 for given names
returns nothing
local function name_has_mult_names (name, list_name, limit)
	local _, commas, semicolons, nbsps;
	limit = limit and limit or 1;
	if utilities.is_set (name) then
		_, commas = name:gsub (',', );										-- count the number of commas
		_, semicolons = name:gsub (';', );									-- count the number of semicolons
		-- nbsps probably should be its own separate count rather than merged in
		-- some way with semicolons because Lua patterns do not support the
		-- grouping operator that regex does, which means there is no way to add
		-- more entities to escape except by adding more counts with the new
		-- entities
		_, nbsps = name:gsub (' ',);										-- count nbsps
		
		-- There is exactly 1 semicolon per   entity, so subtract nbsps
		-- from semicolons to 'escape' them. If additional entities are added,
		-- they also can be subtracted.
		if limit ----------------------------------------------------------
Compares values assigned to various parameters according to the string provided as  in the function call.
can have on of two values:
	'generic_names' – for name-holding parameters: |last=, |first=, |editor-last=, etc
	'generic_titles' – for |title=
There are two types of generic tests.  The 'accept' tests look for a pattern that should not be rejected by the
'reject' test.  For example,
	|author=Smith, John
would be rejected by the 'author' reject test.  But piped wikilinks with 'author' disambiguation should not be
rejected so the 'accept' test prevents that from happening.  Accept tests are always performed before reject
tests.
Each of the 'accept' and 'reject' sequence tables hold tables for en.wiki ('en') and local.wiki ('local')
that each can hold a test sequence table  The sequence table holds, at index 1, a test pattern, and, at index
2, a boolean control value.  The control value tells string.find() or mw.ustring.find() to do plain-text search (true)
or a pattern search (false).  The intent of all this complexity is to make these searches as fast as possible so
that we don't run out of processing time on very large articles.
Returns
	true when a reject test finds the pattern or string
	false when an accept test finds the pattern or string
	nil else
**
local function is_generic (item, value, wiki)
	local test_val;
	local str_lower = {															-- use string.lower() for en.wiki ('en') and use mw.ustring.lower() or local.wiki ('local')
		'en' = string.lower,
		'local' = mw.ustring.lower,
		}
	local str_find = {															-- use string.find() for en.wiki ('en') and use mw.ustring.find() or local.wiki ('local')
		'en' = string.find,
		'local' = mw.ustring.find,
		}
	local function test (val, test_t, wiki)										-- local function to do the testing;  selects lower() and find() functions
		val = test_t2 and str_lowerwiki(value) or val;						-- when  set to 'true', plaintext search using lowercase value
		return str_findwiki (val, test_t1, 1, test_t2);					-- return nil when not found or matched
	end
		
	local test_types_t = {'accept', 'reject'};									-- test accept patterns first, then reject patterns
	local wikis_t = {'en', 'local'};											-- do tests for each of these keys; en.wiki first, local.wiki second
	for _, test_type in ipairs (test_types_t) do								-- for each test type
		for _, generic_value in pairs (cfg.special_case_translationitemtest_type) do	-- spin through the list of generic value fragments to accept or reject
			for _, wiki in ipairs (wikis_t) do
				if generic_valuewiki then
					if test (value, generic_valuewiki, wiki) then				-- go do the test
						return ('reject' == test_type);							-- param value rejected, return true; false else
					end
				end
			end
		end
	end
end
----------------------------------------------------------------------------
calls is_generic() to determine if  is a 'generic name' listed in cfg.generic_names;  is the
parameter name used in error messaging
local function name_is_generic (name, name_alias)
	if not added_generic_name_errs  and is_generic ('generic_names', name) then
		utilities.set_message ('err_generic_name', name_alias);					-- set an error message
		added_generic_name_errs = true;
	end
end
------------------------------------------------------------------------------------
This function calls various name checking functions used to validate the content of the various name-holding parameters.
local function name_checks (last, first, list_name, last_alias, first_alias)
	local accept_name;
	if utilities.is_set (last) then
		last, accept_name = utilities.has_accept_as_written (last);				-- remove accept-this-as-written markup when it wraps all of 
		if not accept_name then													--  not wrapped in accept-as-written markup
			name_has_mult_names (last, list_name);								-- check for multiple names in the parameter
			name_is_numeric (last, last_alias, list_name);						-- check for names that have no letters or are a mix of digits and other characters
			name_is_generic (last, last_alias);									-- check for names found in the generic names list
		end
	end
	if utilities.is_set (first) then
		first, accept_name = utilities.has_accept_as_written (first);			-- remove accept-this-as-written markup when it wraps all of 
		if not accept_name then													--  not wrapped in accept-as-written markup
			name_has_mult_names (first, list_name, 0);							-- check for multiple names in the parameter; 0 is number of allowed commas in a given name
			name_is_numeric (first, first_alias, list_name);					-- check for names that have no letters or are a mix of digits and other characters
			name_is_generic (first, first_alias);								-- check for names found in the generic names list
		end
		local wl_type, D = utilities.is_wikilink (first);
		if 0 ~= wl_type then
			first = D;
			utilities.set_message ('err_bad_paramlink', first_alias);
		end
	end
	return last, first;															-- done
end
--firstn=.
When an author or editor parameter contains some form of 'et al.', the 'et al.'
is stripped from the parameter and a flag (etal) returned that will cause list_people()
to add the static 'et al.' text from Module:Citation/CS1/Configuration.  This keeps
'et al.' out of the template's metadata.  When this occurs, an error is emitted.
local function extract_names(args, list_name)
	local names = {};															-- table of names
	local last;																	-- individual name components
	local first;
	local link;
	local mask;
	local i = 1;																-- loop counter/indexer
	local n = 1;																-- output table indexer
	local count = 0;															-- used to count the number of times we haven't found a |last= (or alias for authors, |editor-last or alias for editors)
	local etal = false;															-- return value set to true when we find some form of et al. in an author parameter
	local last_alias, first_alias, link_alias;									-- selected parameter aliases used in error messaging
	while true do
		last, last_alias = utilities.select_one ( args, cfg.aliaseslist_name .. '-Last', 'err_redundant_parameters', i );		-- search through args for name components beginning at 1
		first, first_alias = utilities.select_one ( args, cfg.aliaseslist_name .. '-First', 'err_redundant_parameters', i );
		link, link_alias = utilities.select_one ( args, cfg.aliaseslist_name .. '-Link', 'err_redundant_parameters', i );
		mask = utilities.select_one ( args, cfg.aliaseslist_name .. '-Mask', 'err_redundant_parameters', i );
	
		if last then															-- error check |lastn= alias for unknown interwiki link prefix; done here because this is where we have the parameter name
			local project, language = interwiki_prefixen_get (last, true);		-- true because we expect interwiki links in |lastn= to be wikilinked
			if nil == project and nil == language then							-- when both are nil
				utilities.set_message ('err_bad_paramlink', last_alias);		-- not known, emit an error message	-- TODO: err_bad_interwiki?
				last = utilities.remove_wiki_link (last);						-- remove wikilink markup; show display value only
			end
		end
		
		if link then															-- error check |linkn= alias for unknown interwiki link prefix
			local project, language = interwiki_prefixen_get (link, false);		-- false because wiki links in |author-linkn= is an error
			if nil == project and nil == language then							-- when both are nil
				utilities.set_message ('err_bad_paramlink', link_alias);		-- not known, emit an error message	-- TODO: err_bad_interwiki?
				link = nil;														-- unset so we don't link
				link_alias = nil;
			end
		end
		
		last, etal = name_has_etal (last, etal, false, last_alias);				-- find and remove variations on et al.
		first, etal = name_has_etal (first, etal, false, first_alias);			-- find and remove variations on et al.
		last, first = name_checks (last, first, list_name, last_alias, first_alias);						-- multiple names, extraneous annotation, etc. checks
		if first and not last then												-- if there is a firstn without a matching lastn
			local alias = first_alias:find ('given', 1, true) and 'given' or 'first';	-- get first or given form of the alias
			utilities.set_message ('err_first_missing_last', {
				first_alias,													-- param name of alias missing its mate
				first_alias:gsub (alias, {'first' = 'last', 'given' = 'surname'}),	-- make param name appropriate to the alias form
				});																-- add this error message
		elseif not first and not last then										-- if both firstn and lastn aren't found, are we done?
			count = count + 1;													-- number of times we haven't found last and first
			if 2 ------------------------------------------------------
attempt to decode |language= and return language name and matching tag; nil else.
This function looks for:
	 as a tag in cfg.lang_tag_remap{}
	 as a name in cfg.lang_name_remap{}
	
	 as a name in cfg.mw_languages_by_name_t
	 as a tag in cfg.mw_languages_by_tag_t
when those fail, presume that  is an IETF-like tag that MediaWiki does not recognize.  Strip all
script, region, variant, whatever subtags from  to leave just a two or three character language tag
and look for the new  in cfg.mw_languages_by_tag_t{}
on success, returns name (in properly capitalized form) and matching tag (in lowercase); on failure returns nil
local function name_tag_get (lang_param)
	local lang_param_lc = mw.ustring.lower (lang_param);						-- use lowercase as an index into the various tables
	local name;
	local tag;
	name = cfg.lang_tag_remaplang_param_lc;									-- assume  is a tag; attempt to get remapped language name 
	if name then																-- when ,  is a tag for a remapped language name
		if cfg.lang_name_remapname:lower()2 ~= lang_param_lc then
			utilities.set_message ('maint_unknown_lang');						-- add maint category if not already added
			return name, cfg.lang_name_remapname:lower()2;					-- so return name and tag from lang_name_remapname; special case to xlate sr-ec and sr-el to sr-cyrl and sr-latn
		end
		return name, lang_param_lc;												-- so return  from remap and 
	end
	tag = lang_param_lc:match ('^(%a%a%a?)%-.*');								-- still assuming that  is a tag; strip script, region, variant subtags
	name = cfg.lang_tag_remaptag;												-- attempt to get remapped language name with language subtag only
	if name then																-- when ,  is a tag for a remapped language name
		return name, tag;														-- so return  from remap and 
	end
	if cfg.lang_name_remaplang_param_lc then									-- not a remapped tag, assume  is a name; attempt to get remapped language tag 
		return cfg.lang_name_remaplang_param_lc1, cfg.lang_name_remaplang_param_lc2;	-- for this , return a (possibly) new name and appropriate tag
	end
	name = cfg.mw_languages_by_tag_tlang_param_lc;							-- assume that  is a tag; attempt to get its matching language name
	
	if name then
		return name, lang_param_lc;												--  is a tag so return it and 
	end
	
	tag = cfg.mw_languages_by_name_tlang_param_lc;							-- assume that  is a language name; attempt to get its matching tag
	
	if tag then
		return cfg.mw_languages_by_tag_ttag, tag;								--  is a name so return the name from the table and 
	end
	tag = lang_param_lc:match ('^(%a%a%a?)%-.*');								-- is  an IETF-like tag that MediaWiki doesn't recognize?  gets the language subtag; nil else
	if tag then
		name = cfg.mw_languages_by_tag_ttag;									-- attempt to get a language name using the shortened 
		if name then
			return name, tag;													--  is an unrecognized IETF-like tag so return  and language subtag
		end
	end
end
--language=nb, French, th
where the language names or codes are separated from each other by commas with
optional space characters.
local function language_parameter (lang)
	local tag;																	-- some form of IETF-like language tag; language subtag with optional region, sript, vatiant, etc subtags
	local lang_subtag;															-- ve populates |language= with mostly unecessary region subtags the MediaWiki does not recognize; this is the base language subtag
	local name;																	-- the language name
	local language_list = {};													-- table of language names to be rendered
	local names_t = {};															-- table made from the value assigned to |language=
	local this_wiki_name = mw.language.fetchLanguageName (cfg.this_wiki_code, cfg.this_wiki_code);	-- get this wiki's language name
	names_t = mw.text.split (lang, '%s*,%s*');									-- names should be a comma separated list
	for _, lang in ipairs (names_t) do											-- reuse lang here because we don't yet know if lang is a language name or a language tag
		name, tag = name_tag_get (lang);										-- attempt to get name/tag pair for ;  has proper capitalization;  is lowercase
		if utilities.is_set (tag) then
			lang_subtag = tag:gsub ('^(%a%a%a?)%-.*', '%1');					-- for categorization, strip any IETF-like tags from language tag
			name = mw.ustring.gsub(name, "^Ttiếng ", "", 1)
			if cfg.this_wiki_code ~= lang_subtag then							-- when the language is not the same as this wiki's language
				if 2 == lang_subtag:len() then									-- and is a two-character tag
					utilities.add_prop_cat ('foreign-lang-source', {name, tag}, lang_subtag);		-- categorize it; tag appended to allow for multiple language categorization
				else															-- or is a recognized language (but has a three-character tag)
					utilities.add_prop_cat ('foreign-lang-source-2', {lang_subtag}, lang_subtag);			-- categorize it differently TODO: support multiple three-character tag categories per cs1|2 template?
				end
			elseif cfg.local_lang_cat_enable then								-- when the language and this wiki's language are the same and categorization is enabled
				utilities.add_prop_cat ('local-lang-source', {name, lang_subtag});		-- categorize it
			end
		else
			name = lang;														-- return whatever  has so that we show something
			utilities.set_message ('maint_unknown_lang');						-- add maint category if not already added
		end
		
		table.insert (language_list, name);
		name = ;																-- so we can reuse it
	end

	name = utilities.make_sep_list (#language_list, language_list);
	if (1 == #language_list) and (lang_subtag == cfg.this_wiki_code) then		-- when only one language, find lang name in this wiki lang name; for |language=en-us, 'English' in 'American English'
		return ;																-- if one language and that language is this wiki's return an empty string (no annotation)
	end
	return (" " .. wrap_msg ('language', name));								-- otherwise wrap with '(in ...)'
	-- TODO: should only return blank or name rather than full list
	so we can clean up the bunched parenthetical elements Language, Type, Format
	
end
---------------------------------------------------
Gets the default CS style configuration for the given mode.
Returns default separator and either postscript as passed in or the default.
In CS1, the default postscript and separator are '.'.
In CS2, the default postscript is the empty string and the default separator is ','.
local function set_cs_style (postscript, mode)
	if utilities.is_set(postscript) then
		-- emit a maintenance message if user postscript is the default cs1 postscript
		-- we catch the opposite case for cs2 in set_style
		if mode == 'cs1' and postscript == cfg.presentation'ps_' .. mode then
			utilities.set_message ('maint_postscript');
		end
	else
		postscript = cfg.presentation'ps_' .. mode;
	end
	return cfg.presentation'sep_' .. mode, postscript;
end
--mode= first and the
#invoke CitationClass second. Removes the postscript if postscript == none.
local function set_style (mode, postscript, cite_class)
	local sep;
	if 'cs2' == mode then
		sep, postscript = set_cs_style (postscript, 'cs2');
	elseif 'cs1' == mode then
		sep, postscript = set_cs_style (postscript, 'cs1');
	elseif 'citation' == cite_class	then
		sep, postscript = set_cs_style (postscript, 'cs2');
	else
		sep, postscript = set_cs_style (postscript, 'cs1');
	end
	if cfg.keywords_xlatepostscript:lower() == 'none' then
		-- emit a maintenance message if user postscript is the default cs2 postscript
		-- we catch the opposite case for cs1 in set_cs_style
		if 'cs2' == mode or ('cs1' ~= mode and 'citation' == cite_class) then	-- postscript=none should not emit maint message
			utilities.set_message ('maint_postscript');
		end
		postscript = ;
	end
	
	return sep, postscript
end
--=------------------------------------------------------------
Determines if a URL has the file extension that is one of the PDF file extensions
used by MediaWiki:Common.css when applying the PDF icon to external links.
returns true if file extension is one of the recognized extensions, else false
**
local function is_pdf (url)
	return url:match ('%.pdf$') or url:match ('%.PDF$') or
		url:match ('%.pdf%?#') or url:match ('%.PDF%?#') or
		url:match ('%.PDF&#035') or url:match ('%.pdf&#035');
end
--chapter-format=, etc.  Also emits an error message
if the format parameter does not have a matching URL parameter.  If the format parameter
is not set and the URL contains a file extension that is recognized as a PDF document
by MediaWiki's commons.css, this code will set the format parameter to (PDF) with
the appropriate styling.
local function style_format (format, url, fmt_param, url_param)
	if utilities.is_set (format) then
		format = utilities.wrap_style ('format', format);						-- add leading space, parentheses, resize
		if not utilities.is_set (url) then
			utilities.set_message ('err_format_missing_url', {fmt_param, url_param});	-- add an error message
		end
	elseif is_pdf (url) then													-- format is not set so if URL is a PDF file then
		format = utilities.wrap_style ('format', 'PDF');						-- set format to PDF
	else
		format = ;															-- empty string for concatenation
	end
	return format;
end
-----------------------------------------
Returns a number that defines the number of names displayed for author and editor
name lists and a Boolean flag to indicate when et al. should be appended to the name list.
When the value assigned to |display-xxxxors= is a number greater than or equal to zero,
return the number and the previous state of the 'etal' flag (false by default
but may have been set to true if the name list contains some variant of the text 'et al.').
When the value assigned to |display-xxxxors= is the keyword 'etal', return a number
that is one greater than the number of authors in the list and set the 'etal' flag true.
This will cause the list_people() to display all of the names in the name list followed by 'et al.'
In all other cases, returns nil and the previous state of the 'etal' flag.
inputs:
	max: A'DisplayAuthors' or A'DisplayEditors', etc; a number or some flavor of etal
	count: #a or #e
	list_name: 'authors' or 'editors'
	etal: author_etal or editor_etal
This function sets an error message when |display-xxxxors= value greater than or equal to number of names but
not when  comes from  global settings.  When using global settings,  is set to the
keyword 'cs1 config' which is used to supress the normal error.  Error is suppressed because it is to be expected
that some citations in an article will have the same or fewer names that the limit specified in .
local function get_display_names (max, count, list_name, etal, param)
	if utilities.is_set (max) then
		if 'etal' == max:lower():gsub(" '%.", ) then						-- the :gsub() portion makes 'etal' from a variety of 'et al.' spellings and stylings
			max = count + 1;													-- number of authors + 1 so display all author name plus et al.
			etal = true;														-- overrides value set by extract_names()
		elseif max:match ('^%d+$') then											-- if is a string of numbers
			max = tonumber (max);												-- make it a number
			if (max >= count) and ('cs1 config' ~= param) then					-- error when local |display-xxxxors= value greater than or equal to number of names; not an error when using global setting
				utilities.set_message ('err_disp_name', {param, max});			-- add error message
				max = nil;
			end
		else																	-- not a valid keyword or number
			utilities.set_message ('err_disp_name', {param, max});				-- add error message
			max = nil;															-- unset; as if |display-xxxxors= had not been set
		end
	end
	
	return max, etal;
end
---------------------------
Adds error if |page=, |pages=, |quote-page=, |quote-pages= has what appears to be
some form of p. or pp. abbreviation in the first characters of the parameter content.
check page for extraneous p, p., pp, pp., pg, pg. at start of parameter value:
	good pattern: '^P^%.P%l' matches when page begins PX or P# but not Px
		      where x and X are letters and # is a digit
	bad pattern:  '^PpPpGg' matches when page begins pp, pP, Pp, PP, pg, pG, Pg, PG
local function extra_text_in_page_check (val, name)
	if not val:match (cfg.vol_iss_pg_patterns.good_ppattern) then
		for _, pattern in ipairs (cfg.vol_iss_pg_patterns.bad_ppatterns) do		-- spin through the selected sequence table of patterns
			if val:match (pattern) then											-- when a match, error so
				utilities.set_message ('err_extra_text_pages', name);	 		-- add error message
				return;															-- and done
			end
		end
	end		
end
--issue=
sets error message on failure; returns nothing
local function extra_text_in_vol_iss_check (val, name, selector)
	if not utilities.is_set (val) then
		return;
	end
	
	local handler = 'v' == selector and 'err_extra_text_volume' or 'err_extra_text_issue';
	val = val:lower();															-- force parameter value to lower case
	for _, pattern in ipairs (cfg.vol_iss_pg_patterns.vi_patterns_t) do			-- spin through the sequence table of patterns
		if val:match (pattern) then												-- when a match, error so
			utilities.set_message (handler, name);								-- add error message
			return;																-- and done
		end
	end
end
--=-----------------------------------------------------------------------
split apart a |vauthors= or |veditors= parameter.  This function allows for corporate names, wrapped in doubled
parentheses to also have commas; in the old version of the code, the doubled parentheses were included in the
rendered citation and in the metadata.  Individual author names may be wikilinked
	|vauthors=Jones AB, White EB, ((Black, Brown, and Co.))
**
local function get_v_name_table (vparam, output_table, output_link_table)
	local _, accept = utilities.has_accept_as_written (vparam);
	if accept then
		utilities.add_prop_cat ('vanc-accept');									-- add properties category
	end
	local name_table = mw.text.split(vparam, "%s*,%s*");						-- names are separated by commas
	local wl_type, label, link;													-- wl_type not used here; just a placeholder
	
	local i = 1;
	
	while name_tablei do
		if name_tablei:match ('^%(%(.*^%)^%)$') then						-- first segment of corporate with one or more commas; this segment has the opening doubled parentheses
			local name = name_tablei;
			i = i + 1;															-- bump indexer to next segment
			while name_tablei do
				name = name .. ', ' .. name_tablei;							-- concatenate with previous segments
				if name_tablei:match ('^.*%)%)$') then						-- if this table member has the closing doubled parentheses
					break;														-- and done reassembling so
				end
				i = i + 1;														-- bump indexer
			end
			table.insert (output_table, name);									-- and add corporate name to the output table
			table.insert (output_link_table, );								-- no wikilink
		else
			wl_type, label, link = utilities.is_wikilink (name_tablei);		-- wl_type is: 0, no wl (text in label variable); 1, D; 2, D
			table.insert (output_table, label);									-- add this name
			if 1 == wl_type then
				table.insert (output_link_table, label);						-- simple wikilink D
			else
				table.insert (output_link_table, link);							-- no wikilink or D; add this link if there is one, else empty string
			end
		end
		i = i + 1;
	end	
	return output_table;
end
--veditors= must be in Vancouver system style. Corporate or institutional names
may sometimes be required and because such names will often fail the is_good_vanc_name() and other format compliance
tests, are wrapped in doubled parentheses ((corporate name)) to suppress the format tests.
Supports generational suffixes Jr, 2nd, 3rd, 4th–6th.
This function sets the Vancouver error when a required comma is missing and when there is a space between an author's initials.
local function parse_vauthors_veditors (args, vparam, list_name)
	local names = {};															-- table of names assembled from |vauthors=, |author-maskn=, |author-linkn=
	local v_name_table = {};
	local v_link_table = {};													-- when name is wikilinked, targets go in this table
	local etal = false;															-- return value set to true when we find some form of et al. vauthors parameter
	local last, first, link, mask, suffix;
	local corporate = false;
	vparam, etal = name_has_etal (vparam, etal, true);							-- find and remove variations on et al. do not categorize (do it here because et al. might have a period)
	v_name_table = get_v_name_table (vparam, v_name_table, v_link_table);		-- names are separated by commas
	for i, v_name in ipairs(v_name_table) do
		first = ;																-- set to empty string for concatenation and because it may have been set for previous author/editor
		local accept_name;
		v_name, accept_name = utilities.has_accept_as_written (v_name);			-- remove accept-this-as-written markup when it wraps all of 
		if accept_name then
			last = v_name;
			corporate = true;													-- flag used in list_people()
		elseif string.find(v_name, "%s") then
			if v_name:find(';%.') then										-- look for commonly occurring punctuation characters; 
				add_vanc_error (cfg.err_msg_supl.punctuation, i);
			end
			local lastfirstTable = {}
			lastfirstTable = mw.text.split(v_name, "%s+")
			first = table.remove(lastfirstTable);								-- removes and returns value of last element in table which should be initials or generational suffix
			if not mw.ustring.match (first, '^%u+$') then						-- mw.ustring here so that later we will catch non-Latin characters
				suffix = first;													-- not initials so assume that whatever we got is a generational suffix
				first = table.remove(lastfirstTable);							-- get what should be the initials from the table
			end
			last = table.concat(lastfirstTable, ' ')							-- returns a string that is the concatenation of all other names that are not initials and generational suffix
			if not utilities.is_set (last) then
				first = ;														-- unset
				last = v_name;													-- last empty because something wrong with first
				add_vanc_error (cfg.err_msg_supl.name, i);
			end
			if mw.ustring.match (last, '%a+%s+%u+%s+%a+') then
				add_vanc_error (cfg.err_msg_supl'missing comma', i);			-- matches last II last; the case when a comma is missing
			end
			if mw.ustring.match (v_name, ' %u %u$') then						-- this test is in the wrong place TODO: move or replace with a more appropriate test
				add_vanc_error (cfg.err_msg_supl.initials, i);					-- matches a space between two initials
			end
		else
			last = v_name;														-- last name or single corporate name?  Doesn't support multiword corporate names? do we need this?
		end
		
		if utilities.is_set (first) then
			if not mw.ustring.match (first, "^%u?%u$") then						-- first shall contain one or two upper-case letters, nothing else
				add_vanc_error (cfg.err_msg_supl.initials, i);					-- too many initials; mixed case initials (which may be ok Romanization); hyphenated initials
			end
			is_good_vanc_name (last, first, suffix, i);							-- check first and last before restoring the suffix which may have a non-Latin digit
			if utilities.is_set (suffix) then
				first = first .. ' ' .. suffix;									-- if there was a suffix concatenate with the initials
				suffix = ;													-- unset so we don't add this suffix to all subsequent names
			end
		else
			if not corporate then
				is_good_vanc_name (last, , nil, i);
			end
		end
		link = utilities.select_one ( args, cfg.aliaseslist_name .. '-Link', 'err_redundant_parameters', i ) or v_link_tablei;
		mask = utilities.select_one ( args, cfg.aliaseslist_name .. '-Mask', 'err_redundant_parameters', i );
		namesi = {last = last, first = first, link = link, mask = mask, corporate = corporate};		-- add this assembled name to our names list
	end
	return names, etal;															-- all done, return our list of names
end
--xxxxor2= (and all of their aliases); stops after the second
test which mimicks the test used in extract_names() when looking for a hole in the author name list.  There may be a better
way to do this, I just haven't discovered what that way is.
Emits an error message when more than one xxxxor name source is provided.
In this function, vxxxxors = vauthors or veditors; xxxxors = authors as appropriate.
local function select_author_editor_source (vxxxxors, xxxxors, args, list_name)
	local lastfirst = false;
	if utilities.select_one ( args, cfg.aliaseslist_name .. '-Last', 'none', 1 ) or		-- do this twice in case we have a |first1= without a |last1=; this ...
		utilities.select_one ( args, cfg.aliaseslist_name .. '-First', 'none', 1 ) or		-- ... also catches the case where |first= is used with |vauthors=
		utilities.select_one ( args, cfg.aliaseslist_name .. '-Last', 'none', 2 ) or
		utilities.select_one ( args, cfg.aliaseslist_name .. '-First', 'none', 2 ) then
			lastfirst = true;
	end
	if (utilities.is_set (vxxxxors) and true == lastfirst) or					-- these are the three error conditions
		(utilities.is_set (vxxxxors) and utilities.is_set (xxxxors)) or
		(true == lastfirst and utilities.is_set (xxxxors)) then
			local err_name;
			if 'AuthorList' == list_name then									-- figure out which name should be used in error message
				err_name = 'author';
			else
				err_name = 'editor';
			end
			utilities.set_message ('err_redundant_parameters', err_name .. '-name-list parameters');	-- add error message
	end
	if true == lastfirst then return 1 end;										-- return a number indicating which author name source to use
	if utilities.is_set (vxxxxors) then return 2 end;
	if utilities.is_set (xxxxors) then return 3 end;
	return 1;																	-- no authors so return 1; this allows missing author name test to run in case there is a first without last 
end
----------------------------------------------------------
This function is used to validate a parameter's assigned value for those parameters that have only a limited number
of allowable values (yes, y, true, live, dead, etc.).  When the parameter value has not been assigned a value (missing
or empty in the source template) the function returns the value specified by ret_val.  If the parameter value is one
of the list of allowed values returns the translated value; else, emits an error message and returns the value
specified by ret_val.
TODO: explain 
local function is_valid_parameter_value (value, name, possible, ret_val, invert)
	if not utilities.is_set (value) then
		return ret_val;															-- an empty parameter is ok
	end
	if (not invert and utilities.in_array (value, possible)) then				-- normal;  is in  table
		return cfg.keywords_xlatevalue;										-- return translation of parameter keyword
	elseif invert and not utilities.in_array (value, possible) then				-- invert;  is not in  table
		return value;															-- return  as it is
	else
		utilities.set_message ('err_invalid_param_val', {name, value});			-- not an allowed value so add error message
		return ret_val;
	end
end
--------------------------------------------------------------------
This function terminates a name list (author, contributor, editor) with a separator character (sepc) and a space
when the last character is not a sepc character or when the last three characters are not sepc followed by two
closing square brackets (close of a wikilink).  When either of these is true, the name_list is terminated with a
single space character.
local function terminate_name_list (name_list, sepc)
	if (string.sub (name_list, -3, -1) == sepc .. '. ') then					-- if already properly terminated
		return name_list;														-- just return the name list
	elseif (string.sub (name_list, -1, -1) == sepc) or (string.sub (name_list, -3, -1) == sepc .. ) then	-- if last name in list ends with sepc char
		return name_list .. " ";												-- don't add another
	else
		return name_list .. sepc .. ' ';										-- otherwise terminate the name list
	end
end
--------------------------------------------------------------------
returns the concatenation of the formatted volume and issue (or journal article number) parameters as a single
string; or formatted volume or formatted issue, or an empty string if neither are set.
	
local function format_volume_issue (volume, issue, article, cite_class, origin, sepc, lower)
	if not utilities.is_set (volume) and not utilities.is_set (issue) and not utilities.is_set (article) then
		return ;
	end
	-- same condition as in format_pages_sheets()
	local is_journal = 'journal' == cite_class or (utilities.in_array (cite_class, {'citation', 'map', 'interview'}) and 'journal' == origin);
	local is_numeric_vol = volume and (volume:match ('^MDCLXVI+$') or volume:match ('^%d+$'));	-- is only uppercase roman numerals or only digits?
	local is_long_vol = volume and (4 -----------------------------------------
adds static text to one of |page(s)= or |sheet(s)= values and returns it with all of the others set to empty strings.
The return order is:
	page, pages, sheet, sheets
Singular has priority over plural when both are provided.
local function format_pages_sheets (page, pages, sheet, sheets, cite_class, origin, sepc, nopp, lower)
	if 'map' == cite_class then													-- only cite map supports sheet(s) as in-source locators
		if utilities.is_set (sheet) then
			if 'journal' == origin then
				return , , wrap_msg ('j-sheet', sheet, lower), ;
			else
				return , , wrap_msg ('sheet', {sepc, sheet}, lower), ;
			end
		elseif utilities.is_set (sheets) then
			if 'journal' == origin then
				return , , , wrap_msg ('j-sheets', sheets, lower);
			else
				return , , , wrap_msg ('sheets', {sepc, sheets}, lower);
			end
		end
	end
	local is_journal = 'journal' == cite_class or (utilities.in_array (cite_class, {'citation', 'map', 'interview'}) and 'journal' == origin);
	
	if utilities.is_set (page) then
		if is_journal then
			return utilities.substitute (cfg.messages'j-page(s)', page), , , ;
		elseif not nopp then
			return utilities.substitute (cfg.messages'p-prefix', {sepc, page}), , , ;
		else
			return utilities.substitute (cfg.messages'nopp', {sepc, page}), , , ;
		end
	elseif utilities.is_set (pages) then
		if is_journal then
			return utilities.substitute (cfg.messages'j-page(s)', pages), , , ;
		elseif tonumber(pages) ~= nil and not nopp then							-- if pages is only digits, assume a single page number
			return , utilities.substitute (cfg.messages'p-prefix', {sepc, pages}), , ;
		elseif not nopp then
			return , utilities.substitute (cfg.messages'pp-prefix', {sepc, pages}), , ;
		else
			return , utilities.substitute (cfg.messages'nopp', {sepc, pages}), , ;
		end
	end
	
	return , , , ;														-- return empty strings
end
--------------------------------------------------------------------------
returns one of the in-source locators: page, pages, or at. 
If any of these are interwiki links to Wikisource, returns the label portion of the interwiki-link as plain text
for use in COinS.  This COinS thing is done because here we convert an interwiki-link to an external link and
add an icon span around that; get_coins_pages() doesn't know about the span.  TODO: should it?  
TODO: add support for sheet and sheets?; streamline;
TODO: make it so that this function returns only one of the three as the single in-source (the return value assigned
to a new name)?
local function insource_loc_get (page, page_orig, pages, pages_orig, at)
	local ws_url, ws_label, coins_pages, L;										-- for Wikisource interwiki-links; TODO: this corrupts page metadata (span remains in place after cleanup; fix there?)
	if utilities.is_set (page) then
		if utilities.is_set (pages) or utilities.is_set (at) then
			pages = ;															-- unset the others
			at = ;
		end
		extra_text_in_page_check (page, page_orig);								-- emit error message when |page= value begins with what looks like p., pp., etc.
		ws_url, ws_label, L = wikisource_url_make (page);						-- make ws URL from |page= interwiki link; link portion L becomes tooltip label
		if ws_url then
			page = external_link (ws_url, ws_label .. ' ', 'ws link in page');	-- space char after label to move icon away from in-source text; TODO: a better way to do this?
			page = utilities.substitute (cfg.presentation'interwiki-icon', {cfg.presentation'class-wikisource', L, page});
			coins_pages = ws_label;
		end
	elseif utilities.is_set (pages) then
		if utilities.is_set (at) then
			at = ;															-- unset
		end
		extra_text_in_page_check (pages, pages_orig);							-- emit error message when |page= value begins with what looks like p., pp., etc.
		ws_url, ws_label, L = wikisource_url_make (pages);						-- make ws URL from |pages= interwiki link; link portion L becomes tooltip label
		if ws_url then
			pages = external_link (ws_url, ws_label .. ' ', 'ws link in pages');	-- space char after label to move icon away from in-source text; TODO: a better way to do this?
			pages = utilities.substitute (cfg.presentation'interwiki-icon', {cfg.presentation'class-wikisource', L, pages});
			coins_pages = ws_label;
		end
	elseif utilities.is_set (at) then
		ws_url, ws_label, L = wikisource_url_make (at);							-- make ws URL from |at= interwiki link; link portion L becomes tooltip label
		if ws_url then
			at = external_link (ws_url, ws_label .. ' ', 'ws link in at');	-- space char after label to move icon away from in-source text; TODO: a better way to do this?
			at = utilities.substitute (cfg.presentation'interwiki-icon', {cfg.presentation'class-wikisource', L, at});
			coins_pages = ws_label;
		end
	end
	
	return page, pages, at, coins_pages;
end
--url= or chapter-url= (or alias...) value
local function is_unique_archive_url (archive, url, c_url, source, date)
	if utilities.is_set (archive) then
		if archive == url or archive == c_url then
			utilities.set_message ('err_bad_url', {utilities.wrap_style ('parameter', source)});	-- add error message
			return , ;														-- unset |archive-url= and |archive-date= because same as |url= or |chapter-url=
		end
	end
	return archive, date;
end
--=---------------------------------------------------------------------
Check archive.org URLs to make sure they at least look like they are pointing at valid archives and not to the 
save snapshot URL or to calendar pages.  When the archive URL is 'https://web.archive.org/save/' (or http://...)
archive.org saves a snapshot of the target page in the URL.  That is something that Wikipedia should not allow
unwitting readers to do.
When the archive.org URL does not have a complete timestamp, archive.org chooses a snapshot according to its own
algorithm or provides a calendar 'search' result.  WP:ELNO discourages links to search results.
This function looks at the value assigned to |archive-url= and returns empty strings for |archive-url= and
archive-date= and an error message when:
	|archive-url= holds an archive.org save command URL
	|archive-url= is an archive.org URL that does not have a complete timestamp (YYYYMMDDhhmmss 14 digits) in the
		correct place
otherwise returns |archive-url= and |archive-date=
There are two mostly compatible archive.org URLs:
	//web.archive.org/...		-- the old form
	//web.archive.org/web/...	-- the new form
The old form does not support or map to the new form when it contains a display flag.  There are four identified flags
('id_', 'js_', 'cs_', 'im_') but since archive.org ignores others following the same form (two letters and an underscore)
we don't check for these specific flags but we do check the form.
This function supports a preview mode.  When the article is rendered in preview mode, this function may return a modified
archive URL:
	for save command errors, return undated wildcard (/*/)
	for timestamp errors when the timestamp has a wildcard, return the URL unmodified
	for timestamp errors when the timestamp does not have a wildcard, return with timestamp limited to six digits plus wildcard (/yyyymm*/)
A secondary function is to return an archive-url timestamp from those urls that have them (archive.org and
archive.today).  The timestamp is used by validation.archive_date_check() to see if the value in |archive-date=
matches the timestamp in the archive url.
**
local function archive_url_check (url, date)
	local err_msg = ;															-- start with the error message empty
	local path, timestamp, flag;												-- portions of the archive.org URL
	
	timestamp = url:match ('//archive.today/(%d%d%d%d%d%d%d%d%d%d%d%d%d%d)/') or	-- get timestamp from archive.today urls
		url:match ('//archive.today/(%d%d%d%d%.%d%d%.%d%d%-%d%d%d%d%d%d)/');		-- this timestamp needs cleanup
	if timestamp then															-- if this was an archive.today url ...
		return url, date, timestamp:gsub ('%.%-', );						-- return ArchiveURL, ArchiveDate, and timestamp (dots and dashes removed) from |archive-url=, and done
	end
																				-- here for archive.org urls
	if (not url:match('//web%.archive%.org/')) and (not url:match('//liveweb%.archive%.org/')) then		-- also deprecated liveweb Wayback machine URL
		return url, date;														-- not an archive.org archive, return ArchiveURL and ArchiveDate
	end
	if url:match('//web%.archive%.org/save/') then								-- if a save command URL, we don't want to allow saving of the target page 
		err_msg = cfg.err_msg_supl.save;
		url = url:gsub ('(//web%.archive%.org)/save/', '%1/*/', 1);				-- for preview mode: modify ArchiveURL
	elseif url:match('//liveweb%.archive%.org/') then
		err_msg = cfg.err_msg_supl.liveweb;
	else
		path, timestamp, flag = url:match('//web%.archive%.org/(^%d*)(%d+)(^/*)/');	-- split out some of the URL parts for evaluation
		if not path then														-- malformed in some way; pattern did not match
			err_msg = cfg.err_msg_supl.timestamp;
		elseif 14 ~= timestamp:len() then										-- path and flag optional, must have 14-digit timestamp here
			err_msg = cfg.err_msg_supl.timestamp;
			if '*' ~= flag then
				local replacement = timestamp:match ('^%d%d%d%d%d%d') or timestamp:match ('^%d%d%d%d');	-- get the first 6 (YYYYMM) or first 4 digits (YYYY)
				if replacement then												-- nil if there aren't at least 4 digits (year)
					replacement = replacement .. string.rep ('0', 14 - replacement:len());	-- year or yearmo (4 or 6 digits) zero-fill to make 14-digit timestamp
					url=url:gsub ('(//web%.archive%.org/^%d*)%d^/*', '%1' .. replacement .. '*', 1)	-- for preview, modify ts to 14 digits plus splat for calendar display
				end
			end
		elseif utilities.is_set (path) and 'web/' ~= path then					-- older archive URLs do not have the extra 'web/' path element
			err_msg = cfg.err_msg_supl.path;
		elseif utilities.is_set (flag) and not utilities.is_set (path) then		-- flag not allowed with the old form URL (without the 'web/' path element)
			err_msg = cfg.err_msg_supl.flag;
		elseif utilities.is_set (flag) and not flag:match ('%a%a_') then		-- flag if present must be two alpha characters and underscore (requires 'web/' path element)
			err_msg = cfg.err_msg_supl.flag;
		else
			return url, date, timestamp;										-- return ArchiveURL, ArchiveDate, and timestamp from |archive-url=
		end
	end
																				-- if here, something not right so
	utilities.set_message ('err_archive_url', {err_msg});						-- add error message and
	if is_preview_mode then
		return url, date, timestamp;											-- preview mode so return ArchiveURL, ArchiveDate, and timestamp from |archive-url=
	else
		return , ;															-- return empty strings for ArchiveURL and ArchiveDate
	end
end
--at= are supposed to do that)
returns the original parameter value without modification; added maint cat when parameter value contains digits
local function place_check (param_val)
	if not utilities.is_set (param_val) then									-- parameter empty or omitted
		return param_val;														-- return that empty state
	end
	
	if mw.ustring.find (param_val, '%d') then									-- not empty, are there digits in the parameter value
		utilities.set_message ('maint_location');								-- yep, add maint cat
	end
	
	return param_val;															-- and done
end
--title= to 'Archived copy' (placeholder added by bots that can't find proper title); if matches, return true; nil else
local function is_archived_copy (title)
	title = mw.ustring.lower(title);											-- switch title to lower case
	if title:find (cfg.special_case_translation.archived_copy.en) then			-- if title is 'Archived copy'
		return true;
	elseif cfg.special_case_translation.archived_copy'local' then
		if mw.ustring.find (title, cfg.special_case_translation.archived_copy'local') then	-- mw.ustring() because might not be Latin script
			return true;
		end
	end
end
--display-= parameter value
The purpose of this function is to prevent categorizing a template that has fewer names than the global setting
to keep the etal annotation specified by .
local function display_names_select (global_display_names, local_display_names, param_name, number_of_names, test)
	if global_display_names and utilities.is_set (local_display_names) then		-- when both
		if 'etal' == local_display_names:lower():gsub(" '%.", ) then		-- the :gsub() portion makes 'etal' from a variety of 'et al.' spellings and stylings
			number_of_names = tonumber (number_of_names);						-- convert these to numbers for comparison
			local global_display_names_num = tonumber (global_display_names);	--  not set when parameter value is not digits
			if number_of_names > global_display_names_num then					-- template has more names than global config allows to be displayed?
				utilities.set_message ('maint_overridden_setting');				-- set a maint message because global is overriding local |display-=etal
				return global_display_names, 'cs1 config';						-- return global with spoof parameter name (for get_display_names())
			else
				return local_display_names, param_name;							-- return local because fewer names so let  control
			end
		end
																				-- here when  and  both numbers;  controls
		utilities.set_message ('maint_overridden_setting');						-- set a maint message
		return global_display_names, 'cs1 config';								-- return global with spoof parameter name (for get_display_names())
	end
																				-- here when only one of  or  set
	if global_display_names then
		return global_display_names, 'cs1 config';								-- return global with spoof parameter name (for get_display_names())
	else
		return local_display_names, param_name;									-- return local
	end
end
--mode= parameter value.  When both are present, emit maintenance message
local function mode_set (Mode, Mode_origin)
	local mode;
	if cfg.global_cs1_config_t'Mode' then										-- global setting in ; nil when empty or assigned value invalid
		mode = is_valid_parameter_value (cfg.global_cs1_config_t'Mode', 'cs1 config: mode', cfg.keywords_lists'mode', );	-- error messaging 'param' here is a hoax
	else
		mode = is_valid_parameter_value (Mode, Mode_origin, cfg.keywords_lists'mode', );
	end
	if cfg.global_cs1_config_t'Mode' and utilities.is_set (Mode) then			-- when template has |mode= which global setting has overridden
		utilities.set_message ('maint_overridden_setting');						-- set a maint message
	end
	return mode;
end
--quote-pages= are unset to nil so that they are not included in the template's metadata
local function quote_make (quote, trans_quote, script_quote, quote_page, quote_pages, nopp, sepc, postscript)
	if utilities.is_set (quote) or utilities.is_set (trans_quote) or utilities.is_set (script_quote) then
		if utilities.is_set (quote) then
			if quote:sub(1, 1) == '"' and quote:sub(-1, -1) == '"' then			-- if first and last characters of quote are quote marks
				quote = quote:sub(2, -2);										-- strip them off
			end
		end
		
		quote = kern_quotes (quote);											-- kern if needed
		quote = utilities.wrap_style ('quoted-text', quote );					-- wrap in ... tags
	
		if utilities.is_set (script_quote) then
			quote = script_concatenate (quote, script_quote, 'script-quote');	--  tags, lang attribute, categorization, etc.; must be done after quote is wrapped
		end
		if utilities.is_set (trans_quote) then
			if trans_quote:sub(1, 1) == '"' and trans_quote:sub(-1, -1) == '"' then -- if first and last characters of |trans-quote are quote marks
				trans_quote = trans_quote:sub(2, -2); -- strip them off
			end
			quote = quote .. " " .. utilities.wrap_style ('trans-quoted-title', trans_quote );
		end
		if utilities.is_set (quote_page) or utilities.is_set (quote_pages) then	-- add page prefix
			local quote_prefix = ;
			if utilities.is_set (quote_page) then
				extra_text_in_page_check (quote_page, 'quote-page');			-- add to maint cat if |quote-page= value begins with what looks like p., pp., etc.
				if not nopp then
					quote_prefix = utilities.substitute (cfg.messages'p-prefix', {sepc, quote_page}), , , ;
				else
					quote_prefix = utilities.substitute (cfg.messages'nopp', {sepc, quote_page}), , , ;
				end
			elseif utilities.is_set (quote_pages) then
				extra_text_in_page_check (quote_pages, 'quote-pages');			-- add to maint cat if |quote-pages= value begins with what looks like p., pp., etc.
				if tonumber(quote_pages) ~= nil and not nopp then				-- if only digits, assume single page
					quote_prefix = utilities.substitute (cfg.messages'p-prefix', {sepc, quote_pages}), , ;
				elseif not nopp then
					quote_prefix = utilities.substitute (cfg.messages'pp-prefix', {sepc, quote_pages}), , ;
				else
					quote_prefix = utilities.substitute (cfg.messages'nopp', {sepc, quote_pages}), , ;
				end
			end

			quote = quote_prefix .. ": " .. quote;
		else
			quote = sepc .. " " .. quote;
		end
		postscript = "";														-- cs1|2 does not supply terminal punctuation when |quote= is set
	
	elseif utilities.is_set (quote_page) or utilities.is_set (quote_pages) then
		quote_page = nil;														-- unset; these require |quote=; TODO: error message?
		quote_pages = nil;
	end
	return quote, quote_page, quote_pages, postscript;
end
--institution=
local function check_publisher_name (publisher)
	local patterns_t = {
		'^%w%s+%s*:%s*%w%s+$',												-- plain text : 
		'^%++%+%s*:%s*%w%s+$',										-- partially wikilinked : 
		'^%w%s+%s*:%s*%++%+$',										-- partially wikilinked : 
		'^%++%+%s*:%s*%++%+$',								-- wikilinked : 
		}
	
	for _, pattern in ipairs (patterns_t) do									-- spin through the patterns_t sequence
		if mw.ustring.match (publisher, pattern) then							-- does this pattern match?
			utilities.set_message ('maint_publisher_location');					-- set a maint message
			return;																-- and done
		end
	end
end
----------------------------------------------------------------------------------------
This is the main function doing the majority of the citation formatting.
local function citation0( config, args )
	-- 
	Load Input Parameters
	The argument_wrapper facilitates the mapping of multiple aliases to single internal variable.
	
	local A = argument_wrapper ( args );
	local i 
	-- Pick out the relevant fields from the arguments.  Different citation templates
	-- define different field names for the same underlying things.	
	local author_etal;
	local a	= {};																-- authors list from |lastn= / |firstn= pairs or |vauthors=
	local Authors;
	local NameListStyle;
		if cfg.global_cs1_config_t'NameListStyle' then						-- global setting in  overrides local |name-list-style= parameter value; nil when empty or assigned value invalid
			NameListStyle = is_valid_parameter_value (cfg.global_cs1_config_t'NameListStyle', 'cs1 config: name-list-style', cfg.keywords_lists'name-list-style', );	-- error messaging 'param' here is a hoax
		else
			NameListStyle = is_valid_parameter_value (A'NameListStyle', A:ORIGIN('NameListStyle'), cfg.keywords_lists'name-list-style', );
		end
		if cfg.global_cs1_config_t'NameListStyle' and utilities.is_set (A'NameListStyle') then	-- when template has |name-list-style= which global setting has overridden
			utilities.set_message ('maint_overridden_setting');					-- set a maint message
		end
	local Collaboration = A'Collaboration';
	do																			-- to limit scope of selected
		local selected = select_author_editor_source (A'Vauthors', A'Authors', args, 'AuthorList');
		if 1 == selected then
			a, author_etal = extract_names (args, 'AuthorList');				-- fetch author list from |authorn= / |lastn= / |firstn=, |author-linkn=, and |author-maskn=
		elseif 2 == selected then
			NameListStyle = 'vanc';												-- override whatever |name-list-style= might be
			a, author_etal = parse_vauthors_veditors (args, A'Vauthors', 'AuthorList');	-- fetch author list from |vauthors=, |author-linkn=, and |author-maskn=
		elseif 3 == selected then
			Authors = A'Authors';												-- use content of |people= or |credits=; |authors= is deprecated; TODO: constrain |people= and |credits= to cite av media, episode, serial?
		end
		if utilities.is_set (Collaboration) then
			author_etal = true;													-- so that |display-authors=etal not required
		end
	end
	local editor_etal;
	local e	= {};																-- editors list from |editor-lastn= / |editor-firstn= pairs or |veditors=
	do																			-- to limit scope of selected
		local selected = select_author_editor_source (A'Veditors', nil, args, 'EditorList');	-- support for |editors= withdrawn
		if 1 == selected then
			e, editor_etal = extract_names (args, 'EditorList');				-- fetch editor list from |editorn= / |editor-lastn= / |editor-firstn=, |editor-linkn=, and |editor-maskn=
		elseif 2 == selected then
			NameListStyle = 'vanc';												-- override whatever |name-list-style= might be
			e, editor_etal = parse_vauthors_veditors (args, args.veditors, 'EditorList');	-- fetch editor list from |veditors=, |editor-linkn=, and |editor-maskn=
		end
	end
							
	local Chapter = A'Chapter';												-- done here so that we have access to |contribution= from |chapter= aliases
	local Chapter_origin = A:ORIGIN ('Chapter');
	local Contribution;															-- because contribution is required for contributor(s)
		if 'contribution' == Chapter_origin then
			Contribution = Chapter;												-- get the name of the contribution
		end
	local c = {};																-- contributors list from |contributor-lastn= / contributor-firstn= pairs
	
	if utilities.in_array (config.CitationClass, {"book", "citation"}) and not utilities.is_set (A'Periodical') then	-- |contributor= and |contribution= only supported in book cites
		c = extract_names (args, 'ContributorList');							-- fetch contributor list from |contributorn= / |contributor-lastn=, -firstn=, -linkn=, -maskn=
		
		if 0  0 then PublicationDate = vi_formatdate(PublicationDate, true) end
	else
		Date_origin = A:ORIGIN('Date');											-- not a promotion; name required for error messaging
	end
	if PublicationDate == Date then PublicationDate = ; end					-- if PublicationDate is same as Date, don't display in rendered citation
	if Date and #Date > 0 then Date = vi_formatdate(Date, true) end
	--
	Go test all of the date-holding parameters for valid MOS:DATE format and make sure that dates are real dates. This must be done before we do COinS because here is where
	we get the date used in the metadata.
	
	Date validation supporting code is in Module:Citation/CS1/Date_validation
	
	local DF = is_valid_parameter_value (A'DF', A:ORIGIN('DF'), cfg.keywords_lists'df', );
	if not utilities.is_set (DF) then
		DF = cfg.global_df;														-- local |df= if present overrides global df set by  template
	end
	local ArchiveURL;
	local ArchiveDate;
	local ArchiveFormat = A'ArchiveFormat';
	local archive_url_timestamp;												-- timestamp from wayback machine url
	
	ArchiveURL, ArchiveDate, archive_url_timestamp = archive_url_check (A'ArchiveURL', A'ArchiveDate')
	ArchiveFormat = style_format (ArchiveFormat, ArchiveURL, 'archive-format', 'archive-url');
	
	ArchiveURL, ArchiveDate = is_unique_archive_url (ArchiveURL, URL, ChapterURL, A:ORIGIN('ArchiveURL'), ArchiveDate);		-- add error message when URL or ChapterURL == ArchiveURL
	local AccessDate = A'AccessDate';
	local COinS_date = {};														-- holds date info extracted from |date= for the COinS metadata by Module:Date verification
	local DoiBroken = A'DoiBroken';
	local Embargo = A'Embargo';
	local anchor_year;															-- used in the CITEREF identifier
	do	-- create defined block to contain local variables error_message, date_parameters_list, mismatch
		local error_message = ;
																				-- AirDate has been promoted to Date so not necessary to check it
		local date_parameters_list = {
			'access-date' = {val = AccessDate, name = A:ORIGIN ('AccessDate')},
			'archive-date' = {val = ArchiveDate, name = A:ORIGIN ('ArchiveDate')},
			'date' = {val = Date, name = Date_origin},
			'doi-broken-date' = {val = DoiBroken, name = A:ORIGIN ('DoiBroken')},
			'pmc-embargo-date' = {val = Embargo, name = A:ORIGIN ('Embargo')},
			'publication-date' = {val = PublicationDate, name = A:ORIGIN ('PublicationDate')},
			'year' = {val = Year, name = A:ORIGIN ('Year')},
			};
		local error_list = {};
		anchor_year, Embargo = validation.dates(date_parameters_list, COinS_date, error_list);
		if utilities.is_set (Year) and utilities.is_set (Date) then				-- both |date= and |year= not normally needed; 
			validation.year_date_check (Year, A:ORIGIN ('Year'), Date, A:ORIGIN ('Date'), error_list);
		end
		if 0 == #error_list then												-- error free dates only; 0 when error_list is empty
			local modified = false;												-- flag
			
			if utilities.is_set (DF) then										-- if we need to reformat dates
				modified = validation.reformat_dates (date_parameters_list, DF);	-- reformat to DF format, use long month names if appropriate
			end
			if true == validation.date_hyphen_to_dash (date_parameters_list) then	-- convert hyphens to dashes where appropriate
				modified = true;
				utilities.set_message ('maint_date_format');					-- hyphens were converted so add maint category
			end
			
	-- for those wikis that can and want to have English date names translated to the local language; not supported at en.wiki
			if cfg.date_name_auto_xlate_enable and validation.date_name_xlate (date_parameters_list, cfg.date_digit_auto_xlate_enable ) then
				utilities.set_message ('maint_date_auto_xlated');				-- add maint cat
				modified = true;
			end
			if modified then													-- if the date_parameters_list values were modified
				AccessDate = date_parameters_list'access-date'.val;			-- overwrite date holding parameters with modified values
				ArchiveDate = date_parameters_list'archive-date'.val;
				Date = date_parameters_list'date'.val;
				DoiBroken = date_parameters_list'doi-broken-date'.val;
				PublicationDate = date_parameters_list'publication-date'.val;
			end
			if archive_url_timestamp and utilities.is_set (ArchiveDate) then
				validation.archive_date_check (ArchiveDate, archive_url_timestamp, DF);	-- does YYYYMMDD in archive_url_timestamp match date in ArchiveDate
			end
		else
			utilities.set_message ('err_bad_date', {utilities.make_sep_list (#error_list, error_list)});	-- add this error message
		end
	end	-- end of do
	if utilities.in_array (config.CitationClass, {'book', 'encyclopaedia'}) or	-- , ; TODO:  and others?
		('citation' == config.CitationClass and utilities.is_set (Encyclopedia)) or			--  as an encylopedia citation
		('citation' == config.CitationClass and not utilities.is_set (Periodical)) then		--  as a book citation
			if utilities.is_set (PublicationPlace) then
				if not utilities.is_set (PublisherName) then
					local date = COinS_date.rftdate and tonumber (COinS_date.rftdate:match ('%d%d%d%d'));	-- get year portion of COinS date (because in Arabic numerals); convert string to number
					if date and (1850 ) for automated parsing of citation information.
	-- handle the oddity that is cite encyclopedia and encyclopedia=something. Here we presume that
	-- when Periodical, Title, and Chapter are all set, then Periodical is the book (encyclopedia) title, Title
	-- is the article title, and Chapter is a section within the article.  So, we remap 
	
	local coins_chapter = Chapter;												-- default assuming that remapping not required
	local coins_title = Title;													-- et tu
	if 'encyclopaedia' == config.CitationClass or ('citation' == config.CitationClass and utilities.is_set (Encyclopedia)) then
		if utilities.is_set (Chapter) and utilities.is_set (Title) and utilities.is_set (Periodical) then		-- if all are used then
			coins_chapter = Title;												-- remap
			coins_title = Periodical;
		end
	end
	local coins_author = a;														-- default for coins rft.au 
	if 0 
	if accept_title and ( == Title) then										-- only support forced empty for now "(())"
		Title = cfg.messages'notitle';										-- replace by predefined "No title" message
			-- TODO: utilities.set_message ( 'err_redundant_parameters', ...);	-- issue proper error message instead of muting	 
			ScriptTitle = ;													-- just mute for now	 
			TransTitle = ;													-- just mute for now
		plain_title = true;														-- suppress text decoration for descriptive title
		utilities.set_message ('maint_untitled');								-- add maint cat
	end
	if not accept_title then													--  not wrapped in accept-as-written markup
		if '...' == Title:sub (-3) then											-- if ellipsis is the last three characters of |title=
			Title = Title:gsub ('(%.%.%.)%.+$', '%1');							-- limit the number of dots to three
		elseif not mw.ustring.find (Title, '%.%s*%a%.$') and					-- end of title is not a 'dot-(optional space-)letter-dot' initialism ...
			not mw.ustring.find (Title, '%s+%a%.$') then						-- ...and not a 'space-letter-dot' initial (Allium canadense L.)
				Title = mw.ustring.gsub(Title, '%' .. sepc .. '$', );			-- remove any trailing separator character; sepc and ms.ustring() here for languages that use multibyte separator characters
		end
		if utilities.is_set (ArchiveURL) and is_archived_copy (Title) then
			utilities.set_message ('maint_archived_copy');						-- add maintenance category before we modify the content of Title
		end
		if is_generic ('generic_titles', Title) then
			utilities.set_message ('err_generic_title');						-- set an error message
		end
	end
	if (not plain_title) and (utilities.in_array (config.CitationClass, {'web', 'news', 'journal', 'magazine', 'document', 'pressrelease', 'podcast', 'newsgroup', 'mailinglist', 'interview', 'arxiv', 'biorxiv', 'citeseerx', 'medrxiv', 'ssrn'}) or
		('citation' == config.CitationClass and (utilities.is_set (Periodical) or utilities.is_set (ScriptPeriodical)) and not utilities.is_set (Encyclopedia)) or
		('map' == config.CitationClass and (utilities.is_set (Periodical) or utilities.is_set (ScriptPeriodical)))) then		-- special case for cite map when the map is in a periodical treat as an article
			Title = kern_quotes (Title);										-- if necessary, separate title's leading and trailing quote marks from module provided quote marks
			Title = utilities.wrap_style ('quoted-title', Title);
			Title = script_concatenate (Title, ScriptTitle, 'script-title');	--  tags, lang attribute, categorization, etc.; must be done after title is wrapped
			TransTitle = utilities.wrap_style ('trans-quoted-title', TransTitle );
	elseif plain_title or ('report' == config.CitationClass) then				-- no styling for cite report and descriptive titles (otherwise same as above)
		Title = script_concatenate (Title, ScriptTitle, 'script-title');		--  tags, lang attribute, categorization, etc.; must be done after title is wrapped
		TransTitle = utilities.wrap_style ('trans-quoted-title', TransTitle );	-- for cite report, use this form for trans-title
	else
		Title = utilities.wrap_style ('italic-title', Title);
		Title = script_concatenate (Title, ScriptTitle, 'script-title');		--  tags, lang attribute, categorization, etc.; must be done after title is wrapped
		TransTitle = utilities.wrap_style ('trans-italic-title', TransTitle);
	end
	if utilities.is_set (TransTitle) then
		if utilities.is_set (Title) then
			TransTitle = " " .. TransTitle;
		else
			utilities.set_message ('err_trans_missing_title', {'title'});
		end
	end
	if utilities.is_set (Title) then											-- TODO: is this the right place to be making Wikisource URLs?
		if utilities.is_set (TitleLink) and utilities.is_set (URL) then
			utilities.set_message ('err_wikilink_in_url');						-- set an error message because we can't have both
			TitleLink = ;														-- unset
		end
	
		if not utilities.is_set (TitleLink) and utilities.is_set (URL) then
			Title = external_link (URL, Title, URL_origin, UrlAccess) .. TransTitle .. Format;
			URL = ;															-- unset these because no longer needed
			Format = "";
		elseif utilities.is_set (TitleLink) and not utilities.is_set (URL) then
			local ws_url;
			ws_url = wikisource_url_make (TitleLink);							-- ignore ws_label return; not used here
			if ws_url then
				Title = external_link (ws_url, Title .. ' ', 'ws link in title-link');	-- space char after Title to move icon away from italic text; TODO: a better way to do this?
				Title = utilities.substitute (cfg.presentation'interwiki-icon', {cfg.presentation'class-wikisource', TitleLink, Title});				
				Title = Title .. TransTitle;
			else
				Title = utilities.make_wikilink (TitleLink, Title) .. TransTitle;
			end
		else
			local ws_url, ws_label, L;											-- Title has italic or quote markup by the time we get here which causes is_wikilink() to return 0 (not a wikilink)
			ws_url, ws_label, L = wikisource_url_make (Title:gsub('^\'"*(.-)\'"*$', '%1'));	-- make ws URL from |title= interwiki link (strip italic or quote markup); link portion L becomes tooltip label
			if ws_url then
				Title = Title:gsub ('%b', ws_label);							-- replace interwiki link with ws_label to retain markup
				Title = external_link (ws_url, Title .. ' ', 'ws link in title');	-- space char after Title to move icon away from italic text; TODO: a better way to do this?
				Title = utilities.substitute (cfg.presentation'interwiki-icon', {cfg.presentation'class-wikisource', L, Title});				
				Title = Title .. TransTitle;
			else
				Title = Title .. TransTitle;
			end
		end
	else
		Title = TransTitle;
	end
	if utilities.is_set (Place) then
		Place = " " .. wrap_msg ('written', Place, use_lowercase) .. sepc .. " ";
	end
	local ConferenceURL_origin = A:ORIGIN('ConferenceURL');						-- get name of parameter that holds ConferenceURL
	if utilities.is_set (Conference) then
		if utilities.is_set (ConferenceURL) then
			Conference = external_link( ConferenceURL, Conference, ConferenceURL_origin, nil );
		end
		Conference = sepc .. " " .. Conference .. ConferenceFormat;
	elseif utilities.is_set (ConferenceURL) then
		Conference = sepc .. " " .. external_link( ConferenceURL, nil, ConferenceURL_origin, nil );
	end
	local Position = ;
	if not utilities.is_set (Position) then
		local Minutes = A'Minutes';
		local Time = A'Time';
		if utilities.is_set (Minutes) then
			if utilities.is_set (Time) then		--TODO: make a function for this and similar?
				utilities.set_message ('err_redundant_parameters', {utilities.wrap_style ('parameter', 'minutes') .. cfg.presentation'sep_list_pair' .. utilities.wrap_style ('parameter', 'time')});
			end
			Position = " " .. Minutes .. " " .. cfg.messages'minutes';
		else
			if utilities.is_set (Time) then
				local TimeCaption = A'TimeCaption'
				if not utilities.is_set (TimeCaption) then
					TimeCaption = cfg.messages'event';
					if sepc ~= '.' then
						TimeCaption = TimeCaption:lower();
					end
				end
				Position = " " .. TimeCaption .. " " .. Time;
			end
		end
	else
		Position = " " .. Position;
		At = ;
	end
	Page, Pages, Sheet, Sheets = format_pages_sheets (Page, Pages, Sheet, Sheets, config.CitationClass, Periodical_origin, sepc, NoPP, use_lowercase);
	At = utilities.is_set (At) and (sepc .. " " .. At) or "";
	Position = utilities.is_set (Position) and (sepc .. " " .. Position) or "";
	if config.CitationClass == 'map' then
		local Sections = A'Sections';											-- Section (singular) is an alias of Chapter so set earlier
		local Inset = A'Inset';
		
		if utilities.is_set ( Inset ) then
			Inset = sepc .. " " .. wrap_msg ('inset', Inset, use_lowercase);
		end			
		if utilities.is_set ( Sections ) then
			Section = sepc .. " " .. wrap_msg ('sections', Sections, use_lowercase);
		elseif utilities.is_set ( Section ) then
			Section = sepc .. " " .. wrap_msg ('section', Section, use_lowercase);
		end
		At = At .. Inset .. Section;		
	end	
	local Others = A'Others';
	if utilities.is_set (Others) and 0 == #a and 0 == #e then					-- add maint cat when |others= has value and used without |author=, |editor=
		if config.CitationClass == "AV-media-notes"
		or config.CitationClass == "audio-visual" then							-- special maint for AV/M which has a lot of 'false' positives right now
			utilities.set_message ('maint_others_avm')
		else
			utilities.set_message ('maint_others');
		end
	end
	Others = utilities.is_set (Others) and (sepc .. " " .. Others) or "";
	
	if utilities.is_set (Translators) then
		Others = safe_join ({sepc .. ' ', wrap_msg ('translated', Translators, use_lowercase), Others}, sepc);
	end
	if utilities.is_set (Interviewers) then
		Others = safe_join ({sepc .. ' ', wrap_msg ('interview', Interviewers, use_lowercase), Others}, sepc);
	end
	
	local TitleNote = A'TitleNote';
	TitleNote = utilities.is_set (TitleNote) and (sepc .. " " .. TitleNote) or "";
	if utilities.is_set (Edition) then
		if Edition:match ('%f%aEed%n?%.?$') or Edition:match ('%f%aEedition$') then -- Ed, ed, Ed., ed., Edn, edn, Edn., edn.
			utilities.set_message ('err_extra_text_edition');					 -- add error message
		end
		Edition = " " .. wrap_msg ('edition', vi_formatedition(Edition));
	else
		Edition = ;
	end
	Series = utilities.is_set (Series) and wrap_msg ('series', {sepc, Series}) or "";	-- not the same as SeriesNum
	local Agency = A'Agency' or ;											-- |agency= is supported by , , , , and certain  templates
	if utilities.is_set (Agency) then											-- this testing done here because  supports 'news' citations
		if utilities.in_array (config.CitationClass, {'magazine', 'news', 'pressrelease', 'web'}) or ('citation' == config.CitationClass and utilities.in_array (Periodical_origin, {"magazine", "newspaper", "work"})) then
			Agency = wrap_msg ('agency', {sepc, Agency});						-- format for rendering
		else
			Agency = ;														-- unset; not supported
			utilities.set_message ('err_parameter_ignored', {'agency'});		-- add error message
		end
	end
	
	Volume = format_volume_issue (Volume, Issue, ArticleNumber, config.CitationClass, Periodical_origin, sepc, use_lowercase);
	if utilities.is_set (AccessDate) then
		local retrv_text = " " .. cfg.messages'retrieved'
		
		AccessDate = vi_formatdate(AccessDate, true);
		AccessDate = nowrap_date (AccessDate);									-- wrap in nowrap span if date in appropriate format
		if (sepc ~= ".") then retrv_text = retrv_text:lower() end				-- if mode is cs2, lower case
		AccessDate = utilities.substitute (retrv_text, AccessDate);				-- add retrieved text
		AccessDate = utilities.substitute (cfg.presentation'accessdate', {sepc, AccessDate});	-- allow editors to hide accessdates
	end
	
	if utilities.is_set (ID) then ID = sepc .. " " .. ID; end
	
	local Docket = A'Docket';
	if "thesis" == config.CitationClass and utilities.is_set (Docket) then
		ID = sepc .. " Docket " .. Docket .. ID;
	end
	if "report" == config.CitationClass and utilities.is_set (Docket) then		-- for cite report when |docket= is set
		ID = sepc .. ' ' .. Docket;												-- overwrite ID even if |id= is set
	end
	if utilities.is_set (URL) then
		URL = " " .. external_link( URL, nil, URL_origin, UrlAccess );
	end
	
	-- We check length of PostScript here because it will have been nuked by
	-- the quote parameters. We'd otherwise emit a message even if there wasn't
	-- a displayed postscript.
	-- TODO: Should the max size (1) be configurable?
	-- TODO: Should we check a specific pattern?
	if utilities.is_set(PostScript) and mw.ustring.len(PostScript) > 1 then
		utilities.set_message ('maint_postscript')
	end
	
	local Archived;
	if utilities.is_set (ArchiveURL) then
		if not utilities.is_set (ArchiveDate) then								-- ArchiveURL set but ArchiveDate not set
			utilities.set_message ('err_archive_missing_date');					-- emit an error message
			ArchiveURL = ;													-- empty string for concatenation
			ArchiveDate = ;													-- empty string for concatenation
		end
	else														
		if utilities.is_set (ArchiveDate) then									-- ArchiveURL not set but ArchiveDate is set
			utilities.set_message ('err_archive_date_missing_url');				-- emit an error message
			ArchiveURL = ;													-- empty string for concatenation
			ArchiveDate = ;													-- empty string for concatenation
		end
	end
	
	ArchiveDate = vi_formatdate(ArchiveDate, true)
	if utilities.is_set (ArchiveURL) then
		local arch_text;
		if "live" == UrlStatus then
			arch_text = cfg.messages'archived';
			if sepc ~= "." then arch_text = arch_text:lower() end
			if utilities.is_set (ArchiveDate) then
				Archived = sepc .. ' ' .. utilities.substitute ( cfg.messages'archived-live',
					{external_link( ArchiveURL, arch_text, A:ORIGIN('ArchiveURL'), nil) .. ArchiveFormat, ArchiveDate } );
			else
				Archived = ;
			end
			if not utilities.is_set (OriginalURL) then
				utilities.set_message ('err_archive_missing_url');
				Archived = ;													-- empty string for concatenation
			end
		elseif utilities.is_set (OriginalURL) then								-- UrlStatus is empty, 'dead', 'unfit', 'usurped', 'bot: unknown'
			if utilities.in_array (UrlStatus, {'unfit', 'usurped', 'bot: unknown'}) then
				arch_text = cfg.messages'archived-unfit';
				if sepc ~= "." then arch_text = arch_text:lower() end
				Archived = sepc .. ' ' .. arch_text .. ArchiveDate;				-- format already styled
				if 'bot: unknown' == UrlStatus then
					utilities.set_message ('maint_bot_unknown');				-- and add a category if not already added
				else
					utilities.add_prop_cat ('unfit');							-- and add a category if not already added
				end
			else																-- UrlStatus is empty, 'dead'
				arch_text = cfg.messages'archived-dead';
				if sepc ~= "." then arch_text = arch_text:lower() end
				if utilities.is_set (ArchiveDate) then
					Archived = sepc .. " " .. utilities.substitute ( arch_text,
						{ external_link( OriginalURL, cfg.messages'original', OriginalURL_origin, OriginalAccess ) .. OriginalFormat, ArchiveDate } );	-- format already styled
				else
					Archived = ;												-- unset for concatenation
				end
			end	
		else																	-- OriginalUrl not set
			utilities.set_message ('err_archive_missing_url');
			Archived = ;														-- empty string for concatenation
		end
	elseif utilities.is_set (ArchiveFormat) then
		Archived = ArchiveFormat;												-- if set and ArchiveURL not set ArchiveFormat has error message
	else
		Archived = ;
	end
	
	local TranscriptURL = A'TranscriptURL'
	local TranscriptFormat = A'TranscriptFormat';
	TranscriptFormat = style_format (TranscriptFormat, TranscriptURL, 'transcript-format', 'transcripturl');
	local Transcript = A'Transcript';
	local TranscriptURL_origin = A:ORIGIN('TranscriptURL');						-- get name of parameter that holds TranscriptURL
	if utilities.is_set (Transcript) then
		if utilities.is_set (TranscriptURL) then
			Transcript = external_link( TranscriptURL, Transcript, TranscriptURL_origin, nil );
		end
		Transcript = sepc .. ' ' .. Transcript .. TranscriptFormat;
	elseif utilities.is_set (TranscriptURL) then
		Transcript = external_link( TranscriptURL, nil, TranscriptURL_origin, nil );
	end
	local Publisher;
	if utilities.is_set (PublicationDate) then
		PublicationDate = wrap_msg ('published', vi_formatdate(PublicationDate, true));
	end
	if utilities.is_set (PublisherName) then
		if utilities.is_set (PublicationPlace) then
			Publisher = sepc .. " " .. PublicationPlace .. ": " .. PublisherName .. PublicationDate;
		else
			Publisher = sepc .. " " .. PublisherName .. PublicationDate;  
		end			
	elseif utilities.is_set (PublicationPlace) then 
		Publisher= sepc .. " " .. PublicationPlace .. PublicationDate;
	else 
		Publisher = PublicationDate;
	end
	
	-- Several of the above rely upon detecting this as nil, so do it last.
	if (utilities.is_set (Periodical) or utilities.is_set (ScriptPeriodical) or utilities.is_set (TransPeriodical)) then
		if utilities.is_set (Title) or utilities.is_set (TitleNote) then 
			Periodical = sepc .. " " .. format_periodical (ScriptPeriodical, ScriptPeriodical_origin, Periodical, TransPeriodical, TransPeriodical_origin);
		else 
			Periodical = format_periodical (ScriptPeriodical, ScriptPeriodical_origin, Periodical, TransPeriodical, TransPeriodical_origin);
		end
	end
	
	local Language = A'Language';
	if utilities.is_set (Language) then
		Language = language_parameter (Language);								-- format, categories, name from ISO639-1, etc.
	else
		Language=;															-- language not specified so make sure this is an empty string;
	-- TODO: need to extract the wrap_msg from language_parameter
	so that we can solve parentheses bunching problem with Format/Language/TitleType
	
	end
	--event= parameter value (if provided).
	
	if "speech" == config.CitationClass then									-- cite speech only
		TitleNote = TitleType;													-- move TitleType to TitleNote so that it renders ahead of |event=
		TitleType = ;															-- and unset
		if utilities.is_set (Periodical) then									-- if Periodical, perhaps because of an included |website= or |journal= parameter 
			if utilities.is_set (Conference) then								-- and if |event= is set
				Conference = Conference .. sepc .. " ";							-- then add appropriate punctuation to the end of the Conference variable before rendering
			end
		end
	end
	-- Piece all bits together at last.  Here, all should be non-nil.
	-- We build things this way because it is more efficient in LUA
	-- not to keep reassigning to the same string variable over and over.
	local tcommon;
	local tcommon2;																-- used for book cite when |contributor= is set
	
	if utilities.in_array (config.CitationClass, {"book", "citation"}) and not utilities.is_set (Periodical) then		-- special cases for book cites
		if utilities.is_set (Contributors) then									-- when we are citing foreword, preface, introduction, etc.
			tcommon = safe_join ({Title, TitleNote}, sepc);						-- author and other stuff will come after this and before tcommon2
			tcommon2 = safe_join ({TitleType, Series, Language, Volume, Others, Edition, Publisher}, sepc);
		else
			tcommon = safe_join ({Title, TitleNote, TitleType, Series, Language, Volume, Others, Edition, Publisher}, sepc);
		end
	elseif 'map' == config.CitationClass then									-- special cases for cite map
		if utilities.is_set (Chapter) then										-- map in a book; TitleType is part of Chapter
			tcommon = safe_join ({Title, Edition, Scale, Series, Language, Cartography, Others, Publisher, Volume}, sepc);
		elseif utilities.is_set (Periodical) then								-- map in a periodical
			tcommon = safe_join ({Title, TitleType, Periodical, Scale, Series, Language, Cartography, Others, Publisher, Volume}, sepc);
		else																	-- a sheet or stand-alone map
			tcommon = safe_join ({Title, TitleType, Edition, Scale, Series, Language, Cartography, Others, Publisher}, sepc);
		end
		
	elseif 'episode' == config.CitationClass then								-- special case for cite episode
		tcommon = safe_join ({Title, TitleNote, TitleType, Series, Language, Edition, Publisher}, sepc);
	else																		-- all other CS1 templates
		tcommon = safe_join ({Title, TitleNote, Conference, Periodical, TitleType, Series, Language, Volume, Others, Edition, Publisher, Agency}, sepc);
	end
	
	if #ID_list > 0 then
		ID_list = safe_join( { sepc .. " ",  table.concat( ID_list, sepc .. " " ), ID }, sepc );
	else
		ID_list = ID;
	end
	
	local Via = A'Via';
	Via = utilities.is_set (Via) and  wrap_msg ('via', Via) or ;
	local idcommon;
	if 'audio-visual' == config.CitationClass or 'episode' == config.CitationClass then	-- special case for cite AV media & cite episode position transcript
		idcommon = safe_join( { ID_list, URL, Archived, Transcript, AccessDate, Via, Quote }, sepc );
	else
		idcommon = safe_join( { ID_list, URL, Archived, AccessDate, Via, Quote }, sepc );
	end
	
	local text;
	local pgtext = Position .. Sheet .. Sheets .. Page .. Pages .. At;
	local OrigDate = A'OrigDate';
	OrigDate = utilities.is_set (OrigDate) and wrap_msg ('origdate', vi_formatdate(OrigDate, true)) or ;
	if utilities.is_set (Date) then
		if utilities.is_set (Authors) or utilities.is_set (Editors) then		-- date follows authors or editors when authors not set
			Date = " (" .. Date .. ")" .. OrigDate .. sepc .. " ";				-- in parentheses
		else																	-- neither of authors and editors set
			if (string.sub(tcommon, -1, -1) == sepc) then						-- if the last character of tcommon is sepc
				Date = " " .. Date .. OrigDate;									-- Date does not begin with sepc
			else
				Date = sepc .. " " .. Date .. OrigDate;							-- Date begins with sepc
			end
		end
	end	
	if utilities.is_set (Authors) then
		if (not utilities.is_set (Date)) then									-- when date is set it's in parentheses; no Authors termination
			Authors = terminate_name_list (Authors, sepc);						-- when no date, terminate with 0 or 1 sepc and a space
		end
		if utilities.is_set (Editors) then
			local in_text = ;
			local post_text = ;
			if utilities.is_set (Chapter) and 0 == #c then
				in_text = cfg.messages'in' .. ' ';
				if (sepc ~= '.') then
					in_text = in_text:lower();									-- lowercase for cs2
				end
			end
			if EditorCount  element
	local options_t = {};
	options_t.class = cite_class_attribute_make (config.CitationClass, Mode);
	local Ref = is_valid_parameter_value (A'Ref', A:ORIGIN('Ref'), cfg.keywords_lists'ref', nil, true);	-- nil when |ref=harv; A'Ref' else
	if 'none' ~= cfg.keywords_xlate(Ref and Ref:lower()) or  then
		local namelist_t = {};													-- holds selected contributor, author, editor name list
		local year = first_set ({Year, anchor_year}, 2);						-- Year first for legacy citations and for YMD dates that require disambiguation
		if #c > 0 then															-- if there is a contributor list
			namelist_t = c;														-- select it
		elseif #a > 0 then														-- or an author list
			namelist_t = a;
		elseif #e > 0 then														-- or an editor list
			namelist_t = e;
		end
		local citeref_id;
		if #namelist_t > 0 then													-- if there are names in namelist_t
			citeref_id = make_citeref_id (namelist_t, year);					-- go make the CITEREF anchor
			if mw.uri.anchorEncode (citeref_id) == ((Ref and mw.uri.anchorEncode (Ref)) or ) then	-- Ref may already be encoded (by ) so citeref_id must be encoded before comparison
				utilities.set_message ('maint_ref_duplicates_default');
			end
		else
			citeref_id = ;													-- unset
		end
		options_t.id = Ref or citeref_id;
	end
	if string.len (text:gsub('%b', )) ... tags
		table.insert (render_t, utilities.substitute (cfg.presentation'cite-id', {mw.uri.anchorEncode(options_t.id), mw.text.nowiki(options_t.class), text}));	-- when |ref= is set or when there is a namelist
	else
		table.insert (render_t, utilities.substitute (cfg.presentation'cite', {mw.text.nowiki(options_t.class), text}));	-- when |ref=none or when namelist_t empty and |ref= is missing or is empty
	end		
	if OCinSoutput then															-- blanked when citation is 'empty' so don't bother to add boilerplate metadata span
		table.insert (render_t, utilities.substitute (cfg.presentation'ocins', OCinSoutput));	-- format and append metadata to the citation
	end
	local template_name = ('citation' == config.CitationClass) and 'Chú thích' or 'Chú thích ' .. (cfg.citation_class_map_tconfig.CitationClass or config.CitationClass);
	local template_link =  .. template_name .. ;
	local msg_prefix = ': ';
	if 0 ~= #z.error_msgs_t then
		mw.addWarning (utilities.substitute (cfg.messages.warning_msg_e, template_link));
		table.insert (render_t, ' ');											-- insert a space between citation and its error messages
		table.sort (z.error_msgs_t);											-- sort the error messages list; sorting includes wrapping  and  tags; hidden-error sorts ahead of visible-error
		local hidden = true;													-- presume that the only error messages emited by this template are hidden
		for _, v in ipairs (z.error_msgs_t) do									-- spin through the list of error messages
			if v:find ('cs1-visible-error', 1, true) then						-- look for the visible error class name
				hidden = false;													-- found one; so don't hide the error message prefix
				break;															-- and done because no need to look further
			end
		end
		z.error_msgs_t1 = table.concat ({utilities.error_comment (msg_prefix, hidden), z.error_msgs_t1});	-- add error message prefix to first error message to prevent extraneous punctuation
		table.insert (render_t, table.concat (z.error_msgs_t, '; '));			-- make a big string of error messages and add it to the rendering
	end
	if 0 ~= #z.maint_cats_t then
		mw.addWarning (utilities.substitute (cfg.messages.warning_msg_m, template_link));
		table.sort (z.maint_cats_t);											-- sort the maintenance messages list
		local maint_msgs_t = {};												-- here we collect all of the maint messages
		if 0 == #z.error_msgs_t then											-- if no error messages
			table.insert (maint_msgs_t, msg_prefix);							-- insert message prefix in maint message livery
		end
		
		for _, v in ipairs( z.maint_cats_t ) do									-- append maintenance categories
			table.insert (maint_msgs_t, 										-- assemble new maint message and add it to the maint_msgs_t table
				table.concat ({v, ' (', utilities.substitute (cfg.messages':cat wikilink', v), ')'})
				);
		end
		table.insert (render_t, utilities.substitute (cfg.presentation'hidden-maint', table.concat (maint_msgs_t, ' ')));	-- wrap the group of maint messages with proper presentation and save
	end
	if not no_tracking_cats then
		local sort_key;
		local cat_wikilink = 'cat wikilink';
		if cfg.enable_sort_keys then											-- when namespace sort keys enabled
			local namespace_number = mw.title.getCurrentTitle().namespace;		-- get namespace number for this wikitext
			sort_key = (0 ~= namespace_number and (cfg.name_space_sort_keysnamespace_number or cfg.name_space_sort_keys.other)) or nil;	-- get sort key character; nil for mainspace
			cat_wikilink = (not sort_key and 'cat wikilink') or 'cat wikilink sk';	-- make  key
		end				
		for _, v in ipairs (z.error_cats_t) do									-- append error categories
			table.insert (render_t, utilities.substitute (cfg.messagescat_wikilink, {v, sort_key}));
		end
		if cfg.id_limits_data_load_fail then									-- boolean true when load failed
			utilities.set_message ('maint_id_limit_load_fail');					-- done here because this maint cat emits no message
		end
		for _, v in ipairs (z.maint_cats_t) do									-- append maintenance categories
			table.insert (render_t, utilities.substitute (cfg.messagescat_wikilink, {v, sort_key}));
		end
		for _, v in ipairs (z.prop_cats_t) do									-- append properties categories
			table.insert (render_t, utilities.substitute (cfg.messages'cat wikilink', v));	-- no sort keys
		end
	end
	return table.concat (render_t);												-- make a big string and done
end
------------------------------------------------------------------------------------------
Looks for a parameter's name in one of several whitelists.
Parameters in the whitelist can have three values:
	true - active, supported parameters
	false - deprecated, supported parameters
	nil - unsupported parameters
	
local function validate (name, cite_class, empty)
	local name = tostring (name);
	local enum_name;															-- parameter name with enumerator (if any) replaced with '#'
	local state;
	local function state_test (state, name)										-- local function to do testing of state values
		if true == state then return true; end									-- valid actively supported parameter
		if false == state then
			if empty then return nil; end										-- empty deprecated parameters are treated as unknowns
			deprecated_parameter (name);										-- parameter is deprecated but still supported
			return true;
		end
		if 'tracked' == state then
			local base_name = name:gsub ('%d', );								-- strip enumerators from parameter names that have them to get the base name
			utilities.add_prop_cat ('tracked-param', {base_name}, base_name);	-- add a properties category;  modifies 
			return true;
		end
		return nil;
	end		
	if name:find ('#') then														-- # is a cs1|2 reserved character so parameters with # not permitted
		return nil;
	end
																				-- replace enumerator digit(s) with # (|last25= becomes |last#=) (mw.ustring because non-Western 'local' digits)
	enum_name = mw.ustring.gsub (name, '%d+$', '#');							-- where enumerator is last charaters in parameter name (these to protect |s2cid=)
	enum_name = mw.ustring.gsub (enum_name, '%d+(%-l)', '#%1');				-- where enumerator is in the middle of the parameter name; |author#link= is the oddity
	if 'document' == cite_class then											-- special case for 
		state = whitelist.document_parameters_tenum_name;						-- this list holds enumerated and nonenumerated parameters
		if true == state_test (state, name) then return true; end
		
		return false;
	end
	if utilities.in_array (cite_class, whitelist.preprint_template_list_t) then	-- limited parameter sets allowed for these templates
		state = whitelist.limited_parameters_tenum_name;						-- this list holds enumerated and nonenumerated parameters
		if true == state_test (state, name) then return true; end
		state = whitelist.preprint_arguments_tcite_classname;				-- look in the parameter-list for the template identified by cite_class
		if true == state_test (state, name) then return true; end
		return false;															-- not supported because not found or name is set to nil
	end																			-- end limited parameter-set templates
	if utilities.in_array (cite_class, whitelist.unique_param_template_list_t) then 	-- template-specific parameters for templates that accept parameters from the basic argument list
		state = whitelist.unique_arguments_tcite_classname;					-- look in the template-specific parameter-lists for the template identified by cite_class
		if true == state_test (state, name) then return true; end
	end																			-- if here, fall into general validation
	state = whitelist.common_parameters_tenum_name;							-- all other templates; all normal parameters allowed; this list holds enumerated and nonenumerated parameters
	if true == state_test (state, name) then return true; end
	return false;																-- not supported because not found or name is set to nil
end
--=-----------------------------------------------------------------------
check  for inter-language interwiki-link markup.   must be a MediaWiki-recognized language
code.  when these values have the form (without leading colon):
	label return label as plain-text
	:link return :link as plain-text
return value as is else
**
local function inter_wiki_check (parameter, value)
	local prefix = value:match ('%%(%a+):');									-- get an interwiki prefix if one exists
	local _;
	
	if prefix and cfg.inter_wiki_mapprefix:lower() then						-- if prefix is in the map, needs preceding colon so
		utilities.set_message ('err_bad_paramlink', parameter);					-- emit an error message
		_, value, _ = utilities.is_wikilink (value);							-- extract label portion from wikilink
	end
	return value;
end
----------------------------------------------------------------------
Look at the contents of a parameter. If the content has a string of characters and digits followed by an equal
sign, compare the alphanumeric string to the list of cs1|2 parameters.  If found, then the string is possibly a
parameter that is missing its pipe.  There are two tests made:
	title=Title access-date=2016-03-17	-- the first parameter has a value and whitespace separates that value from the missing pipe parameter name
	title=access-date=2016-03-17			-- the first parameter has no value (whitespace after the first = is trimmed by MediaWiki)
cs1|2 shares some parameter names with XML/HTML attributes: class=, title=, etc.  To prevent false positives XML/HTML
tags are removed before the search.
If a missing pipe is detected, this function adds the missing pipe maintenance category.
local function missing_pipe_check (parameter, value)
	local capture;
	value = value:gsub ('%b', );											-- remove XML/HTML tags because attributes: class=, title=, etc.
	capture = value:match ('%s+(%a%w%-+)%s*=') or value:match ('^(%a%w%-+)%s*=');	-- find and categorize parameters with possible missing pipes
	if capture and validate (capture) then										-- if the capture is a valid parameter name
		utilities.set_message ('err_missing_pipe', parameter);
	end
end
------------------------------------------------------------------
look for extraneous terminal punctuation in most parameter values; parameters listed in skip table are not checked
local function has_extraneous_punc (param, value)
	if 'number' == type (param) then
		return;
	end
	
	param = param:gsub ('%d+', '#');											-- enumerated name-list mask params allow terminal punct; normalize 
	if cfg.punct_skipparam then
		return;																	-- parameter name found in the skip table so done
	end
	
	if value:match (',;:$') then
		utilities.set_message ('maint_extra_punct');							-- has extraneous punctuation; add maint cat
	end
	if value:match ('^=') then													-- sometimes an extraneous '=' character appears ...
		utilities.set_message ('maint_extra_punct');							-- has extraneous punctuation; add maint cat
	end
end
------------------------------------------------------------------------------------
look for The Wikipedia Library urls in url-holding parameters.  TWL urls are accessible for readers who are not
active extended confirmed Wikipedia editors.  This function emits an error message when such urls are discovered.
looks for: '.wikipedialibrary.idm.oclc.org'
local function has_twl_url (url_params_t)
	local url_error_t = {};														-- sequence of url-holding parameters that have a TWL url
	
	for param, value in pairs (url_params_t) do
		if value:find ('%.wikipedialibrary%.idm%.oclc%.org') then				-- has the TWL base url?
			table.insert (url_error_t, utilities.wrap_style ('parameter', param));	-- add parameter name to the list
		end
	end
	if 0 ~= #url_error_t then													-- non-zero when there are errors
		table.sort (url_error_t);
		utilities.set_message ('err_param_has_twl_url', {utilities.make_sep_list (#url_error_t, url_error_t)});	-- add this error message
		return true;
	end
end
----------------------------------------------------------------------
look for extraneous url parameter values; parameters listed in skip table are not checked
local function has_extraneous_url (non_url_param_t)
	local url_error_t = {};
	
	check_for_url (non_url_param_t, url_error_t);									-- extraneous url check
	if 0 ~= #url_error_t then													-- non-zero when there are errors
		table.sort (url_error_t);
		utilities.set_message ('err_param_has_ext_link', {utilities.make_sep_list (#url_error_t, url_error_t)});	-- add this error message
	end
end
--2 parameters in the template (the template frame)
	config – table of template-supplied parameter (the #invoke frame)
local function _citation (frame, args, config)									-- save a copy in case we need to display an error message in preview mode
	if not frame then
		frame = mw.getCurrentFrame();											-- if called from another module, get a frame for frame-provided functions
	end
																				-- i18n: set the name that your wiki uses to identify sandbox subpages from sandbox template invoke (or can be set here)
	local sandbox = ((config.SandboxPath and  ~= config.SandboxPath) and config.SandboxPath) or '/sandbox';	-- sandbox path from SandboxPath=/...
	is_sandbox = nil ~= string.find (frame:getTitle(), sandbox, 1, true);		-- is this invoke the sandbox module?
	sandbox = is_sandbox and sandbox or ;										-- use i18n sandbox to load sandbox modules when this module is the sandox; live modules else
	
	cfg = mw.loadData ('Module:Citation/CS1/Configuration' .. sandbox);			-- load sandbox versions of support modules when ...; live modules else
	whitelist = mw.loadData ('Module:Citation/CS1/Whitelist' .. sandbox);
	utilities = require ('Module:Citation/CS1/Utilities' .. sandbox);
	validation = require ('Module:Citation/CS1/Date_validation' .. sandbox);
	identifiers = require ('Module:Citation/CS1/Identifiers' .. sandbox);
	metadata = require ('Module:Citation/CS1/COinS' .. sandbox);
	utilities.set_selected_modules (cfg);										-- so that functions in Utilities can see the selected cfg tables
	identifiers.set_selected_modules (cfg, utilities);							-- so that functions in Identifiers can see the selected cfg tables and selected Utilities module
	validation.set_selected_modules (cfg, utilities);							-- so that functions in Date validataion can see selected cfg tables and the selected Utilities module
	metadata.set_selected_modules (cfg, utilities);								-- so that functions in COinS can see the selected cfg tables and selected Utilities module
	z = utilities.z;															-- table of error and category tables in Module:Citation/CS1/Utilities
	is_preview_mode = not utilities.is_set (frame:preprocess ());
	local suggestions = {};														-- table where we store suggestions if we need to loadData them
	local error_text;															-- used as a flag
	local capture;																-- the single supported capture when matching unknown parameters using patterns
	local empty_unknowns = {};													-- sequence table to hold empty unknown params for error message listing
	for k, v in pairs( args ) do												-- get parameters from the parent (template) frame
		v = mw.ustring.gsub (v, '^%s*(.-)%s*$', '%1');							-- trim leading/trailing whitespace; when v is only whitespace, becomes empty string
		if v ~=  then
			if ('string' == type (k)) then
				k = mw.ustring.gsub (k, '%d', cfg.date_names.local_digits);		-- for enumerated parameters, translate 'local' digits to Western 0-9
			end
			if not validate( k, config.CitationClass ) then			
				if type (k) ~= 'string' then									-- exclude empty numbered parameters
					if v:match("%S+") ~= nil then
						error_text = utilities.set_message ('err_text_ignored', {v});
					end
				elseif validate (k:lower(), config.CitationClass) then 
					error_text = utilities.set_message ('err_parameter_ignored_suggest', {k, k:lower()});	-- suggest the lowercase version of the parameter
				else
					if nil == suggestions.suggestions then						-- if this table is nil then we need to load it
						suggestions = mw.loadData ('Module:Citation/CS1/Suggestions' .. sandbox);	--load sandbox version of suggestion module when ...; live module else
					end
					for pattern, param in pairs (suggestions.patterns) do		-- loop through the patterns to see if we can suggest a proper parameter
						capture = k:match (pattern);							-- the whole match if no capture in pattern else the capture if a match
						if capture then											-- if the pattern matches 
							param = utilities.substitute (param, capture);		-- add the capture to the suggested parameter (typically the enumerator)
							if validate (param, config.CitationClass) then		-- validate the suggestion to make sure that the suggestion is supported by this template (necessary for limited parameter lists)
								error_text = utilities.set_message ('err_parameter_ignored_suggest', {k, param});	-- set the suggestion error message
							else
								error_text = utilities.set_message ('err_parameter_ignored', {k});	-- suggested param not supported by this template
								v = ;											-- unset
							end
						end
					end
					if not utilities.is_set (error_text) then					-- couldn't match with a pattern, is there an explicit suggestion?						
						if (suggestions.suggestions k:lower()  ~= nil) and validate (suggestions.suggestions k:lower() , config.CitationClass) then
							utilities.set_message ('err_parameter_ignored_suggest', {k, suggestions.suggestions k:lower() });
						else
							utilities.set_message ('err_parameter_ignored', {k});
							v = ;												-- unset value assigned to unrecognized parameters (this for the limited parameter lists)
						end
					end
				end				  
			end
			argsk = v;														-- save this parameter and its value
		elseif not utilities.is_set (v) then									-- for empty parameters
			if not validate (k, config.CitationClass, true) then				-- is this empty parameter a valid parameter
				k = ( == k) and '(empty string)' or k;						-- when k is empty string (or was space(s) trimmed to empty string), replace with descriptive text
				table.insert (empty_unknowns, utilities.wrap_style ('parameter', k));	-- format for error message and add to the list
			end
																				-- crude debug support that allows us to render a citation from module  TODO: keep?
	--	elseif argsk ~= nil or (k == 'postscript') then						-- when argsk has a value from  frame (we don't normally do that)
	--		argsk = v;														-- overwrite argsk with empty string from pframe.argsk (template frame); v is empty string here
		end																		-- not sure about the postscript bit; that gets handled in parameter validation; historical artifact?
	end	
	if 0 ~= #empty_unknowns then												-- create empty unknown error message
		utilities.set_message ('err_param_unknown_empty', {
			1 == #empty_unknowns and  or 's',
			utilities.make_sep_list (#empty_unknowns, empty_unknowns)
			});
	end
	local non_url_param_t = {};													-- table of parameters and values that are not url-holding parameters
	local url_param_t = {};
	for k, v in pairs( args ) do
		if 'string' == type (k) then											-- don't evaluate positional parameters
			has_invisible_chars (k, v);											-- look for invisible characters
		end
		has_extraneous_punc (k, v);												-- look for extraneous terminal punctuation in parameter values
		missing_pipe_check (k, v);												-- do we think that there is a parameter that is missing a pipe?
		argsk = inter_wiki_check (k, v);										-- when language interwiki-linked parameter missing leading colon replace with wiki-link label
		if 'string' == type (k) then											-- when parameter k is not positional
			if not cfg.url_skipk then											-- and not in url skip table
				non_url_param_tk = v;											-- make a parameter/value list for extraneous url check
			else																-- and is in url skip table (a url-holding parameter)
				url_param_tk = v;												-- make a parameter/value list to check for values that are The Wikipedia Library url
			end
		end
	end
	has_extraneous_url (non_url_param_t);										-- look for url in parameter values where a url does not belong
	if has_twl_url (url_param_t) then												-- look for url-holding parameters that hold a The Wikipedia Library url
		args'url-access' = 'subscription';
	end
	return table.concat ({
		frame:extensionTag ('templatestyles', , {src='Module:Citation/CS1' .. sandbox .. '/styles.css'}),
		citation0( config, args)
	});
end
------------------------------------------------------------------------------------------
Template entry point
local function citation (frame)
	local config_t = {};														-- table to store parameters from the module 
	local args_t = frame:getParent().args;										-- get template's preset parameters
	for k, v in pairs (frame.args) do											-- get parameters from the  frame
		config_tk = v;
	--	args_tk = v;															-- crude debug support that allows us to render a citation from module ; skips parameter validation; TODO: keep?
	end	
	return _citation (frame, args_t, config_t)
end
----------------------------------------------------------------------
	
return {
	citation = citation,														-- template entry point
	
	_citation = _citation,														-- module entry point
	}