Module:Authority control

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This module contains the code of the {{Authority control}} template. See its documentation.

Parameters, Wikidata properties, and tracking categories

Lua error in mw.title.lua at line 209: too many expensive function calls.

Additional tracking categories

This module also implements the following hidden tracking categories:

Number of identifiers

State parameter

See also

require('Module:No globals')

local p = {}
local title = mw.title.getCurrentTitle()
local namespace = title.namespace
local testcases = (string.sub(title.subpageText,1,9) == 'testcases')

--[[==========================================================================]]
--[[                            Category functions                            ]]
--[[==========================================================================]]

local function addCat( cat )
	if cat and cat ~= '' then return '[[Category:'..cat..']]'..p.redCatLink(cat) end
	return ''
end

function p.getCatForId( id )
	local cat = ''
	if namespace == 0 then
		cat = 'Articles with '..id..' identifiers'
	end
	return addCat(cat)
end

function p.redCatLink( cat ) --cat == 'Blah' (not 'Category:Blah', not '[[Category:Blah]]')
	if cat and cat ~= '' and testcases == false and mw.title.new(cat, 14).exists == false then
		return '[[Category:Pages with red-linked authority control categories]]'
	end
	return ''
end

function p.createRow( id, rawValues, link, links, withUid, specialCat, prefix)
	local faultyCat = 'Articles with faulty '..(specialCat or id)..' identifiers'
	if links then -- all links[] use withUid = false; no check needed
		local row = ''
		if prefix then
			row = row..'*'..prefix
		end
		for i, l in ipairs( links ) do
			if i == 1 and not prefix then row = row..'*'
			else           row = row..'\n**' end
			if l then
				row = row..'<span class="uid">'..l..'</span>'
			else
				row = row..'<span class="error">The '..id..' id '..rawValues[i]..' is not valid.</span>'..addCat(faultyCat)
			end
		end
		return row..'\n'
	elseif link then -- All IDs that have a prefix support multiple identifiers, so prefix is not needed
		if withUid then
			return '*<span class="nowrap"><span class="uid">'..link..'</span></span>\n'
		end
		return '*<span class="nowrap">'..link..'</span>\n'
	end

	return '* <span class="error">The '..id..' id '..rawValues..' is not valid.</span>'..addCat(faultyCat)..'\n'
end

--[[==========================================================================]]
--[[                      Property formatting functions                       ]]
--[[==========================================================================]]

-- If a link has a suitable entry in the global inter-wiki prefix table at [[:m:Interwiki_map]],
-- please consider routing through this prefix rather than as external link URL.
-- This will ease future maintenance as necessary updates to the link can be centrally carried out there rather than by updating this module.
-- The "external link" icon would disappear for such entries.

function p.aagLink( id, label)
	--P3372's format regex: \d+ (e.g. 1)
	if not id:match( '^%d+$' ) then
		return false
	end
	return '[https://www.aucklandartgallery.com/explore-art-and-ideas/artist/'..id..'/ '..(label or 'Auckland')..']'..p.getCatForId( 'AAG' )
end

function p.acmLink( id, label )
	--P864's format regex: \d{11} (e.g. 12345678901)
	if not id:match( '^%d%d%d%d%d%d%d%d%d%d%d$' ) then
		return false
	end
	return '[https://dl.acm.org/profile/'..id..' '..(label or 'Association for Computing Machinery')..']'..p.getCatForId( 'ACM-DL' )
end

function p.adbLink( id, label )
	--P1907's format regex: [a-z][-a-z]+-([1-3]\d|[1-9])\d{0,3} (e.g. barton-sir-edmund-toby-71)
	if not id:match( '^[a-z][-a-z]+-[1-3]%d%d?%d?%d?$' ) and
	   not id:match( '^[a-z][-a-z]+-[1-9]%d?%d?%d?$' ) then
		return false
	end
	return '[http://adb.anu.edu.au/biography/'..id..' '..(label or 'Australia')..']'..p.getCatForId( 'ADB' )
end

function p.admiraltyLink(id,label)
	--P3562's format regex: [A-Q]\d{4}(\.\d+)? (e.g. D1204.1)
	if not id:match('^[A-Q]%d%d%d%d$') and
	   not id:match('^[A-Q]%d%d%d%d%.%d+$') then
		return false
	end
	return id..p.getCatForId( 'admiralty' )
end

function p.agsaLink( id, label )
	--P6804's format regex: [1-9]\d* (e.g. 3625)
	if not id:match( '^[1-9]%d*$' ) then
		return false
	end
	return '[https://www.agsa.sa.gov.au/collection-publications/collection/creators/_/'..id..'/ '..(label or 'South Australia')..']'..p.getCatForId( 'AGSA' )
end

function p.ARLHSLink(id,label)
	--P2980's format regex: [A-Z]{3}\d{3,4}[A-Z]?| e.g. LAT023
	if not id:match('^[A-Z][A-Z][A-Z]%d%d%d%d?[A-Z]?$') then
		return false
	end
	return '[http://wlol.arlhs.com/lighthouse/'..id..'.html '..(label or 'ARLHS')..']'..p.getCatForId( 'ARLHS' )
end

function p.autoresuyLink( id, label )
	--P2558's format regex: [1-9]\d{0,4} (e.g. 12345)
	if not id:match( '^[1-9]%d?%d?%d?%d?$' ) then
		return false
	end
	return '[https://autores.uy/autor/'..id..' '..(label or 'Uruguay')..']'..p.getCatForId( 'autores.uy' )
end

function p.awrLink( id, label )
	--P4186's format regex: (([A-Z]{3}\d{4})|([A-Z]{2}\d{5}))[a-z] (e.g. PR00768b)
	if not id:match( '^[A-Z][A-Z][A-Z]%d%d%d%d[a-z]$' ) and
	   not id:match( '^[A-Z][A-Z]%d%d%d%d%d[a-z]$' ) then
		return false
	end
	return '[http://www.womenaustralia.info/biogs/'..id..'.htm '..(label or 'Australian Women\'s Register')..']'..p.getCatForId( 'AWR' )
end

function p.bibsysLink( id, label )
	--P1015's format regex: [1-9]\d* or [1-9](\d{0,8}|\d{12}) (e.g. 1234567890123)
	--TODO: follow up @ [[d:Property talk:P1015#Discrepancy between the 2 regex constraints]] or escalate/investigate
	if not id:match( '^[1-9]%d?%d?%d?%d?%d?%d?%d?%d?$' ) and
	   not id:match( '^[1-9]%d%d%d%d%d%d%d%d%d%d%d%d$' ) then
		return false
	end
	return '[https://authority.bibsys.no/authority/rest/authorities/html/'..id..' '..(label or 'Norway')..']'..p.getCatForId( 'BIBSYS' )
end

function p.bildLink( id, label )
	--P2092's format regex: \d+ (e.g. 1)
	if not id:match( '^%d+$' ) then
		return false
	end
	return '[https://www.bildindex.de/document/obj'..id..' '..(label or 'Bildindex (Germany)')..']'..p.getCatForId( 'Bildindex' )
end

function p.bncLink( id, label )
	--P1890's format regex: \d{9} (e.g. 123456789)
	if not id:match( '^%d%d%d%d%d%d%d%d%d$' ) then
		return false
	end
	return '[http://www.bncatalogo.cl/F?func=direct&local_base=red10&doc_number='..id..' '..(label or 'Chile')..']'..p.getCatForId( 'BNC' )
end

function p.bneLink( id, label )
	--P950's format regex: (XX|FF|a)\d{4,7}|(bima|bimo|bica|bis[eo]|bivi|Mise|Mimo|Mima)\d{10} (e.g. XX1234567)
	if not id:match( '^[XF][XF]%d%d%d%d%d?%d?%d?$' ) and
	   not id:match( '^a%d%d%d%d%d?%d?%d?$' ) and
	   not id:match( '^bi[mcsv][aoei]%d%d%d%d%d%d%d%d%d%d$' ) and
	   not id:match( '^Mi[sm][eoa]%d%d%d%d%d%d%d%d%d%d$' ) then
		return false
	end
	return '[http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?action=display&authority_id='..id..' '..(label or 'Spain')..']'..p.getCatForId( 'BNE' ) --no https as of 9/2019
end

function p.bnfLink( id, label )
	--P268's format regex: \d{8}[0-9bcdfghjkmnpqrstvwxz] (e.g. 123456789)
	if not id:match( '^c?b?%d%d%d%d%d%d%d%d[0-9bcdfghjkmnpqrstvwxz]$' ) then
		return false
	end
	--Add cb prefix if it has been removed
	if not id:match( '^cb.+$' ) then
		id = 'cb'..id
	end
	return '[https://catalogue.bnf.fr/ark:/12148/'..id..' '..(label or 'France')..'] [https://data.bnf.fr/ark:/12148/'..id..' (data)]'..p.getCatForId( 'BNF' )
end

function p.bnmmLink( id, label )
	--P3788's format regex: \d{9} (e.g. 000024044)
	if id:match( '^%d%d%d%d%d%d%d%d%d$' ) then
		return '[https://catalogo.bn.gov.ar/F/?func=direct&local_base=BNA10&doc_number='..id..' '..(label or 'Argentina')..']'..p.getCatForId( 'BNMM' )
	else
		return false
	end
end

function p.botanistLink( id, label )
	--P428's format regex: ('t )?(d')?(de )?(la )?(van (der )?)?(Ma?c)?(De)?(Di)?\p{Lu}?C?['\p{Ll}]*([-'. ]*(van )?(y )?(d[ae][nr]?[- ])?(Ma?c)?[\p{Lu}bht]?C?['\p{Ll}]*)*\.? ?f?\.? (e.g. L.)
	--not easily/meaningfully implementable in Lua's regex since "(this)?" is not allowed...
	if not mw.ustring.match( id, "^[%u%l%d%. '-]+$" ) then --better than nothing
		return false
	end
	id = id:gsub(' +', '%%20')
	return '[https://www.ipni.org/ipni/advAuthorSearch.do?find_abbreviation='..id..' '..(label or 'International Plant Names Index')..']'..p.getCatForId( 'Botanist' )
end

function p.bpnLink( id, label )
	--P651's format regex: \d{6,8} (e.g. 00123456)
	if not id:match( '^%d%d%d%d%d%d%d%d$' ) and --original format regex, changed 8/2019 to
	   not id:match( '^0?%d%d%d%d%d%d%d$' ) and --allow 1-2 leading 0s, allowed by the website
	   not id:match( '^0?0?%d%d%d%d%d%d$' ) then
		return false
	end
	return '[http://www.biografischportaal.nl/en/persoon/'..id..' '..(label or 'Netherlands')..']'..p.getCatForId( 'BPN' ) --no https as of 9/2019
end

function p.canticLink( id, label )
	--P1273's format regex: a\d{7}[0-9x] (e.g. a10640745)
	if not id:match( '^a%d%d%d%d%d%d%d[%dx]$' ) then
		return false
	end
	return '[http://cantic.bnc.cat/registres/CUCId/'..id..' '..(label or 'Catalonia')..']'..p.getCatForId( 'CANTIC' ) --no https as of 10/2019
end

function p.canticnLink( id, label )
	--P9984's format regex: 981(0|1)\d{9}06706 (e.g. 981058515460906706)
	if not id:match( '^981[0-1]%d%d%d%d%d%d%d%d%d06706$' ) then
		return false
	end
	return '[https://cantic.bnc.cat/registre/'..id..' '..(label or 'Catalonia')..']'..p.getCatForId( 'CANTICN' )
end

function p.ccgLink( id, label )
	--P3920's format regex: ([NAIP])?[1-9]\d*(\.\d+)? (e.g. A1761)
	if not id:match( '^[NAIP]?[1-9]%d*$' ) and
	   not id:match( '^[NAIP]?[1-9]%d*%.%d+$' ) then
		return false
	end
	return id..p.getCatForId( 'CCG' )
end

function p.ciniiLink( id, label )
	--P271's format regex: DA\d{7}[\dX] (e.g. DA12345678)
	if not id:match( '^DA%d%d%d%d%d%d%d[%dX]$' ) then
		return false
	end
	return '[https://ci.nii.ac.jp/author/'..id..'?l=en '..(label or 'CiNii (Japan)')..']'..p.getCatForId( 'CINII' )
end

function p.cwgcLink( id, label )
	--P1908's format regex: [1-9]\d* (e.g. 75228351)
	if not id:match( '^[1-9]%d*$' ) then
		return false
	end
	return '[https://www.cwgc.org/find-war-dead/casualty/'..id..'/ '..(label or 'Commonwealth War Graves Commission')..']'..p.getCatForId( 'CWGC' )
end

function p.emuLink( id, label )
	--P4613's format regex: \d{1,6} (e.g. 15409 (or 015409))
	if not id:match( '^%d%d?%d?%d?%d?%d?$' ) then
		return false
	end
	return '[http://esu.com.ua/search_articles.php?id='..id..' '..(label or 'Ukraine')..']'..p.getCatForId( 'EMU' )
end

function p.daaoLink( id, label )
	--P1707's format regex: [a-z\-]+\d* (e.g. rolf-harris)
	if not id:match( '^[a-z%-]+%d*$' ) then
		return false
	end
	return '[https://www.daao.org.au/bio/'..id..' '..(label or 'Australian Artists')..']'..p.getCatForId( 'DAAO' )
end

function p.dblpLink( id, label )
	--P2456's format regex: \d{2,3} /\d+(-\d+)?|[a-z] /[a-zA-Z][0-9A-Za-z]*(-\d+)? (e.g. 123/123)
	if not id:match( '^%d%d%d?/%d+$' ) and
	   not id:match( '^%d%d%d?/%d+%-%d+$' ) and
	   not id:match( '^[a-z]/[a-zA-Z][0-9A-Za-z]*$' ) and
	   not id:match( '^[a-z]/[a-zA-Z][0-9A-Za-z]*%-%d+$' ) then
		return false
	end
	return '[https://dblp.org/pid/'..id..' '..(label or 'DBLP (computer science)')..']'..p.getCatForId( 'DBLP' )
end

function p.dibLink( id, label )
	--P6829's format regex: a\d{4}\d?(-[A-D])? (e.g. a1953)
	if not id:match( '^a%d%d%d%d%d?%-?[A-D]?$' ) then
		return false
	end
	return '[https://dib.cambridge.org/viewReadPage.do?articleId='..id..' '..(label or 'Ireland')..']'..p.getCatForId( 'DIB' )
end

function p.dsiLink( id, label )
	--P2349's format regex: [1-9]\d* (e.g. 1538)
	if not id:match( '^[1-9]%d*$' ) then
		return false
	end
	return '[http://www.uni-stuttgart.de/hi/gnt/dsi2/index.php?table_name=dsi&function=details&where_field=id&where_value='..id..' '..(label or 'Scientific illustrators')..']'..p.getCatForId( 'DSI' )
end

function p.dtbioLink( id, label )
	--P7902's format regex: 1[0-9]{7,8}[0-9X] (e.g. 118554700)
	if not id:match( '^1[0-9]%d%d%d%d%d%d%d?[0-9X]$' ) then
		return false
	end
	return '[https://www.deutsche-biographie.de/pnd'..id..'.html?language=en '..(label or 'Germany')..']'..p.getCatForId( 'DTBIO' )
end

function p.fastLink( id, label )
	--P2163's format regex: [1-9]\d{0,7} (e.g. 1916996)
	if not id:match( '^[1-9]%d?%d?%d?%d?%d?%d?%d?$' ) then
		return false
	end
	return '[http://id.worldcat.org/fast/'..id..'/ '..(label or 'Faceted Application of Subject Terminology')..']'..p.getCatForId( 'FAST' )
end


function p.fnzaLink( id, label )
	--P6792's format regex: [1-9]\d* (e.g. 9785)
	if not id:match( '^[1-9]%d*$' ) then
		return false
	end
	return '[https://findnzartists.org.nz/artist/'..id..'/ '..(label or 'New Zealand Artists')..']'..p.getCatForId( 'FNZA' )
end

function p.gndLink( id, label )
	--P227's format regex: 1[012]?\d{7}[0-9X]|[47]\d{6}-\d|[1-9]\d{0,7}-[0-9X]|3\d{7}[0-9X] (e.g. 4079154-3)
	if not id:match( '^1[012]?%d%d%d%d%d%d%d[0-9X]$' ) and
	   not id:match( '^[47]%d%d%d%d%d%d%-%d$' ) and
	   not id:match( '^[1-9]%d?%d?%d?%d?%d?%d?%d?%-[0-9X]$' ) and
	   not id:match( '^3%d%d%d%d%d%d%d[0-9X]$' ) then
		return false
	end
	return '[https://d-nb.info/gnd/'..id..' '..(label or 'Germany')..']'..p.getCatForId( 'GND' )
end

function p.googleLink( id, label )
	--P1960's format regex: [-_0-9A-Za-z]{12} (e.g. CUO0vDcAAAAJ)
	if not id:match( '^[%-_%d%l%u][%-_%d%l%u][%-_%d%l%u][%-_%d%l%u][%-_%d%l%u][%-_%d%l%u][%-_%d%l%u][%-_%d%l%u][%-_%d%l%u][%-_%d%l%u][%-_%d%l%u][%-_%d%l%u]$' ) then
		return false
	end
	return '[https://scholar.google.com/citations?user='..id..' '..(label or 'Google Scholar')..']'..p.getCatForId( 'Google Scholar' )
end

function p.hdsLink( id, label )
	--P902's format regex: \d{6} (e.g. 050123)
	if not id:match( '^%d%d%d%d%d%d$' ) then
		return false
	end
	return '[https://hls-dhs-dss.ch/fr/articles/'..id..' '..(label or 'Historical Dictionary of Switzerland')..']'..p.getCatForId( 'HDS' )
end

function p.iaafLink( id, label )
	--P1146's format regex: [0-9][0-9]* (e.g. 012)
	if not id:match( '^%d+$' ) then
		return false
	end
	return '[https://www.iaaf.org/athletes/_/'..id..' '..(label or 'World Athletics')..']'..p.getCatForId( 'IAAF' )
end

function p.iccuLink( id, label )
	--P396's format regex: \D{2}[A-Z0-3]V\d{6} (e.g. CFIV000163)
	if not id:match( '^%u%u[%u0-3]V%d%d%d%d%d%d$' ) then --legacy: %u used here instead of %D (but the faulty ID cat is empty, out of ~12k uses)
		return false
	end
	return '[https://opac.sbn.it/nome/'..id..' '..(label or 'Italy')..']'..p.getCatForId( 'ICCU' )
end

function p.iciaLink( id, label )
	--P1736's format regex: \d+ (e.g. 1)
	if not id:match( '^%d+$' ) then
		return false
	end
	return '[https://www.imj.org.il/artcenter/newsite/en/?artist='..id..' '..(label or 'ICIA (Israel)')..']'..p.getCatForId( 'ICIA' )
end

function p.ieuLink( id, label )
	--P9070's format regex: [A-Z]\\[A-Z]\\[A-Za-z0-9]+ (e.g. K\Y\Kyiv)
	if not id:match( '^[A-Z]\\[A-Z]\\%w+$' ) then
		return false
	end
	return '[http://www.encyclopediaofukraine.com/display.asp?linkpath=pages\\'..id..' '..(label or 'Internet Encyclopedia of Ukraine')..']'..p.getCatForId( 'IEU' )
end

function p.isniLink( id, label )
	id = p.validateIsni( id ) --e.g. 0000-0000-6653-4145
	if not id then
		return false
	end
	return '[https://isni.org/isni/'..id..' '..(label or 'ISNI')..']'..p.getCatForId( 'ISNI' )
end

function p.j9uLink( id, label )
	--P8189's format regex: 9870(0|1)\d{8}05171 (e.g. 987007305652505171)
	if not id:match( '^9870[0-1]%d%d%d%d%d%d%d%d05171$' ) then
		return false
	end
	return '[http://uli.nli.org.il/F/?func=find-b&local_base=NLX10&find_code=UID&request='..id..' '..(label or 'Israel')..']'..p.getCatForId( 'J9U' )
end

function p.jocondeLink( id, label )
	--P347's format regex: [\-0-9A-Za-z]{11} (e.g. 12345678901)
	local regex = '^'..string.rep('[%-0-9A-Za-z]', 11)..'$'
	if not id:match( regex ) then
		return false
	end
	return '[https://www.pop.culture.gouv.fr/notice/joconde/'..id..' '..(label or 'Joconde (France)')..']'..p.getCatForId( 'Joconde' )
end

function p.kulturnavLink( id, label )
	--P1248's format regex: [0-9a-f]{8}\-[0-9a-f]{4}\-[0-9a-f]{4}\-[0-9a-f]{4}\-[0-9a-f]{12} (e.g. 12345678-1234-1234-1234-1234567890AB)
	if not id:match( '^%x%x%x%x%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%x%x%x%x%x%x%x%x$' ) then
		return false
	end
	return '[http://kulturnav.org/'..id..' '..(label or 'KulturNav (Norway)')..']'..p.getCatForId( 'KULTURNAV' ) --no https as of 9/2019
end

function p.lccnLink( id, label )
	local parts = p.splitLccn( id ) --e.g. n78039510
	if not parts then
		return false
	end
	local lccnType = parts[1] ~= 'sh' and 'names' or 'subjects'
	id = parts[1] .. parts[2] .. p.append( parts[3], '0', 6 )
	return '[https://id.loc.gov/authorities/'..lccnType..'/'..id..' '..(label or 'United States')..']'..p.getCatForId( 'LCCN' )
end

function p.lirLink( id, label )
	--P886's format regex: \d+ (e.g. 1)
	if not id:match( '^%d+$' ) then
		return false
	end
	return '[http://www.e-lir.ch/e-LIR___Lexicon.'..id..'.450.0.html '..(label or 'Lexicon Istoric Retic (Switzerland)')..']'..p.getCatForId( 'LIR' ) --no https as of 9/2019
end

function p.lnbLink( id, label )
	--P1368's format regex: \d{9} (e.g. 123456789)
	if not id:match( '^%d%d%d%d%d%d%d%d%d$' ) then
		return false
	end
	return '[https://kopkatalogs.lv/F?func=direct&local_base=lnc10&doc_number='..id..'&P_CON_LNG=ENG '..(label or 'Latvia')..']'..p.getCatForId( 'LNB' )
end

function p.marinaMilitareLink( id, label )
	--P3863's format regex: [1-9]\d* (e.g. 3856)
	if id:match( '^[1-9]%d*$' ) then
		return '[http://www.marina.difesa.it/cosa-facciamo/per-la-difesa-sicurezza/fari/Pagine/'..id..'.aspx '..(label or 'Italy')..']'..p.getCatForId( 'Marina Militare' )
	else
		return false
	end
end

function p.mathsnLink( id, label )
	--P4955's format regex: [1-9]\d{4,6} (e.g. 175270)
	if not id:match( '^[1-9]%d%d%d%d%d?%d?$' ) then
		return false
	end
	return '[https://mathscinet.ams.org/mathscinet/MRAuthorID/'..id..' '..(label or 'MathSciNet')..']'..p.getCatForId( 'MATHSN' )
end

function p.mbaLink( id, label )
	--P434's format regex: [0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12} (e.g. 12345678-1234-1234-1234-1234567890AB)
	if not id:match( '^%x%x%x%x%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%x%x%x%x%x%x%x%x$' ) then
		return false
	end
	local url = 'https://musicbrainz.org/artist/'..id
	local cat = p.getCatForId( 'MusicBrainz' )--special cat name
	if label then
		return '['..url..' '..label..']'..cat
	else
		return '[[MBA (identifier)|MusicBrainz]] ['..url..' artist]'..cat
	end
end

function p.mbareaLink( id, label )
	--P982's format regex: [0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12} (e.g. 12345678-1234-1234-1234-1234567890AB)
	if not id:match( '^%x%x%x%x%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%x%x%x%x%x%x%x%x$' ) then
		return false
	end
	local url = 'https://musicbrainz.org/area/'..id
	local cat = p.getCatForId( 'MusicBrainz area' )--special cat name
	if label then
		return '['..url..' '..label..']'..cat
	else
		return '[[MBAREA (identifier)|MusicBrainz]] ['..url..' area]'..cat
	end
end

function p.mbiLink( id, label )
	--P1330's format regex: [0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12} (e.g. 12345678-1234-1234-1234-1234567890AB)
	if not id:match( '^%x%x%x%x%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%x%x%x%x%x%x%x%x$' ) then
		return false
	end
	local url = 'https://musicbrainz.org/instrument/'..id
	local cat = p.getCatForId( 'MusicBrainz instrument' )--special cat name
	if label then
		return '['..url..' '..label..']'..cat
	else
		return '[[MBI (identifier)|MusicBrainz]] ['..url..' instrument]'..cat
	end
end

function p.mblLink( id, label )
	--P966's format regex: [0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12} (e.g. 12345678-1234-1234-1234-1234567890AB)
	if not id:match( '^%x%x%x%x%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%x%x%x%x%x%x%x%x$' ) then
		return false
	end
	local url = 'https://musicbrainz.org/label/'..id
	local cat = p.getCatForId( 'MusicBrainz label' )--special cat name
	if label then
		return '['..url..' '..label..']'..cat
	else
		return '[[MBL (identifier)|MusicBrainz]] ['..url..' label]'..cat
	end
end

function p.mbpLink( id, label )
	--P1004's format regex: [0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12} (e.g. 12345678-1234-1234-1234-1234567890AB)
	if not id:match( '^%x%x%x%x%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%x%x%x%x%x%x%x%x$' ) then
		return false
	end
	local url = 'https://musicbrainz.org/place/'..id
	local cat = p.getCatForId( 'MusicBrainz place' )--special cat name
	if label then
		return '['..url..' '..label..']'..cat
	else
		return '[[MBP (identifier)|MusicBrainz]] ['..url..' place]'..cat
	end
end

function p.mbrgLink( id, label )
	--P436's format regex: [0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12} (e.g. 12345678-1234-1234-1234-1234567890AB)
	if not id:match( '^%x%x%x%x%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%x%x%x%x%x%x%x%x$' ) then
		return false
	end
	local url = 'https://musicbrainz.org/release-group/'..id
	local cat = p.getCatForId( 'MusicBrainz release group' )--special cat name
	if label then
		return '['..url..' '..label..']'..cat
	else
		return '[[MBRG (identifier)|MusicBrainz]] ['..url..' release group]'..cat
	end
end

function p.mbsLink( id, label )
	--P1407's format regex: [0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12} (e.g. 12345678-1234-1234-1234-1234567890AB)
	if not id:match( '^%x%x%x%x%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%x%x%x%x%x%x%x%x$' ) then
		return false
	end
	local url = 'https://musicbrainz.org/series/'..id
	local cat = p.getCatForId( 'MusicBrainz series' )--special cat name
	if label then
		return '['..url..' '..label..']'..cat
	else
		return '[[MBS (identifier)|MusicBrainz]] ['..url..' series]'..cat
	end
end

function p.mbwLink( id, label )
	--P435's format regex: [0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12} (e.g. 12345678-1234-1234-1234-1234567890AB)
	if not id:match( '^%x%x%x%x%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%-%x%x%x%x%x%x%x%x%x%x%x%x$' ) then
		return false
	end

	local url = 'https://musicbrainz.org/work/'..id
	local cat = p.getCatForId( 'MusicBrainz work' )--special cat name
	if label then
		return '['..url..' '..label..']'..cat
	else
		return '[[MBW (identifier)|MusicBrainz]] ['..url..' work]'..cat
	end
end

function p.mgpLink( id, label )
	--P549's format regex: \d{1,6} (e.g. 123456)
	if not id:match( '^%d%d?%d?%d?%d?%d?$' ) then
		return false
	end
	return '[https://genealogy.math.ndsu.nodak.edu/id.php?id='..id..' '..(label or 'Mathematics Genealogy Project')..']'..p.getCatForId( 'MGP' )
end

function p.mtLink( id, label )
	--P3601's format regex: \d{10} (e.g. 1000004707)
	if id:match( '^%d%d%d%d%d%d%d%d%d%d$' ) then
		return '[https://www.marinetraffic.com/en/ais/details/lights/'..id..' '..(label or 'MarineTraffic')..']'..p.getCatForId( 'MarineTraffic' )
	else
		return false
	end
end

function p.naraLink( id, label )
	--P1225's format regex: ^([1-9]\d{0,8})$ (e.g. 123456789)
	if not id:match( '^[1-9]%d?%d?%d?%d?%d?%d?%d?%d?$' ) then
		return false
	end
	return '[https://catalog.archives.gov/id/'..id..' '..(label or 'National Archives (US)')..']'..p.getCatForId( 'NARA' )
end

function p.nclLink( id, label )
	--P1048's format regex: \d+ (e.g. 1081436)
	if not id:match( '^%d+$' ) then
		return false
	end
	return '[http://aleweb.ncl.edu.tw/F/?func=accref&acc_sequence='..id..'&CON_LNG=ENG '..(label or 'Taiwan')..']'..p.getCatForId( 'NCL' ) --no https as of 9/2019
end

function p.ndlLink( id, label )
	--P349's format regex: 0?\d{8} (e.g. 012345678)
	if not id:match( '^0?%d%d%d%d%d%d%d%d$' ) then
		return false
	end
	return '[https://id.ndl.go.jp/auth/ndlna/'..id..' '..(label or 'Japan')..']'..p.getCatForId( 'NDL' )
end

function p.ngaLink(id,label)
	--P3563's format rgex: 11[0-6]-\d+(\.\d+)? (e.g. 114-7721.2)
	if not id:match('^11[0-6]%-%d+%.?%d*$') then
		return false
	end
	return '[https://wikidata-externalid-url.toolforge.org/?url=https%3A%2F%2Fmsi.nga.mil%2FqueryResults%3Fpublications%2Fngalol%2Flights-buoys%3Fvolume%3D%251%26featureNumber%3D%252%26includeRemovals%3Dfalse%26output%3Dhtml&exp=(%5Cd%7B3%7D)-(.*)&id='..id..' '..(label or 'NGA')..']'..p.getCatForId( 'NGA' )
end

function p.ngvLink( id, label )
	--P2041's format regex: \d+ (e.g. 12354)
	if not id:match( '^%d+$' ) then
		return false
	end
	return '[https://www.ngv.vic.gov.au/explore/collection/artist/'..id..'/ '..(label or 'Victoria')..']'..p.getCatForId( 'NGV' )
end

function p.nkcLink( id, label )
	--P691's format regex: [a-z]{2,4}[0-9]{2,14} (e.g. abcd12345678901234)
	if not id:match( '^[a-z][a-z][a-z]?[a-z]?%d%d%d?%d?%d?%d?%d?%d?%d?%d?%d?%d?%d?%d?$' ) then
		return false
	end
	return '[https://aleph.nkp.cz/F/?func=find-c&local_base=aut&ccl_term=ica='..id..'&CON_LNG=ENG '..(label or 'Czech Republic')..']'..p.getCatForId( 'NKC' )
end

function p.nlaLink( id, label )
	--P409's format regex: [1-9][0-9]{0,11} (e.g. 123456789012)
	if not id:match( '^[1-9]%d?%d?%d?%d?%d?%d?%d?%d?%d?%d?%d?$' ) then
		return false
	end
	return '[https://nla.gov.au/anbd.aut-an'..id..' '..(label or 'Australia')..']'..p.getCatForId( 'NLA' )
end

function p.nlgLink( id, label )
	--P3348's format regex: [1-9]\d* (e.g. 1)
	if not id:match( '^[1-9]%d*$' ) then
		return false
	end
	return '[https://data.nlg.gr/resource/authority/record'..id..' '..(label or 'Greece')..']'..p.getCatForId( 'NLG' )
end

function p.nlkLink( id, label )
	--P5034's format regex: KA.(19|20).{7} (e.g. KAC201501465)
	if not id:match( '^KA.19.......$' ) and
	   not id:match( '^KA.20.......$' ) then
		return false
	end
	return '[https://librarian.nl.go.kr/LI/contents/L20101000000.do?id='..id..' '..(label or 'Korea')..']'..p.getCatForId( 'NLK' )
end

function p.nlpLink( id, label )
	--P1695's format regex: 9810[0-9]\d* or A[0-9]{7}[0-9X] (e.g. 9810123456789012345 or A10414836)
	if not id:match( '^9810%d+$' ) and
	   not id:match( '^A%d%d%d%d%d%d%d[%dX]$' ) then
		return false
	end
	return '[https://tools.wmflabs.org/wikidata-externalid-url?p=1695&id='..id..' '..(label or 'Poland')..']'..p.getCatForId( 'NLP' )
end

function p.nlrLink( id, label )
	--P1003's format regex: \d{9} (e.g. 123456789)
	if not id:match( '^%d%d%d%d%d%d%d%d%d$' ) then
		return false
	end
	return '[http://aleph.bibnat.ro:8991/F/?func=direct&local_base=NLR10&doc_number='..id..' '..(label or 'Romania')..']'..p.getCatForId( 'NLR' )
end

function p.nskLink( id, label )
	--P1375's format regex: \d{9} (e.g. 123456789)
	if not id:match( '^%d%d%d%d%d%d%d%d%d$' ) then
		return false
	end
	return '[http://katalog.nsk.hr/F/?func=direct&doc_number='..id..'&local_base=nsk10 '..(label or 'Croatia')..']'..p.getCatForId( 'NSK' ) --no https as of 9/2019
end

function p.ntaLink( id, label )
	--P1006's format regex: \d{8}[\dX] (e.g. 12345678X)
	if not id:match( '^%d%d%d%d%d%d%d%d[%dX]$' ) then
		return false
	end
	return '[http://data.bibliotheken.nl/id/thes/p'..id..' '..(label or 'Netherlands')..']'..p.getCatForId( 'NTA' )
end

function p.orcidLink( id, label )
	id = p.validateIsni( id ) --e.g. 0000-0002-7398-5483
	if not id then
		return false
	end
	id = id:sub( 1, 4 )..'-'..id:sub( 5, 8 )..'-'..id:sub( 9, 12 )..'-'..id:sub( 13, 16 )
	return '[https://orcid.org/'..id..' '..(label or 'ORCID')..']'..p.getCatForId( 'ORCID' )
end

function p.picLink( id, label )
	--P2750's format regex: [1-9]\d* (e.g. 1)
	if not id:match( '^[1-9]%d*$' ) then
		return false
	end
	return '[https://pic.nypl.org/constituents/'..id..' '..(label or 'Photographers\' Identities')..']'..p.getCatForId( 'PIC' )
end

function p.plwabnLink( id, label )
	--P7293's format regex: 981[0-9]{8}05606 (e.g. 9810696457305606)
	if not id:match( '^981%d%d%d%d%d%d%d%d05606*$' ) then
		return false
	end
	return '[http://mak.bn.org.pl/cgi-bin/KHW/makwww.exe?BM=1&NU=1&IM=4&WI='..id..' '..(label or 'Poland')..']'..p.getCatForId( 'PLWABN' )
end

function p.publonsLink( id, label )
	--P3829's format regex: \d+ (e.g. 654601)
	if not id:match( '^%d+$' ) then
		return false
	end
	return '[https://publons.com/author/'..id..'/ '..(label or 'Publons (researchers)')..']'..p.getCatForId( 'Publons' )
end

function p.ridLink( id, label )
	--P1053's format regex: [A-Z]{1,3}-\d{4}-(19|20)\d\d (e.g. AAS-5150-2020)
	if not id:match( '^[A-Z][A-Z]?[A-Z]?%-%d%d%d%d%-19%d%d$' ) and
	   not id:match( '^[A-Z][A-Z]?[A-Z]?%-%d%d%d%d%-20%d%d$' ) then
		return false
	end
	return '[https://www.researcherid.com/rid/'..id..' '..(label or 'ResearcherID')..']'..p.getCatForId( 'RID' )
end

function p.rismLink( id, label )
	--P5504's format regex: (pe|ks)?\[1-9]d* (e.g. pe30006410)
	if not id:match( '^pe[1-9]%d*$' ) and --99% start with 'pe'
	   not id:match( '^ks[1-9]%d*$' ) and
	   not id:match( '^[1-9]%d*$' ) then
		return false
	end
	return '[https://opac.rism.info/search?id='..id..' '..(label or 'RISM (France)')..']'..p.getCatForId( 'RISM' )
end

function p.reroLink( id, label )
	--P3065's format regex: 0[1-2]-[A-Z0-9]{1,10} (e.g. 02-A012345678)
	if not id:match( '^0[1-2]%-[A-Z%d][A-Z%d]?[A-Z%d]?[A-Z%d]?[A-Z%d]?[A-Z%d]?[A-Z%d]?[A-Z%d]?[A-Z%d]?[A-Z%d]?$' ) then
		return false
	end
	return '[http://data.rero.ch/'..id..' '..(label or 'RERO (Switzerland)')..']'..p.getCatForId( 'RERO' )
end

function p.rkdartistsLink( id, label )
	--P650's format regex: [1-9]\d{0,5} (e.g. 123456)
	if not id:match( '^[1-9]%d?%d?%d?%d?%d?$' ) then
		return false
	end
	return '[https://rkd.nl/en/explore/artists/'..id..' '..(label or 'RKD Artists (Netherlands)')..']'..p.getCatForId( 'RKDartists' )
end

function p.rkdidLink( id, label )
	--P350's format regex: [1-9]\d{0,5} (e.g. 123456)
	if not id:match( '^[1-9]%d?%d?%d?%d?%d?$' ) then
		return false
	end
	return '[https://rkd.nl/nl/explore/images/'..id..' '..(label or 'RKD ID (Netherlands)')..']'..p.getCatForId( 'RKDID' )
end

function p.rslLink( id, label )
	--P947's format regex: \d{1,9} (e.g. 123456789)
	if not id:match( '^%d%d?%d?%d?%d?%d?%d?%d?%d?$' ) then
		return false
	end
	return '[http://aleph.rsl.ru/F?func=find-b&find_code=SYS&adjacent=Y&local_base=RSL11&request='..id..'&CON_LNG=ENG '..(label or 'Russia')..']'..p.getCatForId( 'RSL' ) --no https as of 9/2019
end

function p.scopusLink( id, label )
	--P1153's format regex: [1-9]\d{9,10} (e.g. 35247902700)
	if not id:match( '^[1-9]%d%d%d%d%d%d%d%d%d%d?$' ) then
		return false
	end
	return '[https://www.scopus.com/authid/detail.uri?authorId='..id..' '..(label or 'Scopus author')..']'..p.getCatForId( 'Scopus' )
end

function p.selibrLink( id, label )
	--P906's format regex: [1-9]\d{4,5} (e.g. 123456)
	if not id:match( '^[1-9]%d%d%d%d%d?$' ) then
		return false
	end
	return '[https://libris.kb.se/auth/'..id..' '..(label or 'Sweden')..']'..p.getCatForId( 'SELIBR' )
end

function p.sikartLink( id, label )
	--P781's format regex: \d{7,9} (e.g. 123456789)
	if not id:match( '^%d%d%d%d%d%d%d%d?%d?$' ) then
		return false
	end
	return '[http://www.sikart.ch/KuenstlerInnen.aspx?id='..id..'&lng=en '..(label or 'SIKART (Switzerland)')..']'..p.getCatForId( 'SIKART' ) --no https as of 9/2019
end

function p.snacLink( id, label )
	--P3430's format regex: \d*[A-Za-z][0-9A-Za-z]* (e.g. A)
	if not id:match( '^%d*[A-Za-z][0-9A-Za-z]*$' ) then
		return false
	end
	return '[https://snaccooperative.org/ark:/99166/'..id..' '..(label or 'Social Networks and Archival Context')..']'..p.getCatForId( 'SNAC-ID' )
end

function p.sudocLink( id, label )
	--P269's format regex: (\d{8}[\dX]|) (e.g. 026927608)
	if not id:match( '^%d%d%d%d%d%d%d%d[%dxX]$' ) then --legacy: allow lowercase 'x'
		return false
	end
	return '[https://www.idref.fr/'..id..' '..(label or 'SUDOC (France)')..']'..p.getCatForId( 'SUDOC' )
end

function p.ta98Link( id, label )
	--P1323's format regex: A\d{2}\.\d\.\d{2}\.\d{3}[FM]? (e.g. A12.3.45.678)
	if not id:match( '^A%d%d%.%d%.%d%d%.%d%d%d[FM]?$' ) then
		return false
	end
	local longurl = '[http://tools.wmflabs.org/wikidata-externalid-url/?p=1323&url_prefix=https:%2F%2Fwww.unifr.ch%2Fifaa%2FPublic%2FEntryPage%2FTA98%20Tree%2FEntity%20TA98%20EN%2F&url_suffix=%20Entity%20TA98%20EN.htm&id='
	return longurl..id..' '..(label or 'Terminologia Anatomica')..']'..p.getCatForId( 'TA98' )
end

function p.tdviaLink( id, label )
	--P7314's format regex: [0-9a-z/-]+] (e.g. barkan-omer-lutfi)
	if not id:match( '^[%d%l/-]+$' ) then
		return false
	end
	return '[https://islamansiklopedisi.org.tr/'..id..' '..(label or 'İslâm Ansiklopedisi')..']'..p.getCatForId( 'TDVİA' )
end

function p.tepapaLink( id, label )
	--P3544's format regex: \d+ (e.g. 1)
	if not id:match( '^%d+$' ) then
		return false
	end
	return '[https://collections.tepapa.govt.nz/agent/'..id..' '..(label or 'Te Papa (New Zealand)')..']'..p.getCatForId( 'TePapa' )
end

function p.tlsLink( id, label )
	id = id:gsub(' +', '_')
	--P1362's format regex: \p{Lu}[\p{L}\d_',\.\-\(\)\*\/–&]{3,89} (e.g. Abcd)
	--Mediawiki page title partial URL so consider validation with mw.title or "[^#<>%[%] {|}]"
	local class = "[%w_',%.%-%(%)%*%/–&]"
	local idlen = mw.ustring.len (id)
	if idlen < 4 or idlen > 90 then
		return false
	end
	local regex = '^%u'..string.rep(class, idlen - 1)..'$'
	if not mw.ustring.match( id, regex ) then
		return false
	end
	return '[http://tls.theaterwissenschaft.ch/wiki/'..id..' '..(label or 'Theaterlexikon (Switzerland)')..']'..p.getCatForId( 'TLS' ) --no https as of 9/2019
end

function p.troveLink( id, label )
	--P1315's format regex: [1-9]\d{5,7} (e.g. 12345678)
	if not id:match( '^[1-9]%d%d%d%d%d%d?%d?$' ) then
		return false
	end
	return '[https://trove.nla.gov.au/people/'..id..' '..(label or 'Trove (Australia)')..']'..p.getCatForId( 'Trove' )
end

function p.ukparlLink( id, label )
	--P6213's format regex: [a-zA-Z\d]{8} (e.g. AQUupyiR)
	if not id:match( '^[a-zA-Z%d][a-zA-Z%d][a-zA-Z%d][a-zA-Z%d][a-zA-Z%d][a-zA-Z%d][a-zA-Z%d][a-zA-Z%d]$' ) then
		return false
	end
	return '[https://id.parliament.uk/'..id..' '..(label or 'UK Parliament')..']'..p.getCatForId( 'UKPARL' )
end

function p.ulanLink( id, label )
	--P245's format regex: 500\d{6} (e.g. 500123456)
	if not id:match( '^500%d%d%d%d%d%d$' ) then
		return false
	end
	return '[https://www.getty.edu/vow/ULANFullDisplay?find=&role=&nation=&subjectid='..id..' '..(label or 'Artist Names (Getty)')..']'..p.getCatForId( 'ULAN' )
end

function p.uscgLink( id, label )
	--P3723's format regex: [1-7]-\d{1,5}(.[1-9])? (e.g. 6-0695)
	if not id:match( '^[1-7]%-%d%d?%d?%d?%d?$' ) and
	   not id:match( '^[1-7]%-%d%d?%d?%d?%d?%.%d*[1-9]$' ) then
		return false
	end
	return '[[USCG (identifier)|USCG]] ([https://www.navcen.uscg.gov/pdf/lightlists/LightList_V'..mw.ustring.sub(id,1,1)..'_2021.pdf '..id..'])'..p.getCatForId( 'USCG' )
end

function p.uscongressLink( id, label )
	--P1157's format regex: [A-Z]00[01]\d{3} (e.g. A000123)
	if not id:match( '^[A-Z]00[01]%d%d%d$' ) then
		return false
	end
	return '[http://bioguide.congress.gov/scripts/biodisplay.pl?index='..id..' '..(label or 'US Congress')..']'..p.getCatForId( 'USCongress' ) --no https as of 9/2019
end

function p.vcbaLink( id, label )
	--P8034's format regex: \d{3}\/[1-9]\d{0,5} (e.g. 494/9793)
	if not id:match( '^%d%d%d\/[1-9]%d?%d?%d?%d?%d?$' ) then
		return false
	end
	id = id:gsub('\/', '_')
	return '[https://opac.vatlib.it/auth/detail/'..id..' '..(label or 'Vatican')..']'..p.getCatForId( 'VcBA' )
end

function p.viafLink( id, label )
	--P214's format regex: [1-9]\d(\d{0,7}|\d{17,20}) (e.g. 123456789, 1234567890123456789012)
	if not id:match( '^[1-9]%d%d?%d?%d?%d?%d?%d?%d?$' ) and
	   not id:match( '^[1-9]%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d?%d?%d?$' ) then
		return false
	end
	-- If the "VIAF" entry at [[:m:Interwiki map]] would resolve to "https://viaf.org/viaf/$1" (rather than "http://viaf.org/viaf/$1", as it currently still does),
	-- then the code below could change from '[https://viaf.org/viaf/'..id..' '..id..']' to '[[:VIAF:'..id..'|'..id..']]'.
	return '[https://viaf.org/viaf/'..id..' '..(label or 'VIAF')..']'..p.getCatForId( 'VIAF' )
end

function p.worldcatidLink( id, label )
	--P7859's format regex: viaf-\d+|lccn-n[a-z]?[0-9\-]+|n[cps]-.+ (e.g. viaf-100181709, lccn-n78-95332, np-verbeck,%20william$1861)
	if not id:match( '^viaf%-%d+$' ) and
	   not id:match( '^lccn%-n[a-z]?[0-9%-]+$' ) and
	   not id:match( '^n[cps]%-.+$' ) then
		return false
	end
	return '[https://www.worldcat.org/identities/'..mw.uri.encode(id, 'PATH')..'/ '..(label or 'WorldCat')..']'..p.getCatForId( 'WORLDCATID' )
end

function p.zbmathLink( id, label )
	--P1556's format regex: [a-z][a-z\-]*(\.[a-z][a-z\-]*)?(\.[0-9]*)? (e.g. turing.alan-m)
	local ps = {'%l[%l%-]*', '%.%l[%l%-]*', '%.%d*'}
	if not id:match( '^'..ps[1]..'$' ) and -- prefix with no capture options
	   not id:match( '^'..ps[1]..ps[2]..'$' ) and -- prefix with first capture option
	   not id:match( '^'..ps[1]..ps[3]..'$' ) and -- prefix with second capture option
	   not id:match( '^'..ps[1]..ps[2]..ps[3]..'$' ) then -- prefix and both capture options
		return false
	end
	return '[https://zbmath.org/authors/?q=ai:'..id..' '..(label or 'zbMATH')..']'..p.getCatForId( 'ZBMATH' )
end

--[[=========================== Helper functions =============================]]

function p.append(str, c, length)
	while str:len() < length do
		str = c..str
	end
	return str
end

--Returns the ISNI check digit isni must be a string where the 15 first elements are digits, e.g. 0000000066534145
function p.getIsniCheckDigit( isni )
	local total = 0
	for i = 1, 15 do
		local digit = isni:byte( i ) - 48 --Get integer value
		total = (total + digit) * 2
	end
	local remainder = total % 11
	local result = (12 - remainder) % 11
	if result == 10 then
		return 'X'
	end
	return tostring( result )
end

--Validate ISNI (and ORCID) and retuns it as a 16 characters string or returns false if it's invalid
--See http://support.orcid.org/knowledgebase/articles/116780-structure-of-the-orcid-identifier
function p.validateIsni( id )
	--P213 (ISNI) format regex: [0-9]{4} [0-9]{4} [0-9]{4} [0-9]{3}[0-9X] (e.g. 0000-0000-6653-4145)
	--P496 (ORCID) format regex: 0000-000(1-[5-9]|2-[0-9]|3-[0-4])\d{3}-\d{3}[\dX] (e.g. 0000-0002-7398-5483)
	id = id:gsub( '[ %-]', '' ):upper()
	if not id:match( '^%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d[%dX]$' ) then
		return false
	end
	if p.getIsniCheckDigit( id ) ~= string.char( id:byte( 16 ) ) then
		return false
	end
	return id
end

function p.splitLccn( id )
	--P244's format regex: (n|nb|nr|no|ns|sh)([4-9][0-9]|00|20[0-1][0-9])[0-9]{6} (e.g. n78039510)
	if id:match( '^%l%l?%l?%d%d%d%d%d%d%d%d%d?%d?$' ) then
		id = id:gsub( '^(%l+)(%d+)(%d%d%d%d%d%d)$', '%1/%2/%3' )
	end
	if id:match( '^%l%l?%l?/%d%d%d?%d?/%d+$' ) then
		return mw.text.split( id, '/' )
	end
	return false
end

--[[==========================================================================]]
--[[                    Wikidata & documentation functions                    ]]
--[[==========================================================================]]

function p.getIdsFromWikidata( itemId, property )
	local ids = {}
	if not mw.wikibase then
		return ids
	end
	local statements = mw.wikibase.getBestStatements( itemId, property )
	if statements then
		for _, statement in ipairs( statements ) do
			if statement.mainsnak.datavalue then
				table.insert( ids, statement.mainsnak.datavalue.value )
			end
		end
	end
	return ids
end

function p.checkcat( category,label )
	local ret='[[:Category:'..category..'|'..label..']]'
	if mw.title.new(category, 14).exists == false then
		ret = ret..' <span class="plainlinks" style="font-size:85%;">&#91;['..tostring(mw.uri.fullUrl('Category:'..category,'action=edit&preload=Template:Authority_control/preload'))..' create]&#93;</span>'
	end
	return ret
end

-- Creates a human-readable standalone wikitable version of p.conf, and tracking categories with page counts, for use in the documentation
function p.docConfTable( frame )
	local wikiTable = '<table class="wikitable sortable">'..
	  '<tr><th rowspan=2>Parameter</th>'..
	  '<th rowspan=2>Section</th>'..
	  '<th rowspan=2>Appears as</th>'..
	  '<th rowspan=2 data-sort-type=number>Wikidata property</th>'..
	  '<th colspan=2>Tracking categories and page counts</th></tr>'..
	  '<tr><th>[[:Category:Articles with authority control information|Articles]]</th>'..
	  '<th>[[:Category:Articles with faulty authority control information|Faulty IDs]]</th></tr>'
	local lang = mw.getContentLanguage()
	local a, f, P = 0, 0, 0 --cumulative sums
	for _, conf in pairs( p.conf ) do
		local param, pid, section = conf[1], conf[2], conf[4]
		local appearsAs
		if conf.prefix then
			appearsAs = conf.prefix
		else
			appearsAs = conf[3](conf[5])
		end
		local link = conf.link or param..' (identifier)'
		local category = conf.category or param
		local args = { id = 'f', pid }
		local wpl = frame:expandTemplate{ title = 'Wikidata property link', args = args }
		--cats
		local articleCat = 'Articles with '..category..' identifiers'
		local faultyCat =  'Articles with faulty '..category..' identifiers'
		--counts
		local articleCount = lang:formatNum( mw.site.stats.pagesInCategory(articleCat, 'pages') )
		local faultyCount =  lang:formatNum( mw.site.stats.pagesInCategory(faultyCat, 'pages') )
		--calcs
		P = P + 1 --property count
		a = a + lang:parseFormattedNumber(articleCount)
		f = f + lang:parseFormattedNumber(faultyCount)
		--concat
		wikiTable = wikiTable..'<tr><td>[['..link..'|'..param..']]</td>'..
			'<td>'..section..'</td>'..
			'<td>'..appearsAs..'</td>'..
			'<td data-sort-value='..pid..'>'..wpl..'</td>'..
			'<td style="text-align: right;">'..p.checkcat(articleCat,articleCount)..'</td>'..
			'<td style="text-align: right;">'..p.checkcat(faultyCat,faultyCount)..'</td></tr>'
	end

	--append derivative WorldCat cats
	local wcd = { 'WorldCat-LCCN', 'WorldCat-VIAF' }
	for _, w in pairs(wcd) do
		local articleCat = 'Articles with '..w..' identifiers'
		local articleCount = lang:formatNum( mw.site.stats.pagesInCategory(articleCat, 'pages') )
		local appearsAs
		if w == 'WorldCat-LCCN' then
			appearsAs = '[https://www.worldcat.org/identities/lccn-n79-113947 WorldCat (via Library of Congress)]'
		else
			appearsAs = '[https://www.worldcat.org/identities/containsVIAFID/12345789 WorldCat (via VIAF)]'
		end
		a = a + lang:parseFormattedNumber(articleCount)
		wikiTable = wikiTable..'<tr><td>-</td>'..
			'<td>General</td>'..
			'<td>'..appearsAs..'</td>'..
			'<td data-sort-value='..w..'>—</td>'..
			'<td style="text-align: right;">[[:Category:'..articleCat..'|'..articleCount..']]</td>'..
			'<td style="text-align: right;">—</td></tr>'
	end

	--append sums
	wikiTable = wikiTable..'<tr><th style="text-align: right;" colspan=3>Totals</th>'..
		'<th style="text-align: right;">'..lang:formatNum(P)..'</th>'..
		'<th style="text-align: right;">'..lang:formatNum(a)..'</th>'..
		'<th style="text-align: right;">'..lang:formatNum(f)..'</th></tr></table>'

	return require('Module:Suppress categories').main(wikiTable)
end

--[[==========================================================================]]
--[[                              Configuration                               ]]
--[[==========================================================================]]

-- Please use "<parameter> (identifier)" redirects rather than linking directly to the target page.
-- This reduces clutter in "What links here" on both the redirect and the target,
-- and improves reverse lookup of articles where a manifestation of each identifier is used.

-- p.conf table basic format: { 'parameter name', propertyId # in Wikidata, formatting/validation function, section, example ID for documentation }
-- p.conf table optional named parameters:
--  link: to override the link in the documentation (defaults to "<parameter> (identifer)")
--  category: to override the ID in category names (defaults to "... with <parameter> identifiers")
--  prefix: to include a prefix (usually a wikilink explaining what the identifier is) before the external link itself
p.conf = {
	{ 'AAG', 3372, p.aagLink, 'Art galleries and museums', '1' },
	{ 'ACM-DL', 864, p.acmLink, 'Scientific databases', '12345678901', link = 'ACM DL (identifier)' },
	{ 'ADB', 1907, p.adbLink,'Biographical dictionaries', 'barton-sir-edmund-toby-71' },
	{ 'admiralty', 3562, p.admiraltyLink, 'Lighthouse identifiers', 'D1204.1', prefix='[[Admiralty number|Admiralty]]'},
	{ 'AGSA', 6804, p.agsaLink, 'Art galleries and museums', '3625' },
	{ 'ARLHS', 2980, p.ARLHSLink, 'Lighthouse identifiers', 'LAT023'},
	{ 'autores.uy', 2558, p.autoresuyLink, 'Biographical dictionaries', '12345' },
	{ 'AWR', 4186, p.awrLink, 'Biographical dictionaries', 'PR00768b' },
	{ 'BIBSYS', 1015, p.bibsysLink, 'National libraries', '1234567890123' },
	{ 'Bildindex', 2092, p.bildLink, 'Art research institutes', '1' },
	{ 'BNC', 1890, p.bncLink, 'National libraries', '123456789' },
	{ 'BNE', 950, p.bneLink, 'National libraries', 'XX1234567' },
	{ 'BNF', 268, p.bnfLink, 'National libraries', '123456789' },
	{ 'BNMM', 3788, p.bnmmLink, 'National libraries', '000024044' },
	{ 'Botanist', 428, p.botanistLink , 'Scientific databases', 'L.' },
	{ 'BPN', 651, p.bpnLink , 'Biographical dictionaries', '12345678' },
	{ 'CANTIC', 1273, p.canticLink, 'National libraries', 'a12345678' },
	{ 'CANTICN', 9984, p.canticnLink, 'National libraries', '981058515460906706' },
	{ 'CCG', 3920, p.ccgLink, 'Lighthouse identifiers', 'A1761', prefix='[[CCG (identifier)|CCG]]' },
	{ 'CINII', 271, p.ciniiLink, 'Scientific databases', 'DA12345678', link = 'CiNii (identifier)' },
	{ 'CWGC', 1908, p.cwgcLink, 'Other', '1234567' },
	{ 'DAAO', 1707, p.daaoLink, 'Art research institutes', 'rolf-harris' },
	{ 'DBLP', 2456, p.dblpLink, 'Scientific databases', '123/123' },
	{ 'DIB',  6829, p.dibLink, 'Biographical dictionaries', 'a1234' },
	{ 'DSI', 2349, p.dsiLink, 'Art research institutes', '1538' },
	{ 'DTBIO', 7902, p.dtbioLink, 'Biographical dictionaries', '118554700' },
	{ 'EMU', 4613, p.emuLink, 'National libraries', '15409' },
	{ 'FAST', 2163, p.fastLink, 'Other', '1' },
	{ 'FNZA', 6792, p.fnzaLink, 'Art research institutes', '12' },
	{ 'GND', 227, p.gndLink, 'National libraries', '4079154-3' },
	{ 'Google Scholar', 1960, p.googleLink, 'Scientific databases', 'QPdLuj8AAAAJ' },
	{ 'HDS', 902, p.hdsLink, 'Other', '050123' },
	{ 'IAAF', 1146, p.iaafLink, 'Other', '123' },
	{ 'ICCU', 396, p.iccuLink, 'National libraries', 'CFIV000163' }, --formerly SBN
	{ 'ICIA', 1736, p.iciaLink, 'Art research institutes', '1' },
	{ 'IEU', 9070, p.ieuLink, 'Other', 'N\\A\\NationalAcademyofArtandArchitecture' },
	{ 'ISNI', 213, p.isniLink, 'General', '0000-0000-6653-4145', prefix = '[[ISNI (identifier)|ISNI]]' },
	{ 'J9U', 8189, p.j9uLink, 'National libraries', '987007305652505171' },
	{ 'Joconde', 347, p.jocondeLink, 'Art research institutes', '12345678901' },
	{ 'KULTURNAV', 1248, p.kulturnavLink, 'Art research institutes', '12345678-1234-1234-1234-1234567890AB', link = 'KulturNav (identifier)' },
	{ 'LCCN', 244, p.lccnLink, 'National libraries', 'n78039510' },
	{ 'LIR', 886, p.lirLink, 'Other', '1' },
	{ 'LNB', 1368, p.lnbLink, 'National libraries', '123456789' },
	{ 'Marina Militare', 3863, p.marinaMilitareLink, 'Lighthouse identifiers', '3856' },
	{ 'MarineTraffic', 3601, p.mtLink, 'Lighthouse identifiers', '1000004707' },
	{ 'MATHSN', 4955, p.mathsnLink, 'Scientific databases', '175270' },
	{ 'MBA', 434, p.mbaLink, 'Other', '12345678-1234-1234-1234-1234567890AB', category = 'MusicBrainz' }, --special cat name
	{ 'MBAREA', 982, p.mbareaLink, 'Other', '12345678-1234-1234-1234-1234567890AB', category = 'MusicBrainz area' }, --special cat name
	{ 'MBI', 1330, p.mbiLink, 'Other', '12345678-1234-1234-1234-1234567890AB', category = 'MusicBrainz instrument' }, --special cat name
	{ 'MBL', 966, p.mblLink, 'Other', '12345678-1234-1234-1234-1234567890AB', category = 'MusicBrainz label' }, --special cat name
	{ 'MBP', 1004, p.mbpLink, 'Other', '12345678-1234-1234-1234-1234567890AB', category = 'MusicBrainz place' }, --special cat name
	{ 'MBRG', 436, p.mbrgLink, 'Other', '12345678-1234-1234-1234-1234567890AB', category = 'MusicBrainz release group' }, --special cat name
	{ 'MBS', 1407, p.mbsLink, 'Other', '12345678-1234-1234-1234-1234567890AB', category = 'MusicBrainz series' }, --special cat name
	{ 'MBW',  435, p.mbwLink, 'Other', '12345678-1234-1234-1234-1234567890AB', category = 'MusicBrainz work' }, --special cat name
	{ 'MGP', 549, p.mgpLink, 'Scientific databases', '123456' },
	{ 'NARA', 1225, p.naraLink, 'Other', '12345678' },
	{ 'NCL', 1048, p.nclLink, 'National libraries', '1081436' },
	{ 'NDL', 349, p.ndlLink, 'National libraries', '012345678' },
	{ 'NGA', 3563, p.ngaLink, 'Lighthouse identifiers', '114-5592'},
	{ 'NGV', 2041, p.ngvLink, 'Art galleries and museums', '12354' },
	{ 'NKC', 691, p.nkcLink, 'National libraries', 'abcd12345678901234' },
	{ 'NLA', 409, p.nlaLink, 'National libraries', '123456789012' },
	{ 'NLG', 3348, p.nlgLink, 'National libraries', '12345678' },
	{ 'NLK', 5034, p.nlkLink, 'National libraries', 'KAB197000000' },
	{ 'NLP', 1695, p.nlpLink, 'National libraries', '9810123456789012345' },
	{ 'NLR', 1003, p.nlrLink, 'National libraries', '123456789' },
	{ 'NSK', 1375, p.nskLink, 'National libraries', '123456789' },
	{ 'NTA', 1006, p.ntaLink, 'National libraries', '12345678X' },
	{ 'ORCID', 496, p.orcidLink, 'General', '0000-0002-7398-5483', prefix = '[[ORCID (identifier)|ORCID]]' },
	{ 'PIC', 2750, p.picLink, 'Art research institutes', '1' },
	{ 'PLWABN',  7293, p.plwabnLink, 'National libraries', '9812345678905606' },
	{ 'Publons', 3829, p.publonsLink, 'Scientific databases', '2776255' },
	{ 'RID', 1053, p.ridLink, 'Scientific databases', 'A-1234-1934' },
	{ 'RISM', 5504, p.rismLink, 'Other', 'pe1',  prefix = '[[RISM (identifier)|RISM (France)]]' },
	{ 'RERO', 3065, p.reroLink, 'Other', '02-A012345678', prefix = '[[RERO (identifier)|RERO (Switzerland)]]' },
	{ 'RKDartists', 650, p.rkdartistsLink, 'Art research institutes', '123456' },
	{ 'RKDID', 350, p.rkdidLink, 'Art research institutes', '123456' },
	{ 'RSL', 947, p.rslLink, 'National libraries', '123456789' },
	{ 'Scopus', 1153, p.scopusLink, 'Scientific databases', '7005487412' },
	{ 'SELIBR', 906, p.selibrLink, 'National libraries', '123456' },
	{ 'SIKART', 781, p.sikartLink, 'Art research institutes', '123456789' },
	{ 'SNAC-ID', 3430, p.snacLink, 'Other', 'A' },
	{ 'SUDOC', 269, p.sudocLink, 'Other', '026927608', prefix = '[[SUDOC (identifier)|SUDOC (France)]]' },
	{ 'TA98', 1323, p.ta98Link, 'Scientific databases', 'A12.3.45.678' },
	{ 'TDVİA', 7314, p.tdviaLink, 'Other', 'asim-b-behdele' },
	{ 'TePapa', 3544, p.tepapaLink, 'Art galleries and museums', '1' },
	{ 'TLS',  1362, p.tlsLink, 'Other', 'Abcd' },
	{ 'Trove', 1315, p.troveLink, 'Other', '12345678', prefix = '[[Trove (identifier)|Trove (Australia)]]' }, --formerly NLA-person
	{ 'UKPARL', 6213, p.ukparlLink, 'Other', 'AQUupyiR' },
	{ 'ULAN', 245, p.ulanLink, 'Art research institutes', '500123456' },
	{ 'USCG', 3723, p.uscgLink, 'Lighthouse identifiers', '6-0695'},
	{ 'USCongress', 1157, p.uscongressLink, 'Other', 'A000123', link = 'US Congress (identifier)' },
	{ 'VcBA', 8034, p.vcbaLink, 'National libraries', '494/9793' },
	{ 'VIAF', 214, p.viafLink, 'General', '123456789', prefix = '[[VIAF (identifier)|VIAF]]' },
	{ 'WORLDCATID', 7859, p.worldcatidLink, 'General', 'lccn-n78-95332', link = 'WorldCat Identities (identifier)' },
	{ 'ZBMATH', 1556, p.zbmathLink, 'Scientific databases', 'turing.alan-m' },
}

-- Legitimate aliases to p.conf, for convenience
-- Format: { 'alias', 'parameter name in p.conf' }
p.aliases = {
	{ 'DNB', 'GND' }, --Deutsche Nationalbibliothek -> Gemeinsame Normdatei
	{ 'MusicBrainz', 'MBA' },
	{ 'MusicBrainz artist', 'MBA' },
	{ 'MusicBrainz label', 'MBL' },
	{ 'MusicBrainz release group', 'MBRG' },
	{ 'MusicBrainz work', 'MBW' },
	{ 'SBN', 'ICCU' }, --SBN alias to be deprecated at a later stage
	{ 'TDVIA', 'TDVİA' }, --alias name without diacritics
	{ 'tdvia', 'TDVİA' }, --lowercase variant without diacritics
}

-- Deprecated aliases to p.conf; tracked in [[Category:Articles with deprecated authority control identifiers]]
-- Format: { 'deprecated parameter name', 'replacement parameter name in p.conf' }
p.deprecated = {
	{ 'GKD', 'GND' },
	{ 'PND', 'GND' },
	{ 'RLS', 'RSL' },
	{ 'SWD', 'GND' },
	{ 'NARA-organization', 'NARA' },
	{ 'NARA-person', 'NARA' },
}

--[[==========================================================================]]
--[[                                   Main                                   ]]
--[[==========================================================================]]

function p.authorityControl( frame )
	local resolveEntity = require( 'Module:ResolveEntityId' )
	local parentArgs = frame:getParent().args --WD IDs added here later
	local iParentArgs = 0 --count original/manual parent args only later
	local worldcatCat = ''
	local elementsCat = ''
	local multipleIdCat = ''
	local suppressedIdCat = ''
	local suppressedIdCatArts = ''
	local deprecatedIdCat = ''
	local differentOnWDCat = ''
	local sameOnWDCat = ''
	local stateCat = ''

	--redirect aliases to proper parameter names
	for _, a in pairs( p.aliases ) do
		local alias, param = a[1], a[2]
		if (parentArgs[param] == nil or parentArgs[param] == '') and parentArgs[alias] then
			parentArgs[param] = parentArgs[alias]
		end
	end

	--redirect deprecated parameters to proper parameter names, and assign tracking cat
	for _, d in pairs( p.deprecated ) do
		local dep, param = d[1], d[2]
		if (parentArgs[param] == nil or parentArgs[param] == '') and parentArgs[dep] then
			parentArgs[param] = parentArgs[dep]
			if namespace == 0 then
				deprecatedIdCat = '[[Category:Articles with deprecated authority control identifiers|'..dep..']]'
			end
		end
	end

	--use QID= parameter for testing/example purposes only
	local itemId = nil
	if namespace ~= 0 then
		local qid = parentArgs['qid'] or parentArgs['QID']
		if qid then
			itemId = 'Q'..mw.ustring.gsub(qid, '^[Qq]', '')
			itemId = resolveEntity._id(itemId) --nil if unresolvable
		end
	elseif mw.wikibase then
		itemId = mw.wikibase.getEntityIdForCurrentPage()
	end

	--Wikidata fallback if available
	if itemId then
		local suppressedIdCount = 0
		local iMatches = 0
		for _, params in ipairs( p.conf ) do
			if params[2] > 0 then
				local val = parentArgs[mw.ustring.lower(params[1])] or parentArgs[params[1]]
				if val == nil or val == '' then
					local wikidataIds = p.getIdsFromWikidata( itemId, 'P'..params[2] )
					if wikidataIds[1] then
						if val == '' and (namespace == 0 or testcases) then
							suppressedIdCount = suppressedIdCount + 1
							suppressedIdCat = '[[Category:Articles with suppressed authority control identifiers|'..params[1]..']]'
						else
							parentArgs[params[1]] = wikidataIds[1] --add ID from WD
						end
					end
				else
					iParentArgs = iParentArgs + 1
					local wikidataIds = p.getIdsFromWikidata( itemId, 'P'..params[2] )
					if wikidataIds[1] and differentOnWDCat == '' then
						local bMatch = false
						for _, wd in pairs( wikidataIds ) do
							if val == wd then
								iMatches = iMatches + 1
								bMatch = true
							end
						end
						if bMatch == false then
							differentOnWDCat = '[[Category:Pages using authority control with parameters different on Wikidata|'..params[1]..']]'
		end	end	end	end	end
		if iMatches > 0 and iMatches == iParentArgs then
			sameOnWDCat = '[[Category:Pages using authority control with parameters all matching Wikidata]]'
		end
		if parentArgs['arts'] == 'arts' and suppressedIdCount > 0 then
			if namespace == 0 or testcases then
				local s = 's'
				if suppressedIdCount == 1 then s = '' end
				local sCat = 'ACArt with '..suppressedIdCount..' suppressed element'..s
				suppressedIdCatArts = addCat(sCat)
			end
		end
	end

	--configure rows
	local rct = 0
	local sectionOrder = {
		'General',
		'National libraries',
		'Art galleries and museums',
		'Art research institutes',
		'Biographical dictionaries',
		'Scientific databases',
		'Lighthouse identifiers',
		'Other'
	}
	local sections = {
		['General'] = {},
		['National libraries'] = {},
		['Art galleries and museums'] = {},
		['Art research institutes'] = {},
		['Biographical dictionaries'] = {},
		['Scientific databases'] = {},
		['Lighthouse identifiers'] = {},
		['Other'] = {}
	}
	--don't show CANTIC if CANTICN is present, since they both go to the Library of Catalonia
	--and the library has deprecated CANTIC IDs in favor of CANTICN IDs
	if parentArgs.CANTICN or parentArgs.canticn then
		parentArgs.CANTIC = ''
		parentArgs.cantic = ''
	end
	--don't show NLP if PLWABN is present, since they both go to the National Library of Poland
	--and the library has deprecated NLP IDs in favor of PLWABN IDs
	if parentArgs.PLWABN or parentArgs.plwabn then
		parentArgs.NLP = ''
		parentArgs.nlp = ''
	end
	for _, params in ipairs( p.conf ) do
		local val = parentArgs[mw.ustring.lower(params[1])] or parentArgs[params[1]]
		local tval, tlinks = {}, {} --init tables
		if val and val ~= '' and type(params[3]) == 'function' then
			table.insert( tval, val )
			if params.prefix then
				table.insert( tlinks, params[3]( val, '1' ) )
			else
				table.insert( tlinks, params[3]( val ) )
			end
		end
		--collect other unique vals (IDs) from WD, if present
		if itemId and tval[1] then
			local nextIdVal = 2
			local wikidataIds = p.getIdsFromWikidata( itemId, 'P'..params[2] )
			for _, v in pairs( wikidataIds ) do
				local bnew = true
				for _, w in pairs( tval ) do
					if v == w then bnew = false end
				end
				if bnew then
					table.insert( tval, v )
					table.insert( tlinks, params[3]( v, tostring(nextIdVal) ) )
					nextIdVal = nextIdVal + 1
				end
			end
		end
		--assemble
		if tval[1] then
			table.insert( sections[params[4]], p.createRow( params[1], tval, nil, tlinks, true, params.category, params.prefix) )
			rct = rct + 1
			if tval[2] then
				multipleIdCat = p.getCatForId( 'multiple' )
			end
		end

	end

	--WorldCat-VIAF & WorldCat-LCCN
	local worldcatId = parentArgs['worldcatid'] or parentArgs['WORLDCATID']
	if worldcatId == nil then --if WORLDCATID absent but unsuppressed
		local viafId = parentArgs['viaf'] or parentArgs['VIAF']
		local lccnId = parentArgs['lccn'] or parentArgs['LCCN']
		if viafId and viafId ~= '' and p.viafLink( viafId ) then --VIAF must be present, unsuppressed, & validated
			table.insert( sections['General'], p.createRow( 'VIAF', viafId, '[https://www.worldcat.org/identities/containsVIAFID/'..viafId..' WorldCat (via VIAF)]', nil, false ) )
			if namespace == 0 then
				worldcatCat = '[[Category:Articles with WorldCat-VIAF identifiers]]'
			end
			rct = rct + 1
		elseif lccnId and lccnId ~= '' and p.lccnLink( lccnId ) then --LCCN must be present, unsuppressed, & validated
			local lccnParts = p.splitLccn( lccnId )
			if lccnParts and lccnParts[1] ~= 'sh' then
				local lccnIdFmtd = lccnParts[1]..lccnParts[2]..'-'..lccnParts[3]
				table.insert( sections['General'], p.createRow( 'LCCN', lccnId, '[https://www.worldcat.org/identities/lccn-'..lccnIdFmtd..' WorldCat (via Library of Congress)]', nil, false ) )
				if namespace == 0 then
					worldcatCat = '[[Category:Articles with WorldCat-LCCN identifiers]]'
				end
			end
			rct = rct + 1
		end
	end

	--configure Navbox
	local outString = ''
	local extrap = true
	local extra = parentArgs.extralist
	if extra == nil or extra == '' then
		extrap = false
	end
	if rct > 0 or extrap then
		local Navbox = require('Module:Navbox')
		local sectionID = 1
		local args = { pid = 'identifiers' } -- #target the list of identifiers
		if testcases and itemId then args.qid = itemId end --expensive
		local pencil = require('Module:EditAtWikidata')._showMessage(args)
		local navboxArgs = {
			name  = 'Authority control',
			navboxclass = 'authority-control',
			bodyclass = 'hlist',
			state = parentArgs.state or 'autocollapse',
			navbar = 'off'
		}
		for _, sectName in ipairs(sectionOrder) do
			if #sections[sectName] ~= 0 then
				navboxArgs['group'..sectionID] = sectName
				navboxArgs['list'..sectionID] = table.concat(sections[sectName])
				sectionID = sectionID + 1
			end
		end
		if extrap then
			if parentArgs.extragroup then
				navboxArgs['group'..sectionID] = parentArgs.extragroup
			else
				navboxArgs['group'..sectionID] = 'Additional'
			end
			navboxArgs['list'..sectionID] = extra
			sectionID = sectionID + 1
		end
		if navboxArgs.list2 then
			navboxArgs.title = '[[Help:Authority control|Authority control]]'..pencil
		else
			local sect = navboxArgs.group1
			if sect == 'General' or sect == 'Other' or sect == 'Additional' then
				-- Just say "Authority control" with no label if only general or only other IDs are present
				-- since "general" is redundant and "other" is silly when there's nothing to contrast it with
				navboxArgs.group1 = '[[Help:Authority control|Authority control]]'..pencil
			else
				navboxArgs.group1 = '[[Help:Authority control|Authority control: '..sect..']] '..pencil
			end
		end
		outString = Navbox._navbox(navboxArgs)
	end

	--auxCats
	if rct == 0 or rct >= 25 then
		if namespace == 0 or testcases then
			local eCat = 'AC with '..rct..' elements'
			elementsCat = addCat(eCat)
		end
	end
	if parentArgs.state then
		if namespace == 0 or testcases then
			local sCat
			if parentArgs.state == 'collapsed' then sCat = 'AC using state parameter: collapsed'
			elseif parentArgs.state == 'expanded' then sCat = 'AC using state parameter: expanded'
			elseif parentArgs.state == 'autocollapse' then sCat = 'AC using state parameter: autocollapse'
			else sCat = 'AC using state parameter: other'
			end
			stateCat = addCat(sCat)
		end
	end
	local auxCats = worldcatCat..elementsCat..multipleIdCat..suppressedIdCat..suppressedIdCatArts..
					deprecatedIdCat..differentOnWDCat..sameOnWDCat..stateCat
	if testcases then
		auxCats = mw.ustring.gsub(auxCats, '(%[%[)(Category)', '%1:%2') --for easier checking
	end

	--out
	outString = outString..auxCats
	if namespace ~= 0 then
		outString = mw.ustring.gsub(outString, '(%[%[)(Category:Articles)', '%1:%2') --by definition
	end

	return outString
end

return p
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