Módulo:WikidataIB/Testes

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Alpha lowercase.svg Este módulo está classificado como alfa. Ele está pronto para aceitar dados de terceiros, e pode ser utilizado em algumas páginas para ver se aparecem problemas, mas deve ser vigiado. Sugestões para novas funções ou alterações dos seus mecanismos de dados de entrada e saída são bem-vindas.

Este módulo foi projetado especificamente para implementar um mecanismo que move o controle de se os valores do Wikidata são usados em uma infobox do programador da predefinição no nível de design da infobox para o editor no nível de artigo. Ele só deve ser usado dentro de uma infobox.

Uso[editar código-fonte]

O módulo provê essas chamadas especificamente para o uso em infoboxes no presente:

  1. getValue
  2. getPreferredValue
  3. getSourcedValue
  4. getCoords
  5. getQualifierValue

A chamada getSourcedValue é mantida para compatibilidade com versões anteriores, pois agora é redundante para getValue que pode fazer o mesmo trabalho usando o parâmetro |onlysourced=true.

Existem também essas chamadas úteis:

  1. getLink
  2. getLabel
  3. getAT
  4. formatDate
  5. checkBlacklist
  6. predDni
  7. predMorte

Chamadas generalizadas:

{{#invoke:WikidataIB |getValue |<PropertyID> |name=<fieldname> |suppressfields=<list of fields which will never display> |fetchwikidata=<list of fields to fetch values from Wikidata> |onlysourced=<yes/no> |noicon=<yes/no> |df=<dmy/mdy/y> |bc=<BC/BCE> |<local parameter>}}
{{#invoke:WikidataIB |getPreferredValue |<PropertyID> |name=<fieldname> |suppressfields=<list of fields which will never display> |fetchwikidata=<list of fields to fetch values from Wikidata> |onlysourced=<yes/no> |noicon=<yes/no> |df=<dmy/mdy/y> |bc=<BC/BCE> |<local parameter>}}
{{#invoke:WikidataIB |getSourcedValue |<PropertyID> |name=<fieldname> |suppressfields=<list of fields which will never display> |fetchwikidata=<list of fields to fetch values from Wikidata> |<local parameter>}}
{{#invoke:WikidataIB |getCoords |name=<fieldname> |suppressfields=<list of fields which will never display> |fetchwikidata=<list of fields to fetch values from Wikidata> |<local parameter>}}
{{#invoke:WikidataIB |getQualifierValue |<PropertyID> |pval=<ID of target value for the property> |qual=<qualifier ID for that target value> |name=<fieldname> |suppressfields=<list of fields which will never display> |fetchwikidata=<list of fields to fetch values from Wikidata> |onlysourced=<yes/no>}}

Função getValue[editar código-fonte]

  • getValue pode também pegar um parâmetro |qid= que é o ID do Wikidata para o artigo. Isto não será normalmente usado, mas está disponível para teste, embora faça a chamada cara.
  • A propriedade a ser retornada é passada na primeira propriedade não nomeada.
  • O nome do campo que a função é chamada é passada no parâmetro |name=, que é primeiramente checado em uma blacklist de campos que não devem ser mostradas nunca, (i.e. a chamada retorna nil em todas as circunstâncias). Se o campo não está na blacklist, é então checado contra uma whitelist. Se o nome do campo concorda, a chamada retornará qualquer valor fornecido localmente se é fornecido como segundo parâmetro não nomeado, ou o valor do Wikidata caso contrário.
  • O nome é compulsório quando a blacklist ou a whitelist é usada, então o módulo retorna nil se não é fornecido.
  • A blacklist é passada no parâmetro |suppressfields=
  • A whitelist é passada no parâmetro |fetchwikidata=

A função getValue aceitará um parâmetro booleano |onlysourced= que irá suprimir retornos dos valores do Wikidata que estão sem fontes ou somente referenciados a Wikipédia. A ausência do parâmetro, um parâmetro |onlysourced vazio e uma string vazia ("") têm como default para verdadeiro (i.e. somente os valores referenciados são retornados). Os valores no, false e 0 são tratados como falsos (i.e. todos os valores são retornados); qualquer outro valor é verdadeiro (embora |onlysourced=yes seja recomendado para legibilidade).

A função getValue aceitará um parâmetro booleano noicon que suprimirá o ícone "edite no Wikidata" para quando o valor retornado for processado futuramente pela infobox (e.g. uma url). A ausência do parâmetro ou um parâmetro |noicon vazio default para falso (i.e. o parâmetro é adicionado). A string vazia ("") e os valores no, false e 0 são tratados como falsos; qualquer outro valor é verdadeiro (embora |noicon=true seja recomendado para legibilidade).

Em ordem de lidar com o requerimento para datas em my, dmy ou y, getValue aceita um parâmetro |df= que pode pegar valores "dmy", "my" ou "y" - default é "dmy".

Se um artigo exigir o sufixo a.C., getValue retornará a data com esse sufixo;

Em uma invocação do módulo para extrair datas, getValue aceita um parâmetro |idioma= que pode receber o valor "pt" para formatar a data de acordo com o português europeu (única diferença se dá nas datas envolvendo o primeiro dia do mês. Por exemplo: 1º de maio de 2017 (em português brasileiro) e 1 de maio de 2017 (em português europeu)).

  • A propriedade a ser retornada é passada na primeira propriedade não nomeada.

A função getValue aceitará um especificador de uso de unidade de medida (ao invés da unidade por extenso) na terceira propriedade não nomeada. A unidade de medida será exibida somente se o valor passado for unidade

Função getPreferredValue[editar código-fonte]

A função getPreferredValue trabalha exatamente como getValue, tomando os mesmos parâmetros, mas se qualquer um dos valores para a propriedade tem um rank set preferido, ela retornará esses valores.

Exemplo[editar código-fonte]

Obtendo o(s) nome(s) da (QP170) de Corisca e Sátiro (Q29016906):

  • {{#invoke:WikidataIB |getValue |P170 |fetchwikidata=ALL |qid=Q29016906 |onlysourced=no}}Artemisia Gentileschi, Massimo Stanzioni Edite no Wikidata
  • {{#invoke:WikidataIB |getPreferredValue |P170 |fetchwikidata=ALL |qid=Q29016906 |onlysourced=no}}Artemisia Gentileschi Edite no Wikidata

Função getSourcedValue[editar código-fonte]

  • getSourcedValue trabalha exatamente como getValue, mas somente retorna valores que tenham referência a algo mais do que a Wikipedia. Não há garantias de fontes confiáveis, mas ajuda separar o joio do trigo.

Exemplo de getSourcedValue[editar código-fonte]

De Richard Burton (Q151973):

Burton correntemente tem quatro valores para (QP106) no Wikidata:

Usando getValue em Richard Burton:

  • {{#invoke:WikidataIB |getValue |P106 |name=occupation |fetchwikidata=ALL}} -> ator de cinema, diarista, ator de teatro, ator Edite no Wikidata

Usando getSourcedValue em Richard Burton:

  • {{#invoke:WikidataIB |getSourcedValue |P106 |name=occupation |fetchwikidata=ALL}} -> ator de cinema, diarista, ator Edite no Wikidata

Função getCoords[editar código-fonte]

  • getCoords pode também pegar um parâmetro |qid= que é o ID do Wikidata para o artigo. Isto não será normalmente usado, mas está disponível para testes, embora faça a chamada cara.
  • As coordenadas do Wikidata são passadas a Predefinição:Coord que retorna o display como se fosse chamado manualmente.
  • O nome do campo que a função é chamada é passada no parâmetro |name, que é primeiramente checado em uma blacklist de campos que não devem ser mostradas nunca, (i.e. a chamada retorna nil em todas as circunstâncias). Se o campo não está na blacklist, é então checado contra uma whitelist. Se o nome do campo concorda, a chamada retornará qualquer valor fornecido localmente se é fornecido como segundo parâmetro não nomeado, ou o valor do Wikidata caso contrário.
  • O nome é compulsório quando a blacklist ou a whitelist é usada, então o módulo retorna nil se não é fornecido.
  • A blacklist é passada no parâmetro |suppressfields=
  • A whitelist é passada no parâmetro |fetchwikidata=

Função getQualifierValue[editar código-fonte]

O getQualifierValue é para usar quando queremos concordar o valor de um qualificador. Nós precisamos saber a propriedade e o valor da propriedade que a qualifica. Os parâmetros são:

  • A propriedade ID passada no parâmetro não nomeado (ou |1)
  • O valor alvo para esta propriedade em |pval
  • O ID qualificador para o valor alvo em |qual
  • O nome do campo onde é chamada para implementar "whitelisting" e "blacklisting" da propriedade nele
  • A lista de campos para concordância ("whitelist") em |fetchwikidata= - aceita |fetchwikidata=ALL para concordar todos os campos
  • Lista opcional de campos para não serem exibidos ("blacklist") em |suppressfields=
  • booleano opcional para especificar se apenas valores referenciados da propriedade são retornados (default para "no") em |onlysourced=
  • Item ID opcional para acesso arbitrário (chamada carísssima!) em |qid=

Exemplo de getQualifierValue[editar código-fonte]

Em Telescópio do Polo Sul (Q1513315) existe uma propriedade (QP793), que tem um valor construção civil (Q385378). Tem dois qualificadores, (QP580) e (QP582). Para obter a data de início:

  • {{#invoke:WikidataIB |getQualifierValue |P793 |pval=Q385378 |qual=P580 |name=xyz |fetchwikidata=ALL }}

Em Telescópio do Polo Sul retorna:

  • novembro 2006

Função getLink[editar código-fonte]

getLink retorna o rótulo para um Qid ligado a wiki para o artigo local (se o artigo existe).

Função getLabel[editar código-fonte]

getLabel retorna o rótulo para uma Qid. Se o rótulo não existe, retorna o Qid. Note que este é o rótulo dado para a entrada no Wikidata na mesma linguagem da corrende Wikipédia, se o rótulo existe.

  • {{#invoke:WikidataIB |getLabel |Q29016906}} → Corisca e Sátiro
  • {{#invoke:WikidataIB |getLabel |Q3621491}} → arqueólogo

Função getAT[editar código-fonte]

getAT retorna o título do artigo para uma Qid. Se o título do artigo não existe, não retorna nada. Note que este é o título do artigo na corrente Wikipedia, se o interwiki existe na entrada Wikidata.

  • {{#invoke:WikidataIB |getAT |Q29016906}}
  • {{#invoke:WikidataIB |getAT |Q3621491}}

Função predDni[editar código-fonte]

predDni toma uma data de nascimento passada pelo usuário (tal como devolvida pela função getValue ou getPreferredValue ou da forma DD{{!}}MM{{!}}AAAA) e a insere dentro da predefinição:Dni. Também aceita os argumentos "|idioma=" caso se deseje exibir a data na variante do português angolano e a variável não nomeada "sem idade" quando não se desejar exibir a idade.

{{#invoke:WikidataIB |predDni |<data de nascimento obtida através da função getValue ou getPreferredValue acrescentada opcionalmente dos parâmetros "|idioma=" e "|sem idade" ou então a data por extenso como "01{{!}}04{{!}}2018">}}

Exemplo:

  • {{#invoke:WikidataIB|predDni|01{{!}}04{{!}}2016}}01 de abril de 2016 (2 anos)

Função predMorte[editar código-fonte]

Tal qual predDni, predMorte toma uma data de morte e uma data de nascimento passada pelo usuário (novamente: tal como devolvida pela função getValue ou getPreferredValue ou da forma DD{{!}}MM{{!}}AAAA) e a insere dentro da predefinição:Morte. Também aceita o argumento "|idioma=" caso se deseje exibir a data na variante do português angolano.

{{#invoke:WikidataIB |predMorte |<data de morte obtida através da função getValue ou getPreferredValue ou então a data por extenso como "01{{!}}04{{!}}2018">|<data de nascimento obtida através da função getValue ou getPreferredValue ou então a data por extenso como "01{{!}}04{{!}}2017">}}

Exemplo:

  • {{#invoke:WikidataIB|predMorte|01{{!}}04{{!}}2018|01{{!}}04{{!}}2016}}01 de abril de 2018 (2 anos)

Função formatDate*[editar código-fonte]

formatDate aceita uma data no formato usual de mw.wikibase.entity:formatPropertyValues, como "1 de agosto de 30 a.C." como parâmetro 1 e o formata de acordo com os parâmetros df e bc.

  • {{#invoke:WikidataIB |formatDate | 1 de agosto de 30 | bc=BC |df=dmy}}1
  • {{#invoke:WikidataIB |formatDate | 1 de agosto de 20 | bc=BCE |df=mdy}}1
  • df = "dmy" / "mdy" / "y" - default é "dmy"
  • bc = "BC" / "BCE" - default é "BCE"

* Não está funcionando normalmente


Adendo sobre o idioma de retorno[editar código-fonte]

Por padrão, os rótulos retornados pelo módulo serão retornados por default na variante brasileira do português. Caso um editor deseje que o rótulo seja retornado em português europeu (essas são, infelizmente, as duas únicas variantes implementadas no Wikidata), ao utilizar qualquer uma das funções apresentadas, basta adicionar |idioma=pt ou |idioma=pt-ao (neste caso, os rótulos serão retornados em português europeu, e as datas serão retornadas no formato angolano) nos parâmetros da função.

Ver também[editar código-fonte]

-- Module to implement use of a blacklist and whitelist for infobox fields
-- Can take a named parameter |qid which is the Wikidata ID for the article
-- if not supplied, it will use the Wikidata ID associated with the current page.
-- Fields in blacklist are never to be displayed, i.e. module must return nil in all circumstances
-- Fields in whitelist return local value if it exists or the Wikidata value otherwise
-- The name of the field that this function is called from is passed in named parameter |name
-- The name is compulsory when blacklist or whitelist is used,
-- so the module returns nil if it is not supplied.
-- blacklist is passed in named parameter |suppressfields (or |spf)
-- whitelist is passed in named parameter |fetchwikidata (or |fwd)

local p = {}
local i18n =
{
    ["errors"] =
    {
        ["property-not-found"] = "Propriedade não encontrada.",
        ["entity-not-found"] = "Entidade Wikidata desconhecida.",
        ["unknown-claim-type"] = "Tipo claim com valor desconhecido.",
        ["unknown-entity-type"] = "Tipo entity com valor desconhecido.",
        ["qualifier-not-found"] = "Qualificador não encontrado.",
        ["site-not-found"] = "Projeto Wikimedia não encontrado.",
        ["unknown-datetime-format"] = "Formato datatempo desconhecido.",
        ["local-article-not-found"] = "Artigo ainda não se econtra disponível nesta wiki.",
        ["No property supplied"] = "Nenhuma propriedade fornecida.", 
		["dab-page"] = "(desambiguação)",
    },
    ["editenowikidata"] = "Edite no Wikidata",
    ["filespace"] = "Ficheiro",
    ["Unknown"] = "Desconhecido",
    ["NaN"] = "NaN",
    ["latestdatequalifier"] = function (date) return "antes de " .. date end,
    ["months"] =
    {
    	"janeiro", "fevereiro", "março", "abril", "maio", "junho", "julho", "agosto", "setembro", "outubro", "novembro", "dezembro"
    },
    ["ac"] = "a.C.",
    ["century"] = "[[Século $1]]",
    ["centurysemlink"] = "século $1",
    ["datenumbersuffix"] = "",
	["list separator"] = ", ",
	["abbr"] =
	{
		["Q828224"]  = "km",
		["Q11573"]   = "m",
		["Q174728"]  = "cm",
		["Q174789"]  = "mm",
		["Q712226"]  = "km²",
		["Q11570"]   = "kg",
		["Q41803"]   = "g",
		["Q3241121"] = "mg",
		["Q2332346"] = "ml",
		["Q7727"]    = "min",
		["Q11574"]   = "s",
	},
}
-- This allows a internationisation module to override the above table
require("Module:i18n").loadI18n("Module:WikidataIB/i18n", i18n)

-- This piece of html implements a collapsible container. Check the classes exist on your wiki.
local collapsediv = '<div class="mw-collapsible mw-collapsed" style="width:100%; overflow:auto;" data-expandtext="{{int:show}}" data-collapsetext="{{int:hide}}">'

-------------------------------------------------------------------------------
-- Private functions
-------------------------------------------------------------------------------
--

-------------------------------------------------------------------------------
-- formatDate pega uma data no formato usual de mw.wikibase.entity:formatPropertyValues
-- como "1 de agosto de 30 aC" como primeiro parâmetro e o formata de acordo com os parâmetros dateformat (formato de data), bc (indicador de era), idioma e datasemlink
-- df = <"dmy"/"mdy"/"y">. O valor padrão é "dmy"
-- bc = <"a.C.">. O valor padrão será "a.C."
-- idioma = <"pt"/"pt-ao"/"">. O valor padrão é "", e significa que a data será exibida no formato português brasileiro. "pt" representa o formato português europeu e "pt-ao" o formato do português angolano.
-- datasemlink = <"sim"/"">. O valor padrão é "", e significa que a data será devolvida em formato wiki.
-- primeiro a versão local
local format_Date = function(datetime, dateformat, bc, idioma, datasemlink)
	local datetime = datetime or "14 de fevereiro 1 August 30 BCE" -- in case of nil value
	-- chop off multiple vales and/or any hours, mins, etc.
	-- keep anything before punctuation - we just want a single date:
	local dateval = string.match( datetime, "[%w ç]+")
	local dateformat = string.lower(dateformat or "dmy") -- default to dmy
	local datasemlink = datasemlink
	
	local c1
	local c2
	if datasemlink == "sim" then
		c1 = ""
		c2 = ""
	else
		c1 = "[["
		c2 = "]]"
	end
	
	local bc = string.upper(bc or "") -- can't use nil for bc
	-- we only want to accept two possibilities: BC or default to BCE
	if bc=="BCE" then
		bc = "&nbsp;" .. i18n["ac"] -- prepend the space. **internationalise later**
	else
		bc = "&nbsp;" .. i18n["ac"]
	end
	local postchrist = true -- start by assuming no BCE
	local dateparts = {}
	for word in string.gmatch(dateval,"([%w-ç]+)") do
		if word == "BC" or word=="BCE" then -- **internationalise later**
			postchrist = false
		else
			-- we'll keep the parts that are not 'BCE' in a table
			dateparts[#dateparts + 1] =  word
		end
	end
	if postchrist then bc = "" end -- set AD dates to no suffstring.("$1","$1",**internationalise later**
	local sep = "&nbsp;de&nbsp;" -- separator is nbsp
	local fdate = table.concat(dateparts, "&nbsp;de&nbsp;") -- formatted date defaults to same order as input
	-- if we have day month year, check dateformat
	if #dateparts == 3 then
		--por padrão dmy
		--se é dia primeiro
		if idioma == "pt" then
			fdate = c1..dateparts[1]..sep..dateparts[2]..c2..sep..c1..dateparts[3]..bc..c2
		elseif idioma =="pt-ao" then
			fdate = c1..dateparts[1]..sep..dateparts[2]:gsub("^%l", string.upper)..c2..sep..c1..dateparts[3]..bc..c2
		else
			if dateparts[1]==tostring(1) then
				fdate = c1..dateparts[1].."º"..sep..dateparts[2]..c2..sep..c1..dateparts[3]..bc..c2
			else
				fdate = c1..dateparts[1]..sep..dateparts[2]..c2..sep..c1..dateparts[3]..bc..c2
			end
		end
		if dateformat == "y" then
			fdate = c1..dateparts[3]..bc..c2
		elseif dateformat == "my" then
			if idioma =="pt-ao" then
				fdate = c1..dateparts[2]:gsub("^%l", string.upper) ..c2.. sep .. c1 .. dateparts[3] ..bc.. c2
			else
				fdate = c1..dateparts[2]:gsub("^%l", string.upper) ..c2.. sep .. c1 .. dateparts[3] ..bc.. c2
			end
		end
	elseif #dateparts == 2 then
		if dateformat == "y" then
			fdate = c1..dateparts[2]..bc..c2
		else
			if idioma == "pt-ao" then
				fdate = c1..dateparts[1]:gsub("^%l", string.upper)..c2..sep..c1..dateparts[2]..bc..c2
			else
				fdate = c1..dateparts[1]..c2..sep..c1..dateparts[2]..bc..c2
			end
		end
	else
		fdate = c1..dateparts[1]..bc..c2
	end
	
	return fdate
end

-------------------------------------------------------------------------------
-- makeOrdinal needs to be internationalised along with the above:
-- takes cardinal numer as a numeric and returns the ordinal as a string
-- we need three exceptions in English for 1st, 2nd, 3rd, 21st, .. 31st, etc.
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
local function makeOrdinal(cardinal)
	local ordsuffix = i18n.ordinal.default
	if cardinal % 10 == 1 then
		ordsuffix = i18n.ordinal[1]
	elseif cardinal % 10 == 2 then
		ordsuffix = i18n.ordinal[2]
	elseif cardinal % 10 == 3 then
		ordsuffix = i18n.ordinal[3]
	end
	-- In English, 1, 21, 31, etc. use 'st', but 11, 111, etc. use 'th'
	-- similarly for 12 and 13, etc.
	if (cardinal % 100 == 11) or (cardinal % 100 == 12) or (cardinal % 100 == 13) then
		ordsuffix = i18n.ordinal.default
	end
	return tostring(cardinal) .. ordsuffix
end


-------------------------------------------------------------------------------
-- findLang takes a "langcode" parameter if supplied
-- otherwise it tries to create it from the user's set language ({{int:lang}})
-- failing that it uses the wiki's content language.
-- It returns a language object
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
local function findLang(langcode)
	local langobj
	if not langcode or langcode == "" then
		langcode = mw.getCurrentFrame():preprocess( '{{int:lang}}' )
	end
	if mw.language.isKnownLanguageTag(langcode) then
		langobj = mw.language.new( langcode )
	else
		langobj = mw.language.getContentLanguage()
	end
	return langobj
end


-------------------------------------------------------------------------------
-- roundto takes a positive number (x)
-- and returns it rounded to (sf) significant figures
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
local function roundto(x, sf)
	if x == 0 then return 0 end
	x = math.abs(x)
	if sf < 1 then sf = 1 end
	local e = math.floor(math.log10(x)) - sf + 1
	local m = math.floor(x / 10^e + 0.5)
	x = m * 10^e
	-- if it's integral, cast to an integer:
	if  x == math.floor(x) then x = math.floor(x) end
	return x
end


-------------------------------------------------------------------------------
-- decimalToDMS takes a decimal degrees (x) with precision (p)
-- and returns degrees/minutes/seconds according to the precision
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
local function decimalToDMS(x, p)
	-- if p is not supplied, use a precision around 0.1 seconds
	if not tonumber(p) then p = 1e-4 end
	local d = math.floor(x)
	local ms = (x - d) * 60
	if p > 0.5 then -- precision is > 1/2 a degree
		if ms > 30 then d = d + 1 end
		ms = 0
	end
	local m = math.floor(ms)
	local s = (ms - m) * 60
	if p > 0.008 then -- precision is > 1/2 a minute
		if s > 30 then m = m +1 end
		s = 0
	elseif p > 0.00014 then -- precision is > 1/2 a second
		s = math.floor(s + 0.5)
	elseif p > 0.000014 then -- precision is > 1/20 second
		s = math.floor(10 * s + 0.5) / 10
	elseif p > 0.0000014 then -- precision is > 1/200 second
		s = math.floor(100 * s + 0.5) / 100
	else -- cap it at 3 dec places for now
		s = math.floor(1000 * s + 0.5) / 1000
	end
	return d, m, s
end


-------------------------------------------------------------------------------
-- decimalPrecision takes a decimal (x) with precision (p)
-- and returns x rounded approximately to the given precision
-- precision should be between 1 and 1e-6, preferably a power of 10.
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
local function decimalPrecision(x, p)
	-- if p is not supplied, pick an arbitrary precision
	if not tonumber(p) then p = 1e-4 end
	if p > 1 then p = 1 end
	if p < 1e-6 then p = 1e-6 end
	local e = math.floor(math.log10(p))
	local m = math.floor(x / 10^e + 0.5)
	x = m * 10^e
	-- if it's integral, cast to an integer:
	if  x == math.floor(x) then x = math.floor(x) end
	-- if it's less than 1e-4, it will be in exponent form, so return a string with 6dp
	-- 9e-5 becomes 0.000090
	if math.abs(x) < 1e-4 then x = string.format("%f", x) end
	return x
end



-------------------------------------------------------------------------------
-- parseParam takes a (string) parameter, e.g. from the list of frame arguments,
-- and makes "false", "no", and "0" into the (boolean) false
-- it makes the empty string and nil into the (boolean) value passed as default
-- allowing the parameter to be true or false by default.
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
local parseParam = function(param, default)
	if param and param ~= "" then
		param = param:lower()
		if (param == "false") or (param == "no") or (param == "0") then
			return false
		else
			return true
		end
	else
		return default
	end
end


-------------------------------------------------------------------------------
-- The label in a Wikidata item is subject to vulnerabilities
-- that an attacker might try to exploit.
-- It needs to be 'sanitised' by removing any wikitext before use.
-- If it doesn't exist, return the id for the item
-- a second (boolean) value is also returned, value is true when the label exists
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
local labelOrId = function (id)
	local label = mw.wikibase.label(id)
	if label then
		return mw.text.nowiki(label), true
	else
		return id, false
	end
end


-------------------------------------------------------------------------------
-- sourced takes a table representing a statement that may or may not have references
-- it counts how many references are sourced to something not containing the word "wikipedia"
-- it returns a boolean = true if there are any sourced references.
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
local sourced = function(claim)
	if claim.references then
		for kr, vr in pairs(claim.references) do
			local ref = mw.wikibase.renderSnaks(vr.snaks)
			if not ref:find("Wikipedia") then
				return true
			end
		end
	end
end


-------------------------------------------------------------------------------
-- setRanks takes a flag (parameter passed) that requests the values to return
-- "b[est]" returns preferred if available, otherwise normal
-- "p[referred]" returns preferred
-- "n[ormal]" returns normal
-- "d[eprecated]" returns deprecated
-- multiple values are allowed, e.g. "preferred normal" (which is the default)
-- "best" will override the other flags, and set p and n
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
local function setRanks(rank)
	rank = (rank or ""):lower()
	-- if nothing passed, return preferred and normal
	-- if rank == "" then rank = "p n" end
	local ranks = {}
	for w in string.gmatch(rank, "%a+") do
		w = w:sub(1,1)
		if w == "b" or w == "p" or w == "n" or w == "d" then
			ranks[w] = true
		end
	end
	-- check if "best" is requested or no ranks requested; and if so, set preferred and normal
	if ranks.b or not next(ranks) then
		ranks.p = true
		ranks.n = true
	end
	return ranks
end


-------------------------------------------------------------------------------
-- parseInput processes the Q-id , the blacklist and the whitelist
-- if an input parameter is supplied, it returns that and ends the call.
-- it returns (1) either the qid or nil indicating whether or not the call should continue
-- and (2) a table containing all of the statements for the propertyID and relevant Qid
-- if "best" ranks are requested, it returns those instead of all non-deprecated ranks
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
local parseInput = function(frame, input_parm, property_id)
	-- There may be a local parameter supplied, if it's blank, set it to nil
	input_parm = mw.text.trim(input_parm or "")
	if input_parm == "" then input_parm = nil end

	local args = frame.args

	-- can take a named parameter |qid which is the Wikidata ID for the article.
	-- if it's not supplied, use the id for the current page
	local qid = args.qid or ""
	if qid == "" then qid = mw.wikibase.getEntityIdForCurrentPage() end
	-- if there's no Wikidata item for the current page return nil
	if not qid then return false, nil end

	-- The blacklist is passed in named parameter |suppressfields
	local blacklist = args.suppressfields or args.spf

	-- The whitelist is passed in named parameter |fetchwikidata
	local whitelist = args.fetchwikidata or args.fwd
	if not whitelist or whitelist == "" then whitelist = "NONE" end

	-- The name of the field that this function is called from is passed in named parameter |name
	local fieldname = args.name or ""

	if blacklist then
		-- The name is compulsory when blacklist is used, so return nil if it is not supplied
		if not fieldname or fieldname == "" then return false, nil end
		-- If this field is on the blacklist, then return nil
		if blacklist:find(fieldname) then return false, nil end
	end

	-- If we got this far then we're not on the blacklist
	-- The blacklist overrides any locally supplied parameter as well
	-- If a non-blank input parameter was supplied return it
	if input_parm then return false, input_parm end

	-- Otherwise see if this field is on the whitelist:
	-- needs a bit more logic because find will return its second value = 0 if fieldname=""
	-- but nil if fieldname not found on whitelist
	local _, found = whitelist:find(fieldname)
	found = ((found or 0) > 0)
	if whitelist ~= 'ALL' and (whitelist:upper() == "NONE" or not found) then
		return false, nil
	end

	-- See what's on Wikidata (the call always returns a table, but it may be empty):
	local props = {}
	if args.reqranks.b then
		props = mw.wikibase.getBestStatements(qid, property_id)
	else
		props = mw.wikibase.getAllStatements(qid, property_id)
	end
	if props[1] then
		return qid, props
	end
	-- no property on Wikidata
	return false, nil
end


-------------------------------------------------------------------------------
-- assembleoutput takes the sequence table containing the property values
-- and formats it according to switches given
-- it needs the entityID and propertyID to link from the pen icon
-------------------------------------------------------------------------------
-- Dependencies: parseParam();
-------------------------------------------------------------------------------
local function assembleoutput(out, args, entityID, propertyID)

	-- sorted is a boolean passed to enable sorting of the values returned
	-- if nothing or an empty string is passed set it false
	-- if "false" or "no" or "0" is passed set it false
	local sorted = parseParam(args.sorted, false)

	-- noicon is a boolean passed to suppress the trailing "edit at Wikidata" icon
	-- for use when the value is processed further by the infobox
	-- if nothing or an empty string is passed set it false
	-- if "false" or "no" or "0" is passed set it false
	local noic = parseParam(args.noicon, false)

	-- list is the name of a template that a list of multiple values is passed through
	-- examples include "hlist" and "ubl"
	-- setting it to "prose" produces something like "1, 2, 3, and 4"
	local list = args.list or ""

	-- sep is a string that is used to separate multiple returned values
	-- if nothing or an empty string is passed set it to the default
	-- any double-quotes " are stripped out, so that spaces may be passed
	-- e.g. |sep=" - "
	local sepdefault = i18n["list separator"]
	local separator = args.sep or ""
	separator = string.gsub(separator, '"', '')
	if separator == "" then
		separator = sepdefault
	end

	-- collapse is a number that determines the maximum number of returned values
	-- before the output is collapsed.
	-- Zero or not a number result in no collapsing (default becomes 0).
	local collapse = tonumber(args.collapse) or 0

	-- if there's anything to return, then return a list
	-- comma-separated by default, but may be specified by the sep parameter
	-- optionally specify a hlist or ubl or a prose list, etc.
	local strout
	if #out > 0 then
		if sorted then table.sort(out) end
		-- if a pen icon is wanted add it the end of the last value
		if not noic then
			local icon = "&nbsp;[[" .. i18n["filespace"]
			icon = icon .. ":Blue pencil.svg |frameless |text-top |10px |alt="
			icon = icon .. i18n["editonwikidata"]
			icon = icon .. "|link=https://www.wikidata.org/wiki/" .. entityID
			icon = icon .. "?uselang=" .. args.langobj.code
			icon = icon .. "#" .. propertyID .. "|" .. i18n["editonwikidata"] .. "]]"
			out[#out] = out[#out] .. icon
		end
		if list == "" then
			strout = table.concat(out, separator)
		elseif list:lower() == "prose" then
			strout = mw.text.listToText( out )
		else
			strout = mw.getCurrentFrame():expandTemplate{title = list, args = out}
		end
		if collapse >0 and #out > collapse then
			strout = collapsediv .. strout .. "</div>"
		end
	else
		strout = nil -- no items had valid reference
	end
	return strout
end


-------------------------------------------------------------------------------
-- propertyvalueandquals takes a property object, the arguments passed from frame,
-- and a qualifier propertyID.
-- It returns a sequence (table) of values representing the values of that property
-- and qualifiers that match the qualifierID if supplied.
-------------------------------------------------------------------------------
-- Dependencies: parseParam(); sourced(); labelOrId(); i18n.latestdatequalifier(); format_Date();
-- makeOrdinal(); roundto(); decimalPrecision(); decimalToDMS(); assembleoutput();
-------------------------------------------------------------------------------
local function propertyvalueandquals(objproperty, args, qualID)

	-- onlysourced is a boolean passed to return only values sourced to other than Wikipedia
	-- if nothing or an empty string is passed set it true
	local onlysrc = parseParam(args.onlysourced or args.osd, true)

	-- linked is a a boolean that enables the link to a local page via sitelink
	-- if nothing or an empty string is passed set it true
	local linked = parseParam(args.linked, true)

	-- prefix is a string that may be nil, empty (""), or a string of characters
	-- this is prefixed to each value
	-- useful when when multiple values are returned
	-- any double-quotes " are stripped out, so that spaces may be passed
	local prefix = (args.prefix or ""):gsub('"', '')

	-- postfix is a string that may be nil, empty (""), or a string of characters
	-- this is postfixed to each value
	-- useful when when multiple values are returned
	-- any double-quotes " are stripped out, so that spaces may be passed
	local postfix = (args.postfix or ""):gsub('"', '')

	-- linkprefix is a string that may be nil, empty (""), or a string of characters
	-- this creates a link and is then prefixed to each value
	-- useful when when multiple values are returned and indirect links are needed
	-- any double-quotes " are stripped out, so that spaces may be passed
	local lprefix = (args.linkprefix or ""):gsub('"', '')

	-- linkpostfix is a string that may be nil, empty (""), or a string of characters
	-- this is postfixed to each value when linking is enabled with lprefix
	-- useful when when multiple values are returned
	-- any double-quotes " are stripped out, so that spaces may be passed
	local lpostfix = (args.linkpostfix or ""):gsub('"', '')

	-- wdlinks is a boolean passed to enable links to Wikidata when no article exists
	-- if nothing or an empty string is passed set it false
	local wdl = parseParam(args.wdlinks or args.wdl, false)

	-- unitabbr is a boolean passed to enable unit abbreviations for common units
	-- if nothing or an empty string is passed set it false
	local uabbr = parseParam(args.unitabbr, false)

	-- maxvals is a string that may be nil, empty (""), or a number
	-- this determines how many items may be returned when multiple values are available
	-- setting it = 1 is useful where the returned string is used within another call, e.g. image
	local maxvals = tonumber(args.maxvals) or 0

	-- all proper values of a Wikidata property will be the same type as the first
	-- qualifiers don't have a mainsnak, properties do
	local datatype = objproperty[1].datatype or objproperty[1].mainsnak.datatype
	-- out holds the values for this property
	-- mtl holds the language code if the datatype is monolingual text
	local out = {}
	local mtl = {}
	for k, v in pairs(objproperty) do
		local snak = v.mainsnak or v
		local datavalue = snak.datavalue
		datavalue = datavalue and datavalue.value
		if onlysrc and not sourced(v) then
			-- nothing added to 'out': it isn't sourced when onlysourced=true
			------------------------------------
		elseif v.rank == "deprecated" and not args.reqranks.d then
			-- nothing added to 'out': value is deprecated but not requested
			------------------------------------
		elseif v.rank == "normal" and not args.reqranks.n then
			-- nothing added to 'out': value is normal but not requested
			------------------------------------
		elseif v.rank == "preferred" and not args.reqranks.p then
			-- nothing added to 'out': value is preferred but not requested
			------------------------------------
		elseif snak.snaktype == "somevalue" then -- value is unknown
			out[#out + 1] = i18n["Unknown"]
			------------------------------------
		elseif snak.snaktype == "novalue" then -- value is none
			-- out[#out + 1] = "No value" -- don't return anything
			------------------------------------
		elseif datatype == "wikibase-item" then -- data type is a wikibase item:
			-- it's wiki-linked value, so output as link if enabled and possible
			local qnumber = datavalue.id
			local sitelink = mw.wikibase.sitelink(qnumber)
			local label, islabel = labelOrId(qnumber)
			if linked then
				if sitelink then
					-- strip any namespace or dab from the sitelink
					-- and use that as label
					local pos = sitelink:find(":") or 0
					label = sitelink:sub(pos+1):gsub("%s%(.+%)$", ""):gsub(",.+$", "")
					out[#out + 1] = "[[" .. lprefix .. sitelink .. lpostfix .. "|" .. label .. "]]"
				elseif islabel then
					-- no sitelink, label exists
					-- examine what an article with a title the same as the label would be
					local artitle = mw.title.new(label, 0)
					if artitle and artitle.redirectTarget then
						-- there's a redirect with the same title as the label
						-- let's link to that
						out[#out + 1] = "[[".. lprefix .. label .. lpostfix
						out[#out] = out[#out] .. "|" .. label .. "]]"
					else
						-- no sitelink, label exists, not a redirect
						-- output the plain label (optionally with Wikidata link)
						if wdl then
							-- show that there's a Wikidata entry available
							local wd = "[[:d:" .. qnumber .. "|" .. label
							wd = wd .. "]]&nbsp;<span title='"
							wd = wd .. i18n["errors"]["local-article-not-found"]
							wd = wd .. "'>[[File:Wikidata-logo.svg|16px|alt=|link=]]</span>"
							out[#out + 1] = wd
						else
							-- no wikidata links required, so just give the plain label
							out[#out + 1] = label
						end -- test if wikdata link display required
					end -- test if article title exists as redirect on current Wiki
				else
					-- no sitelink and no label
					out[#out + 1] = qnumber
				end -- test for sitelink exists
			else -- no link wanted so test for lang code
				local lang = args.lang or ""
				if lang ~= "" then
					-- there's a language code given, so look for label and sanitise it
					label = mw.text.nowiki( mw.wikibase.getLabelByLang(qnumber, lang) or label )
				end
				-- add the plain label
				out[#out + 1] = label
			end -- test for link required
			-- If the property has a qualifier of latest date, add that in all cases:
			if v.qualifiers then
				local quals = v.qualifiers["P1326"] -- latest date qualifier
				if quals then
					local ldq = i18n.latestdatequalifier(mw.wikibase.renderSnaks(quals))
					out[#out] = out[#out] .. " (" .. ldq .. ")"
				end
			end
			------------------------------------
		elseif datatype == "time" then -- data type is time:
			-- it's a date value, so output according to formatting preferences
			local timestamp = datavalue.time
			-- A year can be stored like this: "+1872-00-00T00:00:00Z",
			-- which is processed here as if it were the day before "+1872-01-01T00:00:00Z",
			-- and that's the last day of 1871, so the year is wrong.
			-- So fix the month 0, day 0 timestamp to become 1 January instead:
			timestamp = timestamp:gsub("%-00%-00T", "-01-01T")
			local dateprecision = datavalue.precision
			local fpvdate = tonumber(timestamp:sub(2, 5))
			local fdate
			if dateprecision >= 9 then -- precision is year or shorter
				local dateformat = "y"
				if dateprecision >= 10 then -- prepend month
					fpvdate = i18n.months[tonumber(timestamp:sub(7, 8))] .. " " .. fpvdate
					dateformat = args.df
					if dateprecision >= 11 then -- prepend day
							fpvdate = tonumber(timestamp:sub(10, 11)) .. " " .. fpvdate
					end
				end
				if timestamp:sub(1, 1) == "-" then
					fpvdate = fpvdate .. " BCE"
				end
				fdate = format_Date(fpvdate, dateformat, args.bc, args.idioma, args.datasemlink)
				-- testing the ability to add "circa" from P1480 "sourcing circumstances"
				-- just testing on years for now
				if dateprecision == 9 and v.qualifiers then
					local sc = v.qualifiers.P1480
					if sc then
						local circa = ""
						for k1, v1 in pairs(sc) do
							if v1.datavalue.value.id == "Q5727902" then
								circa = '<abbr title="circa">c.</abbr>&nbsp;'
								break
							end
						end
						fdate = circa .. fdate
					end
				end
			elseif dateprecision == 7 then -- century
				local century = require("Módulo:Romano")._main({math.floor((fpvdate - 1) / 100) + 1})
				if timestamp:sub(1, 1) == "-" then -- date is BC
					if datasemlink == "sim" then
						fdate = mw.ustring.gsub(i18n["centurysemlink"], "$1", century.."&nbsp;"..i18n["ac"])
					else
						fdate = mw.ustring.gsub(i18n["century"], "$1", century.."&nbsp;"..i18n["ac"])
					end
				else
					if datasemlink == "sim" then
						fdate = mw.ustring.gsub(i18n["centurysemlink"], "$1", century)
					else
						fdate = mw.ustring.gsub(i18n["century"], "$1", century)
					end
				end
			else
				-- date precisions 0 to 6 (billion years to millenium) TODO:
				--
			end
			out[#out+1] = fdate
			------------------------------------
		-- data types which are strings:
		elseif datatype == "commonsMedia" or datatype == "external-id" or datatype == "string" or datatype == "url" then
			-- commonsMedia or external-id or string or url
			-- all have mainsnak.datavalue.value as string
			if lprefix == "" and lpostfix == "" then
				out[#out+1] = prefix .. datavalue .. postfix
			else
				out[#out+1] = "[[" .. lprefix .. datavalue .. lpostfix
				out[#out] = out[#out] .. "|" .. prefix .. datavalue .. postfix .. "]]"
			end -- check for link requested (i.e. either linkprefix or linkpostfix exists)
			------------------------------------
		-- data types which are quantities:
		elseif datatype == "quantity" then
			-- quantities have mainsnak.datavalue.value.amount and mainsnak.datavalue.value.unit
			-- the unit is of the form http://www.wikidata.org/entity/Q829073
			--
			-- get the language object as 'lang' to format the numerical value
			local lang = args.langobj
			--
			-- implement a switch to turn on/off numerical formatting later
			local fnum = true
			-- convert amount to a number
			local amount = tonumber(datavalue.amount) or i18n["NaN"]
			-- check if upper and/or lower bounds are given and significant
			local upb = tonumber(datavalue.upperBound)
			local lowb = tonumber(datavalue.lowerBound)
			if upb and lowb then
				-- differences rounded to 2 sig fig:
				local posdif = roundto(upb - amount, 2)
				local negdif = roundto(amount - lowb, 2)
				if fnum then amount = lang:formatNum( amount ) end
				if posdif ~= negdif then
					-- non-symmetrical
					amount = amount .. " +" .. posdif .. " -" .. negdif
				elseif posdif ~= 0 then
					-- symmetrical and significant
					amount = amount .. " ±" .. posdif
				else
				-- otherwise range is zero, so leave it off: amount = amount
				end
			else
				if fnum then amount = lang:formatNum( amount ) end
			end
			-- extract the qid in the form 'Qnnn' from the value.unit url
			-- and then fetch the label from that
			local unit = ""
			local unitqid = string.match( datavalue.unit, "(Q%d+)" )
			if unitqid then
				if uabbr and i18n.abbr[unitqid] then
					-- it's on the list of common abbreviations, so use that
					unit = "&nbsp;" .. i18n.abbr[unitqid]
				else
					-- otherwise use the label (i.e. unit name) if it exists
					local uname = mw.wikibase.label( unitqid )
					if uname then unit = " " .. uname end
				end
			end
			out[#out+1] = amount .. unit
			------------------------------------
		-- datatypes which are global coordinates:
		elseif datatype == "globe-coordinate" then
			-- 'display' parameter defaults to "inline, title" *** unused for now ***
			-- local disp = args.display or ""
			-- if disp == "" then disp = "inline, title" end
			--
			-- format parameter switches from deg/min/sec to decimal degrees
			-- default is deg/min/sec -- decimal degrees needs |format = dec
			local form = (args.format or ""):lower():sub(1,3)
			if form ~= "dec" then form = "dms" end
			--
			-- show parameter allows just the latitude or longitude to be shown
			local show = (args.show or ""):lower()
			if show ~= "longlat" then show = show:sub(1,3) end
			--
			local lat, long, prec = datavalue.latitude, datavalue.longitude, datavalue.precision
			if show == "lat" then
				out[#out+1] = decimalPrecision(lat, prec)
			elseif show == "lon" then
				out[#out+1] = decimalPrecision(long, prec)
			elseif show == "longlat" then
				out[#out+1] = decimalPrecision(long, prec) .. ", " .. decimalPrecision(lat, prec)
			else
				local ns = "N"
				local ew = "E"
				if lat < 0 then
					ns = "S"
					lat = - lat
				end
				if long < 0 then
					ew = "W"
					long = - long
				end
				if form == "dec" then
					lat = decimalPrecision(lat, prec)
					long = decimalPrecision(long, prec)
					out[#out+1] = lat .. "°" .. ns .. " " .. long ..  "°" .. ew
				else
					local latdeg, latmin, latsec = decimalToDMS(lat, prec)
					local longdeg, longmin, longsec = decimalToDMS(long, prec)

					if latsec == 0 and longsec == 0 then
						if latmin == 0 and longmin == 0 then
							out[#out+1] = latdeg .. "°" .. ns .. " " .. longdeg ..  "°" .. ew
						else
							out[#out+1] = latdeg .. "°" .. latmin .. "′" .. ns .. " "
							out[#out] = out[#out] .. longdeg .. "°".. longmin .. "′" .. ew
						end
					else
						out[#out+1] = latdeg .. "°" .. latmin .. "′" .. latsec .. "″" .. ns .. " "
						out[#out] = out[#out] .. longdeg .. "°" .. longmin .. "′" .. longsec .. "″" .. ew
					end
				end
			end
			------------------------------------
		elseif datatype == "monolingualtext" then -- data type is Monolingual text:
			-- has mainsnak.datavalue.value as a table containing language/text pairs
			-- collect all the values in 'out' and languages in 'mtl' and process them later
			out[#out+1] = prefix .. datavalue.text .. postfix
			mtl[#out] = datavalue.language
			------------------------------------
		else
			-- some other data type so write a specific handler
			out[#out+1] = "unknown data type: " .. datatype
		end -- of datatype/unknown value/sourced check

		-- See if qualifiers are to be returned:
		if v.qualifiers and qualID and snak.snaktype=="value" then
			local qsep = (args.qsep or ""):gsub('"', '')
			local qargs = {
				["osd"]         = "false",
				["linked"]      = tostring(linked),
				["prefix"]      = args.qprefix,
				["postfix"]     = args.qpostfix,
				["linkprefix"]  = args.qlinkprefix,
				["linkpostfix"] = args.qlinkpostfix,
				["wdl"]         = "false",
				["unitabbr"]    = tostring(uabbr),
				["maxvals"]     = 0,
				["sorted"]      = args.qsorted,
				["noicon"]      = "true",
				["list"]        = "",
				["sep"]         = qsep,
				["langobj"]     = args.langobj,
			}
			if qualID == "DATES" then qargs.maxvals = 1 end
			local qlist = {}
			local t1, t2, dsep = "", "", ""
			for k1, v1 in pairs(v.qualifiers) do
				-- look for date range:
				if qualID == "DATES" then
					if k1 == "P580" then -- P580 is "start time"
						t1 = propertyvalueandquals(v1, qargs)[1] or ""
					elseif k1 == "P582" then -- P582 is "end time"
						t2 = propertyvalueandquals(v1, qargs)[1] or ""
					end
				-- check for latest date qualifier:
				elseif k1 == "P1326" then
					-- do nothing - this is handled already
				-- otherwise see if we want this qualifier:
				elseif qualID == "ALL" or qualID == k1 then 
					local ql = propertyvalueandquals(v1, qargs)
					for k2, v2 in ipairs(ql) do
						qlist[#qlist + 1] = v2
					end
				end
			end -- of loop through qualifiers
			local t = t1 .. t2
			-- *** internationalise date separators later ***
			if t:find("%s") or t:find("&nbsp;") then dsep = "  &ndash; " else dsep = "&ndash;" end
			if #qlist > 0 then
				local qstr = assembleoutput(qlist, qargs)
				out[#out] = out[#out] .. " (" .. qstr .. ")"
			elseif t > "" then
				out[#out] = out[#out] .. " (" .. t1 .. dsep .. t2 .. ")"
			end
		end -- of test for qualifiers wanted
		if maxvals > 0 and #out >= maxvals then break end
	end -- of for each value loop

	-- we need to pick one value to return if the datatype was "monolingualtext"
	-- if there's only one value, use that
	-- otherwise look through the fallback languages for a match
	if datatype == "monolingualtext" and #out >1 then
		local langcode = args.langobj.code
		langcode = mw.text.split( langcode, '-', true )[1]
		local fbtbl = mw.language.getFallbacksFor( langcode )
		table.insert( fbtbl, 1, langcode )
		bestval = ""
		found = false
		for idx1, lang1 in ipairs(fbtbl) do
			for idx2, lang2 in ipairs(mtl) do
				if (lang1 == lang2) and not found then
					bestval = out[idx2]
					found = true
					break
				end
			end -- loop through values of property
		end -- loop through fallback languages
		if found then
			-- replace output table with a table containing the best value
			out = { bestval }
		else
			-- more than one value and none of them on the list of fallback languages
			-- sod it, just give them the first one
			out = { out[1] }
		end
	end
	return out
end


-------------------------------------------------------------------------------
-- _getvalue is the private function for getValue
-------------------------------------------------------------------------------
-- Dependencies: propertyvalueandquals(); assembleoutput();
-- parseParam(); sourced(); labelOrId(); i18n.latestdatequalifier(); format_Date();
-- findLang(); makeOrdinal(); roundto(); decimalPrecision(); decimalToDMS();
-------------------------------------------------------------------------------
local function _getvalue(frame, props, propertyID, entityid)

	-- qual is a string containing the property ID of the qualifier(s) to be returned
	-- if qual == "ALL" then all qualifiers returned
	-- if qual == "DATES" then qualifiers P580 (start time) and P582 (end time) returned
	-- if nothing or an empty string is passed set it nil -> no qualifiers returned
	local qualID = mw.text.trim(frame.args.qual or ""):upper()
	if qualID == "" then qualID = nil end

	-- set a language object in the frame.args table
	frame.args.langobj = findLang(frame.args.lang)

	-- table 'out' stores the return value(s):
	local out = propertyvalueandquals(props, frame.args, qualID)

	-- format the table of values and return it as a string:
	return assembleoutput(out, frame.args, entityid, propertyID)
end


-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
-- Public functions
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
-- getValue is used to get the value(s) of a property
-- The property ID is passed as the first unnamed parameter and is required.
-- A locally supplied parameter may optionaly be supplied as the second unnamed parameter.
-- The function will now also return qualifiers if parameter qual is supplied
-------------------------------------------------------------------------------
-- Dependencies: setRanks(); parseInput(); _getvalue();
-- propertyvalueandquals(); assembleoutput();
-- parseParam(); sourced(); labelOrId(); i18n.latestdatequalifier(); format_Date();
-- makeOrdinal(); roundto(); decimalPrecision(); decimalToDMS();
-------------------------------------------------------------------------------
p.getValue = function(frame)
	if not frame.args[1] then
		frame.args = frame:getParent().args
		if not frame.args[1] then return i18n.errors["No property supplied"] end
	end

	local propertyID = mw.text.trim(frame.args[1] or "")

	frame.args.reqranks = setRanks(frame.args.rank)

	local entityid, props = parseInput(frame, frame.args[2], propertyID)

	if not entityid then
		return props -- either the input parameter or nothing
	end

	return _getvalue(frame, props, propertyID, entityid)
end


-------------------------------------------------------------------------------
-- getPreferredValue is used to get a value,
-- (or a comma separated list of them if multiple values exist).
-- If preferred ranks are set, it will return those values, otherwise values with normal ranks
-- now redundant to getValue with |rank=best
-------------------------------------------------------------------------------
-- Dependencies: p.getValue(); setRanks(); parseInput(); _getvalue();
-- propertyvalueandquals(); assembleoutput();
-- parseParam(); sourced(); labelOrId(); i18n.latestdatequalifier(); format_Date();
-- makeOrdinal(); roundto(); decimalPrecision(); decimalToDMS();
-------------------------------------------------------------------------------
p.getPreferredValue = function(frame)
	frame.args.rank = "best"
	return p.getValue(frame)
end


-------------------------------------------------------------------------------
-- getNormalValue is used to get a value,
-- (or a comma separated list of them if multiple values exist).
-- If normal ranks are set, it will return those values, otherwise all values
-- now redundant to getValue with |rank=normal
-------------------------------------------------------------------------------
-- Dependencies: p.getValue(); setRanks(); parseInput(); _getvalue();
-- propertyvalueandquals(); assembleoutput();
-- parseParam(); sourced(); labelOrId(); i18n.latestdatequalifier(); format_Date();
-- makeOrdinal(); roundto(); decimalPrecision(); decimalToDMS();
-------------------------------------------------------------------------------
p.getNormalValue = function(frame)
	frame.args.rank = "normal"
	return p.getValue(frame)
end


-------------------------------------------------------------------------------
-- getCoords is used to get coordinates for display in an infobox
-- whitelist and blacklist are implemented
-- optional 'display' parameter is allowed, defaults to "inline, title"
-------------------------------------------------------------------------------
-- Dependencies: setRanks(); parseInput(); decimalPrecision();
-------------------------------------------------------------------------------
p.getCoords = function(frame)
	local propertyID = "P625"

	-- if there is a 'display' parameter supplied, use it
	-- otherwise default to "inline, title"
	local disp = frame.args.display or ""
	if disp == "" then
		disp = "inline, title"
	end

	-- there may be a format parameter to switch from deg/min/sec to decimal degrees
	-- default is deg/min/sec
	-- decimal degrees needs |format = dec
	local form = (frame.args.format or ""):lower():sub(1,3)
	if form ~= "dec" then
		form = "dms"
	end

	-- just deal with best values
	frame.args.reqranks = setRanks("best")

	local qid, props = parseInput(frame, frame.args[1], propertyID)
	if not qid then
		return props -- either local parameter or nothing
	else
		dv = props[1].mainsnak.datavalue.value
		local lat, long, prec = dv.latitude, dv.longitude, dv.precision
		lat = decimalPrecision(lat, prec)
		long = decimalPrecision(long, prec)
		local lat_long = { lat, long }
		lat_long["display"] = disp
		lat_long["format"] = form
		-- invoke template Coord with the values stored in the table
		return frame:expandTemplate{title = 'coord', args = lat_long}
	end
end


-------------------------------------------------------------------------------
-- getQualifierValue is used to get a formatted value of a qualifier
--
-- The call needs:	a property (the unnamed parameter or 1=)
-- 					a target value for that property (pval=)
--					a qualifier for that target value (qual=)
-- The usual whitelisting and blacklisting of the property is implemented
-- The boolean onlysourced= parameter can be set to return nothing
-- when the property is unsourced (or only sourced to Wikipedia)
-------------------------------------------------------------------------------
-- Dependencies: parseParam(); setRanks(); parseInput(); sourced();
-- propertyvalueandquals(); assembleoutput();
-- labelOrId(); i18n.latestdatequalifier(); format_Date();
-- findLang(); makeOrdinal(); roundto(); decimalPrecision(); decimalToDMS();
-------------------------------------------------------------------------------
p.getQualifierValue = function(frame)

	-- The property ID that will have a qualifier is the first unnamed parameter
	local propertyID = mw.text.trim(frame.args[1] or "")

	-- The value of the property we want to match whose qualifier value is to be returned
	-- is passed in named parameter |pval=
	local propvalue = frame.args.pval

	-- The property ID of the qualifier
	-- whose value is to be returned is passed in named parameter |qual=
	local qualifierID = frame.args.qual

	-- onlysourced is a boolean passed to return qualifiers
	-- only when property values are sourced to something other than Wikipedia
	-- if nothing or an empty string is passed set it true
	-- if "false" or "no" or 0 is passed set it false
	local onlysrc = parseParam(frame.args.onlysourced or frame.args.osd, true)

	-- set a language object in the frame.args table
	frame.args.langobj = findLang(frame.args.lang)

	-- set the requested ranks flags
	frame.args.reqranks = setRanks(frame.args.rank)
	
	-- set the maximun number of returns
	local maxvals = tonumber(frame.args.maxvals) or -1

	-- check for locally supplied parameter in second unnamed parameter
	-- success means no local parameter and the property exists
	local qid, props = parseInput(frame, frame.args[2], propertyID)
	if qid then
		local out = {}
		-- Scan through the values of the property
		-- we want something like property is P793, significant event (in propertyID)
		-- whose value is something like Q385378, construction (in propvalue)
		-- then we can return the value(s) of a qualifier such as P580, start time (in qualifierID)
		for k1, v1 in pairs(props) do
			if v1.mainsnak.snaktype == "value" and v1.mainsnak.datavalue.type == "wikibase-entityid" then
				-- It's a wiki-linked value, so check if it's the target (in propvalue)
				-- and if it has qualifiers
				if v1.qualifiers then -- v1.mainsnak.datavalue.value.id == propvalue and 
					if onlysrc == false or sourced(v1) then
						-- if we've got this far, we have a (sourced) claim with qualifiers
						-- which matches the target, so find the value(s) of the qualifier we want
						local quals = v1.qualifiers[qualifierID]
						if quals then
							local vals = propertyvalueandquals(quals, frame.args, qid)
							for k, v in pairs(vals) do
								out[#out + 1] = labelOrId(v1.mainsnak.datavalue.value.id) .. ":" .. v
							end
						end
					end -- of check for sourced
				end -- of check for matching required value and has qualifiers
			end -- of check for wikibase entity
			if maxvals > 0 and #out >= maxvals then break end
		end -- of loop through values of propertyID
		return assembleoutput(out, frame.args, qid, propertyID)
	else
		return props -- either local parameter or nothing
	end -- of test for success
	return nil
end


-------------------------------------------------------------------------------
-- getValueByQual gets the value of a property which has a qualifier with a given entity value
-- The call needs:
--					a property ID (the unnamed parameter or 1=Pxxx)
--					the ID of a qualifier for that property (qualID=Pyyy)
--					the Wikibase-entity ID of a value for that qualifier (qvalue=Qzzz)
-- The usual whitelisting, blacklisting, onlysourced, etc. are implemented
-------------------------------------------------------------------------------
-- Dependencies: parseParam(); setRanks(); parseInput(); sourced();
-- assembleoutput();
-------------------------------------------------------------------------------
p.getValueByQual = function(frame)

	-- The property ID that will have a qualifier is the first unnamed parameter
	local propertyID = mw.text.trim(frame.args[1] or "")
	if propertyID == "" then return "no property supplied" end

	-- The property ID of the qualifier with a particular value is in named parameter |qualID=
	local qualID = frame.args.qualID or ""
	if qualID == "" then return "no qualifier supplied" end

	-- The Q-id of the value for the qualifier we want to match is in named parameter |qvalue=
	local qval = frame.args.qvalue or ""
	if qval == "" then return "no qualifier value supplied" end

	-- onlysourced is a boolean passed to return property values
	-- only when property values are sourced to something other than Wikipedia
	-- if nothing or an empty string is passed set it true
	-- if "false" or "no" or 0 is passed set it false
	local onlysrc = parseParam(frame.args.onlysourced or frame.args.osd, true)

	-- set the requested ranks flags
	frame.args.reqranks = setRanks(frame.args.rank)

	-- check for locally supplied parameter in second unnamed parameter
	-- success means no local parameter and the property exists
	local qid, props = parseInput(frame, frame.args[2], propertyID)

	if qid then
		local out = {}
		-- Scan through the values of the property
		-- we want something like property is "pronunciation audio (P443)" in propertyID
		-- with a qualifier like "language of work or name (P407)" in qualID
		-- whose value has the required ID, like "British English (Q7979)", in qval
		for k1, v1 in pairs(props) do
			if v1.mainsnak.snaktype == "value" and v1.mainsnak.datavalue.type == "string" then
				-- We'll only deal with returning strings for now
				-- so check if it has the right qualifier
				local v1q = v1.qualifiers
				if v1q and v1q[qualID] then
					if onlysrc == false or sourced(v1) then
						-- if we've got this far, we have a (sourced) claim with qualifiers
						-- so see if matches the required value
						-- We'll only deal with wikibase-items for now
						if v1q[qualID][1].datatype == "wikibase-item" then
							if v1q[qualID][1].datavalue.value.id == qval then
								out[#out + 1] = v1.mainsnak.datavalue.value
							end
						end
					end -- of check for sourced
				end -- of check for matching required value and has qualifiers
			else
				return "not string"
			end -- of check for string
		end -- of loop through values of propertyID
		return assembleoutput(out, frame.args, qid, propertyID)
	else
		return props -- either local parameter or nothing
	end -- of test for success
	return nil
end


-------------------------------------------------------------------------------
-- getValueByLang gets the value of a property which has a qualifier P407
-- ("language of work or name") whose value has the given language code
-- The call needs:
--					a property ID (the unnamed parameter or 1=Pxxx)
--					the MediaWiki language code to match the language (lang=xx[-yy])
--					(if no code is supplied, it uses the default language)
-- The usual whitelisting, blacklisting, onlysourced, etc. are implemented
-------------------------------------------------------------------------------
-- Dependencies: parseParam(); setRanks(); parseInput(); sourced();
-- assembleoutput();
-------------------------------------------------------------------------------
p.getValueByLang = function(frame)

	-- The property ID that will have a qualifier is the first unnamed parameter
	local propertyID = mw.text.trim(frame.args[1] or "")
	if propertyID == "" then return "no property supplied" end

	-- The property ID of the qualifier "language of work or name"
	local qualID = "P407"

	-- The language code for the qualifier we want to match is in named parameter |lang=
	local langcode = frame.args.lang or ""
	if langcode == "" then
		langcode = frame:callParserFunction{ name = "int", args = "lang" }
	end

	-- onlysourced is a boolean passed to return property values
	-- only when property values are sourced to something other than Wikipedia
	-- if nothing or an empty string is passed set it true
	-- if "false" or "no" or 0 is passed set it false
	local onlysrc = parseParam(frame.args.onlysourced or frame.args.osd, true)

	-- set the requested ranks flags
	frame.args.reqranks = setRanks(frame.args.rank)

	-- check for locally supplied parameter in second unnamed parameter
	-- success means no local parameter and the property exists
	local qid, props = parseInput(frame, frame.args[2], propertyID)

	if qid then
		local out = {}
		-- Scan through the values of the property
		-- we want something like property is "pronunciation audio (P443)" in propertyID
		-- with qualifier "language of work or name (P407)" in qualID
		-- whose value has the ID, matching the language code
		-- like "British English (Q7979)" matches "en-gb"
		for k1, v1 in pairs(props) do
			if v1.mainsnak.snaktype == "value" and v1.mainsnak.datavalue.type == "string" then
				-- We'll only deal with returning strings for now
				-- so check if it has the right qualifier
				local v1q = v1.qualifiers
				if v1q and v1q[qualID] then
					if onlysrc == false or sourced(v1) then
						-- if we've got this far, we have a (sourced) claim with qualifiers
						-- so see if matches the required value
						-- We'll only deal with wikibase-items for now
						if v1q[qualID][1].datatype == "wikibase-item" then
							local qlid = v1q[qualID][1].datavalue.value.id
							-- qlid should represent a language like "British English (Q7979)"
							-- it should have string property "Wikimedia language code (P424)"
							-- qlcode will be a table:
							local qlcode = mw.wikibase.getBestStatements(qlid, "P424")
							if (#qlcode > 0) and (qlcode[1].mainsnak.datavalue.value == langcode) then
								out[#out + 1] = v1.mainsnak.datavalue.value
							end
						end
					end -- of check for sourced
				end -- of check for has qualifiers
			else
				return "not string"
			end -- of check for string
		end -- of loop through values of propertyID
		return assembleoutput(out, frame.args, qid, propertyID)
	else
		return props -- either local parameter or nothing
	end -- of test for success
	return nil
end


-------------------------------------------------------------------------------
-- getLink has the qid of a Wikidata entity passed as the first unnamed parameter or as |qid=
-- If there is a sitelink to an article on the local Wiki, it returns a link to the article
-- with the Wikidata label as the displayed text.
-- If there is no sitelink, it returns the label as plain text.
-- If there is no label in the local language, it displays the qid instead.
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
p.getLink = function(frame)
	local itemID = mw.text.trim(frame.args[1] or frame.args.qid or "")
	if itemID == "" then return end
	local sitelink = mw.wikibase.sitelink(itemID)
	local label = labelOrId(itemID)
	if sitelink then
		return "[[" .. sitelink .. "|" .. label .. "]]"
	else
		return label
	end
end


-------------------------------------------------------------------------------
-- getLabel has the qid of a Wikidata entity passed as the first unnamed parameter or as |qid=
-- It returns the Wikidata label for the local language as plain text.
-- If there is no label in the local language, it displays the qid instead.
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
p.getLabel = function(frame)
	local itemID = mw.text.trim(frame.args[1] or frame.args.qid or "")
	if itemID == "" then return end
	local label = labelOrId(itemID)
	return label
end


-------------------------------------------------------------------------------
-- getAT has the qid of a Wikidata entity passed as the first unnamed parameter or as |qid=
-- If there is a sitelink to an article on the local Wiki, it returns the sitelink as plain text.
-- If there is no sitelink, it returns nothing.
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
p.getAT = function(frame)
	local itemID = mw.text.trim(frame.args[1] or frame.args.qid or "")
	if itemID == "" then return end
	return mw.wikibase.sitelink(itemID)
end


-------------------------------------------------------------------------------
-- getDescription has the qid of a Wikidata entity passed as |qid=
-- (it defaults to the associated qid of the current article if omitted)
-- and a local parameter passed as the first unnamed parameter.
-- Any local parameter passed (other than "Wikidata" or "none") becomes the return value.
-- It returns the article description for the Wikidata entity if the local parameter is "Wikidata".
-- Nothing is returned if the description doesn't exist or "none" is passed as the local parameter.
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
p.getDescription = function(frame)
	local desc = mw.text.trim(frame.args[1] or "")
	local itemID = mw.text.trim(frame.args.qid or "")
	if itemID == "" then itemID = nil end
	if desc:lower() == 'wikidata' then
		return mw.wikibase.description(itemID)
	elseif desc:lower() == 'none' then
		return nil
	else
		return desc
	end
end


-------------------------------------------------------------------------------
-- pageId returns the page id (entity ID, Qnnn) of the current page
-- returns nothing if the page is not connected to Wikidata
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
function p.pageId(frame)
	return mw.wikibase.getEntityIdForCurrentPage()
end


-------------------------------------------------------------------------------
-- formatDate is a wrapper to export the private function format_Date
-------------------------------------------------------------------------------
-- Dependencies: format_Date();
-------------------------------------------------------------------------------
p.formatDate = function(frame)
	return format_Date(frame.args[1], frame.args.df, frame.args.bc)
end


-------------------------------------------------------------------------------
-- checkBlacklist allows a test to check whether a named field is allowed
-- returns true if the field is not blacklisted (i.e. allowed)
-- returns false if the field is blacklisted (i.e. disallowed)
-- {{#if:{{#invoke:WikidataIB |checkBlacklist |name=Joe |suppressfields=Dave; Joe; Fred}} | not blacklisted | blacklisted}}
-- displays "blacklisted"
-- {{#if:{{#invoke:WikidataIB |checkBlacklist |name=Jim |suppressfields=Dave; Joe; Fred}} | not blacklisted | blacklisted}}
-- displays "not blacklisted"
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
p.checkBlacklist = function(frame)
	local blacklist = frame.args.suppressfields or frame.args.spf or ""
	local fieldname = frame.args.name or ""
	if blacklist ~= "" and fieldname ~= "" then
		if blacklist:find(fieldname) then
			return false
		else
			return true
		end
	else
		-- one of the fields is missing: let's call that "not on the list"
		return true
	end
end


-------------------------------------------------------------------------------
-- emptyor returns nil if its first unnamed argument is just punctuation, whitespace or html tags
-- otherwise it returns the argument unchanged (including leading/trailing space).
-- If the argument may contain "=", then it must be called explicitly:
-- |1=arg
-- (In that case, leading and trailing spaces are trimmed)
-- It finds use in infoboxes where it can replace tests like:
-- {{#if: {{#invoke:WikidatIB |getvalue |P99 |fwd=ALL}} | <span class="xxx">{{#invoke:WikidatIB |getvalue |P99 |fwd=ALL}}</span> | }}
-- with a form that uses just a single call to Wikidata:
-- {{#invoke |WikidataIB |emptyor |1= <span class="xxx">{{#invoke:WikidataIB |getvalue |P99 |fwd=ALL}}</span> }}
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
p.emptyor = function(frame)
	local s = frame.args[1] or ""
	if s == "" then return nil end
	local sx = s:gsub("%s", ""):gsub("<[^>]*>", ""):gsub("%p", "")
	if sx == "" then
		return nil
	else
		return s
	end
end


-------------------------------------------------------------------------------
-- labelorid is a public function to expose the output of labelOrId()
-- Pass the Q-number as |qid= or as an unnamed parameter.
-- It returns the Wikidata label for that entity or the qid if no label exists.
-------------------------------------------------------------------------------
-- Dependencies: labelOrId
-------------------------------------------------------------------------------
p.labelorid = function(frame)
	local label = labelOrId( frame.args.qid or frame.args[1] )
	return label
end


-------------------------------------------------------------------------------
-- getLang returns the MediaWiki language code of the current content.
-- If optional parameter |style=full, it returns the language name.
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
p.getLang = function(frame)
	local style = (frame.args.style or ""):lower()
	local langcode = mw.language.getContentLanguage().code
	if style == "full" then
		return mw.language.fetchLanguageName( langcode )
	end
	return langcode
end


-------------------------------------------------------------------------------
-- getQid returns the qid, if supplied
-- failing that, the Wikidata entity ID of the "category's main topic (P301)", if it exists
-- failing that, the Wikidata entity ID asociated with the curent page, if it exists
-- otherwise, nothing
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
p.getQid = function(frame)
	local qid = (frame.args.qid or ""):upper()
	-- check if a qid was passed; if so, return it:
	if qid ~= "" then return qid end
	-- check if there's a "category's main topic (P301)":
	local qid = mw.wikibase.getEntityIdForCurrentPage()
	if qid then
		local prop301 = mw.wikibase.getBestStatements(qid, "P301")
		if prop301[1] then
			local mctid = prop301[1].mainsnak.datavalue.value.id
			if mctid then return mctid end
		end
	end
	-- otherwise return the page qid (if any)
	return qid
end


-------------------------------------------------------------------------------
-- formatNumber formats a number according to the the supplied language code ("|lang=")
-- or the default language if not supplied.
-- The number is the first unnamed parameter or "|num="
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
p.formatNumber = function(frame)
	local lang
	local num = tonumber(frame.args[1] or frame.args.num) or 0
	lang = findLang(frame.args.lang)
	return lang:formatNum( num )
end

-------------------------------------------------------------------------------
-- examine dumps the property (the unnamed parameter) from the item given by the parameter 'qid'
-- or from the item corresponding to the current page if qid is not supplied.
-------------------------------------------------------------------------------
-- Dependencies: none
-------------------------------------------------------------------------------
p.examine = function( frame )
	pid = mw.text.trim( frame.args[1] or frame.args.pid or "" )
	if pid == "" then return "No property supplied" end
	qid = frame.args.qid or ""
	if qid == "" then qid = mw.wikibase.getEntityIdForCurrentPage end
	if not qid then return "No item for this page" end
	return mw.dumpObject( mw.wikibase.getAllStatements( qid, pid ) )
end

-- getValueQualIndirect scans a property prop1 in the current page (or another page if qid is given)
-- for each value of the property that is a wikibase item, it fetches all of the values of prop2
-- and for each value of prop2 it also retrieves each qualifier and its value
p.getValueQualIndirect = function(frame)
	local qid = frame.args.qid or ""
	if qid == "" then qid = nil end
	local prop1 = frame.args.prop1 or ""
	if prop1 == "" then return "No prop1" end
	local prop2 = frame.args.prop2 or ""
	if prop2 == "" then return "No prop2" end
	
	local ent1 = mw.wikibase.getEntity(qid)
	if not ent1 then return "No Wikidata entry" end
	if not ent1.claims then return "No claims" end
	
	local props1 = ent1.claims[prop1]
	if not props1 then return "No properties" end
	local out = ""
	for k1, v1 in pairs(props1) do
		if v1.mainsnak.datatype  == "wikibase-item" then
			local qval1 = v1.mainsnak.datavalue.value.id
			local label1 = mw.wikibase.label(qval1)
			if label1 then
				label1 = mw.text.nowiki(label1)
			else
				label1 = qval1
			end
			-- start building an output string
			out = out .. "<br>" .. label1 .. "<br>"
			-- look at entry for qval and get its prop2 values
			local ent2 = mw.wikibase.getEntity(qval1)
			if ent2.claims and ent2.claims[prop2] then
				for k2, v2 in pairs(ent2.claims[prop2]) do
					if v2.mainsnak.datatype  == "wikibase-item" then
						local qval2 = v2.mainsnak.datavalue.value.id
						local label2 = mw.wikibase.label(qval2)
						if label2 then
							label2 = mw.text.nowiki(label2)
						else
							label2 = qval2
						end
						out = out .. "+ " .. label2 .. "<br>"
						-- scan through qualifiers
						if v2.qualifiers then
							for k3, v3 in pairs(v2.qualifiers) do
								for k4, v4 in pairs(v3) do
									local val = ""
									-- handler for wikibase-item
									if v4.datatype == "wikibase-item" then
										val = v4.datavalue.value.id
										val = mw.wikibase.label(val) or val
									else
										val = mw.wikibase.renderSnak(v4)
									end
									-- assemble qualifiers
									out = out .. "++ " .. (mw.wikibase.label(k3) or k3) .. " = " .. val .. "<br>"
								end -- loop through posible multiple qual values
							end -- loop through qualifiers
						end -- test for qualifiers
					end -- test for wikibase item
				end -- loop through props2 values
			end -- test for claims in indirect item
		end -- test for wikibase item
	end -- loop through props1 values
	return out
end

p.getValueIndirect = function(frame)
	local property1 = mw.text.trim(frame.args[1] or "")
	local property2 = mw.text.trim(frame.args[2] or "")
	
	-- Can take a named parameter |qid which is the Wikidata ID for the article.
	-- This will not normally be used because it's an expensive call.
	local qid1 = frame.args.qid
	if qid1 and (#qid1 == 0) then qid1 = nil end

	local entity1 = mw.wikibase.getEntityObject(qid1)
	local props1
	if entity1 and entity1.claims then
		props1 = entity1.claims[property1]
	end
	if props1 then
		-- Check that the first value of the property is a wikibase-item
		if props1[1].mainsnak.datatype == "wikibase-item" then
			local qid2 = props1[1].mainsnak.datavalue.value.id
			local entity2 = mw.wikibase.getEntityObject(qid2)
			if entity2.claims then
				-- only need props2 if we want a more sophisticated parsing, e.g. mdy dates
				-- local props2 = entity2.claims[property2]
				return entity2:formatPropertyValues(property2).value
			else
				return qid2 .. " has no claims."
			end
		else
			return "not wikibase-item: " .. props1[1].mainsnak.datatype --debug
		end
	end
	return "no claims"
end

return p