Property talk:P305

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IETF language tag
identifier for language or languoid per the Internet Engineering Task Force; can include a primary language subtag, subtags for script, region, variant, extension, or private-use. Format: 2 or 3 letters, followed by "-" if subtags present

Data type	External identifier
Template parameter	|ietf= in w:fr:Template:Infobox Langue
Domain	languoid (Q17376908), orthography (Q43091), keyboard layout (Q725744) or spurious language (Q5015649)
Allowed values	([a-z]{2,3}(-[A-Z][a-z]{3})?(-([A-Z]{2}|[0-9]{3}))?(-[a-z0-9]{5,8})*(-u-sd-[a-z]{2}[a-z0-9]{1,3})?|i-[a-z]{3,8}|art-x-[a-z]{4,8})([a-z]{2,3}(-[a-zA-Z0-9]{1,8})*|i-[a-z]{3,8})|
Example	British English (Q7979) → en-GB Hungarian (Q9067) → hu Arabic (101) (Q112882452) → ar-SA
Source	According to this template: w:en:IETF language tag, allowed "subtags" are registered in http://www.iana.org/assignments/language-subtag-registry/language-subtag-registry According to statements in the property: http://www.iana.org/assignments/language-subtag-registry/language-subtag-registry When possible, data should only be stored as statements
See also	ISO 639-1 code (P218), ISO 639-2 code (P219), ISO 3166-1 alpha-2 code (P297), ISO 3166-2 code (P300), ISO 15924 alpha-4 code (P506)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other external identifier Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Database reports/Complex constraint violations/P305 Database reports/Constraint violations/P305 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 9,030 Main statement 9,022 >99.9% of uses Qualifier 7 <0.1% of uses Reference 1 <0.1% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Type “languoid (Q17376908), orthography (Q43091), keyboard layout (Q725744), spurious language (Q5015649)”: item must contain property “instance of (P31)” with classes “languoid (Q17376908), orthography (Q43091), keyboard layout (Q725744), spurious language (Q5015649)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P305#Type Q17376908, Q43091, Q725744, Q5015649, SPARQL

Format “([a-z]{2,3}(-[A-Z][a-z]{3})?(-([A-Z]{2}|[0-9]{3}))?(-[a-z0-9]{5,8})*(-u-sd-[a-z]{2}[a-z0-9]{1,3})?|i-[a-z]{3,8}|art-x-[a-z]{4,8})”: value must be formatted using this pattern (PCRE syntax). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). Known exceptions: Flemish Sign Language (Q2107617), French Belgian Sign Language (Q3217332), Swiss-German Sign Language (Q35150), Nynorsk (Q25164), Bokmål (Q25167), Southern Min (Q36495), Min Chinese (Q56504), traditional German orthography (Q58483619), Oxford spelling (Q2273977), Saraiki (Q33902), Punjabi (Q58635), Shahmukhi (Q133800), Gurmukhi (Q689894), Saraiki Shahmukhi (Q113406611), Urdu orthography (Q112887037)
List of violations of this constraint: Database reports/Constraint violations/P305#Format, SPARQL

Single best value: this property generally contains a single value. If there are several, one would have preferred rank (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). Known exceptions: Llanito (Q79388), Shahmukhi (Q133800), Gurmukhi (Q689894), Punjabi (Q58635), Azerbaijani (Q9292), Saraiki (Q33902), Balochi (Q33049), Yem (Q36873), Ndonga (Q33900), Kwanyama (Q1405077), Ovambo (Q36489), Saraiki Shahmukhi (Q113406611), Urdu orthography (Q112887037)
List of violations of this constraint: Database reports/Constraint violations/P305#single best value, SPARQL

Distinct values: this property likely contains a value that is different from all other items. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). Known exceptions: Church Slavonic (Q33251), Old Church Slavonic (Q35499), Punjabi (Q58635), Ovambo (Q36489), Ndonga (Q33900), Kwanyama (Q1405077), Shahmukhi (Q133800), Urdu orthography (Q112887037)
List of violations of this constraint: Database reports/Constraint violations/P305#Unique value, SPARQL (every item), SPARQL (by value)

Conflicts with “instance of (P31): Wikimedia disambiguation page (Q4167410)”: this property must not be used with the listed properties and values. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P305#Conflicts with P31, search, SPARQL

Format “([a-z]{2,3}(-[a-zA-Z0-9]{1,8})*|i-[a-z]{3,8})|”: value must be formatted using this pattern (PCRE syntax). (Help)

List of violations of this constraint: Database reports/Constraint violations/P305#Format, hourly updated report, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P305#Entity types

Scope is as main value (Q54828448), as qualifier (Q54828449): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P305#Scope, SPARQL

This property is being used by: hy:Կաղապար:Տեղեկաքարտ Լեզու, hy:Կաղապար:Տեղեկաքարտ Լեզու արւմտ. ia:Patrono:Infobox/typo/languoid, ia:Patrono:Infobox/articulo/lingua fr:Modèle:Infobox Langue ang:Bysen:Cyþþubox sprǣc ca:Plantilla:Infotaula de llengua, ca:Plantilla:Infotaula llengua vec:Modeło:Infobox de Łéngua ga:Teimpléad:WD Bosca Sonraí Teanga Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)

Wikipedia categories
categories combining article with other language external link (Q28373483) or article containing other language text (Q28368760) should also have P971 with a language-tag (Help)
Violations query: SELECT ?item ?lang { { ?item wdt:P971 wd:Q28373483 } UNION { ?item wdt:P971 wd:Q28368760 } FILTER NOT EXISTS { ?item wdt:P971 / wdt:P305 [] } OPTIONAL { ?item wdt:P971 ?lang . ?lang wdt:P31/wdt:P279* wd:Q17376908 } }
List of this constraint violations: Database reports/Complex constraint violations/P305#Wikipedia categories

constraint report relating to Wikimedia disambiguation page (Q4167410)

If instance of (P31) is a Wikimedia disambiguation page (Q4167410) the presence of IETF language tag (P305) is prohibited.

see: Wikimedia disambiguation page (Q4167410) with IETF language tag (P305) gangLeri לערי ריינהארט (talk) 15:11, 19 May 2014 (UTC)

should support other documents (e.g. HTTP/1.0 (Q31207264)

d1g (talk) 13:42, 30 June 2017 (UTC)

Regular expression

The regular expression for checking values of IETF language tag (P305) is currently a little too strict. For example, the IETF language tag for traditional German orthography (Q58483619) is 'de-1901', which is currently getting flagged as a constraint violation although the tag is correct. — Sascha (talk) 11:16, 8 February 2019 (UTC)

It's an exception (they don't create tags in that format any more) so I've added it as one. - Nikki (talk) 15:38, 18 April 2020 (UTC)