Property talk:P4801

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LoC and MARC vocabularies ID
identifier for an item in one of the controlled vocabularies maintained by the Library of Congress

Represents	MARC standards (Q722609)
Associated item	Library of Congress (Q131454)
Applicable "stated in" value	Library of Congress Linked Data Service (Q17109002)
Data type	External identifier
Allowed values	[a-z][a-zA-Z0-9-]+(/[a-zA-Z0-9][a-zA-Z0-9-]*){1,2}.{3,100}
Example	globe (Q133792) → resourceTypes/glo (RDF) Geographic Names Server (Q1194038) → subjectSchemes/geonet (RDF) costume designer (Q1323191) → relators/cst (RDF) Newfoundland and Labrador (Q2003) → geographicAreas/n-cn-nf (RDF) encyclopedia (Q5292) → marcgt/enc (RDF) Finnish (Q1412) → languages/fin (RDF) JPEG File Interchange Format (JFIF) (Q26329975) → mencformat/jpeg (RDF) NTSC (Q185796) → mbroadstd/ntsc (RDF) black-and-white (Q838368) → mcolor/blw (RDF) surround sound (Q569874) → mplayback/mul (RDF) table-book (Q7673115) → mmusicformat/tablebk (RDF)
Formatter URL	https://id.loc.gov/vocabulary/$1.html https://id.loc.gov/vocabulary/$1.nt https://id.loc.gov/vocabulary/$1.rdf https://id.loc.gov/vocabulary/$1.json
See also	Library of Congress authority ID (P244), Code List for Cultural Heritage Organizations (P3234), Thesaurus for Graphic Materials ID (P5160), BARTOC ID (P2689)
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 Mix'n'match (Report) Database reports/Complex constraint violations/P4801 Database reports/Constraint violations/P4801 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 2,753 Main statement 2,736 99.4% of uses Qualifier 11 0.4% of uses Reference 6 0.2% of uses
Search for values

[create Create a translatable help page (preferably in English) for this property to be included here]

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).
List of violations of this constraint: Database reports/Constraint violations/P4801#Unique value, SPARQL (every item), SPARQL (by value)

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

List of violations of this constraint: Database reports/Constraint violations/P4801#Format, hourly updated report, SPARQL

Format “.{3,100}”: value must be formatted using this pattern (PCRE syntax). (Help)

List of violations of this constraint: Database reports/Constraint violations/P4801#Format, hourly updated report, SPARQL

Allowed entity types are Wikibase item (Q29934200), Wikibase property (Q29934218): 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/P4801#Entity types

Scope is as main value (Q54828448): 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/P4801#Scope, SPARQL

Check prefix 'languages'
(Help)
Violations query: SELECT ?item ?value ?marc { ?item wdt:P220 ?value. ?item wdt:P4801 ?marc. BIND (SUBSTR(?marc, 1, 9) AS ?prefix). FILTER (?prefix NOT IN ("languages")) }
List of this constraint violations: Database reports/Complex constraint violations/P4801#Check prefix 'languages'

Check prefixes
(Help)
Violations query: SELECT ?item ?marc ?prefix { ?item wdt:P4801 ?marc. BIND (STRBEFORE(?marc, "/") AS ?prefix). FILTER (?prefix NOT IN ("countries", "languages", "relators", "geographicAreas", "subjectSchemes", "marcgt", "ethnographicTerms", "resourceTypes", "identifiers", "organizations")) }
List of this constraint violations: Database reports/Complex constraint violations/P4801#Check prefixes

Check prefix 'ethnographicTerms'
(Help)
Violations query: SELECT ?item ?marc ?prefix { ?item wdt:P4801 ?marc. BIND (STRBEFORE(?marc, "/") AS ?prefix). FILTER (?prefix IN ("ethnographicTerms")) FILTER (REGEX(?marc, "^(ethnographicTerms\\/afset\\d{6})$") = false) }
List of this constraint violations: Database reports/Complex constraint violations/P4801#Check prefix 'ethnographicTerms'

Other LoC authority and vocabulary properties

Query: https://w.wiki/bRT

Specific specialised properties exist for the following vocabularies

• Code List for Cultural Heritage Organizations (P3234)
• Thesaurus for Graphic Materials ID (P5160)
• Library of Congress Medium of Performance Thesaurus ID (P8516)
• American Folklore Society Ethnographic Thesaurus ID (P8540)

Jheald (talk) 14:07, 6 September 2020 (UTC)

Yes, for example the first one P3234 is a bit of a duplication Back ache (talk) 10:29, 18 August 2022 (UTC)

Single value constraint is problematic on this property

There is no separate property for the LC-maintained MARC List for Countries available at https://id.loc.gov/vocabulary/countries.html. There are 5 separate properties for different forms of ISO 3166 codes, but this vocabulary states about itself: "The MARC country codes are not the same as the ISO 3166 country codes, although the lists are entity-compatible so that a simple translation could relate codes for the same entity. The records for the codes contain references to the equivalent ISO 3166 codes."

The vocabularies accessible at https://id.loc.gov include MARC List for Countries and MARC List for Geographic Areas (https://id.loc.gov/vocabulary/geographicAreas.html) and most countries and provinces/states in the US, Canada, and Australia are represented by different codes in both. Example: https://www.wikidata.org/wiki/Q824

https://id.loc.gov/vocabulary/countries/oru.html

https://id.loc.gov/vocabulary/geographicAreas/n-us-or.html

There are probably other concepts that are represented by more than one vocabulary at an https://id.loc.gov/vocabulary URI, but the Countries/Geographic Areas example is the most obvious example of why lumping "LoC and MARC vocabularies ID" into one property is a shortcut we can't make if we want to enforce a single value constraint on it.

As some library bibliographic data records country codes and other library bibliographic data records geographic area codes, it is valuable for Wikidata in its role as an ID-linking hub to capture both.

--Infomuse (talk) 16:22, 14 July 2021 (UTC)

Agree. There were other exceptions, eg "notated music", "spoken text". So I removed the constraint. Vladimir Alexiev (talk) 22:08, 15 August 2022 (UTC)

Work ID?

Is this property also applicable to a work id from id.loc.gov? E.g., North American Wild Flowers (works/9671638). Thank you. jshieh (talk) 14:19, 23 September 2021 (UTC)

Problematic for identifier properties

The LoC "identifiers" namespace corresponds to Wikidata's "external-id" properties. Eg "gettytgn", "gettyulan", "viaf".

But this prop applies to items not properties. So I've been using "Equivalent property" instead. Vladimir Alexiev (talk) 22:12, 15 August 2022 (UTC)

‎Examples:

• GNIS ID (P590)‎‎ equivalent property (P1628): https://id.loc.gov/vocabulary/identifiers/gnis
• MeSH concept ID (P6694) external superproperty (P2235): https://id.loc.gov/vocabulary/identifiers/mesh

Vladimir Alexiev (talk) 22:18, 15 August 2022 (UTC)