Property talk:P4272

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DPLA subject term
term for an item's subject area in the Digital Public Library of America

Description	identifier for a subject area in the Digital Public Library of America
Associated item	Digital Public Library of America (Q2944483)
Applicable "stated in" value	Digital Public Library of America (Q2944483)
Data type	External identifier
Domain	Digital Public Library of America (Q2944483) (note: this should be moved to the property statements)
Allowed values	According to this template: [^\s\/]+ According to statements in the property: [^\s/].* When possible, data should only be stored as statements
Example	animal (Q729) → "Animalia" Animalia Unisphere (Q717956) → "Unisphere%20(New%20York,%20N.Y.)" Unisphere (New York, N.Y.)
Source	https://dp.la/search
External links	Use in sister projects: [ar] • [de] • [en] • [es] • [fr] • [he] • [it] • [ja] • [ko] • [nl] • [pl] • [pt] • [ru] • [sv] • [vi] • [zh] • [commons] • [species] • [wd] • [en.wikt] • [fr.wikt].
Formatter URL	https://dp.la/search?subject="$1"
Related to country	United States of America (Q30) (See 771 others)
See also	DPLA ID (P760)
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/Constraint violations/P4272 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 1,341 Main statement 1,336 99.6% of uses Qualifier 2 0.1% of uses Reference 3 0.2% of uses
Search for values

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

Format “[^\s/].*”: value must be formatted using this pattern (PCRE syntax). (Help)

List of violations of this constraint: Database reports/Constraint violations/P4272#Format, hourly updated report, SPARQL

Allowed entity types are Wikibase item (Q29934200), Wikibase MediaInfo (Q59712033): 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/P4272#Entity types

Scope is as main value (Q54828448), as reference (Q54828450): 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/P4272#Scope, SPARQL

Change scope

This property makes very little sense as currently scoped. "subject" is an uncontrolled, non-unique field in the DPLA data model. The URL formatter just links to a search query. There is no guarantee that all of the items in the linked query are actually related to the Wikidata item, and some of the ones currently in use surely have false positives ("Baltimore," "Maine," etc.). In fact, this is not really an ID at all, just a field in the data, and DPLA has never referred to it as such. And the link is not a URI where the term is defined, just an advanced search URL. What makes more sense is for this property not to be applied to Wikidata items about terms, as it currently is, but applied to items about DPLA works, to mark those works' subjects, as described by cataloging institution. For example, it makes more sense to apply DPLA subject term (P4272)Urban parks at M9737159, as per that specific catalog record, than at urban park (Q22746). Dominic (talk) 00:10, 8 February 2022 (UTC)