Property talk:P1893

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Open Plaques plaque ID
identifier for a commemorative plaque, on a building or other structure in Open Plaques

Represents	commemorative plaque (Q721747)
Associated item	Open Plaques (Q23018437)
Applicable "stated in" value	Open Plaques (Q23018437)
Data type	External identifier
Domain	According to this template: Buildings; other structures According to statements in the property: commemorative plaque (Q721747) When possible, data should only be stored as statements
Allowed values	[0-9]+
Example	Birmingham Repertory Theatre (Q4916786) → 1576 Middleton Railway (Q1931930) → 861 Margaret McMillan (Q3290510) → 5280
Source	https://openplaques.org/
Formatter URL	https://openplaques.org/plaques/$1
Related to country	United Kingdom (Q145) (See 325 others)
See also	Open Plaques subject ID (P1430), Florida Historical Marker List ID (P6567), Historical Marker Database ID (P7883), Indiana State Historical Marker Program ID (P9546), NC Highway Historical Marker Program ID (P9492), Nevada SHPO marker ID (P9515)
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/P1893 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 1,269 Main statement 1,237 out of 50,572 (2% complete) 97.5% of uses Qualifier 5 0.4% of uses Reference 27 2.1% of uses
Search for values

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Single value: this property generally contains a single value. (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/P1893#Single 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).
List of violations of this constraint: Database reports/Constraint violations/P1893#Unique value, SPARQL (every item), SPARQL (by value)

Format “[1-9]\d*”: value must be formatted using this pattern (PCRE syntax). (Help)

List of violations of this constraint: Database reports/Constraint violations/P1893#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/P1893#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/P1893#Scope, SPARQL

Type “commemorative plaque (Q721747)”: item must contain property “instance of (P31), subclass of (P279)” with classes “commemorative plaque (Q721747)” 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/P1893#Type Q721747, SPARQL

Item “main subject (P921)”: Items with this property should also have “main subject (P921)”. (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/P1893#Item P921, search, SPARQL

Item “commemorates (P547)”: Items with this property should also have “commemorates (P547)”. (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/P1893#Item P547, search, SPARQL

Adding constraints - type and main subject

I added type and main subject constraints to distinguish how and where the id is applied. The OpenPlaque ID represents a commemorative plaque about a subject, but often is being applied to subjects directly. These constraints may affect the way OpenPlaque IDs are applied, but splitting the commemorative plaque to its own Q enables distinguishing the subject of the plaque from the plaque object about the subject allowing for the plaque Q to be linked and managed separately from the subject while retaining the relationship.