Property talk:P7883

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Historical Marker Database ID
database entries of historical markers

Applicable "stated in" value	Historical Marker Database (Q21815238)
Data type	External identifier
Domain	commemorative plaque (Q721747)
Allowed values	[0-9]+
Example	Stage House Tavern (Q67503613) → 94038 Blackwells Mills Canal House (Q4923612) → 94091 Millstone School House (Q75829450) → 37166 William L. Hutcheson Memorial Forest (Q14705640) → 99139 Bridgewater station (Q4966831) → 139393 Van Horne House (Q48895869) → 99260 Kingston Presbyterian Church (Q73331165) → 122266 Rockingham (Q7355375) → 33222 Kingston Presbyterian Church cemetery (Q73332954) → 33194 Opie - Vanderveer Cemetery (Q83196475) → 96151 Maybury Hill (Q6796997) → 64133 Landing Lane Bridge (Q6484602) → 109273 Kirkpatrick Chapel (Q15238589) → 10016 Old Queens (Q7084807) → 62695 Winants Hall (Q18159219) → 10018 Elizabeth Coleman White (Q1331174) → 34274 McDowell Cemetery (Q72877044) → 23777
Formatter URL	https://www.hmdb.org/m.asp?m=$1
See also	Florida Historical Marker List ID (P6567), Indiana State Historical Marker Program ID (P9546), NC Highway Historical Marker Program ID (P9492), Nevada SHPO marker ID (P9515), Human Metabolome Database ID (P2057), Open Plaques plaque ID (P1893)
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/P7883 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 313 Main statement 258 out of 192,588 (0% complete) 82.4% of uses Qualifier 19 6.1% of uses Reference 36 11.5% of uses
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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/P7883#Single value, SPARQL

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

List of violations of this constraint: Database reports/Constraint violations/P7883#Unique value, hourly updated report, SPARQL (every item), SPARQL (by value)

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/P7883#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/P7883#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/P7883#Type Q721747, SPARQL

Item “instance of (P31)”: Items with this property should also have “instance of (P31)”. (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/P7883#Item P31, search, 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/P7883#Item P921, search, SPARQL

Format “[0-9]+”: 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).
List of violations of this constraint: Database reports/Constraint violations/P7883#Format, SPARQL

Adding constraints - type and main subject

I added type and main subject constraints to distinguish how and where the id is applied. The Historical Marker Database ID represents a commemorative plaque about a subject, but often is being applied to subjects directly. These constraints may affect the way Historical Marker Database 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. Also given the multiple IDs for historic markers it would allow a single Q to cross check and match against for the marker offering clearer and cleaner checks against external content.

Question regarding consideration for this property ids representing a group was mentioned on the WikiProject Cultural heritage talk page.

Seems a bad idea to me. All the examples when the property were created were actual places, and I can't see why we'd want WD to have entries for individual marker plaques in addition to them. Plaques are not statues. Vicarage (talk) 10:20, 4 March 2024 (UTC)