Property talk:P821

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CGNDB Unique ID
identifier(s) for a geographical feature contained in the Canadian Geographical Names Data Base (CGNDB)
DescriptionIdentifier the geographical feature of the Geographical Names Board of Canada / Commission de toponymie du Canada.
RepresentsCanadian Geographical Names Data Base (Q14934367)
Applicable "stated in" valueCanadian Geographical Names Data Base (Q14934367)
Data typeExternal identifier
Template parameteren:Template:Cite cgndb - Template:Cite cgndb (Q6927131)
Domainplace (note: this should be moved to the property statements)
Allowed values[A-O][A-Z]{4} (5 uppercase letters)
ExampleRed River of the North (Q156006)GAWTC
GBFMO
Québec City Jean Lesage International Airport (Q794549)EPWHM
SourceQuery by Geographical Name
Recherche de toponymes
Formatter URLhttp://www4.rncan.gc.ca/search-place-names/unique/$1
http://www4.rncan.gc.ca/search-place-names/unique.php?id=$1
Tracking: usageCategory:Pages using Wikidata property P821 (Q27485862)
Related to country  Canada (Q16) (See 114 others)
See alsoBC Geographical Names ID (P2099), Banque de noms de lieux du Québec ID (P2100)
Lists
Proposal discussionProposal discussion
Current uses
Total4,479
Main statement3,36375.1% of uses
Qualifier3<0.1% of uses
Reference1,11324.8% 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)
List of this constraint violations: Database reports/Constraint violations/P821#Unique value, hourly updated report, SPARQL (every item), SPARQL (by value), SPARQL (new)
 
Format “[A-O][A-Z]{4}: value must be formatted using this pattern (PCRE syntax). (Help)
List of this constraint violations: Database reports/Constraint violations/P821#Format, hourly updated report, SPARQL, SPARQL (new)
 
Item “country (P17): Canada (Q16): Items with this property should also have “country (P17): Canada (Q16)”. (Help)
List of this constraint violations: Database reports/Constraint violations/P821#Item P17, hourly updated report, search, SPARQL, SPARQL (new)
 
Item “coordinate location (P625): Items with this property should also have “coordinate location (P625)”. (Help)
Exceptions are possible as rare values may exist.
List of this constraint violations: Database reports/Constraint violations/P821#Item P625, SPARQL, SPARQL (new)
 
Qualifiers “language of work or name (P407), applies to part (P518), reason for deprecation (P2241), reason for preferred rank (P7452): this property should be used only with the listed qualifiers. (Help)
Exceptions are possible as rare values may exist.
List of this constraint violations: Database reports/Constraint violations/P821#Allowed qualifiers, SPARQL, SPARQL (new)
 
Single value: this property generally contains a single value. (Help)
Exceptions are possible as rare values may exist.
List of this constraint violations: Database reports/Constraint violations/P821#Single value, SPARQL, SPARQL (new)
 
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.
List of this constraint violations: Database reports/Constraint violations/P821#allowed entity types, SPARQL (new)
 
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.
List of this constraint violations: Database reports/Constraint violations/P821#scope, SPARQL, SPARQL (new)


No single valueEdit

Hello. I have withdrawn the single value constraint, as the database is full of entries in both French and English, each language getting a different identifier. Thierry Caro (talk) 04:20, 8 November 2016 (UTC)

@Thierry Caro: There is also one entry by province. Actually the Gulf of Saint Lawrence (Q169523) is the most exteme case whit 10 different ID. --Fralambert (talk) 04:42, 8 November 2016 (UTC)

Toponymic Feature IDEdit

I see that it was briefly mentioned when the property was created, but there also exists a "Toponymic Feature ID" which works fine using the same formatter URL and is actually unique for each item unlike the "Key" currently used. Not sure why this was not discussed further before creation because it makes sense to me to either use that or allow it as another value for this property (alter the regex). --SilentSpike (talk) 16:13, 8 August 2019 (UTC)

An example for the existing property example: http://www4.rncan.gc.ca/search-place-names/unique/703f61a8ba3311d892e2080020a0f4c9 --SilentSpike (talk) 16:14, 8 August 2019 (UTC)
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