Property talk:P12809

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vehicle keeper marking (VKM)
code identifying owners of rolling stock in Europe

Associated item	European Union Agency for Railways (Q369273), Intergovernmental Organisation for International Carriage by Rail (Q2333216)
Applicable "stated in" value	Vehicle Keeper Marking register (Q131410948)
Data type	External identifier
Domain	vehicle holder (Q1305580)
Allowed values	[A-ZÄÖÜa-zäöüА-Яа-я]{2,5}
Example	Deutsche Bahn (Q9322) → DB Network Rail (Q1501071) → NRIL GEFCO (Q3093177) → GEFCO
Source	https://www.era.europa.eu/domains/registers/vkm_en
Formatter URL	https://vehicle-keeper-markings.toolforge.org/$1
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 Items with deprecated claims Deprecated statements with this identifier as a source Usage history (total) Usage history (main statement) Chart by item creation date Mix'n'match (Report) Database reports/Constraint violations/P12809 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 1,000 Main statement 952 95.2% of uses Qualifier 3 0.3% of uses Reference 45 4.5% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Type “vehicle holder (Q1305580)”: item must contain property “instance of (P31)” with classes “vehicle holder (Q1305580)” or their subclasses (defined using subclass of (P279)). (Help)

List of violations of this constraint: Database reports/Constraint violations/P12809#Type Q1305580, hourly updated report, SPARQL

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/P12809#Scope, SPARQL

Format “\p{L}{2,5}”: 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/P12809#Format, SPARQL

Single best value: this property generally contains a single value. If there are several, one would have preferred rank (Help)

List of violations of this constraint: Database reports/Constraint violations/P12809#single best value, hourly updated report, 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/P12809#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/P12809#Entity types

Formatter URL

I’ve written a web app to serve the content of the EU/IFOPT VKM Registry over HTTP, and changed formatter URL (P1630) accordingly. —Sascha (talk) 23:40, 6 January 2025 (UTC)

Regular expression

I’ve changed the regular expression to include Latin and Cyrillic uppercase and lowercase letters. For example, the VKM register contains identifiers such as УЗ, RhB or login. — Sascha (talk) 09:41, 14 January 2025 (UTC)