Property talk:P8047

Documentation

country of registry
country where a ship is or has been registered

Represents

flag state (Q3591841)

Data type

Item

Domain

watercraft (Q1229765) or shipwreck (Q852190)

Example

Coral Mermaid (Q83637311) → Panama (Q804)
MS Scandinavian Star (Q1528996) → France (Q142)
Norwegian Gannet (Q59220446) → Norway (Q20)

See also

port of registry (P532)

Lists

Proposal discussion

Current uses

Total	105,789
Main statement	105,725	>99.9% of uses
Qualifier	64	<0.1% of uses

Search for values

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

Type “watercraft (Q1229765), shipwreck (Q852190)”: item must contain property “instance of (P31)” with classes “watercraft (Q1229765), shipwreck (Q852190)” or their subclasses (defined using subclass of (P279)). (Help)

List of violations of this constraint: Database reports/Constraint violations/P8047#Type Q1229765, Q852190, hourly updated report, SPARQL

Value type “administrative territorial entity (Q56061)”: This property should use items as value that contain property “instance of (P31)”. On these, the value for instance of (P31) should be an item that uses subclass of (P279) with value administrative territorial entity (Q56061) (or a subclass thereof). (Help)

List of violations of this constraint: Database reports/Constraint violations/P8047#Value type Q56061, hourly updated report, SPARQL

Qualifiers “start time (P580), end time (P582), sourcing circumstances (P1480), reason for deprecated rank (P2241), reason for preferred rank (P7452), earliest date (P1319), earliest end date (P8554), latest start date (P8555), latest date (P1326)”: this property should be used only with the listed qualifiers. (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/P8047#allowed qualifiers, SPARQL

None of Vatican City (Q237): value must not be any of the specified items.
Replacement property:
Replacement values: (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/P8047#none of, SPARQL

Conflicts with “applies to jurisdiction (P1001)”: this property must not be used with the listed properties and values. (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/P8047#Conflicts with P1001, search, SPARQL

Scope is as main value (Q54828448), as qualifier (Q54828449): 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/P8047#Scope, 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/P8047#Entity types

Single best value: this property generally contains a single value. If there are several, one would have preferred rank (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/P8047#single best value, SPARQL

Contemporaries:
if [item A] has this property (country of registry (P8047)) linked to [item B],
then [item A] and [item B] have to coincide or coexist at some point of history. (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/P8047#Contemporary, SPARQL

Warships are generally not registered
Warships in active naval use are generally not registered by the states controlling the warships. It is possible that former warships are converted to merchant/civilian use, in which case registration would become necessary. It is also possible that registration is required during construction of a warship whilst a civilian shipbuilder is performing sea trials and before commissioning of the warship into a navy. The constraint SPARQL query is currently not complex enough to factor in these less common scenarios and a small number of false positives therefore may be returned for this constraint. (Help)
Violations query: SELECT DISTINCT ?item WHERE { ?item wdt:P31/wdt:P279* wd:Q3114762; wdt:P8047 ?registration_country. }
List of this constraint violations: Database reports/Complex constraint violations/P8047#Warships are generally not registered

First ship registrations were only possible in Britain circa 1660
Due to Britain passing ship registration laws in 1660 (see Navigation Acts (Q318785) and [1] and [2]) it is not possible for ships destroyed or disused by 1660 to have ever been registered. (Help)
Violations query:

SELECT ?item WHERE {   VALUES ?events_indicating_end_of_existence {     wd:Q1522772     wd:Q906512     wd:Q7497952     wd:Q12772819     wd:Q30880545     wd:Q2478058     wd:Q1786766     wd:Q2344557     wd:Q17781833     wd:Q49642078     wd:Q331483     wd:Q336332     wd:Q7497950     wd:Q38131096     wd:Q17113173     wd:Q3030513   }   ?item wdt:P31/wdt:P279* wd:Q11446;         wdt:P8047 ?registration_country;         p:P793 ?event.   ?event ps:P793 ?events_indicating_end_of_existence.   ?event pq:P585 ?point_in_time FILTER (?point_in_time < "1660-01-01"^^xsd:dateTime). }

List of this constraint violations: Database reports/Complex constraint violations/P8047#First ship registrations were only possible in Britain circa 1660

This property is being used by:

Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)

Relevance[edit]

The notion of "country of registry" is applicable only to modern commercial ships. Nevertheless, it keeps appearing on Q-Item where it is not relevant, such as

warships
private yachts
ships of the 19th century or earlier

Can we add constraints to prevent this from happening? Thank you. Rama (talk) 09:38, 6 August 2021 (UTC)[reply]

I agree for warships, but https://www.ukshipregister.co.uk/ for example accepts registration for leisure craft and larger yachts. I think for the period a ship is operated by a national navy it should not have registration, but for a commandeered merchantman/liner, its non-military service it should. And it makes no sense for pre 20th century ships. Vicarage (talk) 08:30, 11 July 2022 (UTC)[reply]

I've added a complex constraint to this page for returning a constraint error if this property is used on items which are warships. It could do with some complex improvement to the query to work with more complex cases of (for example) a merchant ship being registered, then later being converted to a warship and unregistered, then later converted back to a merchant ship and re-registered. --Dhx1 (talk) 17:34, 19 July 2022 (UTC)[reply]

Added another complex query to exclude ships disposed of prior to 1660 when ship registrations were first introduced as a possibility in Britain. --Dhx1 (talk) 18:38, 19 July 2022 (UTC)[reply]

Aircraft?[edit]

Is there any reason this property can not be used for aircraft? /ℇsquilo 19:17, 4 May 2022 (UTC)[reply]

use with country[edit]

There is currently a restriction that country of registry (P8047) cannot occur with country (P17). But a ship can have a country of origin (P495) where it was built, a history of country of registry (P8047) entries during its active career, and have a country (P17) in its retirement as a museum ship (Q575727) or even a coastal shipwreck (Q852190). The last is useful to tie it into the museum structure, and ensure it has coordinates, location etc. I think the restriction should be lifted. Vicarage (talk) 23:21, 8 November 2022 (UTC)[reply]

@Vicarage: That makes sense. Museum ships ought to be listed as a permanent exception to this constraint, the same way shipwrecks are. Will be changing it. Infrastruktur (talk) 09:55, 22 January 2023 (UTC)[reply]

Hmm. It doesn't look like using "exception to constraint" is valid for use with anything other than specific instances. Unless there is a better solution; Depending on the number of items this affects I'm thinking this should be made into a suggestion constraint, or alternatively remove the warning message. What do you prefer? Infrastruktur (talk) 10:23, 22 January 2023 (UTC)[reply]

Thanks for addressing this. I'd prefer the warning to be removed entirely than have a nest of exceptions. Vicarage (talk) 12:39, 22 January 2023 (UTC)[reply]

For example Andrea (Q10573107) has been registered in 3 countries. Since we have one object for each IMO ship number (P458) there should not be a varning single-best-value constraint (Q52060874), should it? Maundwiki (talk) 15:03, 19 September 2023 (UTC)[reply]

I agree with you Vicarage (talk) 15:08, 19 September 2023 (UTC)[reply]

museum ships[edit]

The number of museum ships with/without country (P17) is about the same as those with/without country of registry (P8047), 250-450 across the 4 categories. If we assume its best if all those ships had both properties (see above for releasing restriction), and as we have so few ships with more than one registration, it would be simplest to copy from one to the other. If you only wanted one, I'd go for country, as I find the idea of asserting a registration without an actual registration number is silly, and if you wanted to quote a number, then that would be best as a qualifier to a registration service property anyway, like the Historic Ships in the UK Vicarage (talk) 23:32, 8 November 2022 (UTC)[reply]