Property talk:P7782

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category for ship name
Commons category for a name of a ship

Represents	ship name (Q56351075), Commons category (Q24574745)
Data type	Item
Domain	According to this template: item According to statements in the property: watercraft (Q1229765) When possible, data should only be stored as statements
Usage notes	Use this property to link to Wikidata items that are specific about ship names, primarily those that have a Commons category for the ship name. The IMO category on Commons goes with the main item, then the subcategories for ship names go with items linked to through this property. It is bot-maintained (via Pi bot), manual changes to sitelinks may cause confusion.
Example	Queen (Q63676401) → Category:Mississippi Queen (ship, 1987) (Q63648354) RMS Queen Elizabeth (Q533218) → Category:Queen Elizabeth (ship, 1940) (Q81142744) Category:Seawise University (ship, 1940) (Q81142824)
See also	category for the interior of the item (P7561), topic's main category (P910)
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 By value of property Most statements Fewest statements Most sitelinks Most linked wikis Most identifiers 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/P7782 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 35,485 Main statement 35,481 >99.9% of uses Qualifier 4 <0.1% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Value type “Wikimedia category (Q4167836)”: 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 Wikimedia category (Q4167836) (or a subclass thereof). (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/P7782#Value type Q4167836, 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/P7782#Unique value, SPARQL (every item), SPARQL (by value)

Inverse property of “category combines topics (P971)”:
if [item A] has this property (category for ship name (P7782)) linked to [item B],
then [item B] should also have property “category combines topics (P971)” linked to [item A]. (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/P7782#inverse, SPARQL

Property “instance of (P31): Wikimedia category (Q4167836)” declared by target items of “category for ship name (P7782)”: If [item A] has this property with value [item B], [item B] is required to have property “instance of (P31): Wikimedia category (Q4167836)”. (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/P7782#Target required claim P31, SPARQL

Property “category combines topics (P971): ship name (Q56351075)” declared by target items of “category for ship name (P7782)”: If [item A] has this property with value [item B], [item B] is required to have property “category combines topics (P971): ship name (Q56351075)”. (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/P7782#Target required claim P971, SPARQL

Type “watercraft (Q1229765)”: item must contain property “instance of (P31)” with classes “watercraft (Q1229765)” 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/P7782#Type Q1229765, SPARQL

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/P7782#Entity types