Property talk:P6902

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era name
era name for rulers in East Asia

Represents	era name (Q256408)
Data type	Item
Template parameter	"era name" in en:Template:Infobox royalty, "年号" in zh:Template:Eranamebox, "年號" in zh:Template:清朝皇帝信息框, "元号" in ja:Template:基礎情報 天皇, "연호" in ko:틀:왕족 정보, etc.
Domain	human (Q5)
Example	Emperor Gaozong of Song (Q7489) → Jianyan (Q11065468) Emperor Gaozong of Song (Q7489) → Shaoxing (Q11606213) Akihito (Q37979) → Heisei era (Q234510) Taejo of Goryeo (Q334312) → Cheonsu (Q10939679)
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 Map of people by place values: place of birth educated at work location residence place of death place of burial January 1st dates People with date of birth on January 1 People with date of death on January 1 People with both dates on January 1 Database reports/Complex constraint violations/P6902 Database reports/Constraint violations/P6902 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 358 Main statement 354 98.9% of uses Qualifier 4 1.1% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Type “human (Q5)”: item must contain property “instance of (P31)” with classes “human (Q5)” 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/P6902#Type Q5, SPARQL

Property “start time (P580)” declared by target items of “era name (P6902)”: If [item A] has this property with value [item B], [item B] is required to have property “start time (P580)”. (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/P6902#Target required claim P580, SPARQL, SPARQL (by value)

Property “end time (P582)” declared by target items of “era name (P6902)”: If [item A] has this property with value [item B], [item B] is required to have property “end time (P582)”. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). Known exceptions: Naruhito (Q217096)
List of violations of this constraint: Database reports/Constraint violations/P6902#Target required claim P582, SPARQL, SPARQL (by value)

Item “position held (P39): crown prince (Q207293), Emperor of China (Q268218), khan (Q181888), khagan (Q187878), Khan of Heaven (Q5361581), Taishang Huang (Q44731715), emperor (Q39018), Emperor of Japan (Q208233), king of Joseon Dynasty (Q22304810), monarch (Q116), emperor of Manchukuo (Q5361370), emperor Mañjuśrī (Q11080008), Daijō Tennō (Q14303973), queen regnant (Q19643), Emperor of Korea (Q23665193)”: Items with this property should also have “position held (P39): crown prince (Q207293), Emperor of China (Q268218), khan (Q181888), khagan (Q187878), Khan of Heaven (Q5361581), Taishang Huang (Q44731715), emperor (Q39018), Emperor of Japan (Q208233), king of Joseon Dynasty (Q22304810), monarch (Q116), emperor of Manchukuo (Q5361370), emperor Mañjuśrī (Q11080008), Daijō Tennō (Q14303973), queen regnant (Q19643), Emperor of Korea (Q23665193)”. (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/P6902#Item P39

Property “follows (P155)” declared by target items of “era name (P6902)”: If [item A] has this property with value [item B], [item B] is required to have property “follows (P155)”. (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/P6902#Target required claim P155, SPARQL, SPARQL (by value)

Property “followed by (P156)” declared by target items of “era name (P6902)”: If [item A] has this property with value [item B], [item B] is required to have property “followed by (P156)”. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). Known exceptions: Naruhito (Q217096)
List of violations of this constraint: Database reports/Constraint violations/P6902#Target required claim P156, SPARQL, SPARQL (by value)

Value type “era name (Q256408)”: 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 era name (Q256408) (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/P6902#Value type Q256408, 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). Known exceptions: Emperor Ling of Han (Q7299), Emperor Xian of Han (Q7316)
List of violations of this constraint: Database reports/Constraint violations/P6902#Unique value, 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/P6902#Entity types

Scope is as main value (Q54828448): 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/P6902#Scope, SPARQL

instances of era names could be linked with this property
(Help)
Violations query: SELECT ?item WHERE { ?item wdt:P31/wdt:P279* wd:Q256408 . MINUS { [ ] wdt:P6902 ?item } } LIMIT 500
List of this constraint violations: Database reports/Complex constraint violations/P6902#instances of era names could be linked with this property

items for Emperors of Japan would have this property
(Help)
Violations query: SELECT ?item ?d { ?item wdt:P39 wd:Q208233 . MINUS { ?item wdt:P6902 [] } OPTIONAL { ?item wdt:P570 ?d } } ORDER BY DESC(?d) LIMIT 50
List of this constraint violations: Database reports/Complex constraint violations/P6902#items for Emperors of Japan would have this property

values for items for Emperors of Japan should be instances of Japanese era names
(Help)
Violations query: SELECT ?item ?era { ?item wdt:P39 wd:Q208233 . ?item wdt:P6902 ?era . MINUS { ?era wdt:P31 wd:Q24706 } } LIMIT 50
List of this constraint violations: Database reports/Complex constraint violations/P6902#values for items for Emperors of Japan should be instances of Japanese era names

items for Emperors of China would have this property
(Help)
Violations query: SELECT ?item { ?item wdt:P39 wd:Q268218 . MINUS { ?item wdt:P6902 [] } }
List of this constraint violations: Database reports/Complex constraint violations/P6902#items for Emperors of China would have this property

Problem with label of Q256408 (currently "era name")

Please see Talk:Q256408 --- Jura 16:55, 3 July 2019 (UTC)