Property talk:P2305

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item of property constraint
qualifier to define a property constraint in combination with "property constraint" (P2302)

Represents	allowed-entity-types constraint (Q52004125)
Data type	Item
Domain	Wikidata property (Q18616576)
Example	mass (P2067) → kilogram (Q11570) video (P10) → Wikibase item (Q29934200)
See also	property constraint (P2302), property (P2306)
Lists	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/Complex constraint violations/P2305 Database reports/Constraint violations/P2305
Proposal discussion	Proposal discussion
Current uses	Total 34,039 Main statement 3 <0.1% of uses Qualifier 34,031 >99.9% of uses Reference 5 <0.1% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Scope is as qualifier (Q54828449): the property must be used by specified way only (Help)

List of violations of this constraint: Database reports/Constraint violations/P2305#Scope, hourly updated report, SPARQL

Allowed entity types are Wikibase property (Q29934218): the property may only be used on a certain entity type (Help)

List of violations of this constraint: Database reports/Constraint violations/P2305#Entity types, hourly updated report

Type “Wikidata property (Q18616576)”: item must contain property “instance of (P31)” with classes “Wikidata property (Q18616576)” or their subclasses (defined using subclass of (P279)). (Help)

List of violations of this constraint: Database reports/Constraint violations/P2305#Type Q18616576, hourly updated report, SPARQL

Item “property constraint (P2302)”: Items with this property should also have “property constraint (P2302)”. (Help)

List of violations of this constraint: Database reports/Constraint violations/P2305#Item P2302, hourly updated report, search, SPARQL

Items of an "allowed entity types constraint" must be Wikidata datatypes
The only allowed items for the item of property constraint (P2305) qualifier to the allowed-entity-types constraint (Q52004125) are Wikibase item (Q29934200), Wikibase property (Q29934218), Wikibase MediaInfo (Q59712033), Wikibase lexeme (Q51885771), Wikibase form (Q54285143) and Wikibase sense (Q54285715). (Help)
Violations query: SELECT ?item ?itemLabel ?datatype ?datatypeLabel WHERE { ?item p:P2302 [ ps:P2302 wd:Q52004125; pq:P2305 ?datatype; wikibase:rank ?rank ]. FILTER (?datatype NOT IN (wd:Q29934200, wd:Q29934218, wd:Q59712033, wd:Q51885771, wd:Q54285143, wd:Q54285715)). FILTER (?rank != wikibase:DeprecatedRank) SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". } }
List of this constraint violations: Database reports/Complex constraint violations/P2305#Items of an "allowed entity types constraint" must be Wikidata datatypes

Items of an "lexeme requires language constraint" must be human languages
The only allowed items for the item of property constraint (P2305) qualifier to the allowed-entity-types constraint (Q52004125) are instances of human language (Q20162172) or instances of a subclass of human language (Q20162172). (Help)
Violations query: SELECT ?item ?itemLabel ?language ?languageLabel WHERE { ?item p:P2302 [ ps:P2302 wd:Q55819106; pq:P2305 ?language; wikibase:rank ?rank ]. FILTER NOT EXISTS { ?language wdt:P31/wdt:P279* wd:Q20162172. } FILTER (?rank != wikibase:DeprecatedRank) SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". } }
List of this constraint violations: Database reports/Complex constraint violations/P2305#Items of an "lexeme requires language constraint" must be human languages

Items of an "allowed units constraint" must be units of measurement
The only allowed values for the item of property constraint (P2305) qualifier to allowed units constraint (Q21514353) are instances of unit of measurement (Q47574) or instances of a subclass of unit of measurement (Q47574). Use applies to part (P518), applies to people (P6001) or other similar qualifiers to distinguish counts. (Help)
Violations query: SELECT ?item ?itemLabel ?unit ?unitLabel WHERE { ?item p:P2302 [ps:P2302 wd:Q21514353; pq:P2305 ?unit ]. MINUS { ?unit wdt:P2442 []. } MINUS { ?unit wdt:P279* wd:Q8142. } MINUS { ?unit wdt:P31/wdt:P279* wd:Q47574. } SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". } }
List of this constraint violations: Database reports/Complex constraint violations/P2305#Items of an "allowed units constraint" must be units of measurement

Title	ID	Data type	Description	Examples	Inverse
property constraint	P2302	Item	property constraint: constraint applicable to a Wikidata property	IMDb ID <property constraint> distinct-values constraint	-
exception to constraint	P2303	Item	item that is an exception to the constraint, qualifier to define a property constraint in combination with P2302	IUCN conservation status <exception to constraint> Varia jamoerensis	-
group by	P2304	Property	GROUP BY: qualifier to define a property constraint in combination with P2302 (Wikidata property constraint) that is used to group constraint violations in constraint violation reports	→ Property talk:P2304	-
item of property constraint	P2305	Item	allowed-entity-types constraint: qualifier to define a property constraint in combination with "property constraint" (P2302)	mass <item of property constraint> kilogram	-
property	P2306	Property	Wikidata property: qualifier to define a property constraint in combination with P2302 (property constraint), or to limit the scope of Q44292881 (wikidata statement)	→ Property talk:P2306	-
Wikimedia Commons namespace	P2307	String	qualifier used with the Commons link property constraint (Q21510852) to specify acceptable Wikimedia Commons namespaces that a property value can link to	→ Property talk:P2307	-
class	P2308	Item	class: qualifier to define a property constraint in combination with "property constraint" (P2302)	→ Property talk:P2308	-
relation	P2309	Item	relation and relation: qualifier to define a property constraint in combination with P2302. Possibly values are: "instance of", "subclass of" or "instance or subclass of". The qualifier to use with the property "relative" is "type of kinship" (P1039), not this	→ Property talk:P2309	-
minimum date (property constraint)	P2310	Point in time	qualifier to define a property constraint in combination with "property constraint" (P2302)	→ Property talk:P2310	-
maximum date (property constraint)	P2311	Point in time	qualifier to define a property constraint in combination with "property constraint" (P2302). Use "unknown value" for current date.	→ Property talk:P2311	-
maximum value	P2312	Quantity	maximum: qualifier indicating the lowest possible value of a quantity. "no value" can be used to specify no upper bound	range constraint <maximum value> 1,234	-
minimum value	P2313	Quantity	minimum: qualifier indicating the lowest possible value of a quantity	range constraint <minimum value> 0	-
format as a regular expression	P1793	String	regular expression: regex describing an identifier or a Wikidata property. When using on property constraints, ensure syntax is a PCRE	ISO 639-3 <format as a regular expression> [a-z]{3} and IMDb ID <format as a regular expression> ev\d{7}\/\d{4}(-\d)?|(ch|co|ev|nm|tt)\d{7}	-
constraint status	P2316	Item	Wikidata constraint status: qualifier to define a property constraint in combination with P2302. Use values "mandatory constraint" or "suggestion constraint"	property scope constraint <constraint status> mandatory constraint	-
syntax clarification	P2916	Monolingual text	syntax: qualifier for P1793 (regular expression): to provide a textual description of the regex syntax of a value. Should be displayable after the text "The value for the property should match" and be followed by the regex.	Yandex Music artist ID <syntax clarification> numerisk streng, 1 til 7 tall	-

Label

I think this was first created with the label "item". This is clear in the context of constraint, but too generic outside. The current "qualifier of property constraint" isn't ideal either. Maybe we can come up with a better one.
--- Jura 07:23, 13 July 2017 (UTC)

How do you allow an property to be in a property

e.g. GitHub topic (P9100) could be set on a property --> that we have code in GITHUB related to that WD property eg. GitHub username (P2037) --> Github topic wdp2037 - Salgo60 (talk) 11:09, 31 January 2021 (UTC)