Property talk:P8882

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complementary property
property expressing opposing information (e.g. start date and end date). For inverses, use P1696. For properties that negate each other, use P11317. For relations among items, use P461.

Data type	Property
Domain	Wikidata property (Q18616576) or Wikidata qualifier (Q15720608)
Example	start time (P580) → end time (P582) service entry (P729) → service retirement (P730) service retirement (P730) → service entry (P729) compulsory education (minimum age) (P3270) → compulsory education (maximum age) (P3271) subject has role (P2868) → object has role (P3831) literate population (P6499) → illiterate population (P6498)
Source	https://www.wikidata.org/wiki/Help:Dates#Property_pairs_for_time_periods
See also	inverse property (P1696), negates property (P11317), opposite of (P461), related property (P1659)
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 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/Complex constraint violations/P8882 Database reports/Constraint violations/P8882 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 157 Main statement 151 96.2% of uses Qualifier 6 3.8% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Value type “Wikidata property (Q18616576), Wikidata qualifier (Q15720608)”: 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 Wikidata property (Q18616576), Wikidata qualifier (Q15720608) (or a subclass thereof). (Help)

List of violations of this constraint: Database reports/Constraint violations/P8882#Value type Q18616576, Q15720608, hourly updated report, SPARQL

Property “complementary property (P8882)” declared by target items of “complementary property (P8882)”: If [item A] has this property with value [item B], [item B] is required to have property “complementary property (P8882)”. (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/P8882#Target required claim P8882, SPARQL, SPARQL (by value)

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/P8882#Scope, SPARQL

Allowed entity types are Wikibase property (Q29934218): 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/P8882#Entity types

Type “Wikidata property (Q18616576), Wikidata qualifier (Q15720608)”: item must contain property “instance of (P31)” with classes “Wikidata property (Q18616576), Wikidata qualifier (Q15720608)” or their subclasses (defined using subclass of (P279)). (Help)

List of violations of this constraint: Database reports/Constraint violations/P8882#Type Q18616576, Q15720608, hourly updated report, SPARQL

Value shouldn't be the same as for "inverse property" (P1696)
TODO: correct one of the two statements (Help)
Violations query: SELECT ?item ?value { ?item wdt:P8882 ?value ; wdt:P1696 ?value }
List of this constraint violations: Database reports/Complex constraint violations/P8882#Value shouldn't be the same as for "inverse property" (P1696)

Value shouldn't be the same as for "see also" (P1659)
TODO: correct one of the two statements (Help)
Violations query: SELECT ?item ?value { ?item wdt:P8882 ?value ; wdt:P1659 ?value }
List of this constraint violations: Database reports/Complex constraint violations/P8882#Value shouldn't be the same as for "see also" (P1659)