Help:Property constraints portal/Type

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type constraint (Q21503250) specifies that items with a given property should have a given type. This is also known as the domain of a property.

For example, items with date of birth (P569) should be instance of (P31) human (Q5) or animal (Q729), and items with sRGB color hex triplet (P465) should be subclass of (P279) color (Q1075).

Subclass relations according to subclass of (P279) are taken into account: if a constraint demands that an item should be an instance of building (Q41176), it is not a violation if the item is an instance of skyscraper (Q11303), because there is a subclass of (P279) path from skyscraper (Q11303) to building (Q41176). (If an indirect relation should not be permitted, item requires statement constraint (Q21503247) can be used.)

If no constraint scope (P4680) is specified, this constraint is only checked on the main value of a statement.

Possible actions[edit]

There are several possible ways to address a violation of this constraint:


This constraint has two parameters (both mandatory):

relation (P2309)
Must be instance of (Q21503252), subclass of (Q21514624), or instance or subclass of (Q30208840). Describes whether the item should be an instance of the class(es), or a subclass of it/them, or whether both are allowed. This parameter must only be given once.
class (P2308)
Lists the classes that the item should have. Each class must be an item ID (no value Help or unknown value Help is not permitted).


Example 1[edit]

Item which has place of birth (P19) data should be instance of human, fictional character or animal.

property constraint
Normal rank type constraint Arbcom ru editing.svg edit
class human
fictional character
relation instance of
▼ 0 reference
+ add reference
+ add value

Example 2[edit]

Item which has drug used for treatment (P2176) data should be subclass of disease.

property constraint
Normal rank type constraint Arbcom ru editing.svg edit
class disease
relation subclass of
▼ 0 reference
+ add reference
+ add value


When the constraint is set to the property, the following template is automatically displayed in the property talk page. The template is created by Module:Constraints using Template:Constraint, invoked from Template:Property documentation. Translations are defined at Module:i18n/constraints.

Type “human (Q5), fictional character (Q95074), person (Q215627): element must contain property “instance of (P31)” with classes “human (Q5), fictional character (Q95074), person (Q215627)” or their subclasses (defined using subclass of (P279)). (Help)
List of this constraint violations: Database reports/Constraint violations/P512#Type Q5, Q95074, Q215627, hourly updated report, SPARQL, SPARQL (new)


Lists of properties which are set type constraint.