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).

Possible actions[edit]

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


This constraint has two parameters (both mandatory):

relation (P2309)
Either instance of (Q21503252) or subclass of (Q21514624). Describes whether the item should be an instance or a subclass of the class. 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).