Help:Property constraints portal/Target required claim
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value-requires-statement constraint (Q21510864) specifies that values for this property should have a certain other statement. The equivalent constraint for the item that contains the statement is item requires claim.
For example, values of screenwriter (P58) statement should also have a statement for sex or gender (P21) as well as the statement occupation (P106)screenwriter (Q28389).
If no constraint scope (P4680) is specified, this constraint is checked everywhere.
There are several possible ways to address a violation of this constraint:
- The most likely case is that the missing statements should be added to the value item.
- It’s possible that the current item should not have the statement at all, and that the statement should be removed.
- It’s possible that the wrong value item was chosen, e.g. The Beatles (Q3295515) instead of The Beatles (Q1299), and that the statement should be updated.
- It’s possible that the item is a rare, but legitimate exception to the constraint, and nothing should be done.
This constraint has one mandatory and one optional parameter:
- property (P2306)
- Contains the property of the missing statement. Must contain exactly one property (no value Help or unknown value Help is not permitted). To add multiple required statements, add multiple constraints of this type.
- item of property constraint (P2305)
- Optional; contains the allowed values. no value Help and unknown value Help are interpreted literally, like any normal value (statements with no value Help or unknown value Help are only allowed if these special values are also given in the allowed values).
- If this parameter is missing, the constraint only requires that a statement with the given property exists, but places no restriction on the value of that statement.
Example setting for film editor (P1040).
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.
Lists of properties which are set value requires statement constraint.
- Category:Properties with target required claim constraints
- SPARQL query - click the execute button at the linked page to see the query result.