Template:Constraint

{{{name}}}: {{{description}}}

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint:

Template documentation

This template is the base for the following sub-templates (which work by invoking Module:Constraints):

• Template:Constraint:Commons link
• Template:Constraint:Conflicts with
• Template:Constraint:Contemporary
• Template:Constraint:Diff within range
• Template:Constraint:Format
• Template:Constraint:Inverse
• Template:Constraint:Item
• Template:Constraint:Multi value
• Template:Constraint:One of
• Template:Constraint:Qualifiers
• Template:Constraint:Range
• Template:Constraint:Single value
• Template:Constraint:Symmetric
• Template:Constraint:Target required claim
• Template:Constraint:Type
• Template:Constraint:Unique value
• Template:Constraint:Units
• Template:Constraint:Value type

This template and the above subtemplates categorize into Category:Properties with constraints and its subcategories.

This group of templates helps to detect items where a property has been assigned an invalid value. To take advantage of this opportunity put the templates on the discussion page of the respective property. After a while a bot will generate a list of violations.

Some constraints are type-specific. The table below can help to choose the right constraints for a given property.

type	specific constraints	common for all types
Item	Contemporary Inverse One of Symmetric Target required claim Value type	Item Type Single value Multi value Conflicts with Qualifiers
Commons media file	Commons link Unique value Format
String	Format Unique value Commons link
Point in time	Range Diff within range Unique value
Geographic coordinates	Unique value
URL	Format Unique value
Quantity	Units Range Diff within range One of
Property	One of Symmetric Inverse Target required claim Value type
External identifier	Format Unique value
Tabular data	Commons link Unique value Format
Geographic shape	Commons link Unique value Format

Parameters

Common parameters:

• mandatory — see Wikidata:Database reports/Constraint violations/Mandatory constraints
• exceptions — allows to exclude some items from processing, format should be [[Q####]], {{Q|####}}, or Q####, but not {{Q|Q####}}, example: Property talk:P227
• group property — allows to group results by specified property, sample: P1082#Qualifiers

Samples

• {{Constraint:Unique value|exceptions= {{Q|13261}}, {{Q|208008}} |mandatory=true}}
• {{Constraint:Unique value|group property=P17}}

Update frequency

Lists are updated by KrBot once a day. Incremental dumps are used (status of today's dump).

Reports

• Summary
• All properties

Template translations

Module:i18n/constraints