Help:Property constraints portal/Commons link

Commons link constraint (Q21510852) specifies that values for a property should be valid names of existing pages on Wikimedia Commons within a certain specified namespace.

For example, image (P18) should be a valid page in the “File” namespace, and Commons category (P373) should be a valid page in the “Category” namespace.

If no constraint scope (P4680) is specified, this constraint is checked everywhere.

Possible actions

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

• It’s possible that the page on Commons was renamed, and the statement should be updated accordingly.
• It’s possible that the page on Commons was deleted, and the statement should be removed or replaced with a different page.
• It’s possible that the item is a rare, but legitimate exception to the constraint, and nothing should be done.

Parameters

This constraint has one optional parameter:

Wikimedia Commons namespace (P2307)

Contains the expected namespace on Commons (without trailing colon, e. g. “File”). If present, must contain exactly one value (no value Help or unknown value Help is not permitted). If not present, the default namespace is used, which is only suitable for Commons gallery (P935).

Examples

Example 1

Setting for “File” namespace.

property constraint	Commons link constraint edit Wikimedia Commons namespace File constraint status mandatory constraint 0 references add reference
		add value

Example 2

Setting for “Category” namespace.

property constraint	Commons link constraint edit Wikimedia Commons namespace Category constraint status mandatory constraint 0 references add reference
		add value

Template

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.

Link to Commons namespace “File”: this property should contain a well-formed link to an existing page on Wikimedia Commons. (Help)

List of violations of this constraint: Database reports/Constraint violations/P18#Commons link, hourly updated report

Lists

Lists of properties which are set Commons link constraint.

• Category:Properties with Commons link constraints
• SPARQL query - click the execute button at the linked page to see the query result.