Distinct values: this property likely contains a value that is different from all other items. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3847#Unique value, SPARQL (every item), SPARQL (by value)

Single value: this property generally contains a single value. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3847#Single value, SPARQL

Format “[^\s/]+”: value must be formatted using this pattern (PCRE syntax). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3847#Format, SPARQL

Format “((person|place|time):)?[^:\n]+”: value must be formatted using this pattern (PCRE syntax). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). Known exceptions: Mount Vernon (Q731635)
List of violations of this constraint: Database reports/Constraint violations/P3847#Format, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3847#Entity types

Scope is as main value (Q54828448), as reference (Q54828450): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3847#Scope, SPARQL

This property is being used by: it:Template:Collegamenti esterni Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)

Open Library permits colons (:) in subject headings, even if the colon does not indicate a whitelisted prefix (like person, place, and time).

Some headings have pseudo-prefixes: series:asterix

Other headings use a colon within the subject heading itself: 15.50 general world history; history of great parts of the world peoples civilizations: general

Perhaps the regex of this property should allow for such usage. Ringbang (talk) 01:27, 25 February 2023 (UTC)[reply]