Property talk:P3847

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Open Library subject ID
identifier for a topic in the Open Library database

Associated item	Open Library (Q1201876)
Applicable "stated in" value	Open Library (Q1201876)
Data type	External identifier
Allowed values	((person|place|time):)?[^:\n]+
Example	Halley's Comet (Q23054) → halley's_comet Borneo (Q36117) → place:borneo Joan Miró (Q152384) → person:joan_miro_(1893-1983) French Third Republic (Q70802) → time:third_republic_1870-1940
Source	https://openlibrary.org/subjects
Formatter URL	https://openlibrary.org/subjects/$1
Tracking: usage	Category:Pages using Wikidata property P3847 (Q63707715)
See also	Open Library ID (P648), TED topic ID (P2612), Quora topic ID (P3417), JSTOR topic ID (P3827), Open Library publisher ID (P12088)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other external identifier Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Database reports/Constraint violations/P3847 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 6,420 Main statement 6,410 99.8% of uses Qualifier 4 <0.1% of uses Reference 6 <0.1% of uses
Search for values

[create Create a translatable help page (preferably in English) for this property to be included here]

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.)

Colon in subject headings

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)