Property talk:P8484

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PM20 subject code
code for a subject category in the 20th Century Press Archives' subject category system

Represents	PM20 subject category (Q92707903)
Associated item	20th Century Press Archives (Q36948990)
Data type	External identifier
Allowed values	[a-z]\d*[a-c]?(_Sm\d+(\.[IVX]+([a-z])?)?)?(_\((alt|[A-J]\d*)\))*
Example	economy (Q159810) → n navy (Q4508) → l2 higher education (Q136822) → k1
Source	https://pm20.zbw.eu
Formatter URL	https://pm20.zbw.eu/category/subject/s/$1 http://purl.org/pm20/category/subject/s/$1
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/P8484 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 13,528 Main statement 1,452 10.7% of uses Qualifier 12,076 89.3% of uses
Search for values

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

Format “[a-z]\d*[a-c]?(_Sm\d+(\.[IVX]+([a-z])?)?)?(_\((alt|[A-J]\d*)\))*”: 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/P8484#Format, SPARQL

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/P8484#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/P8484#Single value, 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/P8484#Entity types

Scope is as main value (Q54828448), as qualifier (Q54828449): 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/P8484#Scope, SPARQL

purl.org formatter URL temporarily deprecated because of bug for certain URLs

Currently, brackets (as in "n_Sm9_(alt)") are not resolved by the purl.org redirect service. --Jneubert (talk) 08:34, 2 January 2021 (UTC)