Property talk:P4221

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National Criminal Justice ID
identifier for a publication, report, article or audiovisual product, in the United States' National Criminal Justice Reference Service database

Description	identifier for a publication, report, article or audiovisual product, in the United States' National Criminal Justice Reference Service database
Associated item	National Criminal Justice Reference Service (Q6972009)
Data type	External identifier
Template parameter	en:Template:NCJ
Domain	According to this template: publication, report, article, or audiovisual product According to statements in the property: work (Q386724) When possible, data should only be stored as statements
Allowed values	\d{1,6}
Example	Measures of Gun Ownership Levels for Macro-Level Crime and Violence Research (Q28798208) → 203876 Social Perceptions of Third-Party Consent and the Reasonableness Test of Illinois v. Rodriguez (Q29306274) → 137413 Beyond Hellfire: An Exploration of the Variable Effects of Religiosity on Adolescent Marijuana and Alcohol Use (Q30052522) → 119287
Formatter URL	https://www.ncjrs.gov/App/Publications/abstract.aspx?ID=$1
Robot and gadget jobs	Yes
Related to country	United States of America (Q30) (See 762 others)
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) Database reports/Constraint violations/P4221 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 19 Main statement 16 84.2% of uses Qualifier 3 15.8% of uses
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Format “\d{1,6}”: 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/P4221#Format, SPARQL

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/P4221#Single value, 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/P4221#Unique value, SPARQL (every item), SPARQL (by value)

Type “work (Q386724)”: item must contain property “instance of (P31)” with classes “work (Q386724)” or their subclasses (defined using subclass of (P279)). (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/P4221#Type Q386724, 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/P4221#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/P4221#Scope, SPARQL