Property talk:P397

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DOI
serial code used to uniquely identify digital objects like academic papers (use upper case letters only)

Data type	External identifier
Allowed values	10\.\d{4,9}/.+ (Syntax described at http://www.doi.org/doi_handbook/2_Numbering.html#2.2 does not specify case. Uppercase recommended.) (?i)10.\d{4,9}/[-._;()/:A-Z0-9]+ (The regular expression syntax described for "modern Crossref DOIs" by Andrew Gilmartin, a member of the U.S. Crossref team. Matches 74.4 million of the 74.9 million DOIs in Crossref.) (?i)10.\d{4,9}/[^\s]+ (Syntax described by Andrew Gilmartin (member of the U.S. Crossref team) for early DOIs (catches approximately 300,000 more DOIs than the "modern Crossref DOI" regular expression). Escape character added to avoid malformed input error.)
Formatter URL	https://doi.org/$1 info:doi/$1
Lists	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)> Map Random list
Proposal discussion	Originally created without a formal discussion
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Format “(10\.[0-9]{4,}(?:\.[0-9]+)*/(?:(?!["&'])\S)+)|”: value must be formatted using this pattern (PCRE syntax). Exceptions are possible as rare values may exist. List of this constraint violations: Database reports/Constraint violations/P397#Format, SPARQL

Single value: this property generally contains a single value. Exceptions are possible as rare values may exist. List of this constraint violations: Database reports/Constraint violations/P397#Single value, SPARQL

Distinct values: this property likely contains a value that is different from all other items. Exceptions are possible as rare values may exist. List of this constraint violations: Database reports/Constraint violations/P397#Unique value, SPARQL (every item), SPARQL (by value)

Qualifiers “reason for deprecated rank (P344), issued by (P214), reason for preferred rank (P345)”: this property should be used only with the listed qualifiers. Exceptions are possible as rare values may exist. List of this constraint violations: Database reports/Constraint violations/P397#Allowed qualifiers, SPARQL

Conflicts with “occupation (P6)”: this property must not be used with the listed properties and values. Exceptions are possible as rare values may exist. List of this constraint violations: Database reports/Constraint violations/P397#Conflicts with, search, SPARQL

Conflicts with “subclass of (P12)”: this property must not be used with the listed properties and values. Exceptions are possible as rare values may exist. List of this constraint violations: Database reports/Constraint violations/P397#Conflicts with, search, SPARQL

Format “(?i)((?!\b(%)).)*”: value must be formatted using this pattern (PCRE syntax). Exceptions are possible as rare values may exist. List of this constraint violations: Database reports/Constraint violations/P397#Format, SPARQL

Format “(?i)((?!\b(&)).)*”: value must be formatted using this pattern (PCRE syntax). Exceptions are possible as rare values may exist. List of this constraint violations: Database reports/Constraint violations/P397#Format, SPARQL

Format “[^a-z]*”: value must be formatted using this pattern (PCRE syntax). Exceptions are possible as rare values may exist. List of this constraint violations: Database reports/Constraint violations/P397#Format, SPARQL

Allowed entity types are Wikibase item datatype (Q799): the property may only be used on a certain entity type Exceptions are possible as rare values may exist. List of this constraint violations: Database reports/Constraint violations/P397#allowed entity types

Scope is as main value (Q793), as qualifier (Q792), as reference (Q780): the property must be used by specified way only Exceptions are possible as rare values may exist. List of this constraint violations: Database reports/Constraint violations/P397#scope, SPARQL