Property talk:P4742

Documentation

• Start a query
• Current uses
• Statistics by class
• String length
• List of qualifiers
• Count

Uniform Resource Identifier Scheme
IANA-assigned uniform resource identifier scheme which identifies items within this class or set

Represents	Uniform Resource Identifier scheme (Q37071)
Data type	External identifier
Domain	set (Q36161) (any class which contains items which may be referenced by a URI scheme), and as a particular example: network service (Q1640628) (note: this should be moved to the property statements)
Allowed values	regex: [a-z][a-z0-9+\-.]* (note: this information should be moved to a property statement; use property format as a regular expression (P1793))
Example	According to this template: filename (Q1144928) → file, website (Q35127) → https, email address (Q1273217) → mailto, telephone number (Q214995) → tel, IRC server instance (Q18511644) → irc, According to statements in the property: telephone number (Q214995) → tel HTTP (Q8777) → http When possible, data should only be stored as statements
Source	https://www.iana.org/assignments/uri-schemes/uri-schemes.xhtml
See also	IANA service name (P5814)
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/P4742 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 1,445 Main statement 396 27.4% of uses Qualifier 15 1% of uses Reference 1,034 71.6% of uses
Search for values

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

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/P4742#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/P4742#Unique value, SPARQL (every item), SPARQL (by value)

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

List of violations of this constraint: Database reports/Constraint violations/P4742#Scope, hourly updated report, 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/P4742#Entity types