Property talk:P380

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Colon Classification
type of library classification, to be used for topics, not for written works; use with qualifier "edition" with item value "CC 6" or "CC 7"

Data type	External identifier
Allowed values	[a-zA-ZΔΣ0-9-]+[a-zA-Z0-9\.\:\;\,\(\)\'\s]*
Source	http://scigator.unipv.it/cc/
See also	Dewey Decimal Classification (P379)
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 Gratispaideia 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)> Map Random list
Proposal discussion	Originally created without a formal discussion
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Format “[a-zA-ZΔΣ0-9-]+[a-zA-Z0-9\.\:\;\,\(\)\'\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/P380#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/P380#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/P380#Unique value, SPARQL (every item), SPARQL (by value)

Qualifiers “reason for deprecated rank (P344), reason for preferred rank (P345), has edition or translation (P381)”: 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/P380#Allowed qualifiers, 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/P380#allowed entity types

Scope is as main value (Q793): 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/P380#scope, SPARQL