Property: identifier

A unique number, code, or reference value assigned to an information resource within a given context.

A unique identifier of the resource being described or catalogued.

Obligation and Cardinality

The table below details the classes which use this property and the conditions of its use.

Class	Range	Obligation	Cardinality
CataloguedResource	Uriorcurie	Mandatory	One
Distribution	Uriorcurie	Mandatory	One
Organisation	Uriorcurie	Mandatory	One
DataService	Uriorcurie	Mandatory	One
Dataset	Uriorcurie	Mandatory	One

Usage Notes

Purpose

Use of identifier supports unambiguous identification of resources, helps to prevent duplication, allows for interoperability with other metadata management systems, and facilitates retrieval, as users may retrieve resources by specific identifiers.

Guidelines

As a best practice, all known unique identifiers should be included.

IDENTIFIER (OTHER) is a container element with sub-elements. Metadata values are contained in the sub-elements.

Each IDENTIFIER (OTHER) element has two mandatory sub-elements

Identifier (Other) Type
The formal name given to the type of identifier – Choose from a controlled vocabulary. See Appendix B for a list of current Identifier (Other) types. If the type of identifier is not available and the option "local identifier" is not suitable, contact the Government Data Catalogue administrator team to add the identifier type to the controlled vocabulary. E.g. ISBN (print) or ISSN (online).
Identifier Value
The unique value of the identifier for the specific identifier type.

For ISBNs, enter the complete ISBN without hyphens. For all other identifiers, enter as they appear in the described resource.

TODOs

Update guidance based on how identifier is being used in the model

Identifier and Mapping Information

Schema Source

from schema: https://github.com/co-cddo/ukgov-metadata-exchange-model/blob/main/src/model/uk_cross_government_metadata_exchange_model.yaml

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