Slot: identifier

True means that the slot is the identifier slot of its class. Such a slot uniquely identifies instances of the class throughout an entire document, meaning there cannot be two (or more) instances of the class (or instances of any of its descendants) with the same value for the identifier slot anywhere in the document.

URI: linkml:identifier

Applicable Classes

Name	Description	Modifies Slot
SlotDefinition	an element that describes how instances are related to other instances	no

Properties

Type and Range

Property	Value
Range	Boolean
Domain	SlotDefinition
Domain Of	SlotDefinition

Cardinality and Requirements

Property	Value
### Slot Characteristics

Property	Value
Inherited	Yes

In Subsets

• SpecificationSubset
• MinimalSubset
• BasicSubset
• RelationalModelProfile

Aliases

• primary key
• ID
• UID
• code

Comments

• The identifier slot is inherited.
• A domain can have at most one identifier slot OR a key slot. However a domain can have both an identifier slot and any number of compound keys.
• An identifier slot is automatically required. Identifiers cannot be optional.
• The presence of an identifier slot makes a class eligible for inlining as a dictionary.
• The presence of an identifier slot makes a class eligible for being referenced rather than inlined.

See Also

• https://en.wikipedia.org/wiki/Identifier
• https://linkml.io/linkml/schemas/constraints.html#unique-keys
• https://linkml.io/linkml/schemas/inlining.html
• linkml:unique_keys
• linkml:key

Identifier and Mapping Information

Administrative Metadata

Rank: 5

Schema Source

• from schema: https://w3id.org/linkml/meta

Mappings

Mapping Type	Mapped Value
self	linkml:identifier
native	linkml:identifier

LinkML Source

name: identifier
description: True means that the slot is the identifier slot of its class. Such a
  slot uniquely identifies instances of the class throughout an entire document, meaning
  there cannot be two (or more) instances of the class (or instances of any of its
  descendants) with the same value for the identifier slot anywhere in the document.
comments:
- The identifier slot is inherited.
- A domain can have at most one identifier slot OR a key slot. However a domain can
  have both an identifier slot and any number of compound keys.
- An identifier slot is automatically required. Identifiers cannot be optional.
- The presence of an identifier slot makes a class eligible for inlining as a dictionary.
- The presence of an identifier slot makes a class eligible for being referenced rather
  than inlined.
in_subset:
- SpecificationSubset
- MinimalSubset
- BasicSubset
- RelationalModelProfile
from_schema: https://w3id.org/linkml/meta
see_also:
- https://en.wikipedia.org/wiki/Identifier
- https://linkml.io/linkml/schemas/constraints.html#unique-keys
- https://linkml.io/linkml/schemas/inlining.html
- linkml:unique_keys
- linkml:key
aliases:
- primary key
- ID
- UID
- code
rank: 5
domain: slot_definition
inherited: true
domain_of:
- slot_definition
range: boolean