Slot: required
true means that the slot must be present in instances of the class definition
URI: [linkml:required](https://w3id.org/linkml/required)
## Applicable Classes
| Name | Description | Modifies Slot |
| --- | --- | --- |
| [SlotExpression](SlotExpression.md) | an expression that constrains the range of values a slot can take | no |
| [AnonymousSlotExpression](AnonymousSlotExpression.md) | | no |
| [SlotDefinition](SlotDefinition.md) | an element that describes how instances are related to other instances | no |
## Properties
### Type and Range
| Property | Value |
| --- | --- |
| Range | [Boolean](Boolean.md) |
| Domain | [SlotDefinition](SlotDefinition.md) |
| Domain Of | [SlotExpression](SlotExpression.md) |
### Cardinality and Requirements
| Property | Value |
| --- | --- |
### Slot Characteristics
| Property | Value |
| --- | --- |
| Inherited | Yes |
## In Subsets
* [SpecificationSubset](SpecificationSubset.md)
* [MinimalSubset](MinimalSubset.md)
* [BasicSubset](BasicSubset.md)
* [RelationalModelProfile](RelationalModelProfile.md)
* [ObjectOrientedProfile](ObjectOrientedProfile.md)
## Identifier and Mapping Information
### Administrative Metadata
**Rank:** 8
### Schema Source
* from schema: https://w3id.org/linkml/meta
## Mappings
| Mapping Type | Mapped Value |
| --- | --- |
| self | linkml:required |
| native | linkml:required |
## LinkML Source
name: required
description: true means that the slot must be present in instances of the class definition
in_subset:
- SpecificationSubset
- MinimalSubset
- BasicSubset
- RelationalModelProfile
- ObjectOrientedProfile
from_schema: https://w3id.org/linkml/meta
rank: 8
domain: slot_definition
inherited: true
domain_of:
- slot_expression
range: boolean