Slot: required
Indicates whether this parameter must be provided when the containing expression is evaluated (technical constraint).
URI: [odm:slot/required](https://cdisc.org/odm2/slot/required)
## Applicable Classes
| Name | Description | Modifies Slot |
| --- | --- | --- |
| [Parameter](../classes/Parameter.md) | A variable element that describes an input used in a formal expression | no |
## Properties
### Type and Range
| Property | Value |
| --- | --- |
| Range | [Boolean](../types/Boolean.md) |
| Domain Of | [Parameter](../classes/Parameter.md) |
### Cardinality and Requirements
| Property | Value |
| --- | --- |
### Slot Characteristics
| Property | Value |
| --- | --- |
| If Absent | `False` |
| Owner | [Parameter](../classes/Parameter.md) |
## Identifier and Mapping Information
### Schema Source
* from schema: https://cdisc.org/dds
## Mappings
| Mapping Type | Mapped Value |
| --- | --- |
| self | odm:required |
| native | odm:required |
## LinkML Source
name: required
description: Indicates whether this parameter must be provided when the containing
expression is evaluated (technical constraint).
from_schema: https://cdisc.org/dds
rank: 1000
ifabsent: 'False'
owner: Parameter
domain_of:
- Parameter
range: boolean