Slot: expression
A formal (executable) expression of a constraint.
URI: [oscal:expression](https://w3id.org/lmodel/oscal/expression)
## Applicable Classes
| Name | Description | Modifies Slot |
| --- | --- | --- |
| [ConstraintTest](ConstraintTest.md) | A test expression which is expected to be evaluated by a tool | yes |
## Properties
### Type and Range
| Property | Value |
| --- | --- |
| Range | [String](String.md) |
| Domain Of | [ConstraintTest](ConstraintTest.md) |
### Cardinality and Requirements
| Property | Value |
| --- | --- |
## Identifier and Mapping Information
### Schema Source
* from schema: https://w3id.org/lmodel/oscal
## Mappings
| Mapping Type | Mapped Value |
| --- | --- |
| self | oscal:expression |
| native | oscal:expression |
## LinkML Source
name: expression
description: A formal (executable) expression of a constraint.
from_schema: https://w3id.org/lmodel/oscal
rank: 1000
domain_of:
- ConstraintTest
range: string