# Class: Constraints



URI: [frictionless:Constraints](https://w3id.org/linkml/frictionless/Constraints)




```mermaid
 classDiagram
    class Constraints
      Constraints : pattern
        
          Constraints --> None : pattern
        
      Constraints : required
        
      Constraints : unique
        
      
```




<!-- no inheritance hierarchy -->


## Slots

| Name | Cardinality and Range | Description | Inheritance |
| ---  | --- | --- | --- |
| [required](required.md) | 0..1 <br/> [Boolean](Boolean.md) |  | direct |
| [pattern](pattern.md) | 0..1 <br/> [String](String.md) |  | direct |
| [unique](unique.md) | 0..1 <br/> [Boolean](Boolean.md) |  | direct |





## Usages

| used by | used in | type | used |
| ---  | --- | --- | --- |
| [Field](Field.md) | [constraints](constraints.md) | range | [Constraints](Constraints.md) |






## Identifier and Mapping Information







### Schema Source


* from schema: https://w3id.org/linkml/frictionless





## Mappings

| Mapping Type | Mapped Value |
| ---  | ---  |
| self | frictionless:Constraints |
| native | frictionless:Constraints |





## LinkML Source

<!-- TODO: investigate https://stackoverflow.com/questions/37606292/how-to-create-tabbed-code-blocks-in-mkdocs-or-sphinx -->

### Direct

<details>
```yaml
name: Constraints
from_schema: https://w3id.org/linkml/frictionless
slots:
- required
- pattern
- unique

```
</details>

### Induced

<details>
```yaml
name: Constraints
from_schema: https://w3id.org/linkml/frictionless
attributes:
  required:
    name: required
    from_schema: https://w3id.org/linkml/frictionless
    rank: 1000
    slot_uri: linkml:required
    alias: required
    owner: Constraints
    domain_of:
    - Constraints
    range: boolean
  pattern:
    name: pattern
    from_schema: https://w3id.org/linkml/frictionless
    rank: 1000
    slot_uri: linkml:pattern
    alias: pattern
    owner: Constraints
    domain_of:
    - Constraints
  unique:
    name: unique
    from_schema: https://w3id.org/linkml/frictionless
    rank: 1000
    slot_uri: linkml:identifier
    alias: unique
    owner: Constraints
    domain_of:
    - Constraints
    range: boolean

```
</details>