# Class: Schema



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




```mermaid
 classDiagram
    class Schema
      Schema : fields
        
          Schema --> Field : fields
        
      Schema : foreignKeys
        
          Schema --> ForeignKeys : foreignKeys
        
      Schema : missingValues
        
          Schema --> None : missingValues
        
      Schema : primaryKey
        
          Schema --> Field : primaryKey
        
      
```




<!-- no inheritance hierarchy -->


## Slots

| Name | Cardinality and Range | Description | Inheritance |
| ---  | --- | --- | --- |
| [fields](fields.md) | 0..* <br/> [Field](Field.md) |  | direct |
| [missingValues](missingValues.md) | 0..* <br/> [String](String.md) |  | direct |
| [primaryKey](primaryKey.md) | 0..* <br/> [Field](Field.md) |  | direct |
| [foreignKeys](foreignKeys.md) | 0..* <br/> [ForeignKeys](ForeignKeys.md) |  | direct |





## Usages

| used by | used in | type | used |
| ---  | --- | --- | --- |
| [Resource](Resource.md) | [schema](schema.md) | range | [Schema](Schema.md) |






## Identifier and Mapping Information







### Schema Source


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





## Mappings

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





## LinkML Source

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

### Direct

<details>
```yaml
name: Schema
from_schema: https://w3id.org/linkml/frictionless
slots:
- fields
- missingValues
- primaryKey
- foreignKeys
slot_usage:
  fields:
    name: fields
    domain_of:
    - Reference
    - ForeignKeys
    - Schema
    inlined: true
    inlined_as_list: true

```
</details>

### Induced

<details>
```yaml
name: Schema
from_schema: https://w3id.org/linkml/frictionless
slot_usage:
  fields:
    name: fields
    domain_of:
    - Reference
    - ForeignKeys
    - Schema
    inlined: true
    inlined_as_list: true
attributes:
  fields:
    name: fields
    from_schema: https://w3id.org/linkml/frictionless
    rank: 1000
    multivalued: true
    alias: fields
    owner: Schema
    domain_of:
    - Reference
    - ForeignKeys
    - Schema
    range: Field
    inlined: true
    inlined_as_list: true
  missingValues:
    name: missingValues
    from_schema: https://w3id.org/linkml/frictionless
    rank: 1000
    multivalued: true
    alias: missingValues
    owner: Schema
    domain_of:
    - Schema
  primaryKey:
    name: primaryKey
    examples:
    - value: id
    from_schema: https://w3id.org/linkml/frictionless
    close_mappings:
    - linkml:identifier
    - linkml:unique_keys
    rank: 1000
    multivalued: true
    alias: primaryKey
    owner: Schema
    domain_of:
    - Schema
    range: Field
  foreignKeys:
    name: foreignKeys
    examples:
    - value: '[''$ref:ForeignKeys'', ''$ref:ForeignKeys'']'
    from_schema: https://w3id.org/linkml/frictionless
    rank: 1000
    multivalued: true
    alias: foreignKeys
    owner: Schema
    domain_of:
    - Schema
    range: ForeignKeys

```
</details>