# Untitled boolean in TypeDeclaration Schema

```txt
https://amazonalexa.com/ask/2020/12/TypeDeclaration#/properties/properties/items/properties/optional
```

Indicates whether the property is required in expressions of this type.

| Abstract            | Extensible | Status         | Identifiable            | Custom Properties | Additional Properties | Access Restrictions | Defined In                                                                          |
| :------------------ | :--------- | :------------- | :---------------------- | :---------------- | :-------------------- | :------------------ | :---------------------------------------------------------------------------------- |
| Can be instantiated | No         | Unknown status | Unknown identifiability | Forbidden         | Allowed               | none                | [TypeDeclaration.json\*](../../schemas/TypeDeclaration.json "open original schema") |

## optional Type

`boolean`