---
template: reference
foo: bar
---

# Constant Types Schema

```
https://example.com/schemas/constants
```

This is an example schema with examples for properties with constant values

| [Abstract](../abstract.md) | Extensible | [Status](../status.md) | Identifiable | Custom Properties | Additional Properties | Defined In                                     |
| -------------------------- | ---------- | ---------------------- | ------------ | ----------------- | --------------------- | ---------------------------------------------- |
| Can be instantiated        | No         | Experimental           | No           | Forbidden         | Permitted             | [constants.schema.json](constants.schema.json) |

# Constant Types Properties

| Property        | Type    | Required     | Nullable | Defined by                                 |
| --------------- | ------- | ------------ | -------- | ------------------------------------------ |
| [hello](#hello) | `const` | **Required** | No       | Constant Types (this schema)               |
| `*`             | any     | Additional   | Yes      | this schema _allows_ additional properties |

## hello

A simple string, without strong constraints.

`hello`

- is **required**
- type: `const`
- defined in this schema

The value of this property **must** be equal to:

```json
"World"
```