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

# Custom Schema

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

This is an extensible schema. It has `definitions`, that can be used in other schemas. Additionally, it allows custom
properties.

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

# Custom Properties

| Property    | Type     | Required   | Nullable | Defined by                                 |
| ----------- | -------- | ---------- | -------- | ------------------------------------------ |
| [bar](#bar) | `string` | Optional   | No       | Custom (this schema)                       |
| [foo](#foo) | `string` | Optional   | No       | Custom (this schema)                       |
| `*`         | any      | Additional | Yes      | this schema _allows_ additional properties |

## bar

A unique identifier given to every addressable thing.

`bar`

- is optional
- type: `string`
- defined in this schema

### bar Type

`string`

## foo

A unique identifier given to every addressable thing.

`foo`

- is optional
- type: `string`
- defined in this schema

### foo Type

`string`

**All** of the following _requirements_ need to be fulfilled.

#### Requirement 1

- []() – `https://ns.adobe.com/xdm/common/extensible.schema.json#/definitions/@context`

#### Requirement 2

- []() – `#/definitions/first`

#### Requirement 3

- []() – `#/definitions/second`