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

# Extending Schema

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

This is an extending schema. It pulls `definitions` from other schemas.

| [Abstract](../abstract.md) | Extensible | [Status](../status.md) | Identifiable | Custom Properties | Additional Properties | Defined In                                     |
| -------------------------- | ---------- | ---------------------- | ------------ | ----------------- | --------------------- | ---------------------------------------------- |
| Can be instantiated        | Yes        | Experimental           | Yes          | Forbidden         | Permitted             | [extending.schema.json](extending.schema.json) |

## Schema Hierarchy

- Extending `https://example.com/schemas/extending`
  - [Extensible](extensible.schema.md) `https://example.com/schemas/extensible`
  - [Definitions](definitions.schema.md) `https://example.com/schemas/definitions`

# Extending Properties

| Property           | Type     | Required   | Nullable | Defined by                                  |
| ------------------ | -------- | ---------- | -------- | ------------------------------------------- |
| [@id](#id)         | `string` | Optional   | No       | [Definitions](definitions.schema.md#id)     |
| [bar](#bar)        | `string` | Optional   | No       | [Extensible](extensible.schema.md#bar)      |
| [baz](#baz)        | `string` | Optional   | No       | Extending (this schema)                     |
| [id](#id-1)        | `string` | Optional   | No       | [Definitions](definitions.schema.md#id-1)   |
| [meta:id](#metaid) | `string` | Optional   | No       | [Definitions](definitions.schema.md#metaid) |
| `*`                | any      | Additional | Yes      | this schema _allows_ additional properties  |

## @id

An `id` with an `@` in front of it. The `@` stands for "dot com"

`@id`

- is optional
- type: `string`
- defined in [Definitions](definitions.schema.md#id)

### @id Type

`string`

- format: `uri` – Uniformous Resource Identifier (according to [RFC3986](http://tools.ietf.org/html/rfc3986))

## bar

A horse walks into it.

`bar`

- is optional
- type: `string`
- defined in [Extensible](extensible.schema.md#bar)

### bar Type

`string`

### bar Examples

```json
"whoo"
```

```json
"hoo"
```

## baz

### BAAAZ!

This property has a unique name to demonstrate it's uniqueness.

`baz`

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

### baz Type

`string`

### baz Example

```json
"I'm just a humble example"
```

## id

A unique identifier given to every addressable thing.

`id`

- is optional
- type: `string`
- defined in [Definitions](definitions.schema.md#id-1)

### id Type

`string`

- format: `uri-reference` – URI Reference (according to [RFC3986](https://tools.ietf.org/html/rfc3986))

## meta:id

An about ids. It is meta. If you are confused, send an email to the address specified in this property value.

`meta:id`

- is optional
- type: `string`
- defined in [Definitions](definitions.schema.md#metaid)

### meta:id Type

`string`

- format: `email` – email address (according to [RFC 5322, section 3.4.1](https://tools.ietf.org/html/rfc5322))

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

#### Requirement 1

- []() – `https://example.com/schemas/extensible#/definitions/second`

#### Requirement 2

- []() – `https://example.com/schemas/definitions#/definitions/myid`

#### Requirement 3

- []() – `#/definitions/third`