# Simple Extensible Human Notation (.sehn)

## Base Kinds

| name   | description                |
| ------ | -------------------------- |
| `none` | Represents nothing         |
| `bool` | Represents a boolean value |
| `real` | Represents a real number   |
| `text` | Represents text            |
| `dict` | A key-value structure      |
| `list` | A collection structure     |
| `kind` | A reflective kind          |

### `none`

A `none` represents the absence of any value.

### `bool`

1. `true`
2. `false`

### `real`

1. `<int>`
2. `<sig>e<exp>`
3. `<int>.<frac>`

| part   | allowed value   |
| ------ | --------------- |
| `int`  | `-?[1-9][0-9]*` |
| `frac` | `[0-9]*`        |
| `sig`  | `<int>`         |
| `exp`  | `<int>`         |

### `text`

1. `"<text>"`
2. Multiline:
    ```
    `
        "<text>"
        "<text>"
    `
    ```

A `text` value holds low and behold, text.

### `dict`

1. `{"<text>": <any>, ...}`

A dictionary is a structure with `text` keys mapping to any value.

### `list`

1. `[<any>, ...]`

A list is a structure with a sequence of any value.

### `kind`

1. `<base-kind>`
2. `<standard-kind>`
2. `<app-kind>`

| kind              | allowed value                              |
| ----------------- | ------------------------------------------ |
| `<base-kind>`     | `none\|bool\|real\|text\|dict\|list\|kind` |
| `<standard-kind>` | `(?!(<base-kind>))[a-z][a-z0-9/]*`         |
| `<app-kind>`      | `[A-Z][a-zA-Z0-9\]*`                       |