Json.SubType (jsonb 1.3-RC1 API)

```
@Retention(CLASS)
@Target(TYPE)
@Repeatable(SubTypes.class)
public static @interface Json.SubType
```
Specify the subtypes that a given type can be represented as.
This is used on an interface type, abstract type or type with inheritance to indicate all the concrete subtypes that can represent the type.
In the example below the abstract Vehicle type has 2 concrete subtypes of Car and Truck that can represent the type.
```
{@code
```

- Required Element Summary
  
  Required Elements
  Modifier and Type Required Element Description
  
  Class<?> type
  The concrete type that extends or implements the base type.
- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  String name
  The name or "discriminator value" that is used to identify the type.

- Element Detail
  - type
```
Class<?> type
```
    The concrete type that extends or implements the base type.
- - name
```
String name
```
    The name or "discriminator value" that is used to identify the type.
    When unspecified this is the short name of the class.
    
    Default:
    
    ""