ForeignTable (core 0.8.1 API)

```
@Retention(RUNTIME)
@Target(FIELD)
public @interface ForeignTable
```
Indicates a foreign key exists on the linked entity. It is transient, meaning there is no corresponding column for this attribute.

- Required Element Summary
  
  Required Elements
  Modifier and Type Required Element Description
  
  String joinKey
  Indicates which attribute in the linked entity is the foreign key to use for this link.
- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  boolean optional
  Specifies if the link is optional or not.

- Element Detail
  - joinKey
```
String joinKey
```
    Indicates which attribute in the linked entity is the foreign key to use for this link.
- - optional
```
boolean optional
```
    Specifies if the link is optional or not. If not optional, it means it should always exist a linked entity with a foreign key linked to this entity.
    
    Default:
    
    true