KeyColumns (OpenJPA Parent POM 4.0.0 API)

```
@Target({METHOD,FIELD})
@Retention(RUNTIME)
public @interface KeyColumns
```
Allows the specification of multiple map key columns for complex mappings.

Since:

0.4.0, 1.1.0

Author:

Abe White

- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  KeyColumn[] value

- Element Detail
  - value
```
KeyColumn[] value
```
    Default:
    
    {}