Versioned (coeus-api-all 2105.0003 API)

```
public interface Versioned
```
This interface can be used to identify a object which has a version number that is used for the purposes of optimistic locking.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  Long getVersionNumber()
  Returns the version number for this object.

- Method Detail
  - getVersionNumber
```
Long getVersionNumber()
```
    Returns the version number for this object. In general, this value should only be null if the object has not yet been stored to a persistent data store. This version number is generally used for the purposes of optimistic locking.
    
    Returns:
    
    the version number, or null if one has not been assigned yet