DataValidationFailureCallback (jndn 0.22 API)

```
public interface DataValidationFailureCallback
```
A class implements DataValidationFailureCallback if it has a failureCallback method used to report a failed Data validation.

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`failureCallback(Data data, ValidationError error)`

void failureCallback(Data data,
                     ValidationError error)

Interface DataValidationFailureCallback