FeatureLabelCallback (Charba - J2CL and GWT charts library based on CHART.JS)

```
public interface FeatureLabelCallback
```
Callback to implement to get the label for each Feature to use in the Labels and Tooltips.

Author:

Andrea "Stock" Stocchero

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`label(Feature feature)`	Return a value that represents the name for the feature to use on `Labels` and `Tooltips`.

- Method Detail
  - label
```
String label(Feature feature)
```
    Return a value that represents the name for the feature to use on Labels and Tooltips.
    
    Parameters:
    
    feature - current element being processed in the list.
    
    Returns:
    
    a value that represents the name for the feature to use on Labels and Tooltips