How to implement and add en extended service to EasyVIPER?

As EasyVIPER is an extensible engine, it is possible to add specific services, thanks to the

interface.
To create a new extended service, the basic thing is to develop a class implementing this interface, and then to add the service to a core instance of EasyVIPER.

A good way to perform this task follows these steps:

1. Create an interface that extends Service with specific operations

1. Create the class implementing
   Unknown macro: {MyExtendedService}

   and extending the utility abstract class

   Unknown macro: {AbstractServiceImpl}

   :

The method

can be filled as in the example for a by default behaviour.