The Parameter annotation describes some informations needed to characterize
 inputs and outputs for discoverers (
IDiscoverer)
 The developer is free to annotate directly a Java field or a getter/setter
 method, or both field and getter/setter with a same id.
 An input data is supposed to be valued before a discovery is launched : At
 least a setter method (preferred) or a public field (discouraged) must be
 proposed.
 An output data is supposed to be accessed after a discovery treatment : At
 least a setter method (preferred) or a public field (discouraged) must be
 proposed.
 A data both input and output of the discovery must respond to both previous
 conditions.
 Using the annotation will throw compilation errors in the following cases :
 
 - 
 annotating a non public field
 
- 
 annotating a static field/method
 
- 
 annotating a non getter/setter method (e.g. a method which has a java
 parameter or returns void)
 
- 
 annotating with the same id some field, getter, setter related to different
 Java types
 
- 
 annotating more than one field with the same id
 
- 
 annotating more than one getter with the same id
 
- 
 annotating more than one setter with the same id
 
- 
 giving some "required" value on a getter (a getter describes an output data)