The visitor descriptor model allows to describe the rules to apply to cross a model and generate the 
documentation. 


This model will allow to the user how to visit the model to generate the documentation.

#Start points:
##an object of the user model, by default, the root of the model
##all objects matching a given metaclass (EClass concept in Ecore)
##all objects stereotyped with a given stereotype


#Second point: 
##an EStructuralFeature of the choose object or Stereotype

#Third point
##all objects matching a given metaclass (EClass concept in Ecore)
##all objects stereotyped with a given stereotype

#Next point
##We continue alterning Second Point and Third Point