  The multi-objective optimization problem has always been the main objective
of the principal traditional approaches, such as Ranking queries and Skyline
queries. The conventional idea was to either use one or the other, trying to
exploit both ranking queries advantages when it comes to taking into account
user preferences, and skyline queries points of strength when the main
objective was to obtain interesting results from a dataset in a simple, yet
effective fashion, both of them showing limitations when entering specific
fields of interest.
