Résumé en anglais

The Fuzzy Semantic Model (FSM) is a database model that has been recently proposed. In addition to supporting the fuzziness at the attribute level, FSM authorizes also an entity to be partially member of its class according to a given degree of memb ership that reflects the level to which the entity verifies the extent properties of this class. It also supports subclass/superclass membership functions permitting to calculate the range to which a class is a subclass of another class. In this paper , we provide the ways the membership function is defined for all the constructs of the model. We also introduce the definition of membership function at subclass/superclass relationships levels. The paper includes also the first results of an ongoing implementation of our works at automotive company PSA Peugeot Citroen.