Hi Mustafa, thanks for your answer.
Your links are quite good and gave me a good vision of how I could achieve my goal.
However, features described there, as Reiner Hille-Doering suggests, such as getDataSource are defined as "hidden" features in DS 1.3 and will maybe be modified in the futur.
Can someone confirm me (or not) if something has changed in DS1.4 on this subject ?
Thanks.
Br,
Vincent