Generalized parton distributions and deeply virtual Compton scattering

17 pages, 7 figures, to appear in JPhysGInternational audienceWe present a method which allows to extract theoretical informations out of a limited set of experimental data and observables, forming up in general an under- constrained system. It has been applied to the field of nucleon structure, in the domain of Generalized Parton Distributions (GPDs). We take advantage of this review to remove a couple of approximations that we used in our previous works and update our results using the latest data published