2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/139708The contribution of both inclusive and exclusive cross-section data from HERA to our knowledge of parton distribution functions is reviewed and future prospects are outlined.11 pages, 11 figures. Invited talk at Hadron Structure '07, Modra-Harmonia, Slovakia, Sep 2007. To appear in proceedingsHigh Energy Physics - PhenomenologyHigh Energy Physics - Experimenttext