Pierre, M, Pacaud, F, Adami, C, Alis, S, Altieri, B, Baran, B, Benoist, C, Birkinshaw, M, Bongiorno, A, Bremer, MN, Brusa, M, Butler, A, Ciliegi, P, Chiappetti, L, Clerc, N, Corasaniti, PS, Coupon, J, Breuck, CD, Democles, J, Desai, S et al, Delhaize, J, Devriendt, J, Dubois, Y, Eckert, D, Elyiv, A, Ettori, S, Evrard, A, Faccioli, L, Farahi, A, Ferrari, C, Finet, F, Fotopoulou, S, Fourmanoit, N, Gandhi, P, Gastaldello, F, Gastaud, R, Georgantopoulos, I, Giles, P, Guennou, L, Guglielmo, V, Horellou, C, Husband, K, Huynh, M, Iovino, A, Kilbinger, M, Koulouridis, E, Lavoie, S, Brun, AMCL, Fevre, JPL, Lidman, C, Lieu, M, Lin, CA, Mantz, A, Maughan, BJ, Maurogordato, S, McCarthy, IG, McGee, S, Melin, JB, Melnyk, O, Menanteau, F, Novak, M, Paltani, S, Plionis, M, Poggianti, BM, Pomarede, D, Pompei, E, Ponman, TJ, Ramos-Ceja, ME, Ranalli, P, Rapetti, D, Raychaudury, S, Reiprich, TH, Rottgering, H, Rozo, E, Rykoff, E, Sadibekova, T, Santos, J, Sauvageot, JL, Schimd, C, Sereno, M, Smith, GP, Smolčić, V, Snowden, S, Spergel, D, Stanford, S, Surdej, J, Valageas, P, Valotti, A, Valtchanov, I, Vignali, C, Willis, J and Ziparo, F (2015) The XXL Survey: I. Scientific motivations - XMM-Newton observing plan - Follow-up observations and simulation programme. Astronomy and Astrophysics. ISSN 0004-6361