[JURIST] European Union officials are encouraged by Spain's overwhelming support in Sunday's referendum [JURIST report] for the body's proposed new Constitution [PDF], but remain guarded because there are still many challenges ahead in the numerous countries set to cast similar ballots over the next 18 months. According to the official results [Spain's official referendum website, in Spanish], more than 76 percent of Spaniards casting ballots supported the Constitution, but the nation did suffer a low turnout of 42 percent. The document must be ratified by all 25 member states before it takes effect. Spain's University of Zaragoza provides a wealth of resources on the proposed Constitution, including historical background and a step-by-step timeline on the constitutional process. AFP has more.