21The main purpose of the jurisdiction conferred on the Court by Article 234 EC is to ensure that Community law is applied uniformly by national courts. That requirement of uniformity is particularly vital where the validity of a Community act is in question. Differences between courts of the Member States as to the validity of Community acts would be liable to jeopardise the essential unity of the Community legal order and undermine the fundamental requirement of legal certainty (Foto-Frost, paragraph 15).
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