x     A month after the provisional entry into force of the trade agreement between the European Union (EU) and Mercosur, exchanges have been governed since May 1 by the terms agreed upon, while political and legal attention in Brussels centers on the EU Court of Justice, which must rule on the validity of the mechanism chosen to launch the treaty. The referral to the bloc's top court stemmed from a European Parliament resolution, passed in January by a narrow margin (334 votes in favor and 324