7.27 Pursuant to Article 3.2 of the DSU and in accordance with Appellate Body decisions , we should, when trying to clarify the scope of Article ⅩⅩ, have recourse to customary rules of interpretation of public international law. We note that Article 31（1） of the Vienna Convention on the Law of Treaties （1969） （hereafter the “Vienna Convention”） provides that:
“A treaty shall be interpreted in good faith in accordance with the ordinary meaning to be given to the terms of the treaty in their context and in the light of its object and purpose”.