1The practice of States plays a number of important roles in international law. This entry, however, is chiefly concerned with State practice as constituent element of customary international law, one of the principal sources of international law. State practice is creative, or expressive, of rules of customary international law, but only in so far as it is undertaken with the conviction that a legal right or obligation is involved (acceptance as law, or opinio iuris). A rigid distinction between State practice and opinio iuris as the two constituent elements of...
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