16
The law of treaties
Compared with municipal law the various methods by which rights and
duties may be created in international law are relatively unsophisticated.
1
Within a state, legal interests may be established by contracts between two
or more persons, or by agreements under seal, or under the developed sys-
tem for transferring property, or indeed by virtue of legislation or judicial
decisions. International law is more limited as far as the mechanisms for
the creation of new rules are concerned. Custom relies upon a measure
of state practice supported by opinio juris and is usually, although not
invariably, an evolving and timely process. Treaties, on the other hand,
are a more direct and formal method of international law creation.
States transact a vast amount of work by using the device of the treaty,
in circumstances which underline the paucity of international law pro-
cedures when compared with the many ways in which a person within
a state’s internal order may set up binding rights and obligations. For
instance, wars will be terminated, disputes settled, territory acquired,
1
See generally A. D. McNair, The Law of Treaties, Oxford, 1961; J. Klabbers, The Concept
of Treaty in International Law, Dordrecht, 1996; A. Aust, Modern Treaty Law and Practice,
2nd edn, Cambridge, 2007; M. Fitzmaurice and O. Elias, Contemporary Issues in the Law
of Treaties, Utrecht, 2005; Les Conventions de Vienne de 1969 et de 1986 sur le Droit des
Trait´es: Commentaire Article par Article (eds. O. Corten and P. Klein), Brussels, 3 vols.,
2006; Developments of International Law in Treaty Making (eds. R. Wolfrum and V. R
¨
oben),
Berlin, 2005; Multilateral Treaty Calendar (ed. C. Wiktor), The Hague, 1998; Multilateral
Treaty-Making (ed. V. Gowlland-Debas), The Hague, 2000; I. Detter, Essays on the Law of
Treaties, Stockholm, 1967; T. O. Elias, The Modern Law of Treaties, London, 1974; D. P.
O’Connell, International Law, 2nd edn, London, 1970, vol. I, pp. 195 ff.; I. Sinclair, The
Vienna Convention on the Law of Treaties, 2nd edn, Manchester, 1984; P. Reuter, Introduction
to the Law of Treaties, 2nd edn, Geneva, 1995; S. Bastid, Les Trait´es dans la Vie Internationale,
Paris, 1985, and S. Rosenne, Developments in the Law of Treaties 1945–1986, Cambridge,
1989. See also Oppenheim’s International Law (eds. R. Y. Jennings and A. D. Watts), 9th edn,
London, 1992, p. 1197; Nguyen Quoc Dinh, P. Daillier and A. Pellet, Droit International
Public, 7th edn, Paris, 2002, p. 117; I. Brownlie, Principles of Public International Law, 6th
edn, Oxford, 2003, chapter 27, and M. Fitzmaurice, ‘Actors and Factors in the Evolution of
Treaty Norms (An Empirical Study)’, 4 Austrian Review of International and European Law,
1999, p. 1.
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