The Vienna Convention on Diplomatic Relations, 1961 primarily consoli-

dated the practice of diplomats, which receiving States and sending States

developed over the centuries. From this standpoint, the Convention does not

provide any new information to the reader. The customary rules of diplomatic

practice have always provided guidance to States about issues relating to the

subject matters of the Convention. Indeed, the Preamble to the Convention

affirmed that:

``. . . the rules of customary international law should continue to govern

questions not expressly regulated by the provisions of the present Convention.''