- Diplomatic immunity — Diplomatic missions — Diplomatic relations — Diplomatic privileges
This chapter describes the Preamble of the Vienna Convention on Diplomatic Relations set forth by the International Law Commission, the main legal body which promotes the progressive development of international law and oversees its codification. It briefly describes three theories that form as the basis of the statements written at the Preamble —the ‘exterritoriality’ theory, the ‘representative character’ theory, and the ‘functional necessity’ theory. All of these theories heavily influence matters regarding diplomatic privileges and immunities. Ultimately, the Preamble to the Convention has two important legal functions—to state the view of the participating States on the theoretical basis of diplomatic privileges and immunities, and to make explicit the relationship between the Convention and customary international law.