International organizations — Immunity — Jurisdictional immunity — National of foreign State employed by international organization as chauffeur — Contract of employment — Claim for unfair dismissal — Whether international organization entitled to jurisdictional immunity — Whether any rule of customary international law recognizing jurisdictional immunity of international organization in absence of binding treaty provision

Relationship of international law and municipal law — Treaties — Treaty approved by legislature — Whether treaty possessing legal effect in national law before entry into force in international law

Treaties — Entry into force — Conditions — Multilateral treaties — Requirement of ratification by legislature — Whether ratification sufficient for entry into force in domestic legal order where treaty not yet in force at international level in absence of requisite number of ratifications — Bilateral treaty — Requirement of assent by legislature — Whether absence of assent preventing enforcement of treaty in domestic legal order — Whether fact that treaty binding at international level relevant — The law of Belgium