International organizations — International Tin Council — Rules of procedure — Requirement that Member States keep information pertaining to buffer stock operations confidential — Whether rules binding on delegates of Member States — Cessation of buffer stock operations — Whether rules of procedure concerning confidentiality still binding on Member States and their delegates

Economics, trade and finance — International commodity markets — Tin — International Tin Council — Buffer stock price stabilization programme — Requirement that Member States keep information regarding programme confidential — Cessation of programme — Whether Member States still prohibited from divulging information regarding programme

Relationship of international law and municipal law — Treaties — Binding nature of treaty obligations — Effect in municipal law — Sixth International Tin Agreement, 1982 — Rules of procedure promulgated pursuant to provisions of Tin Agreement — Rules governing functions of International Tin Council — Requirement that Member States keep information pertaining to Council’s buffer stock operations confidential — Cessation by Council of buffer stock operations — Subsequent action against Member State seeking information concerning buffer stock operations — Whether rules of procedure still binding on Member States — Significance of disclosure of information on States’ foreign relations — Whether foreign relations considerations taking precedence over need to disclose information in civil proceedings — The law of the Netherlands