The International Classification treaties (i. E. The Locarno, Nice, Strasbourg and Vienna Agreements) established permanent Committees of Experts with a mandate periodically to revise and update the classification systems.

• 各项国际分类条约(即《洛迦诺协定》、《尼斯协定》、《斯特拉斯堡协定》和《维也纳协定》)均成立了常设性专家委员会,任务是定期修订和更新各分类体系。