The first paragraph of guideline 4.1.1 sets forth the specific rule that applies to the establishment of reservations expressly authorized by the treaty, while the second recalls article 20, paragraph 1, of the 1986 Vienna Convention.
221.　准则4.1.1第1段确定适用于条约明示准许的保留成立的特定规则，第2段则重申1986年维也纳公约第20条第1款。