第二个属性s2指定强度级别，这决定在字符串排序或比较时是否考虑大小写或重音符号。
The second attribute S2 specifies the strength level which determines whether case or accent is taken into account when ordering or comparing strings.
改变订阅级别而不影响消息中交换的令牌符号。
Changes in the subscription level can be made without impacting the token that is exchanged in the message.
令牌符号携带请求者的身份验证，提供者管理订阅级别。
The token carries the requestor's identity; the provider manages the subscription level.
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