为了使持续时间可比较，XML Schema 1.1 引入了两个新的全序类型，分别是：yearMonthDuration 和 dayTimeDuration，这两种类型由对 duration 的限制派生而来。
To allow durations to be comparable, XML Schema 1.1 introduced two new totally ordered datatypes, namely: yearMonthDuration and dayTimeDuration, derived by restriction from duration.
MA主要由移动组的组成员管理协议和移动组的全序可靠多播协议组成。
MGC-MA mainly consists of a mobile group membership management protocol and a mobile group totally ordered reliable multicast protocol.
该文提出一个高效的全序有向传递签名方案，并证明该方案在选择明文攻击下是安全的。
In this paper, an efficient total ordering directed transitive signature scheme is proposed and its security against adaptive chosen-message attack is proved.
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