陆相层序受自然地理景观、影响地层发育的地质营力及地层类型等因素影响，因此层序类型多种多样。

The continental sequence deeply affected by natural geographic districts, geological forces and strata types, therefore occurred some kinds of types.

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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.

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XML Schema 1.0 Datatypes Recommendation（参见 参考资料）中指定的 duration 数据类型是一个半序类型（partially ordered type），表示一个时间段。

The duration datatype specified in the XML Schema 1.0 Datatypes Recommendation (see Resources) is a partially ordered type that represents a period of time.

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