This element describes the collection of pages to be secured and associated security constraints.

该元素描述要保护的页面集合和关联的安全约束。

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Finally, an abstract process may be used to easily specify constraints on the usage patterns of a collection of port types.

最后，抽象流程可用来容易地指定对一组端口类型的使用形式的约束。

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This mechanism has the benefit of limiting repeated conditionals testing for certain constraints, such as collection sizes or the previously discussed not-null condition.

这种机制具有限制针对特定约束条件的重复条件测试的好处，如集合大小或之前讨论过的非null的情况。

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