Set security label component: a set is an unordered list of elements.
集合安全标签组件：集合是一组无序的元素。
A security label component is a new database entity that can be created, dropped, and altered.
安全标签组件是一个新的数据库实体，可以被创建、删除和修改。
Array security label component: an array is an ordered list of elements that can be used to represent a simple hierarchy.
数组安全标签组件：数组是一组有序的元素，可用于表示简单的层次结构。
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