connected component label 连通区域标识
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。
Tree security label component: a tree is a collection of elements representing a complex hierarchy having multiple nodes and branches.
树安全标签组件：树是一个元素集合，用于表示有多个节点和分支的复杂层次关系。
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。
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