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。
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And I'm sure you can imagine that if you want to label onw protein green and one red and one yellow, now you can start looking at really complex biological processes.
You can also add attributes when you extend a type, as in Listing 11, where the ParaType complex type definition is extended to add an attribute for label=.