从一集合中选择给定数量的不同元素而不管被选元素在集合中的排列次序。
A given number of different elements selected from a set without regard to the order in which the selected elements are arranged.
在集合中,元素出现的顺序不重要。
In a set, the order in which the elements appear is not important.
在清单6中,我创建了一个简单的模板,它表示一个定义person元素集合的XML文档。
In Listing 6, I've created a simple template that represents an XML document defining a collection of person elements.
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