表示具有单个返回序列的映射函数的结果。

Represents the results of mapped functions or queries with variable return sequences.

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在很大程度上，一个XQuery函数的返回序列只取决于调用该函数时使用的参数。

To a large degree, the return sequence of an XQuery function depends exclusively on the parameters with which you call it.

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它将迭代id x序列中的每个元素，求得表达式的值，并将结果添加到这个返回序列。

It will iterate over each element of the idx sequence, evaluate the expression, and add the result to the return sequence.

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