The input value can be a simple expression or be a value computed by another node.
该输入值可以是一个简单表达式，或者是由另一节点计算的一个值。
An XML "value," computed by a query expression, may consist of zero, one, or many items, each of which may be an element, an attribute, or a primitive value.
由查询表达式计算出来的XML“值”，可为零项、一项或者多项，而其中每一项可以是一个元素、一个属性或一个原始值。
The expression is then computed and the resulting value replaces the existing value in the target node.
然后，计算表达式，得到的值将替换目标节点中的现有值。
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