The reason code "XUTY0008" shown in the error message quickly points you to the fact that "the target node of a replace expression is not a single node".
错误消息中显示的原因码 “XUTY0008” 表示 “替换表达式的目标节点不是单一节点”。
If the evaluation of the test expression is true and does not result in a dynamic or type error, the element is considered locally valid.
如果测试表达式的计算结果为true并且没有导致动态的或类型错误，那么则认为元素在逻辑上是有效的。
A detailed expression check can determine the precise type and location of an error. There are seven categories of error checking
详细的表达式检查能够确定错误确切的类型和位置。
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