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”。
2
In fact, all expressions in XPath 2.0 and instructions in XSLT 2.0 evaluate to sequences, so that a single node or a single atomic value is really a sequence containing that one item.