The update is then made with a conditional expression to only update if this field is the same as when the data was read.
然后，用条件表达式进行的更新只会在该字段就是数据被读出的那个字段进行。
If a FunctionName in a FunctionCall expression is not an NCName (i.e. if it contains a colon), then it is treated as a call to an extension function.
如果FunctionCall表达式中的FunctionName不是NCName(也就是说，如果它包含了一个冒号)，那么就将它当作是对扩展函数的调用。
If the repeating element option is selected, then an XPath expression must be provided.
如果选择了重复元素(repeating element)选项，则必须提供XPath表达式。
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