测试证明，如果日期不正确，将显示适当的错误消息。

It verifies that the appropriate error message is displayed if the date is incorrect.

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如果开始日期晚于结束日期，则用户会收到一条错误消息。

If the start date is later than the end date, then the user receives an error message.

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注意：如果没有模式或者使用的XQuery处理程序不知道date属性是日期类型，该语句可能会出现错误。

Note: If you don't use a schema or XQuery processor that knows that the date attribute is a date type, you can get errors with this statement.

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