如果结果为真，那么将在触发器语句中根据EMPLOYEE模式验证INFO文档。
If it is true, then the INFO document gets validated against the EMPLOYEE schema in the trigger statement.
如果还没有验证文档，将执行触发器语句的操作部分，并根据指定的模式验证XML文档。
If the document is not validated, then it executes the action part of trigger statement and validates the XML document according to the specified schema.
触发器语句的操作部分包含xmlvalidate函数，它根据指定的模式验证XML文档。
The action part of the trigger statement includes the XMLVALIDATE function to validate the XML documents against the XML schema specified.
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