Use a global document variable against which XPath expressions are evaluated, and create a function to which you can pass an expression.

使用一个全局文档变量来定义进行判断的XPath表达式，并创建一个接收表达式的函数。

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In this final step, you create a view and function on top of the CUSTOMER_INFO table.

在最后一步中，您在customer_info表的基础上创建了一个视图和函数。

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