The XMLEXISTS is a Boolean function that takes an XPath expression as input and returns FALSE if the XPath expression returns an empty sequence and TRUE otherwise.

XMLEXISTS是一个Boolean函数，它接受一个XPath表达式作为输入；如果这个XPath表达式返回空序列，它会返回FALSE，否则返回TRUE。

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The result returns a Boolean object with value false if the computation is not complete; otherwise, it returns an instance of class object, which contains the result.

如果计算没有完成，结果返回一个值为false的Boolean对象；否则，将返回object类的一个实例，其中包含了计算结果。

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The result returns a Boolean object with value false if the computation is not complete; otherwise, it returns an instance of class object, which contains the result.

如果计算没有完成，结果返回一个值为false的Boolean对象；否则，将返回object类的一个实例，其中包含了计算结果。

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