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。
Note that XMLEXISTS truly checks for the existence of a value and evaluates to true if a value exists, even if that value happens to be the Boolean value "false".
注意,XMLEXISTS只是检查一个值的存在,如果存在一个值,即使这个值碰巧为boolean值“false”,XMLEXISTS也将返回true。
Since XMLEXISTS truly checks for the existence of a value, even the existence of the value "false" satisfies XMLEXISTS so that any document qualifies for the result set.
由于XMLEXISTS实际上是检查值的存在,甚至“false”值的存在也将满足XMLEXISTS,因此任何文档都可以成为结果集。
Since XMLEXISTS truly checks for the existence of a value, even the existence of the value "false" satisfies XMLEXISTS so that any document qualifies for the result set.
由于XMLEXISTS实际上是检查值的存在,甚至“false”值的存在也将满足XMLEXISTS,因此任何文档都可以成为结果集。
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