empty sequence的意思|示意

Specifies that the expression can not be matched against empty sequence.

指明表达式不能匹配空序列.

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If the argument is an empty sequence, fn: string (seq) will return a zero-length string, but the other function returns an empty sequence.

如果参数是空序列，fn： string (seq)将返回长度为零的字符串，另一个函数则返回空白序列。

If the specified XPath returns an empty sequence, XMLEXISTS returns false.

如果指定的XPath返回一个空序列，那么XMLEXISTS返回false。

The value produced by that XQuery is either the customer's name element if the predicate is true, or the empty sequence otherwise.

那个XQuery产生的值，当谓词为true时为客户的name元素，否则为空的序列。