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。
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。
This is because, for a given row, the XMLEXISTS predicate evaluates to false only if the XQuery expression inside returns the empty sequence.
这是因为，对于一个给定的行，只有当里面的XQuery表达式返回空序列时，XMLEXISTS谓词才为false。
However, without the square brackets the XQuery expression is a Boolean expression which always returns a Boolean value and never the empty sequence.
然而，如果不使用方括号，XQuery表达式就是一个总是返回boolean值的Boolean表达式，而不会返回空序列。
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。
To fix this, you must declare an XML element containing an empty sequence and add a part to the message with this element. Listing 3 demonstrates how such an XML element can be declared.
为了纠正这个错误，必须声明一个包含空序列的xml元素，并用这个元素将一个部分添加到消息中。
In this case the starting value is returned for an empty sequence, and the function is first applied to the starting value and the first sequence item, then to the result and the next item, and so on.
如果序列是空的，就返回初始值，否则函数会先接收初始值和序列的第一个元素，然后是返回值和下一个元素，依此类推。
Also, the empty and exists functions, each returning a Boolean value, quickly tell you whether a sequence has members.
另外，empty和exists函数返回的布尔值可以帮助迅速判定序列是否有成员。
It has an empty content model because of its empty xs: sequence element.
它有一个空的内容模型，因为它的xs：sequence元素为空。
For each row in the table which doesn't match the predicate, a row containing an empty XML sequence is returned.
对于表中与谓词不匹配的每一行，返回一个包含空的xml序列的行。
The connection of the two bodies is built around a sequence of full and empty, with a courtyard and an elevator handled as transparent box, as the centerpiece of the joint.
这两个体量之间的联系是围绕着满与空的序列建造的，一个院落和一个透明盒子式的电梯作为这个节点的中央装饰品。
It then builds a new regular expression in indent_pat that matches exactly the same sequence of whitespace at the start of any non-empty line (hence the trailing '\ s').
随后在indent _ pat中构建一个新的正则表达式，精确匹配任何非空行的起始处的相同序列的空白(即拖尾' \S ')。
Each end with nothing to say just periodically sends an empty data packet with its current sequence, acknowledgement and window Numbers.
每个终端只需间歇地发送一个包含当前序列的空的数据包，确认信息和滑动窗口号就可以了。
Chits can also be used to randomize a certain sequence of events repeatedly by drawing chits from a container until it is empty and then putting all chits back.
复数的图标也可以借由移出容器然后在全部被移出后全部放回来产生特定顺序的事件。
In the case where no correlated elements are found, the sequence of correlated elements for that element is empty.
如果未找到相关元素，则该元素的相关元素序列为空。
Returns an empty string if the character sequence is not a valid collating element.
如果字符序列不是有效的对照元素则返回空字符串。
The purpose of this sequence is to quickly empty the reactor.
该程序的目的是快速倒空反应器。
Returns the only element of a sequence, or a default value if the sequence is empty;
返回序列中的唯一元素；如果该序列为空，则返回默认值；
Returns the only element of a sequence, or a default value if the sequence is empty;
返回序列中的唯一元素；如果该序列为空，则返回默认值；
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