node-set maps to an org.w3c.dom.NodeList
node-set映射为 org.w3c.dom.NodeList
Using extension functions (other than node-set).
使用扩展函数(节点集除外)。
It's easy to forget the root, but if you do, the XPath returns an empty node-set.
很容易忘记根元素，如果您确实忘记了，那么XPath会返回空的节点集。
It's also necessary to specify the return type. Here I ask for a node-set back.
还必须指定返回类型。
However, that means you have to rely on the node-set extension function to add the values.
但是这样就只能使用node - set扩展函数把这些值加起来。
Set: intersection computes the intersection if two sets, returning a node-set whose nodes are in both.
如果返回的节点集中的节点在两个集合中都有，则set：intersection将计算交集。
Exsl: node-set allows you to turn result tree fragments into node-sets so that you can apply XPath on them.
node - set允许您将结果树片段转换为节点集，这样便可以对其应用XPath。
Using the node-set extension function to convert a Result Tree Fragment (RTF) to be navigable and filterable.
使用node - set扩展函数使结果树片段(rtf)能够导航和筛选。
The variable $values is neither a node-set nor an IDN; it is just a sequence of atomic double-precision numbers.
变量 $values既不是节点集也不是IDN，仅仅是一个原子性的双精度数序列。
For example if the node-set is used in a Boolean context, the only processing needed is to test whether it is empty.
例如，如果该节点集在布尔型上下文中使用，唯一需要的处理就是测试它是否是空的。
For completeness, document also accepts a node-set as a parameter, in which case the function assumes each node is a URI.
为完整起见，document还接受节点集作为参数，在这种情形下，该函数认为每个节点都是一个URI。
Using an RTF forces you to use the node-set extension function to access the individual values stored in the fragment.
RTF还必须用node - set扩展函数访问存储在片断中的每个值。
set:trailing returns the nodes in one node-set that come after the first node in the other node-set, in document order.
trailing将返回一个节点集，其中的节点按照文档顺序要比另一个节点集中的第一个节点晚出现。
When an intensional node-set is used for the third time, it is stored extensionally, trading memory for processing time.
当第三次使用内包节点集时，将在扩展存储它，以内存换取处理时间。
Set: leading returns the nodes in one node-set that come before the first node in the other node-set, in document order.
leading将返回一个节点集，其中的节点按照文档顺序要比另一个节点集中的第一个节点早出现。
XPath 1.0 provided you with the sum function as a convenient means to add the numeric values of the nodes in a node-set.
XPath 1.0提供了sum函数，用于将节点集中的数字值相加。
BC mode allows certain automatic type conversions to occur, as well as automatic selection of the first member of a node-set.
BC模式允许进行某些自动类型转换和自动选择节点集的第一个成员。
You might prefer to sort the original node-set, store the sorted nodes in a variable, and select the first ten members of the sorted set.
也许您更愿意对原来的节点集排序，将排序后的节点存储到变量中，然后选择前十个成员。
set:difference computes the difference between two sets, returning a node-set whose nodes are in one of the arguments but not the other.
difference 将计算两个集合之间的差异，返回一个节点集，该节点集的节点位于其中一个实参，而不在其他实参中。
You might copy the nodes in sorted order into a result tree fragment, but then your stylesheet must rely on the node-set extension function.
也可将排序的节点复制到结果树片断中，但这样就不得不使用node - set扩展函数。
Vendor-provided extension functions should always be reported as available in that vendor's processor (the node-set function for 1.0 is an example).
在厂商提供的处理程序中，厂商定义的扩展函数应该总是可用的(1.0中的node - set函数就是一个例子)。
For example, when the actual value or the expression is a node-set, the final Boolean result is known as soon as a single member of the node-set is found.
例如，当实际值或表达式是一个节点集时，一旦找到节点集的一个成员时，就可以立即知道最终的布尔值结果。
Most providers of an XSLT processor added an extension function, usually called node-set , which allows the RTF to become a navigable and filterable tree.
多数XSLT处理程序的提供商都增加了一个扩展函数，通常称为node - set，它可以把RTF变成可导航、可筛选的树。
It can also save time, if it turns out (as it often does) that the only thing done with the node-set is to test whether it is empty, or to get the value of its first element.
它还可以节省时间，如果对于节点集的唯一操作就是测试它是否是空的(通常是这种情况)，或者对它的第一个元素进行赋值。
In this case, a node set is used when a string is intended, usually with results that are hard to debug.
这种情况下，在打算使用字符串时却使用节点集，这通常导致调试非常困难。
The function parses the document and returns a node set.
该函数解析文档，然后返回节点集。
Remember, a predicate applies to the node set to the left of the predicate itself.
要记住，谓词作用于谓词本身左侧的节点集。
A predicate must be applied to a node set, but it can be applied to any node set.
谓词必须作用于节点集，但是可作用于任何节点集。
where: where lets you apply selection criteria to a node set, beyond what XPath offers.
where：where允许向节点集应用选择条件，除了XPath 原有的机制意外。
Finally, and most importantly, this will ignore any filtering or ordering you perform on the node set returned by the for clause.
最后，也是最重要的，该表达式将忽略对for子句返回的节点集所执行的筛选或排序操作。
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