The resulting set of elements is called a node set.
结果元素集称为节点集。
The function parses the document and returns a node set.
该函数解析文档，然后返回节点集。
For: You can use for to take a node set and iterate over it.
for：使用for遍历节点集。
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。
One of the keys to effectively using XPath is to realize that an XPath always evaluates to a node set.
有效使用XPath的一个关键是要认识到XPath始终计算的是节点集。
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。
Set: distinct examines a node set for nodes with the same string value and removes all but one instance of each.
distinct将检验节点集以查找拥有相同字符串值的节点，并且只保留每个节点的一个实例，而将其余都删除。
So the return value (sort of a misnomer, but still a useful way to think about things) for an attribute selector is a value; for an element, it's a node set (containing a single node).
因此对于属性选择器，返回值（虽然不确切但是很有用）是一个值，对于一个元素则是一个节点集（包含一个节点）。
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。
So, for example, <xsl:for-each select="$x+2"> can be instantly recognized as an error because the XPath expression $x+2 can never return a node-set.
因此，例如， <xsl:for-eachselect="$x+2">可以立即识别成一个错误，因为XPath表达式 $x+2永远不会返回节点集。
Finally, you can pass a combination of a string and a node-set as parameters.
最后，您可以将字符串和节点集的组合作为参数来传递。
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。
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。
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。
Perhaps like many other people, you read and re-read the paragraph in part 11.1 that said, "a result tree fragment is treated equivalently to a node-set that contains just a single root node."
也许和其他很多人一样，您曾经反复琢磨11.1节中的这样一段话，“结果树片段被视作相当于只包含一个根节点的节点集。”
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。
An example of such behavior is when a variable that is not of a node-set type is assigned to an expression where a node-set is required.
将不是节点集类型的变数指派至需要节点集的运算式时，即是这类行为的范例。
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。
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。
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。
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