这是因为回退机制只能用于指令元素而不能用于声明。
That is because the fallback mechanism only works for instruction elements, not declarations.
关于XSLT中的“指令”和“声明”元素请参阅结构表和后面的说明。
See the structure table and the following remarks for details about "instruction" and "declaration" elements in XSLT.
在两个版本的XSLT中第2层的元素都称为指令。
The elements at level 2 are called instructions in both versions of XSLT.
消息泵解析xml指令，并设置输入页面中的元素。
The message pump parses the XML instructions and sets the elements in the input page.
这意味着满足条件的与不满足条件的向量元素执行的指令集不同。
This means that vector elements which match the criteria go through a different set of instructions than those that do not.
因此可以编写精确的表达式来表示元素和元素值，以及属性、处理指令等等。
So you can write concise expressions that consider not only elements and element values, but also attributes, processing instructions, and so on.
root - level模板的工作原理与散点图示例中的工作原理相同，它将呈现元素的指令，然后调用showpage以呈现图形缓冲的内容。
The root-level template works the same as that in the scatter plot example, rendering instructions for the elements and then calling showpage to render the contents of the graphics buffer.
因此，xsl:fallback元素应该包含替换包含它的单一指令所需要的全部内容。
Therefore, the xsl:fallback element should contain whatever is needed to substitute for the single instruction that contains it.
该指令接受一个称为select 的属性和您感兴趣的RSS或Atom元素的路径。
The instruction takes one attribute called select with a path to the RSS or Atom element that you're interested in.
注意，只有当元素被执行的指令所选中时才会被处理。
Note that elements are only processed when they have been selected by the execution of an instruction.
可以通过组件和指令来扩展模板中的HTML词汇。它们看上去就是新元素和属性。
We can extend the HTML vocabulary of our templates with components and directives that appear as new elements and attributes.
从当前位置开始，将指令指针向前移动指定的元素个数。
Moves the instruction pointer forward by the specified number of elements, starting at the current position.
Angular执行这个表达式，并把它赋值给绑定目标的属性，这个绑定目标可能是HTML元素、组件或指令。
Angular executes the expression and assigns it to a property of a binding target; the target might be an HTML element, a component, or a directive.
从列表的第一个元素获取数据的函数称为car(这个名字是古老的汇编语言指令的延续)。
The function to retrieve the data from the first element of a list is called car (a name which is a holdover from an ancient assembly language instruction).
该元素可包含文本、空白、有效空白、cdata节、注释和处理指令。
The element can contain text, white space, significant white space, CDATA sections, comments and processing instructions.
可以使用“rename”操作给元素、属性或处理指令节点指定一个新名称。
You can use the "rename" operation to give an element, attribute, or a processing-instruction node a different name.
这两条指令对自己的两个操作数逐元素进行比较。
These instructions perform element-by-element comparisons of their two operands.
该方法在解析只含元素的内容时很有用，如果在发现标记之前遇到非空白文本(不包括注释或处理指令)，就会抛出异常。
This method is useful when parsing element-only content; if it encounters non-white-space text before a tag is found (other than comments or processing instructions), it throws an exception.
注意，有些讨论也与把文本、注释和处理指令当作兄弟元素的情形有关，但是本文仅讨论元素。
Notice that some of the discussion will also be pertinent to cases where you have text, comments, and processing instructions as siblings of elements, but this discussion focuses solely on elements.
结构表(表2)的最后一行列出了那些作为特定指令或声明元素的附加成分出现的元素。
The last row of the structure table (table 2) lists those elements that occur as subsidiaries to particular instruction or declaration elements.
本文使用指令、声明或扩展元素等术语对样式表元素和属性作更精确地分类。
This article USES terms such as instructions, declarations, and extension elements to classify the elements and attributes of a stylesheet more precisely.
节点可以是一段文本(比如元素的内容)、一个元素、一条处理指令或者注释。
A node can be a piece of text (such as an element's content), an element, or a processing instruction or comment.
第2层也会出现文字结果元素(LRE)，这些元素将被复制到结果中而不是作为处理程序指令。
Level 2 is also where Literal result elements (LREs) occur, which are elements that are to be replicated in the result rather than serving as instructions to the processor.
当指定ELEMENT指令检索以元素为中心的XML时，如果列具有NULL值，则EXPLICIT模式将不生成相应的元素。
When you specify the element directive to retrieve element-centric XML, if the column has a NULL value, the corresponding element is not generated by the EXPLICIT mode.
把处理器设置成将来自一个或两个特定名称空间的元素当作指令。
The processor is set up to consider elements from a particular namespace (or two) to be the instructions.
然而，问题是向量处理会假设每条指令都可以适用于向量的所有元素。
However, the problem is that vector processing assumes that each and every instruction will be applied to all elements of the vector.
order属性的用途与Apache的order指令相同：它确定缺省行为和计算allow和deny元素的顺序。
The order attribute serves the same purpose as Apache's order directive: it establishes the default behavior and the order in which allow and deny elements are evaluated.
从本质上说，浏览器将每个元素和属性(在许多情况下，还包括元素的组合)解释为一个指令，并根据这个指令显示某些输出或执行某一动作。
In essence, the browser interprets each element and attribute (and in many cases aggregates of elements) as an instruction to render some output or perform some action.
当用户把鼠标移到DOM元素上时，指令将该元素的背景设置为一个高亮颜色。
The directive sets the background to a highlight color when the user mouses over the DOM element to which it is applied.
扩展指令可以支持标准属性或者允许将XSLT指令作为子元素，由实现处理程序的厂商决定。
Extension instructions can support the standard attributes or allow XSLT instructions as children, at the discretion of the vendor implementing the processor.
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