这是因为该查询中的路径表达式仅指向没有名称空间的元素。
This is because the path expression in the query targets only elements that have no namespaces.
这个表达式指定了从根元素到锚的路径。
This expression specifies a path from the root element to our anchor.
您可以添加消息树的新数据类型或元素，以便在表达式中使用。
You have the ability to add new data types or elements of the message tree for use in the expression.
大多数功能都是自说明的，映射标签页允许动态构建(使用表达式构建器)，以使得报表元素的显示值可以动态改变。
While most of these functions are self explanatory, the Map TAB allow dynamic conditions to be built (using the Expression Builder) that dynamically change the display value of a report element.
除了简化元素嵌入，紧凑表达式也提供一种引用和重用策略表达式的方法。
Besides simplifying element nesting, compact expression also provides a way to reference and reuse policy expressions.
表2展示了定位元素的DOM表达式。
这个正则表达式在元素中指定。
表达式的重要元素是变量。
样式表将首先使用正则表达式 /*匹配所传递的文档的根元素。
The stylesheet starts by matching the root element of the document that it is passed, using the regular expression /*.
第二个表达式是为分隔元素而添加的运算符。
The second expression is the separator that will be added to separate the elements.
这是组成FLWOR表达式的元素。
它将迭代id x序列中的每个元素，求得表达式的值，并将结果添加到这个返回序列。
It will iterate over each element of the idx sequence, evaluate the expression, and add the result to the return sequence.
您可以配置FanOut中介原语，以仅触发其输出末端一次，或对使用指定XPath表达式获取的每个元素都触发一次。
You can configure the Fan Out mediation primitive to fire its output terminal just once or once for each element obtained using a specified XPath expression.
如果支持BC特性，可以设置version 1.0让它在表达式求值的元素中生效，这样就不用担心类型匹配问题了。
If the BC feature is available, you can set version 1.0 to be in effect for an element with expression evaluation, eliminating worry about type mismatches.
可以使用XPath表达式直接从输出数据元素访问这些部分的名称。
The names of these parts can be accessed directly from the output data element using XPath expressions.
表1展示了定位元素的Xpath表达式。
可以使用XPath表达式直接从输入数据元素访问这些部分的值。
The values of these parts can be accessed directly from the input data element using XPath expressions.
清单6中的代码创建了一个到达所需元素的XQuery表达式。
The code in Listing 6 creates an XQuery expression that reaches out to the required element.
清单9所示的第一个示例表达式是引用version元素最具体的方式，也是最好的方式。
The first example expression shown in Listing 9 is the most specific and the best way of referring to the version element.
X Forms表单元素使用的数据模型引用实际上是XPath表达式，因此可用XPath表达式来引用模型中的任何元素。
The data model references used by the XForms form elements are actually XPath expressions, so you can use them to refer to any element in the model.
至少应该填写您的扩展元素的XPath表达式。
At a minimum, you should fill in the XPath expressions for your extension elements.
不过在前进之前要认识到XPath表达式可能返回多个元素。
However, before you get too far you should realize that an XPath expression can return more than one element.
因此，表达式 /customerinfo/phone代表包含两个元素的序列。
Therefore, the expression /customerinfo/phone represents a sequence of two elements.
XMLEXISTS谓词判断一个XQuery表达式是否返回一个元素序列。
The XMLEXISTS predicate determines whether an XQuery expression returns a sequence of one or more elements.
要完成整个路径位置表达式的求值，所有元素都必须步进，并匹配第一次出现的子元素named-USPrice。
To complete the evaluation of the entire path location expression, each of these elements will be stepped into and the first occurrence of an expected child element named - USPrice matched on.
这意味着：XSL处理器查找与
That means the XSL processor looks for XML elements that match the expression defined by the "select" attribute of
比如选择body元素可使用XPath表达式body。
For example, to select the body element, you just use the XPath expression body.
Map和grep对列表的每个元素计算块或表达式。
Map and grep evaluate a block or an expression for each element of a list.
但是，实践证明对于很长的正则表达式这样太复杂了（很难确定group元素与正则表达式的关系）。
However, this proved too complex with long regexes (it was difficult to decide how the group elements related to the regex).
这个表达式选择元素的子元素之间的所有文本节点。
This expression selects all text nodes between the children of the element.
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