为什么要表达元素之间的父子关系呢？
通过部首或语义元素的组合，单个复合词可以表达复杂的概念关系，通常具有抽象的普遍性。
By the combination of radicals or semantic elements, single compound words can express complex conceptual relations, often of an abstract universal character.
在这个地址记录示例中，简单结构和复杂结构都只使用元素来表达；可以使用属性来改进和增强这个结构—例如，通过排序键。
In the address record example, both the simple and complex structures were expressed using only elements; you can refine and enhance the structure-with sort keys, for instance-using attributes.
注解是表达程序元素固有特性的最佳选择。
Annotations are best for expressing the inherent characteristics of a program element.
表达式——仅检查返回表达式结果的树内容(元素值)。
Expression — Only examines tree content (element values) returning the result of the expression.
这就是本例在通讯中使用关键词ref来表达对引用元素映射应该已经存在而无须再建立一个映射的含义。
That is why this example USES the ref keyword in the correspondence, to express that a mapping should already exist for the referenced element and there is no need to create another one.
W3CXMLSchema真正出色的地方是在表达属性值和元素内容的类型约束上。
The place where W3C XML Schemas really shine is in expressing type constraints on attribute values and element contents.
通过在模式注释中表达，snowboard元素被附加到同名的抽象概念中。
The snowboard element is attached to the abstract concept of the same name through expression within the schema annotation.
通过创建新的链接关系，可以扩展link元素所能表达的联系类型。
By creating new link relations, you can extend the types of relationships that the link element is capable of expressing.
RDFa是一种标准约定，可用于将结构化的元数据表达为HTML元素内的rdf语句。
RDFa is a standard convention for expressing structured metadata as RDF statements within HTML elements.
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.
该表达式选择所有的元素，然后返回第一个元素。
The expression selects all the elements, then returns the first one.
在编辑判决元素的条件表达式时，该操作是必须的。
This is needed to edit the condition expressions for the decision elements.
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.
实现模型层级处理设计模型层级中被表达的元素如何在现实世界中被创建。
The Implementation Model Level addresses how elements expressed in the design model level will be created in the real world.
但通常不这样做，传入DOM文档元素，然后从这里开始编写表达式是最简单的办法。
More often than not, though, it's easiest to pass in the DOM document element and write your expressions from there.
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。
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.
架构的重要性还可以以经济的重要性来表达，因为某些元素的主要驱动者是创建的成本和变更的成本。
Architectural significance can also be phrased as economical significance, since the primary driver for considering certain elements over others is the cost of creation and cost of change.
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 /*.
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.
属性用于表示元素所表达信息的简单性质。
Attributes are designed for expressing simple properties of the information represented in an element.
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.
不管使用哪个名称，它们都匹配基于它们的代替组head元素的路径表达式。
Whatever names they use, they all match the path expression based on their substitution group head element.
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.
with - syntax额外定义了一些语法元素，可以在转换表达式中使用。
With-syntax defines additional syntax elements that can be used in the transforming expression.
with - syntax额外定义了一些语法元素，可以在转换表达式中使用。
With-syntax defines additional syntax elements that can be used in the transforming expression.
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