如何：使用自定义表达式对值进行汇总或聚合。
How to: Summarize or Aggregate Values Using Custom Expressions.
无论您正在创建一个BPEL过程，还是一个业务状态机，或者是几种其他类型组件中的任意一种，您都需要定义自定义表达式和行为。
Whether you are creating a BPEL process, a business state machine, or any of several other types of components, you need to define custom expressions and behavior.
CAMStudio模板编辑器支持向生成模板中添加自定义XPath表达式，不过UI可以定义大多数规则，而无需编写自定义表达式。
CAM Studio template editor supports adding custom XPath expressions to its generated templates but the UI can define most rules without writing any custom expressions.
JSF具有用于自定义jsfel表达式中的顶级变量的解析的机制。
JSF has a mechanism for customizing the resolution of top-level variables in JSF el expressions.
推断表达式树内数据，并对它做自定义处理。
Reason about the data in the expression tree, and do custom processing over it.
作为可选项，也有可能支持用户自定义类型，这将极大的简化所要求的表达式。
It may optionally support user defined types, which can greatly simplify the required expressions.
本系列中的文章允许您将正则表达式的功能与grep工具结合使用，创建自定义LDAP搜索功能。
The articles in this series allow you to combine the power of regular expressions with the grep tool to create your own custom LDAP search capability.
他举出了大量的例子告诉你如何巧妙地处理那些表达式树和编译你的带自定义条件的lambda表达式。
He has a great example of how you can manipulate the expression trees and build custom conditions in your lambda expressions.
在Properties窗格的General选项卡上，将 $field[@name='CustomerID']作为自定义XPath表达式添加，如图25 中所示。
On the General tab of the Properties pane, add $field[@name='CustomerID'] as a custom XPath expression as shown in Figure 25.
使用自定义处理程序和正则表达式的内容协商。
Content negotiation using custom handlers and regular expressions.
流程和活动自定义属性通过以下表达式提供对流程或活动实例或模板的自定义属性的访问。
Process and activity custom properties provide access to custom properties of the process or activity instance or template via the following expression.
任务自定义属性通过以下表达式提供对任务自定义属性的访问。
Task custom properties provide access to custom properties of the task via this expression.
升级自定义属性通过以下表达式提供对升级自定义属性的访问。
Escalation custom properties provide access to custom properties of the escalation via the following expression.
节点的自定义是通过创建XPath表达式获得的，该表达式将在运行时调用节点时执行。
The customisation of the nodes is achieved by you creating an XPath expression which will be executed when the node is invoked at runtime.
由于这是自定义转换，因此需要添加自定义XPath表达式。
Because this is a custom transformation, you need to add a custom XPath expression.
该设计具有良好的可扩展性，能对任意自定义规则的表达式进行计算。
The design has a good scalability of the situation, be able to customize the rules of arbitrary expressions calculated.
由于用户已请求编译表达式，编译器使用反射发出将正则表达式编译为自定义扫描仪类。
The compiler compiles the regular expression into a custom scanner class using reflection emit because the user has requested that the expression be compiled.
由于用户已请求编译表达式，编译器使用反射发出将正则表达式编译为自定义扫描仪类。
The compiler compiles the regular expression into a custom scanner class using reflection emit because the user has requested that the expression be compiled.
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