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.
文本消息必须符合的模式是通过初始化文件中的元素中定义的正则表达式定义的。
The pattern that the text message must correspond to is defined through a regular expression defined through the element in the initialization file.
我们可以使用这些表达式快速转换当前的消息、构造新的消息以及进行基于内容的路由。
These expressions can be used to quickly transform the current message, construct new messages and do content based routing.
和主题选择一样，消息选择标准表达式使用sql样式的语法定义，该语法必须求解出一个布尔值。
Like topic selection, message selection criteria expressions are defined using a SQL-like syntax, which must resolve to a Boolean value.
正则表达式捕获每个属性的值并将其放置到此前用于存放来自TMC2消息的字段的哈希中。
The regular expression captures the value of each attribute and places these in the same hash you used to hold the fields from the TMC2 message earlier.
我寻找构成所寻找模式的正则表达式，然后使用注入的特殊消息来打印该磁盘报告行。
I look for a regular expression that makes the pattern I am looking for, and then print the line of the disk report with a special message that gets injected.
这些表达式用于指示输出消息组件中的目标元素，其中获取的元素应该重写现有值(假如树中已经存在元素)。
These are used to indicate a target element in the out going message assembly, where an acquired value should overwrite the existing value (in the case where the element already exists in the tree).
错误消息中显示的原因码 “XUTY0008” 表示 “替换表达式的目标节点不是单一节点”。
The reason code "XUTY0008" shown in the error message quickly points you to the fact that "the target node of a replace expression is not a single node".
任务输出消息也可以通过XPath表达式进行访问。
The task output message can be accessed via XPath expressions as well.
例如，可以配置一个MessageFilter中介原语，以根据某个特定XPath表达式的值(是否为真)来按多种路径之一传递消息。
For example, you can configure a message Filter mediation primitive to route messages down one of multiple paths, depending on whether a particular XPath expression holds true.
可选地，后面还可以跟着一个前缀为反斜杠的XPath表达式，以仅访问该消息部分的特定元素。
Optionally, there can follow an XPath expression prefixed by a backslash, to access only a specific element of the message part.
可选地，后面还可以跟着一个前缀为反斜杠的XPath表达式，以仅访问该消息部分的特定元素。
Optionally, there can follow an XPath expression prefixed by a backslash to access only a specific element of the message part.
此外，还可以后跟一个XPath表达式，仅访问消息（部分）的特定元素。
Optionally, there can follow an XPath expression to access only a specific element of the message (part).
从输入或输出消息获得的任何数据元素都可以通过使用XPath表达式进行引用。
Any data elements obtained from an input or output message can be referenced by an XPath expression.
如果相同中介流处理多种消息类型，您可以使用此新原语定义XPath表达式，以将消息指引到不同的终端。
If multiple message types are processed by the same mediation flow, you can use this new primitive to define XPath expressions to direct messages out different terminals.
此例中显示了两种类型的用户属性：静态字符串，以及从入站消息中取得其值的XPath表达式。
In this example, two types of user property are shown: a static string, and an XPath expression that takes its value from the inbound message.
DatabaseRetrieve节点可用于修改消息，方法是使用从数据库中获得的信息并通过在处理节点中指定XPath表达式。
The DatabaseRetrieve node can be used to modify a message using information that is obtained from a database by specifying an XPath expression in the processing node.
例如，在前面的表达式中，把两个整数数据项(“Retailertypecode”和“Retailer code”)放在一起，错误消息就会消失了。
For example, in the previous expression, by putting both integer data items together (" Retailer type code "and" Retailer code "), the error message disappears.
DatabaseRoute节点可用于路由消息，方法是结合使用数据库中的信息和XPath表达式。
The DatabaseRoute node can be used to route messages using information from a database in conjunction with XPath expressions.
如清单7所示，添加XPath表达式到异常消息将产生更详细的对验证失败的描述，这样大大方便了发现问题。
Adding XPath expressions to the exception message, as shown in Listing 7, results in a more detailed description of the validation failure, which greatly simplifies locating the problem.
也就是说，MessageBroker中的新节点能够接受节点应用的路由决策中使用的表达式，也能够用作消息传输处理活动的一部分。
That is, new nodes in message Broker are capable of accepting expressions used in the routing decisions applied by nodes or used as part of their message transformation processing activities.
任务输入消息可以通过XPath表达式进行访问
The task input message can be accessed via XPath expressions
流程输入消息可以通过XPath表达式进行访问。
The process input message can be accessed via XPath expressions.
在CompatibleQueryMode中，对切片器表达式进行验证将导致以下警告消息。
In Compatible Query Mode, validation of the slicer expression would result in the following warning message.
我还会使用Groovy的正则表达式(在感受Groovy中介绍)来确定传递给facade的消息。
I'll also be using Groovy's regular expressions (introduced in Feeling Groovy) to determine the messages passed to the facade.
消息映射的键是字符串，表示用于访问业务对象的叶子节点的XPath表达式。
The keys of the message map are strings that represent XPath expressions to access the leaf nodes of the business object.
需要对XML元素指定条件XPath表达式来详细描述对警告消息的验证。
A conditional XPath expression needs to be specified on the XML element to specify the validation for the Warning message.
不过，请记住，使用XPath表达式还可以仅加密xml消息的服务数据对象的某一部分。
However, keep in mind that using XPath expressions also makes it possible to just encrypt some part of a service data object of an XML message.
在DynamicQueryMode中使用dmr包时，如果报告包含的表达式带有特定于供应商的关系函数，那么执行报告将会生成以下的错误消息。
When using a DMR package in Dynamic Query Mode, a report that contains an expression with any vendor specific relational function will produce an error message similar to the following.
对要识别的消息，SpamAssassin(及其它类似工具)评估了大量的模式—大多数是正则表达式。
SpamAssassin (and similar tools) evaluate a large number of patterns — mostly regular expressions — against a candidate message.
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