The flow domain has unbounded horizontal extension. The upper fluid has finite depth, the lower fluid is infinitely deep.
流动区域在水平方向无限伸展，上层流体有限深度，下层流体无限深。
One rule of thumb is that server classes belong in a domain package and will often form their own domain packages because they are the last stop for message flow within an application.
有这样一条经验可以遵循，服务器类属于一个域包并且常常会形成它们自己的域包，因为它们是应用程序里消息流的最后一站。
For instance, when moving a compiled message flow from a test domain to a production domain that contains different queue and data source names, the same compiled message flow can be used.
例如，在将已编译的消息流从测试域移动到包含不同队列和数据源名称的生产域的时候，可以使用相同的已编译消息流。
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