Another rule of thumb is that client classes do not belong in a domain package.
另一条经验就是客户机类并不属于一个域包。
A domain package is a set of classes that collaborate among themselves to support a cohesive set of contracts that can be considered black boxes.
一个域包是一个互相协作以支持可以被认为是黑盒的内聚契约集的类集。
The basic idea is that each domain package will offer one or more Web services to other domain packages, applications, and potentially even external systems.
基本思想是每个域包将提供一个或者更多的Web服务给其它域包、应用程序，甚至可能是外部系统。
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