Principal由协议、域名以及端口三部分组成，在进程级别不同的组合之间互相隔离，它是整个系统的关键部分。
Key to system is the idea of a "principal", which in this case is the triple of protocol, domain-name, and port. Each combination is isolated from any other combination at the process level.
除了分开关注之外，将WSDL端口类型与两个文件之中的WSDL绑定隔离开来，支持给定端口类型下任意数量的绑定。
Besides the separation of concerns, that separation of WSDL port type from the WSDL binding in two documents allows for any number of bindings for a given port type.
所有的客户之间的交互都是通过这个端口进行的，因此将客户与构件可能与其他服务客户或者提供商之间的交互隔离开来。
All customer interaction is through this port, thereby separating customer clients from interactions that the component might have with other service consumers or providers.
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