服务提供者节点能代表商业实体的服务，或者它甚至能代表可重用的子系统的服务接口。
A service provider node can represent the services of a business entity or it can simply represent the service interface for a reusable subsystem.
这种方式的优点在于它代表了一个投资者实实在在可以购买的市场。
The virtue of such an approach is that it represents the market that an investor can actually buy.
它代表了访问资源的发起者，并为JAAS框架中的访问控制决策建立了基础。
It represents the originator of access to resources and forms the basis for access control decisions in the JAAS framework.
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