由于服务提供者能够通过请求其他服务来完成自己的工作，在设计上就可以使用服务的分层结构。
Since a service provider can do its work by requesting other services, you can use a layered composition of services for your design.
该安全框架采用了分层的结构：安全服务接口层、安全服务层、安全提供者接口层和安全提供者层。
The security framework is made up of four layers: security service interface, security service, security service provider interface and security provider.
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