Service: The component that executes the requested service
服务：执行所请求的服务的组件
CAS checks that the supplied ticket is valid and is associated with the requested service.
CAS检查这个ticket是否有效，以及是否与请求的服务相关联。
At the same time, rather complex data-processing operations need to be performed in order to provide the requested service.
同时，为了提供所请求的服务，需要执行相当复杂的数据处理操作。
Step 3: the DataPower appliance checks if the user is allowed to call the requested service by evaluating the access control policy written in XACML.
步骤3：DataPower设备通过计算用XACML编写的访问控制策略，检查是否允许用户调用所请求的服务。
When the sp receives the service request, it will process the request XML document to identify the requested service then process the corresponding requests and reply to the requester.
SP接收到服务请求时，它将处理请求XML文档，以标识所请求的服务，然后处理相应的请求并返回给请求程序。
The requested service is temporarily unavailable. It is either overloaded or under maintenance. Please try later.
所请求的服务暂时无法使用。它要么是超载或正在维修。请稍后再试。
The net effect is that a service constructor either returns a non-null instance of the requested service, or throws an exception;
实际结果是服务构造函数或者返回所请求服务的非空实例，或者抛出异常；
The capabilities of candidate service providers are evaluated at run-time and the best provider is selected to deliver the requested service based on business context and data semantics.A
对候选服务提供者功能的评估在运行时进行，并选择最佳的提供者以基于业务上下文和数据语义交付所请求的服务。
The capabilities of candidate service providers are evaluated at run-time and the best provider is selected to deliver the requested service based on business context and data semantics.A
对候选服务提供者功能的评估在运行时进行，并选择最佳的提供者以基于业务上下文和数据语义交付所请求的服务。
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