服务请求者往往通过消息调用操作——请求消息和响应——而不是通过使用API和文件格式。
The service requester typically invokes operations by way of messages — a request message and the response — rather than through the use of APIs or file formats.
SAML源站点只将断言返回给接收助诊文件的请求者。
The SAML source site only returns the assertion to the requester to which the artifact was sent.
然后只将助诊文件发送给期望的请求者，在检索到助诊文件后则删除它。
The artifact is sent only to the expected requester and is deleted after it is retrieved.
例如WSDL文件中元素的意义可以通过从服务请求者获取的语义响应中的元素来清楚地说明。
For example, the meaning of the element in the WSDL file can be exposed explicitly in the element in the semantic response retrieved from the service provider.
WSDL文件简单地告诉客户端怎样访问这个服务，但没有告诉服务提供者怎样找到服务请求者。
A WSDL file simply tells a client how to access the services; it has no provisions for the service provider to find out about the service requester.
WSDL文件简单地告诉客户端怎样访问这个服务，但没有告诉服务提供者怎样找到服务请求者。
A WSDL file simply tells a client how to access the services; it has no provisions for the service provider to find out about the service requester.
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