服务请求输出要求：定义服务请求的模板。
Service request input requirements: defines the template for service request.
服务的语义描述的用途在于，可帮助服务请求程序在调用服务前理解服务的内容、范围、要求、输出和效果。
The purpose of the semantic description of the service is to help the service requester to understand the content, scope, requirements, outcomes and effects before the service is invoked.
Web 服务请求和响应（输入和输出消息）在运行时根据 WSDL 进行验证。
The Web service request and response (the input and output messages) are validated against the WSDL at run time.
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