服务描述 Services are described using a standardized interface(metadata Defines the service, its operations, and input and output parameters Defines how the service is reached and its location Input and outputs may be simple parameters or XML documents An existing application can be given a service facade The facade(e.g. an EJB)is then described as the service Web Services Description Language(WSDL)is the standard used to describe the service8 服务描述 ▪ Services are described using a standardized interface (metadata) Defines the service, its operations, and input and output parameters Defines how the service is reached and its location ▪ Input and outputs may be simple parameters or XML documents ▪ An existing application can be given a service ‘façade’ The façade (e.g. an EJB) is then described as the service ▪ Web Services Description Language (WSDL) is the standard used to describe the service