XML,
SOAP,
UDDI,
WSDL.
The Web Services Architecture
Three major aspects to Web services:
A service provider provides an interface for software that can carry out a specified set of tasks.
A service requester discovers and invokes a software service to provide a business solution. The requester will commonly invoke a remote procedure call on the service provider, passing parameter data to the provider and receiving a result in reply.
A repository or broker manages and publishes the service. Service providers publish their services with the broker, and requests access those services by creating bindings to the service provider
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