XML Web services can be thought of the building blocks for distributed computing over the internet. A particular functionality can be exposed as a web service and that can be used by others in their programming, thus enabling them not to program the same service again.

Services from different sources can be integrated to create a powerful web application. Communication between the web-applications is done through XML technologies that form the basics of any web service.

The protocol that is used to expose the functionality is the SOAP. For any other user to use that functionality in their application, the web service has to be described properly with all the interfaces available.

This is done by WSDL document which is the Web Services Description Language document. To find out which web services are available, they are registered through UDDI - Universal Discovery Description and Integration.

Communication between a web service and an application is through SOAP, hence the application can be written in any language. Moreover it is less complex than the earlier methods used for such communications like DCE and CORBA.

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