This XML file would be validated again by the service requester using an XSD file. The service provider validates the service request and sends structured data in an XML file, using the SOAP protocol. The service requester contacts UDDI to find out who is the provider for the data it needs, and then it contacts the service provider using the SOAP protocol. Web services architecture: the service provider sends a WSDL file to UDDI. Another application offered to the end-user may be a mashup, where a Web server consumes several Web services at different machines and compiles the content into one user interface. Many organizations that provide data in formatted HTML pages will also provide that data on their server as XML or JSON, often through a Web service to allow syndication, for example, Wikipedia's Export. In practice, a web service commonly provides an object-oriented Web-based interface to a database server, utilized for example by another Web server, or by a mobile app, that provides a user interface to the end-user.

In a Web service a Web technology such as HTTP is used for transferring machine-readable file formats such as XML and JSON. a server running on a computer device, listening for requests at a particular port over a network, serving web documents (HTML, JSON, XML, images).a service offered by an electronic device to another electronic device, communicating with each other via the World Wide Web, or.Service offered by an electronic device to another electronic device, communicating with each other via the World Wide Web

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