In 2000, the World Wide Web Consortium (W3C) accepted a submission for the Simple Object Access protocol (SOAP). This XML-based messaging format established a transmission framework for inter-application or inter-service communication via HTTP. As a vendor neutral technology, SOAP provided an attractive alternative to traditional proprietary protocols, such as CORBA (Common Object Request Broker Architecture) and DCOM (Distributed Component Object Model).
In the following year, W3C has accepted and published the WSDL specification. WSDL (Web Service Description Language) is implemented through XML and acts as the interface in the interface/implementation model of Web service. It is essentially a language that is used to describe the interface of the Web service.
The interface is further supplemented by the Universal Description, Discovery and Integration (UDDI) specification. The UDDI much like a yellow page directory allows users to perform dynamic searches on the directory for a specific service implementation.
Since then, XML Web services has received industry wide acceptance. The support for XML Web services has furthered the popularity and importance of a service oriented design principle.
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