Web Services Policy
Web services are used successfully for interoperable solutions across a wide range of industries. A key reason for the investment and interest in Web services is that they are well-suited to enable systems that are service-oriented. SOAP, XML Schema and WSDL, which are XML-based technologies, provide foundation to build interoperable Web services. To extend this foundation, WS-Policy, offers the mechanisms that represent the requirements and capabilities of the services as Policies.
The visible aspects of a web service are metadata expressions. This is a fusion of human and machine readable languages. The machine readable languages are the reason why tooling can be enabled. Tools that can use metadata service have the ability to automatically generate client codes that call the service.
Source: w3.org“>W3.org