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This tutorial by Tyler Anderson, Part 5 of the "Understanding Web Services Specifications" series, explains the concepts behind WS-Policy and related standards, such as WS-SecurityPolicy, which provide a means to specify possible configurations of a Web service, and also to enforce defined security and authentication.

Web services (WS) Policy provides a common syntax to express additional information required for Web services to communicate in a platform independent manner. In this article Sanka Samaranayake explains the role of WS Policy in advanced interoperability between Web services with the increasing complexitiy of user requirements.