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One of the most important features of XML-based Web services is that they can be easily accessed over the Internet, but this makes them vulnerable to a series of security threats. What makes security for web services so challenging is their distributed and heterogeneous nature. Access control policy specification for controlling access to Web services is then becoming an emergent research area due to the rapid development of Web services in modern economy. Two relevant access control languages using XML are WS-Policy and XACML.
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