Current regulatory requirements in the U.S. and other countries make it increasingly important for Web Services to be able to enforce and verify their compliance with privacy policies. Structured policy languages can play a major role by supporting automated enforcement of policies and auditing of access decisions. This paper compares two policy languages that have been developed for use in expressing directly enforceable privacy policies -- the Enterprise Privacy Authorization Language (EPAL) and the OASIS Standard eXtensible Access Control Markup Language (XACML), together with its standard privacy profile.
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