My Liberty Alliance colleague Robin Wilton presented a position paper (co-authored by Robin, HP Lab's Marco Cassasa Mont, and myself) at the "W3C Workshop on Languages for Privacy Policy Negotiation and Semantics-Driven Enforcement" (now that would be an acronym).
In the paper we proposed a taxonomy of privacy language types for identity services, examined the relevance of various XML-based policy languages for supporting these different aspects, and considered how the Liberty Alliance's ID-WSF <UsageDirectives> SOAP Header can be used to move such policies around.
Robin's slides are available here.
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