Author: Lalana Kagal et al., Title: A Policy Based Approach to Security for the Semantic Web CNF: InProceedings, 2nd International Semantic Web Conference (ISWC2003), September 2003. Comment: OWL-S has been linked to Rei. Rei is a RDF-Schema-based language for policy specification. It is modeled on deontic concepts ofrights, prohibitions, obligations and dispensations. These constructs have four attributes: actor, action,provision, and constraint. Constraint specifies conditions over the actor, action, and any other context entitythat must be true at invocation. Provisions, which represent the actor’s obligations, describe conditions thatshould be true after invocation. These basic constructs allow Rei to represent different kinds of policies,including authorization, privacy and confidentiality. The class Policy is at the root of the Rei ontology.Policy has subclasses of PrivacyPolicy, AuthorizationPolicy and ConfidentialityPolicy. Rei’s Policy class islinked with the OWL-S ontology by defining a new OWL-S description property, policyEnforced, of whichPolicy is the range (see www.csee.umbc.edu/~lkagal/rei/examples/ses-sec/swspolicy.owl). Linking OWL-Swith Rei allows specification of privacy, authentication and confidentiality to be specified for serviceproviders and requesters. 其他资料：Lalana Kagal, "Rei : A Policy Language for the Me-Centric Project", TechReport, HP Labs, September 2002.
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