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Extra info for Policy-based contracting in semantic web service markets

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4 (Web Service) A Web service is a software service identified by a Uniform Resource Identifier (URI) [RFC05], whose public interfaces and bindings are defined and described using XML. Its definition can be discovered by other software systems. These systems may then interact with the Web service in a manner prescribed by its definition, using XML based messages conveyed by Internet protocols. 2: for discoverability and reusability, a definition prescribing the service’s interaction is required.

5 (Policy) A policy represents some constraint or condition on the use, deployment or description of an owned entity and thereby guides the behavior of an autonomous decision maker (agent). 2 Policy-based Computing 21 interpretable formalism that enables automated decisions, policy changes at runtime and communication of policies to other decision makers. 5 captures a crucial property of a policy formalism: they have to be automatically enforceable by the system each time a decision has to be made.

These policies are relatively independent of the underlying technology. Hence, we say they are business-driven. Instead of distinguishing between business- and device-driven policy definitions one can also divide the policy continuum according to roles of people defining the policies, which leads to a more fine-grain segmentation. Strassner [Str02] suggests introducing different types of views optimized for a certain user group. The Business View allows defining high-level policies using business terms and avoids technical details.

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