7.4. Summary
Ensuring the quality of service of Web services interactions is one of the most critical requirements of the Web services stack of specifications. Several specifications described later in this booksuch as WS-Security, WS-Reliable messaging, and WS-Transactionsdefine the protocols that support specific aspects of this requirement. In a service-oriented environment, where loose coupling between applications is a fundamental property, the quality of service capabilities and requirements of a service must be declaratively expressed in standardized vocabularies so that you can properly configure and maintain partner services and avoid unnecessary coupling. WS-Policy defines a general-purpose framework for representing and combining statements about the quality of service properties. WS-Policy is an extensible framework that can accommodate domain-specific dialects to represent these assertions and allow the attachment of policies to arbitrary types of subjects though the generic attachment mechanisms that WS-PolicyAttachments define. |
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