On Extending WS-Policy with Specification of XML Web Service Semantics, Monitoring, and Control Driven by Business Value

摘要

WS-Policy is a general framework for the specification of policies for XML Web services. However, it currently lacks detailed specification of ontological meaning, quality of service (QoS) monitoring, executed actions, business value (e.g., prices), and other aspects necessary for comprehensive description of Web service semantics, monitoring, and control activities. We first discuss principles for specification of such information for Web services and how this can be done with policies. Then, we present our WS-Policy4MASC extension of WS-Policy. It enables specification of goal, action, utility, and meta- policy assertions, as well as a number of related constructs (including ontological meaning). Consequently, a Web service composition can be comprehensively described with WSDL, WSBPEL, and WS-Policy4MASC, without the need for additional languages (e.g., OWL-S, WSLA, WSOL, WS-Agreement, or WS-CoL). We illustrate our solutions on a weather temperature Web service example. WS-Policy4MASC is used in our Manageable and Adaptable Service Compositions (MASC) middleware.