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Selective Querying for Adapting Hierarchical Web Service Compositions Using Aggregate Volatility

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Executive Summary

Environments in which Web Service Compositions (WSC) operate are often dynamic. This paper addresses the problem of which service to query for up-to-date information in order to adapt a hierarchical WSC, given that queries are not free. Previously, the Value Of Changed information (VOC) has been proposed to select those services for querying whose revised non-functional information is expected to bring about the most change in the composition. This paper presents an approach for utilizing VOC in the context of a WSC composed of services and lower level WSCs, which induces a natural hierarchy over the composition.

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