Abstract
Web services integration is one of key issues in many B2B applications. Yet, current approaches to this problem tend to use a general-purpose programming language, thus incur type mismatches between the type system of XML schema and the object-oriented type system. In this paper, we present a uniform method for integrating Web services. We propose an extension of XQuery, referred to as WSQuery, which can contain Web service calls. We first present the conceptual evaluation strategy of WSQuery programs. Then, for speeding up the evaluation, we propose to schedule Web service calls to exploit parallelism. We carry out dependency analysis to determine dependency relations among Web service calls. The for loops, if branches and unknown parameters pose particular challenges for dependency analysis and scheduling. We use unfolding techniques to deal with them.
This work is supported in part by 863 Program 2002AA116020 and NSFC 60403019 and 60228006. Part of the work was done while the first author was visiting Hong Kong University of Science and Technology.
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Guo, Z., Wang, X., Zhou, A. (2005). WSQuery: XQuery for Web Services Integration. In: Zhou, L., Ooi, B.C., Meng, X. (eds) Database Systems for Advanced Applications. DASFAA 2005. Lecture Notes in Computer Science, vol 3453. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11408079_34
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DOI: https://doi.org/10.1007/11408079_34
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-25334-1
Online ISBN: 978-3-540-32005-0
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