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Chaining Geographic Information Web Servicesby: Nadine Alameh
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AbstractThis paper is based on the evolution of Geographic Information Systems towards the web services model. Indeed, this model is rapidly materializing as a result of the advancements in general web service technologies and the focused efforts of the Open GIS Consortium in the areas of service categorization and interoperability of service interfaces. This paper focuses on the issues of service chaining, the process of combining or pipelining results from several complementary and interoperable GIS Web Services to create a customized solution. The paper presents three basic service chaining options: client-coordinated, static and mediated chaining. Each option is examined with respect to its coordination complexity, metadata tracking ability and error handling propagation. The paper highlights the middleware requirements specific to working with GIS services. The paper concludes with a discussion on the potential changes in the GIS marketplace given a successful deployment and chaining of GIS Web Services.
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