Application design driven by user needs is an in- creasing trend: such applications may not be anticipatable us- ing traditional requirement and build approaches. Mashup refers to an integrated Application Programming Interface (API) that combines data from different data destination or third party sources for web services. This web service pro- vides a combined API that is technologically valid and com- patible with other web applications. In recent years, web mash ups have been tested for solving many issues in existing web applications, such as e-science. In this paper, we analyzed a real service problem in a current virtual organization to show current limitations of using a distributed architecture, and to describe a web service orientated architecture using the mashup concept. We provide a schematic solution for a para- digmatic user application problem, illustrated by a specific map usage need based on geographical information system data. Specifically, our illustrative application is finding the closest hotel within walking range of a meeting venue. Based on the case issues, we outline a generic architecture that offers a dynamic solution for web portals providing services for dy- namic user needs.
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