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Abstract : |
The construction and maintenance of data warehouses (views) in large-scale environments composed of numerous distributed information sources (ISs) such as the WWW has received great attention recently. Such environments are plagued with continuously changing information because ISs tend to continuously evolve by modifying not only their content but also their query capabilities and interface and by joining or leaving the environment at any time. In this paper, we outline our position on issues related to the challenging new problem of how to adapt views in such evolving environments. We first present a taxonomy of view adaptation problems by describing the dimensions along which view adaptation problems can be classified. Based on this taxonomy, we identify a new view adaptation problem for view evolution in the context of ISs capability changes, which we call View Synchronization. We also outline the Evolvable View Environment (EVE) that we propose as framework for solving the view synchronization problem, along with our decisions concerning some of the key design issues surrounding EVE., |
