• Uwe Borghoff,Pierre-Yves Chevalier,Jutta Willamowski
Verbraeck, A. (ed.): Proc. of the 1st Intl. Conf. EuroMedia/WEBTEC, December 19-21, 1996, London (U.K.). San Diego, CA: The Society for Computer Simulation, pp. 5-12
Information brokerage systems support distributed information gathering for data collections stored within the
World Wide Web or for other on-line data repositories. These systems present a unified face of the underlying
heterogeneity, both in terms of the access/search protocols and in terms of the data schemata. Typically, the
user may input some values (e.g., interpreted as strings within a fulltext search), and may refine/relax them
once she gets too many/little results for her query. Adaptiveness with respect to a refinement of attributes can
improve the precision of the searches dramatically. This paper discusses adaptive refinement of attribute-patterns
together with its main implications in the context of the Constraint-Based Knowledge Broker system.
It presents an implementation for distributed information gathering, and motivates design choices through
concrete examples.
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