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Uma Abordagem Top-Down para Geração das Correspondências entre XML Schemas Semânticos

Vânia Maria Ponte VidalRenata Maria de Figueirêdo Vilas Boas

The goal of data integration systems is to allow integrated access to multiple heterogeneous information sources, providing the user with a unified view (virtual or One of the most important aspects in the design of data integration systems is the specification of the correspondence between the data at the sources and those in the mediated schema. In this work, we propose a top-down approach for generating the correspondence between XMLS+ schemas. We present the formal definitions of several types of correspondence assertions, which are used to formally specify the semantic relationships among elements of XMLS+ schemas. The advantage of our formalism is that it allows us to define, in a precise way, the mappings between the sources and the mediated schema. It is exactly these mapping that will determine how queries defined against the virtual mediated view will be answered based on queries formulated against the local sources; and, in case the mediated view is materialized, they are used to correctly maintain the materialized view.

http://www.lbd.dcc.ufmg.br:8080/colecoes/sbbd/2002/017.pdf

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