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The interoperability of heterogeneous data sources is an important issue
in many applications such as mediation systems or web-based systems. In
these systems, each data source exports a schema and each application defines
a target schema representing its needs. The way instances of the target schema
are derived from the sources is described through mappings. Generating such
mappings is a difficult task, especially when the schemas are semi structured.
In this paper, we propose an approach for mapping generation in an XML context;
the basic idea is to decompose the target schema into subtrees and to find
mappings, called partial mappings, for each of them; the mappings for the
whole target schema are then produced by combining the partial mappings and
checking that the structure of the target schema is preserved. We also present a
tool supporting our approach and some experimental results.