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A bottom-up algorithm for query decomposition

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Figure

Figure 1    Example of a global schema and two local schemas (from Lausen and Marron (2002))
Figure 2      Pseudo-code of the algorithm for finding a subquery  Thus, by applying this algorithm for all local schemas,  local subqueries are obtained for these local sources
Figure 6        A local schema without the price leaf node (adapted  from Lausen and Marron (2002))
Figure 8   Homonym conflicts in a global schema and a local  schema

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