Catalog integration made easy

The fact that, most of the time, the integration of different catalogs implies the generation, maintenance and adaptation of a global catalog that forwards the appropriate queries to the corresponding local catalogs for evaluation, requires us to perform query rewriting in order to provide the user with an answer. We provide some insight on the adaptive evaluation techniques for querying XML-based electronic catalogs. This technique eliminates the need to perform an explicit query rewriting when performing a query upon a global catalog, while still obtaining accurate answers, as we show in our experiments.