Despite the improvements in XML-based catalog research [1,2,3], the problems found in the classical view approach to catalog integration [5] have not yet been solved. 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. Otherwise, due to the relative differences among the global and local catalogs, an answer to a particular query may not be found. In our poster, we provide some insight on the adaptive evaluation techniques described more extensively in [4] 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.