In the NeP4B project the MOMIS data integration system was extended with data quality concepts. Starting from this obtained framework, the aim of this paper is twofold; first, we consider data quality metadata in the specification of queries on the Global Schema of the integration system; in this way we can express the quality of the retrieved data by means of threshold of acceptance. Second, we will discuss how the quality constraints specified in the query are useful to perform some query optimization techniques.
Data Quality Aware Queries in the MOMIS Integration System / Beneventano, Domenico; R., Carlos Nana Mbinkeu. - STAMPA. - (2010), pp. 462-473. (Intervento presentato al convegno Eighteenth Italian Symposium on Advanced Database Systems, SEBD 2010 tenutosi a Rimini, Italy nel June 20-23 - 2010).