http://dspace-roma3.caspur.it:80 The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. 2013-05-23T15:31:52Z http://hdl.handle.net/2307/624 <Title>Quality of mappings for data exchange applications</Title> <Authors>Raunich, Salvatore</Authors> <Issue Date>2010-03-30</Issue Date> <Abstract>Research has investigated mappings among data sources under two perspectives. On one side, there are studies of practical tools for schema mapping generation; these focus on algorithms to generate mappings based on visual specifications provided by users. On the other side, we have theoretical researches about data exchange. These study how to generate a solution -- i.e., a target instance -- given a set of mappings usually specified as tuple generating dependencies. However, these two research lines have progressed in a rather independent way and we are still far away from having a complete understanding of the properties that a "good" schema mapping system should have; to give an example, there are many possible solutions for a data exchange problem. In fact, there is no consensus yet on a notion of quality for schema mappings. In this thesis, based on concepts provided by schema mapping and data exchange research, we aim at investigate such a notion. Our goal is to identify a fairly general formal context that incorporates the different mapping-generation systems proposed in the literature, and to develop algorithms, tools and methods for characterizing the quality of mappings generated by those systems.</Abstract> 2010-03-29T22:00:00Z