Accessing information sources to retrieve data requested by a user can be expensive, especially when dealing with distributed information sources. One way to reduce this cost is t...
We present a semantic caching approach for optimizing the performance of information mediators. A critical problem with information mediators, particularly those gathering and int...
In: Proceedings of the Sixth International Conference On Flexible Query Answering Systems (FQAS-04), Springer-Verlag LNAI 3055, pp. 203-216. c 2004 by Springer-Verlag. To model qu...
The question whether a given set of views, defined by queries, can be used to answer another query, arises in several contexts such as query optimization, data integration and se...