Query Evaluation for Mediators over Web Catalogs
نویسندگان
چکیده
The Web catalogs like Yahoo! and Open Directory are very useful for browsing and querying the Web. Although they index only a fraction of the pages that are indexed by search engines these catalogs are hand-crafted by domain experts and are therefore of high quality. We present a model for building mediators over Web catalogs, so as to provide users with cus-tomized views of such catalogs. We focus on query evaluation, speciically on the complexity of query answering by the mediator .
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تاریخ انتشار 2002