The Information Manifold Approach to Data Integration
نویسنده
چکیده
A data-integration system provides a uniform interface to a multitude of data sources. Consider a data-integration system providing information about movies from data sources on the World Wide Web. There are numerous sources on the Web concerning movies, such as the Internet Movie Database (which provides comprehensive listings of movies, their casts, directors, genres, and so forth), MovieLink (listing playing times of movies in US cities), and several sites that provide textual reviews for selected movies. Suppose we want to find which Woody Allen movies are playing tonight in Seattle and see their respective reviews. None of these data sources in isolation can answer this query. However, by combining data from multiple sources, we can answer queries like this one, and even more complex ones. To answer our query, we would first query the Internet Movie Database to obtain the list of movies directed by Woody Allen, and then feed the result into the MovieLink database to check which ones are playing in Seattle. Finally, we would find reviews for the relevant movies using any of the movie review sites. Most importantly, a data-integration system lets users focus on specifying what they want, rather than thinking about how to obtain the answers. As a result, it frees them from the tedious tasks of finding the relevant data sources, interacting with each source in isolation using a particular interface, and combining data from multiple sources.
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