With the explosive growth of Internet and the volume of information published on it, the search and retrieval of desired information has become practically impossible, if its source is not known in advance. This is the reason why search engines have been emerged, aiming to relieve the user from the “lost in hyperspace ” feeling and the information overload. Imagine, however, cases where the result of some query to a search engine contains hundreds of thousands of URLs (Uniform Resource Locators). With such a number of URLs, search engines become in practice inefficient, if we consider that the navigation through even a few decades of URLs is very tiring and time consuming. Thus, instead of trying to address the information overload problem with search engines an
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