Recent experiments and analysis suggest that there are about 800 million publicly-indexable Web pages. However, unlike books in a traditional library, Web pages continue to change...
In order to return relevant search results, a search engine must keep its local repository synchronized to the Web, but it is usually impossible to attain perfect freshness. Hence...
Search engines process queries conjunctively to restrict the size of the answer set. Further, it is not rare to observe a mismatch between the vocabulary used in the text of Web p...