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Keyword queries have become a popular alternative to structured query languages, since they do not require the users to have a good knowledge of the way data has been organized in the source. Keyword-based searching techniques on databases and on XML documents typically rely on the construction of specialized indexes on the instances. These indexes are used to identify at run-time the database objects corresponding to the keywords. Unfortunately, there are many practical application scenarios in which construction of such indexes is not possible.
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