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Recent work on semi-structured da.ta ha.s revitalized the interest in pa.th qu.eries, i.e., queries that ask for ah pairs of objects in the database that are connected by a, path conforming to a certain specification, in particular to a regular expression. Also, in semi-structured data., as well as in data. integration, da.ta. wa.rehousing, and query optimization, the problem of query rewriting using views is receiving much attention: Given a. query and a collection of views, generate a new query which uses the views and provides the answer to the original one.
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Calvanese et al. (1999) studied this question.
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