Automatically assigned DDC number: 00574

Manually assigned DDC number: 00574

Number of references: 31

Title: Rewriting of Regular Expressions and Regular Path Queries

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Subject: Diego Calvanese,Maurizio Lenzerini,Moshe Y. Vardi Rewriting of Regular Expressions and Regular Path Queries

Description: Recent work on semi-structured data has revitalized the interest in path queries, i.e., queries that ask for all pairs of objects in the database that are connected by a path conforming to a certain specication, in particular to a regular expression. Also, in semi-structured data, as well as in data integration, data warehousing, 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. In this paper we address the problem of query rewriting using views in the context of semistructured data. We present a method for computing the rewriting of a regular expression E in terms of other regular expressions. The method computes the exact rewriting (the one that denes the same regular language as E) if it exists, or the rewriting that denes the maximal language contained in the one dened by E, otherwise. We present a complex...

Contributor: The Pennsylvania State University CiteSeer Archives

Publisher: unknown

Date: 1999-09-13

Pubyear: 1999

Format: ps

Identifier: http://citeseer.ist.psu.edu/235029.html

Source: http://www.cs.rice.edu/~vardi/papers/pods99rj.ps.gz

Language: en

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