Efficient algorithms for processing XPath queries

Authors:
Georg Gottlob;Christoph Koch;Reinhard Pichler
Affiliations:
Database and Artificial Intelligence Group, Technische Universität, Wien, Vienna, Austria;Database and Artificial Intelligence Group, Technische Universität, Wien, Vienna, Austria;Database and Artificial Intelligence Group, Technische Universität, Wien, Vienna, Austria
Venue:
VLDB '02 Proceedings of the 28th international conference on Very Large Data Bases
Year:
2002

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Abstract

Our experimental analysis of several popular XPath processors reveals a striking fact: Query evaluation in each of the systems requires time exponential in the size of queries in the worst case. We show that XPath can be processed much more efficiently, and propose main-memory algorithms for this problem with polynomial-time combined query evaluation complexity. Moreover, we present two fragments of XPath for which linear-time query processing algorithms exist.