PathStack¬: a holistic path join algorithm for path query with not-predicates on XML data

  • Authors:

  • Enhua Jiao;Tok Wang Ling;Chee-Yong Chan

  • Affiliations:

  • School of Computing, National University of Singapore;School of Computing, National University of Singapore;School of Computing, National University of Singapore

  • Venue:
  • DASFAA'05 Proceedings of the 10th international conference on Database Systems for Advanced Applications
  • Year:
  • 2005

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Abstract

The evaluation of path queries forms the basis of complex XML query processing which has attracted a lot of research attention. However, none of these works have examined the processing of more complex queries that contain not-predicates. In this paper, we present the first study on evaluating path queries with not-predicates. We propose an efficient holistic path join algorithm, PathStack¬, which has the following advantages: (1) it requires only one scan of the relevant data to evaluate path queries with not-predicates; (2) it does not generate any intermediate results; and (3) its memory space requirement is bounded by the longest path in the input XML document. We also present an improved variant of PathStack¬ that further minimizes unnecessary computations.