Holistically Stream-based Processing Xtwig Queries

  • Authors:
  • Guoren Wang;Bo Ning;Ge Yu

  • Affiliations:
  • School of Information Science and Engineering, Northeastern University, Shenyang, China 110004;School of Information Science and Engineering, Northeastern University, Shenyang, China 110004;School of Information Science and Engineering, Northeastern University, Shenyang, China 110004

  • Venue:
  • World Wide Web
  • Year:
  • 2008

Quantified Score

Hi-index 0.00

Visualization

Abstract

Unlike a twig query, an Xtwig query contains some selection predicates with reverse axes which are either ancestor or parent. To evaluate such queries in the stream-based context, some rewriting rules have been proposed to transform the paths with reverse axes into equivalent reverse-axis-free ones. However, the transformation method is expensive due to multiple scanning input streams and the generation of unnecessary intermediate results. To solve these problems, a holistic stream-based algorithm XtwigStack is proposed for Xtwig queries. Experiments show that XtwigStack is much more efficient than the transformation method.