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Holistically Stream-based Processing Xtwig Queries

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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.

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Authors and Affiliations

  1. School of Information Science and Engineering, Northeastern University, Shenyang, 110004, China

    Guoren Wang, Bo Ning & Ge Yu

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  1. Guoren Wang
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  2. Bo Ning
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  3. Ge Yu
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Correspondence to Guoren Wang.

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Wang, G., Ning, B. & Yu, G. Holistically Stream-based Processing Xtwig Queries. World Wide Web 11, 407–425 (2008). https://doi.org/10.1007/s11280-008-0047-z

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