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Tree Multivalued Dependencies for XML Datasets

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Advances in Web-Age Information Management (WAIM 2004)

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 3129))

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Abstract

This paper introduces tree multivalued dependencies (TMVDs) for XML documents by extending multivalued dependencies in relational databases and recent research about tree functional dependencies (TFDs). We show the existence of the TMVDs in XML documents that produce redundancies and update anomalies. Secondly, the precise definition of TMVDs is proposed, which is based on the tree structure and deep equality. Moreover, we introduce the concept of recomposition that is a reconstruction of an XML database by moving or adding nodes. The right side of TMVDs is characterized by single attribute and multiple attributes, for which there are different recompositions. In addition, the relationship between TFDs and TMVDs is investigated, and we demonstrate that a TMVD is a generalized TFD. Furthermore, we present a theorem showing the recomposition by TMVDs saves space. Finally, we exhibit a recomposition that is not equivalent to any relational data.

This research was made possible through funding from the Natural Sciences and Engineering Research Council of Canada.

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Author information

Authors and Affiliations

  1. Department of Computer Science, University of Regina, Canada

    Lawrence V. Saxton & Xiqun Tang

Authors
  1. Lawrence V. Saxton
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  2. Xiqun Tang
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Editor information

Editors and Affiliations

  1. Department of Computer Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, China

    Qing Li

  2. Shenyang Liaoning, Northeastern University, 110004, China

    Guoren Wang

  3. Dept. of Computer Science & Technology, Tsinghua University, Beijing, China

    Ling Feng

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© 2004 Springer-Verlag Berlin Heidelberg

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Saxton, L.V., Tang, X. (2004). Tree Multivalued Dependencies for XML Datasets. In: Li, Q., Wang, G., Feng, L. (eds) Advances in Web-Age Information Management. WAIM 2004. Lecture Notes in Computer Science, vol 3129. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-27772-9_36

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  • DOI: https://doi.org/10.1007/978-3-540-27772-9_36

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-22418-1

  • Online ISBN: 978-3-540-27772-9

  • eBook Packages: Springer Book Archive

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