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Wrapper Stability

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Encyclopedia of Database Systems

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Synonyms

Wrapper robustness; Wrapper adaptability

Definition

A wrapper, whether hand written or generated by a Web data extraction system, is a program that extracts data from information sources of changing content and translates the data into a different format. The stability of a wrapper is the degree of insensitivity to changes of the presentation (i.e., formatting, layout, or syntax) of the data sources. A stable wrapper is ideally able to extract the desired data from source documents even if the layout of the current documents differs from the layout of those documents that were used as examples at the time the wrapper was generated. Thus, a wrapper is stable or robust if it is able of coping with perturbations of the original layout.

Key Points

Documents, and, Web pages in particular are usually susceptible to slight layout changes over time. Most of these changes are minor changes. For example, an advertisement may be added to the top of a Web page. One would ideally wish that...

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Recommended Reading

  1. Baumgartner R., Flesca S., and Gottlob G. Visual web information extraction with Lixto. In Proc. 27th Int. Conf. on Very Large Data Bases, 2001, pp. 119–128.

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  2. Davulcu H., Yang G., Kifer M., and Ramakrishnan I.V. Computational aspects of resilient data extraction from semistructured sources. In Proc. 19th ACM SIGACT-SIGMOD-SIGART Symp. on Principles of Database Systems, 2000, pp. 136–144.

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  3. Meng X., Hu D., and Li C. Schema-guided wrapper maintenance for web-data extraction. In Proc. Fifth ACM CIKM Int. Workshop on Web Information and Data Management, 2003, pp. 1–8.

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  4. Phelps T.A. and Wilensky R. Robust intra-document locations. In Proc. 9th Int. World Wide Web Conf., 2000, pp. 105–118.

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  5. Wong T. and Lam W. A probabilistic approach for adapting information extraction wrappers and discovering new attributes. In Proc. 2004 IEEE Int. Conf. on Data Mining, 2004, pp. 257–264.

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Author information

Authors and Affiliations

  1. Oxford University, Oxford, UK

    Georg Gottlob

Authors
  1. Georg Gottlob
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Editor information

Editors and Affiliations

  1. College of Computing, Georgia Institute of Technology, 266 Ferst Drive, 30332-0765, Atlanta, GA, USA

    LING LIU (Professor) (Professor)

  2. Database Research Group David R. Cheriton School of Computer Science, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada

    M. TAMER ÖZSU (Professor and Director, University Research Chair) (Professor and Director, University Research Chair)

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© 2009 Springer Science+Business Media, LLC

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Gottlob, G. (2009). Wrapper Stability. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_1169

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