An Example-Based Environment for Wrapper Generation

  • Paulo B. Golgher
  • Alberto H. F. Laender
  • Altigran S. da Silva
  • Berthier Ribeiro-Neto
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1921)


In the so-called Web information systems, the role of extracting data of interest from Web sites is played by software components generically known as wrappers. As a result, the existence of flexible tools for designing, developing and maintaining wrappers is crucial. In this paper, we present WByE (Wrapping By Example), a user-oriented set of tools for helping the user to build wrappers. WByE is based on information implicitly provided by the user by means of suitable and intuitive interfaces. It includes two components: the ASByE tool, used for generating specifications on how to fetch desired pages (be them static or dynamic), and the DEByE tool, used for the extraction of data implicitly present in the fetched pages.


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  1. 2.
    Adelberg, B. NoDoSE-A Tool for Semi-Automatically Extracting Structured and Semistructured Data from Text Documents. In Proceedings of the ACM SIG-MOD Conference on Management of Data (Seattle, Washington, 1998), pp. 283–294.Google Scholar
  2. 3.
    Atzeni, P., Mecca, G., and Merialdo, P. Semistructured und Structured Data in the Web: Going Back and Forth. SIGMOD Record 26, 4 (1997), 16–23.CrossRefGoogle Scholar
  3. 4.
  4. 6.
    Hammer, J., Garcia-Molina, H., Nestorov, S., Yerneni, R., Breunig, M.,and Vassalos, V. Template-Based Wrappers in the TSIMMIS Experience. In Proceedings of the ACM SIGMOD Conference on Management of Data (Tucson, Arizona, 1997), pp. 532–535.Google Scholar
  5. 7.
    Hasan, M., Mendelzon, A., and Vista, D. Applying Database Visualization to the World Wide Web. ACM SIGMOD Record 25, 4 (1996), 40–44.Google Scholar
  6. 8.
    Konopnicki, D., and Shmueli, O. Information Gathering in the World-Wide Web: The W3QL Query Language and the W3QS System. ACM Transactions on Database Systems (TODS) 23, 4 (1998), 369–410.Google Scholar
  7. 9.
    Laender, A. H. F., Ribeiro-Neto, B.,da Silva, A. S., and Silva, E. S. Re-presenting Web Data as Complex Objects. In Proceedings of the First International Conference on Electronic Commerce and Web Technologies-EC-Web 2000 (Gre-enwich, UK, 2000), S. Madria and G. Pernull, Eds., Lecture Notes in ComputerScience.Google Scholar
  8. 10.
    Lawrence, S., and Giles, C. Searching the World Wide Web. Science 280, 4 (1998), 98–100.CrossRefGoogle Scholar
  9. 11.
    Liu, L., Pu, C., and Han, W. XWRAP: An XML-enabled Wrapper Construc-tion System for Web Information Sources. In Proceeding of the 16th International Conference on Data Engineering (San Diego, California, 2000), pp. 611–621.Google Scholar
  10. 12.
    Ludäscher, B., Himmeröder, R., Lausen, G., May, W., and Schelepphorst, C. Managing Semistrucutured Data with FLORID: a Deductice Object-Oriented Approach. Information Systems 23, 8 (1998), 589–614.CrossRefGoogle Scholar
  11. 13.
    Muslea, I., Minton, S., and Knoblock, C. A hierarchical approach to wrap-per induction. In Proceedings of the 3rd Conference on Autonomous Agents (Seattle,Washington, 1999), pp. 190–199.Google Scholar
  12. 14.
    Quass, D., Widom, J., Goldman, R., Haas, K., Luo, Q., McHugh, J., Ne-storov, S., Rajaraman, A., Rivero, H., Abiteboul, S., Ullman, J. D., and Wiener, J. L. LORE: A Lightweight Object REpository for Semistructured Data. In Proceedings of the International ACM SIGMOD Conference on Management of Data (Montreal, Canada, 1996), p. 549.Google Scholar
  13. 15.
    Ribeiro-Neto, B., Laender, A. H. F., and da Silva, A. S. Extracting Semi-Structured Data Through Examples. In Proceedings of the Eighth ACM Internatio-nal Conference on Information and Knowledge Management-CIKM'99 (Kansas City, Missouri, 1999), pp. 94–101.Google Scholar
  14. 16.
    Sahuguet, A., and Azavant, F. Web Ecology: Recycling HTML pages as XML documents using W4F. In Proceedings of the Second International Workshop on the Web and Databases (Philadelphia, Pennsylvania, 1999), pp. 31–26.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Paulo B. Golgher
    • 1
  • Alberto H. F. Laender
    • 1
  • Altigran S. da Silva
    • 1
  • Berthier Ribeiro-Neto
    • 1
  1. 1.Departament of Computer ScienceFederal University of Minas GeraisBelo Horizonte MGBrazi

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