Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Web Harvesting

  • Wolfgang Gatterbauer
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_1172

Synonyms

Web data extraction; Web information extraction; Web mining

Definition

Web harvesting describes the process of gathering and integrating data from various heterogeneous web sources. Necessary input is an appropriate knowledge representation of the domain of interest (e.g., an ontology), together with example instances of concepts or relationships (seed knowledge). Output is a structured data (e.g., in the form of a relational database) that is gathered from the Web. The term harvesting implies that, while passing over a large body of available information, the process gathers only such information that lies in the domain of interest and is, as such, relevant.

Key Points

The process of web harvesting can be divided into three subsequent tasks:
  1. (i)

    Data or information retrieval, which involves finding relevant information on the Web and storing it locally. This task requires tools for searching and navigating the Web, i.e., crawlers and means for interacting with dynamic or...

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Recommended Reading

  1. 1.
    Ciravegna F, Chapman S, Dingli A, Wilks Y. Learning to harvest information for the Semantic Web. In: Proceedings of the 1st European Semantic Web Symposium; 2004. p. 312–26.Google Scholar
  2. 2.
    Crescenzi V, Mecca G. Automatic information extraction from large websites. J ACM. 2004;51(5):731–79.MathSciNetzbMATHCrossRefGoogle Scholar
  3. 3.
    Etzioni O, Cafarella MJ, Downey D, Kok S, Popescu AM, Shaked T, Soderland S, Weld DS, Yates A. Web-scale information extraction in KnowItAll: (preliminary results). In: Proceedings of the 12th International World Wide Web Conference; 2004. p. 100–10.Google Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.University of WashingtonSeattleUSA

Section editors and affiliations

  • Georg Gottlob
    • 1
  1. 1.Computing Lab.Oxford Univ.OxfordUK