Encyclopedia of Database Systems

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

Languages for Web Data Extraction

  • Nicholas Kushmerick
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_1156

Synonyms

Information extraction; Screen scraping; Web mining; Web scraping; Web site wrappers

Definition

Web data extraction is the process of automatically converting Web resources into a specific structured format. For example, if a collection of HTML web pages describes details about various companies (name, headquarters, etc) then web data extraction would involve converting this native HTML format into computer-processable data structures, such as entries in relational database tables. The purpose of web data extraction is to make web data available for subsequent manipulation or integration steps. In the previous example, the goal may be summarizing the results as some form of analytical report.

There are several approaches to Web data extraction. The most common approach is to specify the conversion process using a special-purpose programming Language for Web Data Extraction. Web data extraction then becomes a matter of executing a well-defined computer program.

Web data...

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Recommended Reading

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Copyright information

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

Authors and Affiliations

  1. 1.VMWareSeattleUSA

Section editors and affiliations

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