Synonyms
Wrapper adaptability; Wrapper robustness
Definition
A wrapper, whether handwritten 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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Gottlob, G. (2018). Wrapper Stability. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_1169
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DOI: https://doi.org/10.1007/978-1-4614-8265-9_1169
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