GUIs for Web Data Extraction
Visual web data extraction; Visual web information extraction; Wrapper generator GUIs
While content management systems (CMS) are geared towards adding presentational information to relational and structured data from database systems, thus dynamically generating HTML documents, the goal of GUIs for Web data extraction is diametrically opposed: The commonly semi-automatic Web data extraction tools intend to removeall presentational information from Web pages, so that only pure structured content remains. The extraction process itself does not address single documents, but template types, such as the product page of an online retailer or the news page template of an online journal. That is, for each template type, one set of extraction rules is generated. These extraction rules are defined in a graphical manner, by selecting the pieces of information that are relevant and by assigning labels to them. To this end, GUIs are used that largely resemble Web browsers,...
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