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The visual layout of a webpage can provide valuable clues for certain typesof Information Extraction (IE) tasks. In traditional rule based IE frameworks,these layout cues are mapped to rules that operate on the HTML source of thewebpages. In contrast, we have developed a framework in which the rules can bespecified directly at the layout level. This has many advantages, since thehigher level of abstraction leads to simpler extraction rules that are largelyindependent of the source code of the page, and, therefore, more robust. It canalso enable specification of new types of rules that are not otherwisepossible. To the best of our knowledge, there is no general framework thatallows declarative specification of information extraction rules based onspatial layout. Our framework is complementary to traditional text based rulesframework and allows a seamless combination of spatial layout based rules withtraditional text based rules. We describe the algebra that enables such asystem and its efficient implementation using standard relational and textindexing features of a relational database. We demonstrate the simplicity andefficiency of this system for a task involving the extraction of softwaresystem requirements from software product pages.

WYSIWYE: An Algebra for Expressing Spatial and Textual Rules for Visual Information Extraction