Information extraction from various types of sources became very popular during the last decade. Owing to information overload, there are many practical applications that can utilize semantically labeled data extracted from textual sources like the web sites, emails and even conventional sources like newspaper and magazines. Extraction of information from semi-structured or unstructured documents, such as Web pages, is a useful yet complex task. Research has demonstrated that ontology’s may be used to achieve a high degree of accuracy in data extraction while maintaining resiliency in the face of document changes. Ontology’s do not, however, diminish the complexity of a data-extraction system.
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