Abstract
AbstractPattern discovery has become a fundamental technique for modern information extraction tasks. This paper presents a new twophase pattern (2PP) discovery technique for information extraction. 2PP consists of orthographic pattern discovery (OPD) and semantic pattern discovery (SPD). The OPD determines the structural features from an identified region of a document and the SPD discovers a dominant semantic pattern for the region via inference, apposition and analogy. 2PP applies discovered pattern back into the region to extract required data items through pattern matching. Experimental evaluation on a large number of identified regions indicates that our 2PP technique achieves effective results.
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