IEPAD: Information Extraction Based on Pattern Discovery Chia-Hui Chang Dept. of Computer Science and Information Engineering Shao-Chen Lui Dept. of Computer Science and Information Engineering National Central University, Chung-Li, Taiwan 320 Tel: +886-3-4227151x4523 National Central University, Chung-Li, Taiwan 320 email@example.com Fortunately, researchers have built tools that can generate wrappers automatically. For example, WIEN , Softmealy , Stalker  etc. are three famous works in this field. Similar to scanner or parser generator for compilers where users provide the syntax grammar and get the transition tables for scanner or parser drivers, these wrapper construction systems actually output extraction rules from training examples provided by the designer of the wrapper. The common idea involved is the machine learning techniques to summarize extraction rules, while the difference is the extractor architectures presumed in each system. For example, the single-pass, LR structure in WIEN and the multi-pass, hierarchical structure in Stalker. Nevertheless, the designer must manually label the beginning and the end of the training examples for generating the rules. Manual labeling, in general, is time-consuming and not efficient enough. Recently, researchers are exploring new approaches to fully automate wrapper construction. That is, without users training examples. For example, Embley et
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