Describe Languages' Comparing for Web Information Extraction Rules Based on Page Structure

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[1]	. Data Transformation in the Data Exchange [J]. Journal of Hebei University (Natural Science Edition), 2003, 23(2): 215-220.
[2]	. Evolution of Information Extraction Techniques on the Web [J]. Journal of Hebei University (Natural Science Edition), 2003, 23(1): 106-112.
[3]	. Application of Classified Cache Database in Web Query System [J]. Journal of Hebei University (Natural Science Edition), 2002, 22(2): 170-174.
[4]	. Web Information Extraction Based on Samples [J]. Journal of Hebei University (Natural Science Edition), 2001, 21(4): 431-437.
[5]	. Evolution of Information Query on the Web [J]. Journal of Hebei University (Natural Science Edition), 2001, 21(3): 347-354.

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