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These features are different in the Web pages collected from different Web sites, while they are similar in the Web pages originating from the same site. In our framework, we derive the site-invariant features from previously learned extraction knowledge and the items previously collected or extracted from the source Web site. The derived site-invariant features will be exploited to automatically seek a new set of training examples in the new unseen target site. Both the site-dependent features and the site-invariant features of these automatically discovered training examples will be considered in the learning of new information extraction knowledge for the target site. We conducted extensive experiments on a set of real-world Web sites collected from three different domains to demonstrate the performance of our framework. For example, by just providing training examples from one online book catalog Web site, our approach can automatically extract information from ten different book catalog sites achieving an average precision and recall of 71.9% and 84.0% respectively without any further manual intervention.<\/jats:p>","DOI":"10.1145\/1189740.1189746","type":"journal-article","created":{"date-parts":[[2007,4,5]],"date-time":"2007-04-05T19:20:08Z","timestamp":1175800808000},"page":"6","update-policy":"http:\/\/dx.doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":16,"title":["Adapting Web information extraction knowledge via mining site-invariant and site-dependent features"],"prefix":"10.1145","volume":"7","author":[{"given":"Tak-Lam","family":"Wong","sequence":"first","affiliation":[{"name":"City University of Hong Kong, Kowloon, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wai","family":"Lam","sequence":"additional","affiliation":[{"name":"The Chinese University of Hong Kong, Shatin, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2007,2]]},"reference":[{"key":"e_1_2_1_1_1","volume-title":"Proceedings of the Fourteenth Innovative Applications of Artificial Intelligence Conference, 862--869","author":"Ambite J."},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1145\/956750.956759"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.5555\/2073876.2073883"},{"key":"e_1_2_1_4_1","volume-title":"Proceedings of the International Workshop on the Web and Databases, 172--183","author":"Brin S.","year":"1998"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1162\/153244304322972685"},{"key":"e_1_2_1_6_1","volume-title":"Proceedings of the Information Processing Society of Japan, 7--18","author":"Chawathe S."},{"key":"e_1_2_1_7_1","volume-title":"Proceedings of the Seventeenth International Joint Conference on Artificial Intelligence (IJCAI), 1251--1256","author":"Ciravegna F.","year":"2001"},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1010031208520"},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/S1389-1286(99)00047-X"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1145\/511446.511477"},{"key":"e_1_2_1_11_1","volume-title":"Proceedings of the 27th Very Large Databases Conference (VLDB), 109--118","author":"Crescenzi V."},{"key":"e_1_2_1_12_1","doi-asserted-by":"publisher","DOI":"10.1145\/267658.267666"},{"key":"e_1_2_1_13_1","volume-title":"Proceedings of the Eleventh International Joint Conference on Artificial Intelligence (IJCAI), 1034--1041","author":"Downey D."},{"key":"e_1_2_1_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.artint.2005.03.001"},{"key":"e_1_2_1_15_1","volume-title":"Proceedings of the AAAI-99 Workshop on Machine Learning for Information Extraction.","author":"Freitag D.","year":"1999"},{"key":"e_1_2_1_16_1","doi-asserted-by":"publisher","DOI":"10.1145\/266714.266721"},{"key":"e_1_2_1_17_1","volume-title":"Proceedings of the Workshop on Linguistic Knowledge Acquisition and Representation: Bootstrapping Annotated Data at the Linguistic Resources and Evaluation Conference.","author":"Ghani R."},{"key":"e_1_2_1_18_1","doi-asserted-by":"publisher","DOI":"10.1145\/502585.502648"},{"key":"e_1_2_1_19_1","doi-asserted-by":"crossref","unstructured":"Gusfield D. 1997. 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