中文摘要：

Yan-Hui Ding is a Ph.D. candidate in computer science, Shandong University. He is a member of CCF. His research interests include Web information integration and Web information extraction. Qing-Zhong Li is a professor at School of Computer Science and Technology, Shandong University. He is a senior member of CCF. His research interests include Web information integration and enterprise information integration. Yong-Quan Dong is a Ph.D. candidate in computer science, Shandong University. He is a member of CCF. His research interests include Web information integration and Web data management. Zhao-Hui Peng is a lecturer at School of Computer Science and Technology, Shandong University. He received his Ph.D. degree from School of Information, Renmin University. He is a member of CCF. His research interest include information retrieval.