PROGRAM GUIDE The 5th APWeb-WAIM International Joint Conference on Web and Big Data (APWeb-WAIM 2021) August 23-25, 2021 Guangzhou, China Organizing Committee General Chairs Yi Cai South China University of Technology, China Tom Gedeon Australia National University, Australia Qing Li Hong Kong Polytechnic University, China Baltasar Fernández Manjón UCM, Spain Program Committee Chairs Leong Hou U University of Macau, China Marc Spaniol Université de Caen Normandie, France Yasushi Sakurai Osaka University, Japan Workshop Chairs Yunjun Gao Zhejiang University, China An Liu Soochow University, China Xiaohui Tao University of Southern Queensland, Australia Demo Chair Yanghui Rao Sun Yat-Sen University, China Tutorial Chair Raymond Chi-Wing Wong Hong Kong University of Science and Technology, China Industry Chair Jianming Lv South China University of Technology, China Publication Chair Junying Chen South China University of Technology, China Publicity Chairs Xin Wang Tianjin University, China Jianxin Li Deakin University, Australia Local Arrangement Chairs Guohua Wang South China University of Technology, China Junying Chen South China University of Technology, China Webmaster Jianwei Lu South China University of Technology, China APWeb-WAIM Steering Committee Representative Yanchun Zhang Victoria University, Australia Schedule at a Glance Welcome Message from the General Chairs On behalf of the Organizing Committee, it is our great pleasure to welcome you to The Fifth Asia Pacific Web (APWeb) and Web-Age Information Management (WAIM) Joint Conference on Web and Big Data (APWeb-WAIM 2021). APWeb and WAIM are two separate leading international conferences on research, development, and applications of Web technologies and database systems. Previous APWeb conferences were held in Beijing (1998), Hong Kong (1999), Xi’an (2000), Changsha (2001), Xi’an (2003), Hangzhou (2004), Shanghai (2005), Harbin (2006), Huangshan (2007), Shenyang (2008), Suzhou (2009), Busan (2010), Beijing (2011), Kunming (2012), Sydney (2013), Changsha (2014), Guangzhou (2015), and Suzhou (2016). Previous WAIM conferences were held in Shanghai (2000), Xi’an (2001), Beijing (2002), Chengdu (2003), Dalian (2004), Hangzhou (2005), Hong Kong (2006), Huangshan (2007), Zhangjiajie (2008), Suzhou (2009), Jiuzhaigou (2010), Wuhan (2011), Harbin (2012), Beidaihe (2013), Macau (2014), Qingdao (2015), and Nanchang (2016). Starting in 2017, the three conference committees agreed to launch a joint conference. The First APWeb-WAIM conference was held in Bejing (2017), the Second APWeb-WAIM conference was held in Macau (2018), the Third APWeb- WAIM conference was held in Chengdu (2019) and the Fourth APWeb-WAIM conference was held in Tianjin (2020). With the increased focus on big data, the new joint conference is expected to attract more professionals from different industrial and academic communities, not only from the Asia Pacific countries but also from other continents. APWeb-WAIM 2021 will enable you to enjoy an outstanding program, exchange your ideas with leading researchers in various disciplines, and make new friends in the international science community. Some highlights include four keynote talks on the latest exciting topics of Web and big data, ranging from the fundamental topic of core database systems to the fast-growing artificial intelligence applications; a diverse range of tutorials and workshops; technical sessions with exciting talks and demonstrations, and social events. We are grateful to the strong support of the Steering Committee of APWeb and WAIM, and we are honored to serve as General Chairs for such a unique joint conference. The conference would not have been possible without the dedication and the hard work of all members of the Organizing Committee. The Program Committee Chairs, Leong Hou U (University of Macau, China), Marc Spaniol (Université de Caen Normandie, France) and Yasushi Sakurai (Osaka University, Japan) put tremendous effort into the creation of an exciting program. Many other individuals and organizations contributed to the success of this conference. We would like to acknowledge the efforts of Workshop Chairs (Yunjun Gao, An Liu and Xiaohui Tao), Tutorial Chair (Raymond Chi-Wing Wong), Demo Chairs (Yanghui Rao), Industry Chair (Jianming Lv), Publication Chair (Junying Chen), Local Arrangement Chairs (Guohua Wang and Junying Chen) and Publicity Chairs (Xin Wang and Jianxin Li). In addition to members of the Organization Committee, many volunteers have contributed to the success of the conference. Volunteers helped in editing this conference booklet, and helped with conference arrangements and on-site setups, and many other important tasks. While it is difficult to list all their names here, we would like to take this opportunity to sincerely thank them all. Last but not least, we would like to extend our most sincere congratulations to all authors and speakers for a job well done. We look forward to welcoming you in person, and we hope that you will enjoy APWeb-WAIM 2021! General Chairs Yi Cai (South China University of Technology, China) Tom Gedeon (Australia National University, Australia) Qing Li (Hong Kong Polytechnic University, China) Baltasar Fernández Manjón (UCM, Spain) Welcome Message from the Program Committee Chairs On behalf of the APWeb-WAIM 2021 Program Committee, we are delighted to welcome you to the virtual conference! For more than 20 years in the past, Asia-Pacific Web (APWeb) and Web-Age Information Management (WAIM) have attracted professionals of different communities related to Web and big data who have common interests in interdisciplinary research to share and exchange ideas, experiences, and the underlying techniques and applications, including Web technologies, database systems, information management, software engineering, and big data. The technical program APWeb-WAIM 2021 features four keynotes by Prof. M. Tamer Özsu (David R. Cheriton School of Computer Science, University of Waterloo, Canada), Prof. Huan Liu (School of Computing and Augmented Intelligence, Arizona State University, USA), Prof. X. Sean Wang (School of Computer Science, Fudan University, China), Prof. Xiaokui Xiao (School of Computing, National University of Singapore, Singapore), as well as a tutorial by Prof. Hongzhi Wang (Harbin Institute of Technology, China) and Ph.D. Xiaoou Ding (Harbin Institute of Technology, China). We are grateful to these distinguished scientists for their invaluable contributions to the conference program. Our gratitude goes to Program Committee members and external reviewers whose technical expertise and dedication were not only thorough and crucial for the technical assessment of the selection of papers, but also inspirational in making the whole process even more pleasurable. During the double- blind review process, each paper submitted to APWeb-WAIM 2021 received at least three high quality review reports. Based on the obtained reviews, our Senior Program Committee members provided recommendations for each paper so that the difficult task of making decisions for acceptance could be performed. Finally, out of 184 submissions in total, the conference accepted 44 full research papers (23.91%), 24 short research papers, and 6 demonstration papers. The peer-review process and selection secure the quality of the publications. The contributed papers address a wide range of topics, such as storage and indexing, data mining, data management, graph data, neural network applications, machine learning, knowledge graph, text analysis, information extraction and retrieval, recommender system, social networks, spatial-temporal databases. Amongst a number of highly rated manuscripts, several candidates for best papers have been shortlisted for awards, where the final selection will be decided during the conference. In particular, we would like to thank Springer for its cash sponsorship of the APWeb-WAIM 2021 Awards. In addition to the main conference program, we would also like to thank Qingpeng Zhang (City University of Hong Kong, China) and Xin Wang (Tianjin University, China) for organizing The Fourth International Workshop on Knowledge Graph Management and Applications (KGMA 2021), Ge Yu (Northeastern University, China), Baoyan Song (Liaoning University, China), Xiaoguang Li (Liaoning University, China), Linlin Ding (Liaoning University, China), and Yuefeng Du (Liaoning University, China) for organizing The Third International Workshop on Semi-structured Big Data Management and Applications (SemiBDMA 2021), and Tae-Sun Chung (Ajou University, Korea), Jianming Wang (Tiangong University, China), and Zhetao Li (Xiangtan University, China) for organizing The Second International Workshop on Deep Learning in Large-scale Unstructured Data Analytics (DeepLUDA 2021), which are in conjunction with APWeb-WAIM 2021. We thank the General Co-Chairs Yi Cai (South China University of Technology, China), Tom Gedeon (Australia National University, Australia), Qing Li (Hong Kong Polytechnic University, China), and Baltasar Fernández Manjón (UCM, Spain) for their patience and especially thank for the support from the organizing team of Prof. Yi Cai. Yanchun Zhang represents the Steering Committee of APWeb and WAIM for guidance and advising. Many thanks also to all the members of the Organizing Committee for their full support in preparation of the conference, especially with respect to Website, publications, registration and local arrangements, without which the conference would not be possible to be put together. Finally, the