Web information systems and applications : 19th International Conference WISA 2022 Dalian China September 16 18 2022 proceedings This book constitutes the proceedings of the 19th International Conference on Web Information Systems and Applications WISA 2022 held in Dalian China in September 2022.The 45 full papers and 19 short papers presented were carefully reviewed and selected from 212 submissions. The papers are grouped in topical sections on knowledge graph natural language processing world wide web machine learning query processing and algorithm recommendation data privacy and security and blockchain