Web and Big Data APWeb-WAIM 2019 International Workshops, KGMA and DSEA, Chengdu, China, August 1-3, 2019, Revised Selected Papers - Song, Jingkuan; Song, Jingkuan; Zhu, Xiaofeng; Zhu, Xiaofeng (Springer International Publishing : Imprint: Springer, 2019)