The semantic web: ESWC 2021 Satellite Events virtual event, June 6-10, 2021 : revised selected papers - Verborgh, Ruben ca. 20./21. Jh; Dimou, Anastasia; Hogan, Aidan; D'Amato, Claudia; Tiddi, Ilaria; Bröring, Arne; Mayer, Simon; Ongenae, Femke; Tommasini, Riccardo; Alam, Mehwish (Springer, 2021)