A Hierarchical Knowledge Framework for Digital Twins of Buildings and Their Energy Systems (Position Paper). - James Allan; Edrisi Munoz; Sergio Acero González; Hassan Bazazzadeh; Federica Bellizio; Hanmin Cai; Reto Fricker; Philipp Heer; Mina Montazeri; Sascha Stoller; Georgios Mavromatidis (CAiSE Workshops, 2024)