Metadata Definition in Registries: What Is a Data Element? - Jürgen Stausberg; Sonja Harkener; Markus Burgmer; Christoph Engel; Robert Patrick Finger; Carsten Heinz; Ekkehart Jenetzky; David Martin; Rüdiger Rupp; Martin Schönthaler; Christian Schuld; Barbara Suwelack; et al. (MIE, 2022)