The workshop took place on the 26^th and 27^th of September 2017 at the Deutsche Nationalbibliothek (DNB) in Frankfurt am Main, Germany. It was arranged by the Nordic Network Group on bibliographic and infrastructure topics (NNG) and the Organizer Group in close cooperation with the DNB. The next European workshop will take place in autumn 2018 at Casalini Libri in Florence, Italy.