Figures and Tables About the Author Prologue by Philip E. Schreur Foreword by Carlo Bianchini Foreword by Maurizio Vivarelli Introduction by Mauro Guerrini: Entity Modelling or Rather, the Next Generation of Cataloguing Acknowledgements List of Acronyms The Context The theme\ The historical context\ The state of the art\ Research sources and articulation of the work 1. I Contain Multitudes Introduction\ Questions to resolve\ Entity and Identity\ Diachronic and synchronic identities in the bibliographic universe\ Conclusions on the concepts of entity and identity 2. The World is My Representation Introduction\ On the record: the declaration of a new course to adapt to the language of the web\ What is a real-world object?\ Entity resolution and entity modelling\ Conclusions on the transition from record to entity modelling 3. Panta Rei, or the Fluidity of the Universe Introduction\ The entity as a prism\ Capturing things in change\ Examples of emerging entities in cataloguing\ The transience of intrinsic properties, the persistence of relational properties\ Conclusions on change and persistence 4. O Romeo, Romeo, Wherefore Art Thou Romeo? Introduction\ The agent in cataloguing tradition\ The treatment of popes in cataloguing tradition\ Identifying entities and identities through URIs\ Conclusions on entity modelling and the significance of changing collective mindsets\ Final reflections Appendix: Attributes of the entity svde:opus and svde:work Endnotes Bibliography Index.