This book presents a deep, philosophical investigation into the somewhat elusive notion of entity modelling as applied in cataloguing practice. It convincingly demonstrates how issues grappled with in everyday bibliographical work lead back to the age-old, big questions of being and identity, and by that, enables readers to form independent thoughts on practical solutions. Anyone intrigued by the conceptual underpinnings of bibliographical work cataloguers and terminologists alike should read this book. So should anyone dismissing cataloguing as a mere mechanical activity. -- Oddrun Pauline Ohren, Metadata Specialist, National Library of Norway This book is a welcome deep dive into the background and impact of a paradigm shift in standards for bibliographic metadata concepts and content. -- Gordon Dunsire, retired, recipient of the IFLA Medal 2016 for 'enhancing the field of bibliographic data, linked data and the semantic web' This book with its essential and extensive introductory essays is a concise, yet complex, description of the most advanced state at the present time of cataloging, and thus discovery, for library collections using Linked Open Data, of which BIBFRAME is a variant. Entity Modelling demonstrates the progress made to a theoretical construct for the new and more flexible approach to library cataloging that is also apropos to cataloging and thus discovery in other cultural heritage organizations, especially museums, for their collections whether virtual or analog or both. Entity Modelling is highly endorsed! -- Michael A. Keller, Vice Provost and University Librarian, Stanford University