Combining theory and practical knowledge, this guide is an essential companion to library and information specialists looking for an introduction to and solid grounding in aspects of new cataloguing theory, practice and trends.The book investigates the concepts of 'entity' and 'identity' in the field of cataloguing as a starting point for analysing and illustrating 'entity modelling' - an innovative contribution to third generation cataloguing, which involves Linked Open Data. Drawing on the history of cataloguing as well as elements of philosophy and computer science, the work sets out how to apply entity modelling in GLAM settings and facilitate communication and interoperability across the GLAM sector.Analysing a range of international case studies relating to specific bibliographic entries, readers will gain an in-depth understanding of the concepts and practices involved in entity modelling to transform cataloguing at their own libraries and institutions.