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“This book provides a comprehensive reference for Object Relationship Notation (ORN), a declarative extension that adds referential actions to UML multiplicities for the conceptual modeling of relationships in database applications. The book is intended as a text for a broad audience including researchers, developers of DBMSs and data modeling tools, database practitioners, and students. … Throughout this book many examples are provided and allow for a very good understanding of the covered material. … To summarize, I recommend this book as a reference for ORN.” (Gottfried Vossen, Zentralblatt MATH, Vol. 1185, 2010)