The book uses a comprehensive theoretical framework for examining the theories of knowledge organization, the structural principles in knowledge organization, and the impacts of these theories and principles in the construction of knowledge organization systems (KOSs). A very unique component of the book is its coverage of the Semantic Web and linked data in the context of the representation of knowledge organization structures, including convincing cases and examples, as well as the issues and progress of fundamental and advanced applications. The range and scope of the book present a state- of-the-art review of the whole domain of knowledge organization.