This book provides a comprehensive introduction to the foundations of Semantic Web technologies. It is designed for university courses and self-study, and is suitable for researchers and practitioners. The book is based on five years of teaching experience and covers the essential concepts and technologies of the Semantic Web. It includes detailed explanations of the formal semantics of major foundational languages for the Semantic Web, such as RDF and OWL, as well as the upcoming W3C recommended standards OWL 2 and RIF. The book also covers advanced topics such as rules and rule languages, query languages, and ontology engineering. It includes exercises and solutions, as well as references for further reading. The book is structured into five parts: Resource Description Language RDF, Web Ontology Language OWL, Rules and Queries, Beyond Foundations, and Appendices. Each chapter provides an overview of the content and significance, and includes references for further reading. The book is intended for students, researchers, and practitioners in the field of Semantic Web technologies. It provides a thorough understanding of the fundamental concepts and technologies of the Semantic Web, as well as the advanced topics that are essential for further study and application. The book is written in a clear and accessible manner, making it suitable for both beginners and advanced readers. It includes a comprehensive index at the end of the book for quick lookup of definitions and keywords. The book is accompanied by an online resource that provides updates, errata, slides, and links to further resources. The authors of the book are well-regarded researchers and teachers in the field of Semantic Web technologies. They have extensive experience in teaching and research, and their work has contributed to the development of Semantic Web technologies. The book is a valuable resource for anyone interested in the Semantic Web, whether for academic study or practical application.This book provides a comprehensive introduction to the foundations of Semantic Web technologies. It is designed for university courses and self-study, and is suitable for researchers and practitioners. The book is based on five years of teaching experience and covers the essential concepts and technologies of the Semantic Web. It includes detailed explanations of the formal semantics of major foundational languages for the Semantic Web, such as RDF and OWL, as well as the upcoming W3C recommended standards OWL 2 and RIF. The book also covers advanced topics such as rules and rule languages, query languages, and ontology engineering. It includes exercises and solutions, as well as references for further reading. The book is structured into five parts: Resource Description Language RDF, Web Ontology Language OWL, Rules and Queries, Beyond Foundations, and Appendices. Each chapter provides an overview of the content and significance, and includes references for further reading. The book is intended for students, researchers, and practitioners in the field of Semantic Web technologies. It provides a thorough understanding of the fundamental concepts and technologies of the Semantic Web, as well as the advanced topics that are essential for further study and application. The book is written in a clear and accessible manner, making it suitable for both beginners and advanced readers. It includes a comprehensive index at the end of the book for quick lookup of definitions and keywords. The book is accompanied by an online resource that provides updates, errata, slides, and links to further resources. The authors of the book are well-regarded researchers and teachers in the field of Semantic Web technologies. They have extensive experience in teaching and research, and their work has contributed to the development of Semantic Web technologies. The book is a valuable resource for anyone interested in the Semantic Web, whether for academic study or practical application.