Semantic Web combines the descriptive languages RDF (Resource Description Framework) and OWL (Web Ontology Language), with customized data-centric XML (eXtensible Mark-up Language) to provide a description of the contents of web documents. Semantic Web Technologies provides a comprehensive overview of key semantic knowledge technologies and research. The next chapters examine how Semantic Web technologies are being applied in knowledge management (Semantic Information? Access?) and in the next generation of Web services. Semantic Web Technologies: Provides a comprehensive exposition of - the state of art in Semantic Web research and key technologies. Advanced undergraduate and graduate students, academic and industrial researchers in the field will all find Semantic Web Technologies is an essential guide to Semantic Web technologies.