This book constitutes the refereed proceedings of the 4th European Semantic Web Conference, ESWC 2007, held in Innsbruck, Austria, in June 2007.The 46 revised full papers presented together with 4 invited talks and 10 system descriptions were carefully reviewed and selected from a total of 278 submitted papers. The papers are organized in topical sections on semantic Web services, ontology learning, inference and mapping, case studies, social semantic Web, ontologies: requirements and analysis, personalization, foundations of the semantic Web, natural languages and ontologies, applications, querying and Web data models, as well as system descriptions.
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