This book presents thoroughly arranged tutorial papers corresponding to lectures given by leading researchers at the Second International Summer School on Reasoning Web in Lisbon, Portugal, in September 2006.

Building on the predessor school held in 2005 and published as LNCS 3564, the ten tutorial lectures presented provide competent coverage of current topics in semantic Web research and development. The lectures are organized in topical sections on semantic Web query languages; semantic Web rules and ontologies; bioinformatics and medical ontologies and industrial aspects.