... created,with virtual databases taking other virtual databases as inputs.While the focus in this document is on federating structured data held in databases,Section 14.4 also identified the requirement ... Publishers.2. Hillmann D. (2001) Using Dublin core, Dublin Core Metadata Initiative,dublincore.org/documents/usageguide.3. Lassila, O. and Swick, R. (1999) Resource Description Framework (RDF) Model...