Databases in Networked Information Systems 7th International Workshop, DNIS 2011, Aizu-Wakamatsu, Japan, December 12-14, 2011. Proceedings - Kikuchi, Shinji; Madaan, Aastha; Sachdeva, Shelly; Bhalla, Subhash (Springer Berlin Heidelberg : Imprint: Springer, 2011)