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Nowadays, increasing needs for information sharing arise due to extensive collaborations among organizations. Organizations desire to provide data access to their collaborators while preserving full control over the data and comprehensive privacy of their users. A number of information systems have been developed to provide efficient and secure information sharing. However, most of the solutions proposed so far are built atop of conventional data warehousing or distributed databasedoi:10.1007/978-3-642-03354-4_9 fatcat:isyzaumzsvg6xge52zirw4e6ca