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Variable Independence and Aggregation Closure., , and . PODS, page 40-48. ACM Press, (1996)Generalized XML security views., , and . Int. J. Inf. Sec., 8 (3): 173-203 (2009)On the Complexity of Queries in the Logical Data Model., and . Theor. Comput. Sci., 116 (1): 33-57 (1993)preliminary version: ICDT 1988: 267-280.Structural properties of XPath fragments., , and . Theor. Comput. Sci., 336 (1): 3-31 (2005)On the Complexity of Queries in the Logical Data Model (Extended Abstract)., and . ICDT, volume 326 of Lecture Notes in Computer Science, page 267-280. Springer, (1988)In Memoriam Paris C. Kanellakis., , , , and . ACM Comput. Surv., 28 (1): 3-15 (1996)A unified constraint model for XML., , and . Comput. Networks, 39 (5): 489-505 (2002)Asking and Answering Queries Semantically., , and . WOA, page 22-27. Pitagora Editrice Bologna, (2005)Queries and Updates in the coDB Peer to Peer Database System., , , and . VLDB, page 1277-1280. Morgan Kaufmann, (2004)Tractable Recursion over Geometric Data., and . CP, volume 1330 of Lecture Notes in Computer Science, page 450-462. Springer, (1997)