Research and Practical Issues of Enterprise Information by Dianxun Shuai, Qing Shuai, Liangjun Huang (auth.), A. Min

By Dianxun Shuai, Qing Shuai, Liangjun Huang (auth.), A. Min Tjoa, Li Xu, Sohail S. Chaudhry (eds.)

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Extra resources for Research and Practical Issues of Enterprise Information Systems: IFIP TC 8 International Conference on Research and Practical Issues of Enterprise Information Systems (CONFENIS 2006) April 24–26, 2006, Vienna, Austria

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Furthermore, in order to keep information about these new features, we has to reformulate several structures, since the parsing process results in a binary parse tree of scalar expression objects, each of them having the required metadata to create the equivalent spatial and non-temporal SQL statements. This metadata is used by the Translator module, responsible for mapping temporal algebra into snapshot equivalent algebra. This module has also several changes in order to accommodate the proper management of spatial columns (Section 5) by temporal operators and the correct translation of spatial projection and spatial selection operators.

127-146. 11. M. Bohlen, Temporal Database System Implementations, SJGMOD Record 24(4), (1995). 12. C. Medeiros, F. Pires, Databases for GIS, SIGMOD 23(1), (1994). 13. C. Vassilakis, P. Georgiadis, A. Sotiropoulou, A Comparative Study of Temporal DBMS Architectures, DEXA, 1996, pp. 153-164. 14. K. Torp, C. Jensen, M. Bohlen, Layered Implementation of Temporal DMBSs - Concepts and Techniques, Time Center Technical Report, 1997. 15. J. Allen, Maintaining Knowledge about Temporal Intervals, Communications of the ACM 16(11), 832-843 (1983).

12 Research and Practicial Issues of Enterprise Information Systems when there is the need to capture the evolution of facts over the time. To overcome this limitation, that is, to manage temporal aspects of facts in databases, Date [0] considers two distinct approaches: the semi-temporal approach, where the representation of historical data is done with timestamps, and the full-temporal approach, where the database must record the time when a fact is current in the reality - represented as an interval or a period - and in some application domains, must keep record of the time when a fact is current in the database.

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