Temporal Representation and Reasoning, International Syposium on (2002)
July 7, 2002 to July 9, 2002
Elena Camossi , Università di Milano
Elisa Bertino , Università di Milano
Giovanna Guerrini , Università di Pisa
Marco Mesiti , Università di Genova
The main key feature of temporal databases is to maintain all values taken by object attributes over time. Since historical information may be needed at different levels of detail, multigranular temporal databases have been introduced, in which different attributes can be stored at different temporal granularities. An important issue that has not been addressed, however, is that the required level of detail does not only depend on attribute semantics, rather it is often related to how recent data are. It is quite natural that recent data are needed at greater level of detail, whereas less detail is needed as data age. As an extreme case, data can also expire, that is, they are no longer needed after a certain period of time. In this paper we address the problem of evolution and expiration of historical data in a multigranular temporal object model.
E. Camossi, M. Mesiti, G. Guerrini and E. Bertino, "Evolution Specification of Multigranular Temporal Objects," Proceedings Ninth International Symposium on Temporal Representation and Reasoning(TIME), Manchester, UK, 2002, pp. 78.