Federated database systems for managing distributed, heterogeneous, and autonomous databases
ACM Computing Surveys (CSUR) - Special issue on heterogeneous databases
Reflective programming in the relational algebra
Journal of Computer and System Sciences
Typed query languages for databases containing queries
Information Systems
VLDB '00 Proceedings of the 26th International Conference on Very Large Data Bases
SIT-IN: a Real-Life Spatio-Temporal Information System
Proceedings of the 27th International Conference on Very Large Data Bases
Meta-Data Based Mediator Generation
COOPIS '98 Proceedings of the 3rd IFCIS International Conference on Cooperative Information Systems
Querying multidimensional data
Multidimensional databases
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The Italian National Statistics Institute is currently integrating its various spatio-temporal data collections. It has been developed an integrated system, whose implementation relied on Web and relational technologies to cope with data heterogeneity. The system provides users with many different classes of functions with which to analyse and visualise territorial data. It can be viewed as a spatio-temporal data warehouse, where space and time are the main access dimensions to statistical data, but also where space can be analysed according to its temporal mutations as a preliminary step in the design activity of a statistical survey. The system overcomes a drawback of current commercial data warehouse systems, which are not able to cope with the dynamic behaviour of a dimension - that is, its temporal evolution.