First, we have studied new consistency criteria that are suitable in the global environment. An IIS administrator may choose a global correctness criterion based on the consistency requirements on the global level. In an extension of PSR, different users working in the same environment may even choose different correctness criteria. Meanwhile, we are investigating the possibility for the different component transaction management subsystems to co-exist and the possible consistency level that can be guaranteed in the global environment. In our approach, transactional behavior of component systems is encapsulated and exported to the global environment.
Encapsulated behavior allows certain degree of context-based polymorphism.
The global level consistency can be derived from the exported behavior. For more information of the above and other research activities in the IIS project, please contact the people responsible for the subprojects. 20, No. 2, Dec. 1991. R. Karlsen, Flexible Transaction Management in Federated Database Systems, Ph.D. theses, Department of Computer Science, University of Troms , 1995. Springer-Verlag Singapore Pte. Ltd., 1997.