Modeling of the consistency problem in object-oriented database

The problem of how to maintain the consistent state of a database is one of the important issues in the research of database area. There have been several researches aimed at this problem for relational database since two decades ago. But for object-oriented database, which has more complex structure than relational database, there is a need to have a more general framework to discuss this problem from additional aspects in more elaborate manner. The purpose of this paper is to propose a theoretical model, including various aspect of consistency, the methods of checking consistency, and how to enforce consistency in object-oriented database