Semantic Data Management for db4o

Object databases such as db4o provide a very simple and eective way of making application objects persistent. However, they oer limited support for high-level database application programming in terms of facilities for the management of complex interrelated collections of data objects over long periods of time. Concepts of semantic data models such as role modelling, and associations are lacking and this results in a new impedance mismatch between the program and data models of the application. To address this problem, we have developed a semantic data management layer for db4o which supports role modelling, associations and a declarative query language.