Treffer: OMS/Java: Model Extensibility of OODBMS for Advanced Application Domains

We show how model extensibility of object-oriented data management systems can be achieved through the combination of a highlevel core object data model and an architecture designed with model extensibility in mind. The resulting system, OMS/Java, is both a general data management system and a framework for the development of advanced database application systems. All aspects of the core model -- constructs, query language and constraints -- can easily be generalised to support, for example, the management of temporal, spatial and versioned data. Specifically, we show how the framework was used to extend the core system to a temporal object-oriented database management system. 1 Introduction Extensibility has often been considered a purely architectural issue in database management systems (DBMS). In the 1980s, there was an increase in the various forms of DBMS that appeared --- many of which were tailored to specific application domains such as Geographical Information Systems or C.