Object oriented database subsystem for CAD frameworks

This thesis describes the research and design of a new CAD framework and implements a working prototype of the system.The strengths and weaknesses of some existing systems and the needs of modern tool development are described. An architecture is defined.The architecture uses object oriented programming methods and is implemented using the "C++" language on workstations running the UNIX operating system.This thesis describes the basis of an object oriented server and a base class library to be used by the client applications to obtain object persistence, transparent access to multiple servers, version control, rich modeling capabilities and operations in a heterogeneous network of workstations.There is also a discussion of methods for implementing advanced features like notification and project and version management.Finally, the working prototype is evaluated and the results show that with some performance improvements, the system could be used as a foundation for a highly versatile and expandable CAD framework