PERD is constructed on the top of C-prolog running on the VAX11/780 UNIX.
It is an experimental vehicle to demonstrate the feasibility of RM/T which is one of the semantic data model and to apply the new concepts from the expert system and AI areas to the relational database system for knowledge base applications.
The main ideas of this thesis are the embedding of the executable code into the system catalogs for triggering and the realizations of the atomic semantics by the surrogate concept and the molecular semantics by the categorizations of the objects in DB.