Frames, Objects and Relations: Three Semantic Levels for Knowledge Base Systems.

We propose an architecture for large-scale knowledge base systems based on database technologies and the three levels of semantic construct-frames, objects and relations. The intermediate object level retains the structural semantics of the frame level and is therefore beneecial in bridging the semantic gap between the frame and re-lational levels and enabling the use of semantic information in query optimisation. Speciically, we outline how this approach has been adopted in the hybrid knowledge base system, HYWIBAS.