The entity-relationship model—toward a unified view of data
ACM Transactions on Database Systems (TODS) - Special issue: papers from the international conference on very large data bases: September 22–24, 1975, Framingham, MA
Database abstractions: aggregation and generalization
ACM Transactions on Database Systems (TODS)
Logic and Databases: A Deductive Approach
ACM Computing Surveys (CSUR)
A relational model of data for large shared data banks
Communications of the ACM
An implementation of GEM: supporting a semantic data model on a relational back-end.
SIGMOD '84 Proceedings of the 1984 ACM SIGMOD international conference on Management of data
KPSP: A Knowledge Programming System based on Prolog
Proceedings of the Fourth International Conference on Entity-Relationship Approach
Globe-Trotter: An Intelligent Flight Itinerary Planner
IEEE Expert: Intelligent Systems and Their Applications
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This paper presents an approach to extending the relational system RTMS into one supporting a frame-based knowledge-representation system. A deductive front-end is used for extraction of implicit information from the explicit data stored in RTMS. The proposed extensions to the relational model include the relationships of aggregation and generalization, set-valued attributes, and virtual relations defined using axioms. We will present a query language that takes advantage of these extensions. A user can make a query against virtual relations as well as base relations. The queries can consist of new constructs introduced by the semantic front-end. The system is implemented on TI's Explorer Lisp Machine.