Extending the database relational model to capture more meaning
ACM Transactions on Database Systems (TODS)
Database abstractions: aggregation and generalization
ACM Transactions on Database Systems (TODS)
On the semantics of the relational data model
SIGMOD '75 Proceedings of the 1975 ACM SIGMOD international conference on Management of data
The semantic data model: a modelling mechanism for data base applications
SIGMOD '78 Proceedings of the 1978 ACM SIGMOD international conference on management of data
Principles of Database Systems
Principles of Database Systems
AQL - A Relational Data Base Management System and its Geographical Applications
Proceedings on Data Base Techniques for Pictorial Applications
An overview of Knowledge Representation
Proceedings of the 1980 workshop on Data abstraction, databases and conceptual modeling
Data abstraction, data bases and conceptual modelling (Position Paper)
Proceedings of the 1980 workshop on Data abstraction, databases and conceptual modeling
Meta-database architecture for relational DBMS
ACM SIGMOD Record
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System/K is a Knowledge Base Management System designed to offer a set of facilities for knowledge representation and usage at the conceptual level by means of three descriptive mechanisms ("Aggregate", "derive", and "Collect"). Two specific object-types (Assertions and Sets) are defined to represent the "part-of", "is-a" and "member-of" relationships. An "object-Oriented" cross-reference logic is defined, that saves users from having to be constantly aware of "keys". System/K refers to SQL/DS (a relational DBMS) to maintain information concerning both the conceptual relationships (meta-database) and the description of the entities in the real world (database).A logic is defined to generate the appropriate relation schemes starting from the conceptual definitions.