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An Implementation of GEM -- supporting a semantic data model on a relational back-end.

By Shalom Tsurl Carlo and Carlo Zanrolo


Ths paper presents a stmple approach for extendmg the relattonal system INGRES rate one supporting a semanttc data model It describe a DBMS conststmg of O) a user-friendly front-end, supportmg the GEM semanttc data model and query language under the UNIX' tme-sharmg system, and (u) a dedtcated back-end processor provtdmg efSctent support for database transacttons, concurrency control and recovery GEM extends the relattonal model to support the nottons of enttttes wtth surrogates, the relattonshtps of aggregabon and generahzatton, null values and set-valued attributes, and provtdes stmple extenstons of QUEL to handle these new constructs In thts proposed tmplementatton of GEM, the relabonal database processor IDM 500 by Bntton-Lee ts used as the back-end machme

Year: 1984
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