The Database Language GEM.

Carlo Zaniolo: The Database Language GEM. SIGMOD Conference 1983: 207-218

@inproceedings{DBLP:conf/sigmod/Zaniolo83,
  author    = {Carlo Zaniolo},
  editor    = {David J. DeWitt and
               Georges Gardarin},
  title     = {The Database Language GEM},
  booktitle = {SIGMOD'83, Proceedings of Annual Meeting, San Jose, California,
               May 23-26, 1983},
  publisher = {ACM Press},
  year      = {1983},
  pages     = {207-218},
  ee        = {http://doi.acm.org/10.1145/582192.582226, db/conf/sigmod/Zaniolo83.html},
  crossref  = {DBLP:conf/sigmod/83},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

GEM (an acronym for General Entity Manipulator) is a general-purpose query and update language for the DSIS data model, which is a semantic data model of the Entity-Relationship type. GEM is designed as an easy-to-use extension of the relational language QUEL, providing support for the notions of entities with surrogates, aggregation, generalization, null values, and set-valued attributes.

Copyright © 1983 by the ACM, Inc., used by permission. Permission to make digital or hard copies is granted provided that copies are not made or distributed for profit or direct commercial advantage, and that copies show this notice on the first page or initial screen of a display along with the full citation.

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David J. DeWitt, Georges Gardarin (Eds.): SIGMOD'83, Proceedings of Annual Meeting, San Jose, California, May 23-26, 1983. ACM Press 1983

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References

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[SiKE]: ...
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[Tsur]: ...
[TsZa]: Shalom Tsur, Carlo Zaniolo: An Implementation of GEM - Supporting a Semantic Data Model on a Relational Back-End. SIGMOD Conference 1984: 286-295
[Ullm]: ...
[Zani1]: Carlo Zaniolo: Database Relations with Null Values. PODS 1982: 27-33
[Zani2]: ...
[Zani3]: ...