ORION was a prototype OODBMS developed at MCC, an American consortium by Won Kim and his group. Won Kim has left MCC and formed a new company, UniSQL, in Austin, with a new product of the same name.
See also entry under "ITASCA".
I have found nearly a dozen papers published by the ORION folks. Overviews at various stages in its development and commercialization can be found in:
[KBGW91] Won Kim, N. Ballou, J.F. Garza, and D.; Woelk. A distributed object-oriented database system supporting shared and private databases. ACM Transactions on Information Systems, 9(1):31--51, January 1991.
[KGBW90] W. Kim, J.F. Garza, N. Ballou, and D. Woelk. Architecture of the orion next-generation database system. IEEE Transactions on Knowledge and Data Engineering, 2(1):109--24, March 1990.
[KBCG89] Won Kim, Nat Ballou, Hong-Tai Chou, and Darrell Garza, Jorge F. Woelk. Features of the ORION object-oriented database system. In Won. Kim and Frederick H. Lochovsky, editors, Object-Oriented Concepts, Databases and Applications, chapter 11. Addison-Wesley, Reading, MA, 1989.
[KBC+88] Won Kim, N. Ballou, Hong-Tai Chou, J.F. Garza, D. Woelk, and J. Banerjee. Integrating an object-oriented programming system with a database system. In Proceedings of the ACM Conference on Objected-Oriented Programming: Systems, Languages and Applications (OOPSLA), pages 142--152, San Diego, CA, September 1988. Published as ACM SIGPLAN Notices 23(11). [Pointers to the previous papers documenting each of the advanced features listed above are cited therein.]
The paper most relevant to the issue of schema evolution is the following:
[BKKK87] J. Banerjee, W. Kim, H-J. Kim, and H.F. Korth. Semantics and implementation of schema evolution in object-oriented databases. In U. Dayal and I. Traiger, editors, Proceedings of the SIGMOD International Conference on Management of Data, San Francisco, CA, May 1987.
You might also like to look at Kim's book, which provides a good introduction to OODBMS, while focusing on the ORION work:
[Kim90] Won Kim. Introduction to Object-Oriented Databases. Computer Systems. MIT Press, Cambridge, MA, 1990.
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