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Schema evolution support is an important facility for object-oriented database (OODB) systems. While existing OODB systems provide for limited forms of evolution, including modiication to the database schema and reorganization of aaected instances, we nd their support insuucient. Speciic deeciencies are 1) the lack of compatibility support for old(More)
NOTICE WARNING CONCERNING COPYRIGHT RESTRICTIONS: The copyright law of the United States (title 17, U.S. Code) governs the making of photocopies or other reproductions of copyrighted material. Any copying of this document without permission of its author may be prohibited by law. Abstract We present an overview of the novel aspects of Avaion/Common Lisp:(More)
Providing support forschema evolution allows existing databases to be adjusted for varying roles over time. This paper reflects on existing evolution support schemes and introduces a more general and functional mechanism to support schema evolution andinstance adaptation for centralized and distributed object-oriented database systems. Our evolution support(More)
SUMMARY Algorithmic presentations are given for three calendars of historical interest, the Mayan, French Revolutionary, and Old Hindu. From a chronological point of view the substitution for the mean calendaric system of one based on the true movements of the sun and moon, was anything but an improvement, as it destabilized the foundations of the time(More)
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