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Valid-time indeterminacy

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2 Author(s)
Dyreson, C.E. ; Dept. of Comput. Sci., Arizona Univ., Tucson, AZ, USA ; Snodgrass, R.T.

In valid-time indeterminacy, it is known that an event stored in a temporal database did in fact occur, but it is not known exactly when the event occurred. An extension of the tuple-timestamped temporal data model, called the possible chronons data model, is presented to support valid-time indeterminacy. In the possible chronons data model, each event is represented with a set of possible chronons, delimiting when the event might have occurred and a probability distribution over the set. The TQuel query language is extended using constructs that specify the user's credibility in the underlying valid-time data and the user's plausibility in the relationships among that data. A formal tuple calculus semantics is outlined, and it is shown that this semantics reduces to the determinate semantics on determinate data

Published in:

Data Engineering, 1993. Proceedings. Ninth International Conference on

Date of Conference:

19-23 Apr 1993

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