Modeling time: Adequacy of three distinct time concepts for temporal databases
In this paper we present newly elaborated time concepts for precise and lossless information preservation in temporal databases. First we introduce notions of temporal validity and interpretation-based validity, which help us correctly understand various time concepts introduced earlier for temporal databases. We, then, discuss the problem of preserving multiple past states of a temporal database and argue that three time concepts, valid time, transaction time, and event time are needed to attain the preservation. Lastly a simple and effective representation of temporal information with two-dimensional time is introduced.
KeywordsError Correction Event Time Valid Period Valid Time Temporal Database
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