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Valid-Time Indeterminacy in Temporal Relational Databases: Semantics and Representations
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DOI：10.1109/TKDE.2012.199.png)
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Abstract
En 中文
Valid-time indeterminacy is don't know when indeterminacy, coping with cases in which one does not exactly know when a fact holds in the modeled reality. In this paper, we first propose a reference representation (data model and algebra) in which all possible temporal scenarios induced by valid-time indeterminacy can be extensionally modeled. We then specify a family of 16 more compact representational data models. We demonstrate their correctness with respect to the reference representation and analyze several properties, including their data expressiveness. Then, we compare these compact models along several relevant dimensions. Finally, we also extend the reference representation and a representative of compact representations to cope with probabilities.
Keywords:
Temporal databases
artificial intelligence
database design
modeling and management
knowledge representation formalisms and methods
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