This paper proposes a fuzzy temporal model named FITMod to be used as a basic framework to incorporate fuzzy time in temporal databases. The approach is based on Zadeh's fuzzy set and possibility theories, and discrete time and interval-based concepts. A construction called a temporal specification is introduced to represent temporal knowledge. Information in such a structure can be extracted by six primitive functions. The issue of incompleteness in temporal data is discussed. Alien's temporal relations are also studied in the domain of fuzzy temporal knowledge.
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