Often a user knows only approximately when an event happened. For instance, she may know that it happened “between 2 PM and 4 PM,” “sometime in the first week of June, ” or “around the middle of the August. ” These are examples of temporal indeterminacy. Information that is temporally indeterminate can be characterized as “don’t know when” information, or more precisely, “don’t know exactly when” information. This kind of information has various sources, including the following.
KeywordsMass Function Probability Mass Function Select Statement Valid Time Temporal Element
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