Telic Distinction in Temporal Databases
Point- versus period-based semantics
Downward inheritance. The downward inheritance property implies that one can infer from temporal data d that holds at valid time t (where t is a time period) that d holds in any sub-period (and sub-point) of t.
Upward inheritance. The upward inheritance property implies that one can infer from temporal data d that holds at two consecutive or overlapping time periods t1 and t2 that d holds in the union time period t1 ∪t2.
In temporal databases, the semantics of atelic data implies that both downward and upward inheritance holds; on the other hand, neither downward nor upward inheritance holds for telic data.
The distinction between telic and atelic facts dates back to Aristotle’s categories  and...
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