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About: P4 has time-span


an Entity references as follows:

Scope note: This property describes the temporal confinement of an instance of an E2 Temporal Entity. The related E52 Time-Span is understood as the real Time-Span during which the phenomena were active, which make up the temporal entity instance. It does not convey any other meaning than a positioning on the "time-line" of chronology. The Time-Span in turn is approximated by a set of dates (E61 Time Primitive). A temporal entity can have in reality only one Time-Span, but there may exist alternative opinions about it, which we would express by assigning multiple Time-Spans. Related temporal entities may share a Time-Span. Time-Spans may have completely unknown dates but other descriptions by which we can infer knowledge. Examples: - the Yalta Conference (E7) has time-span Yalta Conference time-span (E52) In First Order Logic: P4(x,y) ⊃ E2(x) P4(x,y) ⊃ E52(y)

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