"P4"^^ . . . . "Scope note:\nThis property describes the temporal confinement of an instance of an E2 Temporal Entity.\n\nThe 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.\n\nExamples:\n- the Yalta Conference (E7) has time-span Yalta Conference time-span (E52)\n\nIn First Order Logic:\nP4(x,y) \u2283 E2(x)\nP4(x,y) \u2283 E52(y)"@en . . "P4 has time-span"@en .