crm:P4_has_time-span leaf node

@prefix crm: <http://www.cidoc-crm.org/cidoc-crm/> .
@prefix ecrm: <http://erlangen-crm.org/current/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

crm:P4_has_time-span a owl:ObjectProperty ;
    rdfs:label "P4 has time-span"@en ;
    rdfs:comment """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)"""@en ;
    rdfs:domain crm:E2_Temporal_Entity ;
    rdfs:range crm:E52_Time-Span ;
    owl:equivalentProperty ecrm:P4_has_time-span ;
    owl:inverseOf crm:P4i_is_time-span_of ;
    skos:notation "P4"^^xsd:string .