Mapping: crm:P4_has_time-span should refer to a E52_Time-Span resource

[azaroth42]

For example, in the record here: https://stad.gent/data/tentoonstelling/530003726/2023-01-06T17:19:55.023Z P4 refers to an EDTF literal string, rather than a TimeSpan entity.

For reference, the documentation for P4 is here: https://cidoc-crm.org/html/cidoc_crm_v7.1.2.html#P4

For this record (2020-03-13/2020-09-03), by way of example, it could be instead:

{
 "@type": "crm:E52_Time-Span",
 "crm:P82a_begin_of_the_begin": "2020-03-13T00:00:00Z",
 "crm:P81a_end_of_the_begin": "2020-03-13T23:59:59Z",
 "crm:P81b_begin_of_the_end": "2020-09-03T00:00:00Z",
 "crm:P82b_end_of_the_end": "2020-09-03T23:59:59Z"
 "crm:P1_is_identified_by": [{
    "@type": "crm:E41_Appellation",
    "crm:P190_has_symbolic_content": "2020-03-13/2020-09-03"
 }]
}

In Linked Art, we describe the time span pattern here: https://linked.art/model/base/#time-span-details

Thank you!

@brechtvdv introduced me to the work via the LDES stream, and we would like to reuse it as part of a data-oriented exhibition research project using CRM and NLP over exhibition catalog texts.