# Create tm:uncertainBeginning → time:DateTimeInterval → time:hasEnd →
# time:Instant with time:inXSDDate from tm:dateStartMax.

PREFIX tm:   <https://daniel.degu.cl/ontologies/theatre-migrants/>
PREFIX time: <http://www.w3.org/2006/time#>
PREFIX rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

INSERT {
  ?entity tm:uncertainBeginning ?interval .
  ?interval rdf:type time:DateTimeInterval .
  ?interval time:hasEnd ?instant .
  ?instant rdf:type time:Instant .
  ?instant time:inXSDDate ?date .
}
WHERE {
  ?entity tm:dateStartMax ?date .
  BIND(IRI(CONCAT(STR(?entity), "/uncertainBeginning")) AS ?interval)
  BIND(IRI(CONCAT(STR(?entity), "/uncertainBeginning/end")) AS ?instant)
}