# Create tm:uncertainBeginning → time:DateTimeInterval → time:hasBeginning →
# time:Instant with time:inXSDDate from tm:dateStartMin.

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:hasBeginning ?instant .
  ?instant rdf:type time:Instant .
  ?instant time:inXSDDate ?date .
}
WHERE {
  ?entity tm:dateStartMin ?date .
  BIND(IRI(CONCAT(STR(?entity), "/uncertainBeginning")) AS ?interval)
  BIND(IRI(CONCAT(STR(?entity), "/uncertainBeginning/begin")) AS ?instant)
}