PREFIX rdf:   <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs:  <http://www.w3.org/2000/01/rdf-schema#>
PREFIX xsd:   <http://www.w3.org/2001/XMLSchema#>
PREFIX owl:   <http://www.w3.org/2002/07/owl#>
PREFIX swrl:  <http://www.w3.org/2003/11/swrl#>
PREFIX swrlb: <http://www.w3.org/2003/11/swrlb#>
PREFIX vitro: <http://vitro.mannlib.cornell.edu/ns/vitro/0.7#>
PREFIX vivo:  <http://vivo.library.cornell.edu/ns/0.1#>
PREFIX bibo: <http://purl.org/ontology/bibo/>   
PREFIX dcterms: <http://purl.org/dc/terms/>
PREFIX event: <http://purl.org/NET/c4dm/event.owl#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
PREFIX core: <http://vivoweb.org/ontology/core#>

Construct {
     _:dtv a core:DateTimeValue .
     _:dtv core:dateTime ?theDate .
     _:dtv core:dateTimePrecision core:yearPrecision .
     ?thing core:dateTimeValue _:dtv .
} where {
     ?thing core:year ?theDate .
     
     Optional {
       ?thing a ?ettype .
       ?thing a core:EducationalTraining
     }     
     
     Optional {
       ?thing a ?prtype .
       ?thing a core:PresenterRole
     }     
     
     FILTER (!bound(?ettype))
     FILTER (!bound(?prtype)) 
}