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 {
   _:teachingActivity rdf:type core:TeachingActivity .
   _:teachingActivity rdfs:label ?teachingFocus .
   _:teachingActivity rdf:type ?flag .
   ?s core:hasTeachingActivity _:teachingActivity .
} WHERE {
   ?s core:teachingFocus ?teachingFocus 
   OPTIONAL {
      ?s rdf:type ?flag
      FILTER (regex(str(?flag),"http://vitro.mannlib.cornell.edu/ns/vitro/0.7#Flag1"))
   }
}