PREFIX arg: <http://purl.obolibrary.org/obo/> 
PREFIX foaf: <http://xmlns.com/foaf/0.1/> 
PREFIX v:   <http://www.w3.org/2006/vcard/ns#> 
PREFIX vivo: <http://vivoweb.org/ontology/core#> 
PREFIX bibo: <http://purl.org/ontology/bibo/>

CONSTRUCT {
    ?vcard v:hasTitle _:title .
    _:title a v:Title .
    _:title v:title ?preferredTitle .
} WHERE {
     ?s <http://vivoweb.org/ontology/core#preferredTitle> ?preferredTitle .
     ?s arg:ARG_2000028 ?vcard .
     FILTER NOT EXISTS {
         ?vcard v:hasTitle ?title
     }
}