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Corese is a Semantic Web Factory (triple store and SPARQL endpoint) implementing RDF, RDFS, SPARQL 1.1 Query and Update.

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template st:blank (?x, ?p, ?y) {

   if (bound(?t), 
     st:call-template(st:resourcetype, ?y, ?t),
     st:call-template(st:resource, ?y))

}
where {
   ?x ?p ?y
   optional {
        select ?y ?t where {
            ?y a ?t  filter (! isBlank(?t))
        } limit 1
     }
    filter st:visit(?y)
}