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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 {

  "{\"@id\": \""  str(?in)  "\"}"
  
}
where {
  ?x ?p ?in
  filter isBlank(?in)
  filter ( 
    not exists { ?in rdf:rest ?r } ||
	exists { ?y  rdf:first ?in }
  )
}
limit 1