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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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#
# share with filter: triple bind values
#
prefix sp:  

template {
  ?suc 
}
where {
    
    ?q sp:resultVariables ?sel    
    ?sel rdf:rest*/rdf:first ?v
    ?v sp:varName ?n

    bind ( 
      exists { ?q sp:where/(! sp:void)+ ?b
      filter (st:call-template(st:bound, ?b, ?n)) }
    as ?bound) 
    
    bind (
      if (exists { ?v sp:expression ?e }, ! ?bound, ?bound)
    as ?suc)
    
    filter (st:visit(st:fail, ?v, ?suc))
}