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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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prefix sp:  

template {
  ?suc 
}
where {
    
    ?q sp:resultVariables ?sel    
    ?sel rdf:rest*/rdf:first ?v
    ?v sp:expression ?e 
    ?v sp:varName ?n
    ?sel rdf:rest*/rdf:first ?w
    ?w sp:varName ?n
    filter (?v != ?w)

    bind (false as ?suc)
    
    filter(st:visit(st:fail, ?v, ?suc))
      
}