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

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select * where {
  ?x a us:Test
  bind (us:surface(?x) as ?s)
}

function us:surface(?x) {
  let ((?w, ?l) = select * where { ?x us:width ?w ; us:length ?l }){
    ?w * ?l
  }
}

function xt:produce(?q){
    let ((?s, ?p, ?o) = ?q){
      if (?p = rdf:type){ xt:list(xt:triple(us:obj, rdf:type, us:Test))}
      else if (?p = us:width){ xt:list(xt:triple(us:obj, us:width, 2)) }
      else { xt:list(xt:triple(us:obj, us:length, 3)) }
    }
  }