private function computeVarsCardinality()
 {
     $this->cardinality = array();
     $vars = $this->sdao->getVarsQty();
     for ($i = 0; $i < $vars; $i++) {
         $cardinality = 0;
         if ($this->sdao->getVarType($i) == "uVar") {
             $cardinality = User::getPropertyCardinality($this->sdao->getVarValue($i));
         } else {
             if ($this->sdao->getVarType($i) == "qVar") {
                 $cardinality = $this->computeQVarCardinality($this->sdao->getVarValue($i));
             }
         }
         $this->cardinality[$i] = $cardinality;
     }
 }