System.out.println("visit(ExistExpression obj, Object arg)");
final ExistsContainer existsContainer = new ExistsContainer();
existsContainer.setVisualRifEditor(this.visualRifEditor);
existsContainer.draw(new GraphWrapperOperator(existsContainer),
(RuleGraph) arg);
final LinkedList<String> existsVar = new LinkedList<String>();
final Operator op = (Operator) obj